1 //===-- AArch64ISelLowering.cpp - AArch64 DAG Lowering Implementation ----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the AArch64TargetLowering class.
12 //===----------------------------------------------------------------------===//
14 #include "AArch64ISelLowering.h"
15 #include "AArch64PerfectShuffle.h"
16 #include "AArch64Subtarget.h"
17 #include "AArch64MachineFunctionInfo.h"
18 #include "AArch64TargetMachine.h"
19 #include "AArch64TargetObjectFile.h"
20 #include "MCTargetDesc/AArch64AddressingModes.h"
21 #include "llvm/ADT/Statistic.h"
22 #include "llvm/CodeGen/CallingConvLower.h"
23 #include "llvm/CodeGen/MachineFrameInfo.h"
24 #include "llvm/CodeGen/MachineInstrBuilder.h"
25 #include "llvm/CodeGen/MachineRegisterInfo.h"
26 #include "llvm/IR/Function.h"
27 #include "llvm/IR/Intrinsics.h"
28 #include "llvm/IR/Type.h"
29 #include "llvm/Support/CommandLine.h"
30 #include "llvm/Support/Debug.h"
31 #include "llvm/Support/ErrorHandling.h"
32 #include "llvm/Support/raw_ostream.h"
33 #include "llvm/Target/TargetOptions.h"
36 #define DEBUG_TYPE "aarch64-lower"
38 STATISTIC(NumTailCalls, "Number of tail calls");
39 STATISTIC(NumShiftInserts, "Number of vector shift inserts");
46 static cl::opt<AlignMode>
47 Align(cl::desc("Load/store alignment support"),
48 cl::Hidden, cl::init(NoStrictAlign),
50 clEnumValN(StrictAlign, "aarch64-strict-align",
51 "Disallow all unaligned memory accesses"),
52 clEnumValN(NoStrictAlign, "aarch64-no-strict-align",
53 "Allow unaligned memory accesses"),
56 // Place holder until extr generation is tested fully.
58 EnableAArch64ExtrGeneration("aarch64-extr-generation", cl::Hidden,
59 cl::desc("Allow AArch64 (or (shift)(shift))->extract"),
63 EnableAArch64SlrGeneration("aarch64-shift-insert-generation", cl::Hidden,
64 cl::desc("Allow AArch64 SLI/SRI formation"),
67 //===----------------------------------------------------------------------===//
68 // AArch64 Lowering public interface.
69 //===----------------------------------------------------------------------===//
70 static TargetLoweringObjectFile *createTLOF(const Triple &TT) {
71 if (TT.isOSBinFormatMachO())
72 return new AArch64_MachoTargetObjectFile();
74 return new AArch64_ELFTargetObjectFile();
77 AArch64TargetLowering::AArch64TargetLowering(TargetMachine &TM)
78 : TargetLowering(TM, createTLOF(Triple(TM.getTargetTriple()))) {
79 Subtarget = &TM.getSubtarget<AArch64Subtarget>();
81 // AArch64 doesn't have comparisons which set GPRs or setcc instructions, so
82 // we have to make something up. Arbitrarily, choose ZeroOrOne.
83 setBooleanContents(ZeroOrOneBooleanContent);
84 // When comparing vectors the result sets the different elements in the
85 // vector to all-one or all-zero.
86 setBooleanVectorContents(ZeroOrNegativeOneBooleanContent);
88 // Set up the register classes.
89 addRegisterClass(MVT::i32, &AArch64::GPR32allRegClass);
90 addRegisterClass(MVT::i64, &AArch64::GPR64allRegClass);
92 if (Subtarget->hasFPARMv8()) {
93 addRegisterClass(MVT::f16, &AArch64::FPR16RegClass);
94 addRegisterClass(MVT::f32, &AArch64::FPR32RegClass);
95 addRegisterClass(MVT::f64, &AArch64::FPR64RegClass);
96 addRegisterClass(MVT::f128, &AArch64::FPR128RegClass);
99 if (Subtarget->hasNEON()) {
100 addRegisterClass(MVT::v16i8, &AArch64::FPR8RegClass);
101 addRegisterClass(MVT::v8i16, &AArch64::FPR16RegClass);
102 // Someone set us up the NEON.
103 addDRTypeForNEON(MVT::v2f32);
104 addDRTypeForNEON(MVT::v8i8);
105 addDRTypeForNEON(MVT::v4i16);
106 addDRTypeForNEON(MVT::v2i32);
107 addDRTypeForNEON(MVT::v1i64);
108 addDRTypeForNEON(MVT::v1f64);
110 addQRTypeForNEON(MVT::v4f32);
111 addQRTypeForNEON(MVT::v2f64);
112 addQRTypeForNEON(MVT::v16i8);
113 addQRTypeForNEON(MVT::v8i16);
114 addQRTypeForNEON(MVT::v4i32);
115 addQRTypeForNEON(MVT::v2i64);
118 // Compute derived properties from the register classes
119 computeRegisterProperties();
121 // Provide all sorts of operation actions
122 setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
123 setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
124 setOperationAction(ISD::SETCC, MVT::i32, Custom);
125 setOperationAction(ISD::SETCC, MVT::i64, Custom);
126 setOperationAction(ISD::SETCC, MVT::f32, Custom);
127 setOperationAction(ISD::SETCC, MVT::f64, Custom);
128 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
129 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
130 setOperationAction(ISD::BR_CC, MVT::i64, Custom);
131 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
132 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
133 setOperationAction(ISD::SELECT, MVT::i32, Custom);
134 setOperationAction(ISD::SELECT, MVT::i64, Custom);
135 setOperationAction(ISD::SELECT, MVT::f32, Custom);
136 setOperationAction(ISD::SELECT, MVT::f64, Custom);
137 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
138 setOperationAction(ISD::SELECT_CC, MVT::i64, Custom);
139 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
140 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
141 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
142 setOperationAction(ISD::JumpTable, MVT::i64, Custom);
144 setOperationAction(ISD::SHL_PARTS, MVT::i64, Custom);
145 setOperationAction(ISD::SRA_PARTS, MVT::i64, Custom);
146 setOperationAction(ISD::SRL_PARTS, MVT::i64, Custom);
148 setOperationAction(ISD::FREM, MVT::f32, Expand);
149 setOperationAction(ISD::FREM, MVT::f64, Expand);
150 setOperationAction(ISD::FREM, MVT::f80, Expand);
152 // Custom lowering hooks are needed for XOR
153 // to fold it into CSINC/CSINV.
154 setOperationAction(ISD::XOR, MVT::i32, Custom);
155 setOperationAction(ISD::XOR, MVT::i64, Custom);
157 // Virtually no operation on f128 is legal, but LLVM can't expand them when
158 // there's a valid register class, so we need custom operations in most cases.
159 setOperationAction(ISD::FABS, MVT::f128, Expand);
160 setOperationAction(ISD::FADD, MVT::f128, Custom);
161 setOperationAction(ISD::FCOPYSIGN, MVT::f128, Expand);
162 setOperationAction(ISD::FCOS, MVT::f128, Expand);
163 setOperationAction(ISD::FDIV, MVT::f128, Custom);
164 setOperationAction(ISD::FMA, MVT::f128, Expand);
165 setOperationAction(ISD::FMUL, MVT::f128, Custom);
166 setOperationAction(ISD::FNEG, MVT::f128, Expand);
167 setOperationAction(ISD::FPOW, MVT::f128, Expand);
168 setOperationAction(ISD::FREM, MVT::f128, Expand);
169 setOperationAction(ISD::FRINT, MVT::f128, Expand);
170 setOperationAction(ISD::FSIN, MVT::f128, Expand);
171 setOperationAction(ISD::FSINCOS, MVT::f128, Expand);
172 setOperationAction(ISD::FSQRT, MVT::f128, Expand);
173 setOperationAction(ISD::FSUB, MVT::f128, Custom);
174 setOperationAction(ISD::FTRUNC, MVT::f128, Expand);
175 setOperationAction(ISD::SETCC, MVT::f128, Custom);
176 setOperationAction(ISD::BR_CC, MVT::f128, Custom);
177 setOperationAction(ISD::SELECT, MVT::f128, Custom);
178 setOperationAction(ISD::SELECT_CC, MVT::f128, Custom);
179 setOperationAction(ISD::FP_EXTEND, MVT::f128, Custom);
181 // Lowering for many of the conversions is actually specified by the non-f128
182 // type. The LowerXXX function will be trivial when f128 isn't involved.
183 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
184 setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
185 setOperationAction(ISD::FP_TO_SINT, MVT::i128, Custom);
186 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
187 setOperationAction(ISD::FP_TO_UINT, MVT::i64, Custom);
188 setOperationAction(ISD::FP_TO_UINT, MVT::i128, Custom);
189 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
190 setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
191 setOperationAction(ISD::SINT_TO_FP, MVT::i128, Custom);
192 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
193 setOperationAction(ISD::UINT_TO_FP, MVT::i64, Custom);
194 setOperationAction(ISD::UINT_TO_FP, MVT::i128, Custom);
195 setOperationAction(ISD::FP_ROUND, MVT::f32, Custom);
196 setOperationAction(ISD::FP_ROUND, MVT::f64, Custom);
198 // Variable arguments.
199 setOperationAction(ISD::VASTART, MVT::Other, Custom);
200 setOperationAction(ISD::VAARG, MVT::Other, Custom);
201 setOperationAction(ISD::VACOPY, MVT::Other, Custom);
202 setOperationAction(ISD::VAEND, MVT::Other, Expand);
204 // Variable-sized objects.
205 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
206 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
207 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
209 // Exception handling.
210 // FIXME: These are guesses. Has this been defined yet?
211 setExceptionPointerRegister(AArch64::X0);
212 setExceptionSelectorRegister(AArch64::X1);
214 // Constant pool entries
215 setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
218 setOperationAction(ISD::BlockAddress, MVT::i64, Custom);
220 // Add/Sub overflow ops with MVT::Glues are lowered to NZCV dependences.
221 setOperationAction(ISD::ADDC, MVT::i32, Custom);
222 setOperationAction(ISD::ADDE, MVT::i32, Custom);
223 setOperationAction(ISD::SUBC, MVT::i32, Custom);
224 setOperationAction(ISD::SUBE, MVT::i32, Custom);
225 setOperationAction(ISD::ADDC, MVT::i64, Custom);
226 setOperationAction(ISD::ADDE, MVT::i64, Custom);
227 setOperationAction(ISD::SUBC, MVT::i64, Custom);
228 setOperationAction(ISD::SUBE, MVT::i64, Custom);
230 // AArch64 lacks both left-rotate and popcount instructions.
231 setOperationAction(ISD::ROTL, MVT::i32, Expand);
232 setOperationAction(ISD::ROTL, MVT::i64, Expand);
234 // AArch64 doesn't have {U|S}MUL_LOHI.
235 setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
236 setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
239 // Expand the undefined-at-zero variants to cttz/ctlz to their defined-at-zero
240 // counterparts, which AArch64 supports directly.
241 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Expand);
242 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32, Expand);
243 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i64, Expand);
244 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i64, Expand);
246 setOperationAction(ISD::CTPOP, MVT::i32, Custom);
247 setOperationAction(ISD::CTPOP, MVT::i64, Custom);
249 setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
250 setOperationAction(ISD::SDIVREM, MVT::i64, Expand);
251 setOperationAction(ISD::SREM, MVT::i32, Expand);
252 setOperationAction(ISD::SREM, MVT::i64, Expand);
253 setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
254 setOperationAction(ISD::UDIVREM, MVT::i64, Expand);
255 setOperationAction(ISD::UREM, MVT::i32, Expand);
256 setOperationAction(ISD::UREM, MVT::i64, Expand);
258 // Custom lower Add/Sub/Mul with overflow.
259 setOperationAction(ISD::SADDO, MVT::i32, Custom);
260 setOperationAction(ISD::SADDO, MVT::i64, Custom);
261 setOperationAction(ISD::UADDO, MVT::i32, Custom);
262 setOperationAction(ISD::UADDO, MVT::i64, Custom);
263 setOperationAction(ISD::SSUBO, MVT::i32, Custom);
264 setOperationAction(ISD::SSUBO, MVT::i64, Custom);
265 setOperationAction(ISD::USUBO, MVT::i32, Custom);
266 setOperationAction(ISD::USUBO, MVT::i64, Custom);
267 setOperationAction(ISD::SMULO, MVT::i32, Custom);
268 setOperationAction(ISD::SMULO, MVT::i64, Custom);
269 setOperationAction(ISD::UMULO, MVT::i32, Custom);
270 setOperationAction(ISD::UMULO, MVT::i64, Custom);
272 setOperationAction(ISD::FSIN, MVT::f32, Expand);
273 setOperationAction(ISD::FSIN, MVT::f64, Expand);
274 setOperationAction(ISD::FCOS, MVT::f32, Expand);
275 setOperationAction(ISD::FCOS, MVT::f64, Expand);
276 setOperationAction(ISD::FPOW, MVT::f32, Expand);
277 setOperationAction(ISD::FPOW, MVT::f64, Expand);
278 setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
279 setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
281 // AArch64 has implementations of a lot of rounding-like FP operations.
282 static MVT RoundingTypes[] = { MVT::f32, MVT::f64};
283 for (unsigned I = 0; I < array_lengthof(RoundingTypes); ++I) {
284 MVT Ty = RoundingTypes[I];
285 setOperationAction(ISD::FFLOOR, Ty, Legal);
286 setOperationAction(ISD::FNEARBYINT, Ty, Legal);
287 setOperationAction(ISD::FCEIL, Ty, Legal);
288 setOperationAction(ISD::FRINT, Ty, Legal);
289 setOperationAction(ISD::FTRUNC, Ty, Legal);
290 setOperationAction(ISD::FROUND, Ty, Legal);
293 setOperationAction(ISD::PREFETCH, MVT::Other, Custom);
295 if (Subtarget->isTargetMachO()) {
296 // For iOS, we don't want to the normal expansion of a libcall to
297 // sincos. We want to issue a libcall to __sincos_stret to avoid memory
299 setOperationAction(ISD::FSINCOS, MVT::f64, Custom);
300 setOperationAction(ISD::FSINCOS, MVT::f32, Custom);
302 setOperationAction(ISD::FSINCOS, MVT::f64, Expand);
303 setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
306 // AArch64 does not have floating-point extending loads, i1 sign-extending
307 // load, floating-point truncating stores, or v2i32->v2i16 truncating store.
308 setLoadExtAction(ISD::EXTLOAD, MVT::f16, Expand);
309 setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
310 setLoadExtAction(ISD::EXTLOAD, MVT::f64, Expand);
311 setLoadExtAction(ISD::EXTLOAD, MVT::f80, Expand);
312 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Expand);
313 setTruncStoreAction(MVT::f32, MVT::f16, Expand);
314 setTruncStoreAction(MVT::f64, MVT::f32, Expand);
315 setTruncStoreAction(MVT::f64, MVT::f16, Expand);
316 setTruncStoreAction(MVT::f128, MVT::f80, Expand);
317 setTruncStoreAction(MVT::f128, MVT::f64, Expand);
318 setTruncStoreAction(MVT::f128, MVT::f32, Expand);
319 setTruncStoreAction(MVT::f128, MVT::f16, Expand);
321 setOperationAction(ISD::BITCAST, MVT::i16, Custom);
322 setOperationAction(ISD::BITCAST, MVT::f16, Custom);
324 // Indexed loads and stores are supported.
325 for (unsigned im = (unsigned)ISD::PRE_INC;
326 im != (unsigned)ISD::LAST_INDEXED_MODE; ++im) {
327 setIndexedLoadAction(im, MVT::i8, Legal);
328 setIndexedLoadAction(im, MVT::i16, Legal);
329 setIndexedLoadAction(im, MVT::i32, Legal);
330 setIndexedLoadAction(im, MVT::i64, Legal);
331 setIndexedLoadAction(im, MVT::f64, Legal);
332 setIndexedLoadAction(im, MVT::f32, Legal);
333 setIndexedStoreAction(im, MVT::i8, Legal);
334 setIndexedStoreAction(im, MVT::i16, Legal);
335 setIndexedStoreAction(im, MVT::i32, Legal);
336 setIndexedStoreAction(im, MVT::i64, Legal);
337 setIndexedStoreAction(im, MVT::f64, Legal);
338 setIndexedStoreAction(im, MVT::f32, Legal);
342 setOperationAction(ISD::TRAP, MVT::Other, Legal);
344 // We combine OR nodes for bitfield operations.
345 setTargetDAGCombine(ISD::OR);
347 // Vector add and sub nodes may conceal a high-half opportunity.
348 // Also, try to fold ADD into CSINC/CSINV..
349 setTargetDAGCombine(ISD::ADD);
350 setTargetDAGCombine(ISD::SUB);
352 setTargetDAGCombine(ISD::XOR);
353 setTargetDAGCombine(ISD::SINT_TO_FP);
354 setTargetDAGCombine(ISD::UINT_TO_FP);
356 setTargetDAGCombine(ISD::INTRINSIC_WO_CHAIN);
358 setTargetDAGCombine(ISD::ANY_EXTEND);
359 setTargetDAGCombine(ISD::ZERO_EXTEND);
360 setTargetDAGCombine(ISD::SIGN_EXTEND);
361 setTargetDAGCombine(ISD::BITCAST);
362 setTargetDAGCombine(ISD::CONCAT_VECTORS);
363 setTargetDAGCombine(ISD::STORE);
365 setTargetDAGCombine(ISD::MUL);
367 setTargetDAGCombine(ISD::SELECT);
368 setTargetDAGCombine(ISD::VSELECT);
370 setTargetDAGCombine(ISD::INTRINSIC_VOID);
371 setTargetDAGCombine(ISD::INTRINSIC_W_CHAIN);
372 setTargetDAGCombine(ISD::INSERT_VECTOR_ELT);
374 MaxStoresPerMemset = MaxStoresPerMemsetOptSize = 8;
375 MaxStoresPerMemcpy = MaxStoresPerMemcpyOptSize = 4;
376 MaxStoresPerMemmove = MaxStoresPerMemmoveOptSize = 4;
378 setStackPointerRegisterToSaveRestore(AArch64::SP);
380 setSchedulingPreference(Sched::Hybrid);
383 MaskAndBranchFoldingIsLegal = true;
385 setMinFunctionAlignment(2);
387 RequireStrictAlign = (Align == StrictAlign);
389 setHasExtractBitsInsn(true);
391 if (Subtarget->hasNEON()) {
392 // FIXME: v1f64 shouldn't be legal if we can avoid it, because it leads to
393 // silliness like this:
394 setOperationAction(ISD::FABS, MVT::v1f64, Expand);
395 setOperationAction(ISD::FADD, MVT::v1f64, Expand);
396 setOperationAction(ISD::FCEIL, MVT::v1f64, Expand);
397 setOperationAction(ISD::FCOPYSIGN, MVT::v1f64, Expand);
398 setOperationAction(ISD::FCOS, MVT::v1f64, Expand);
399 setOperationAction(ISD::FDIV, MVT::v1f64, Expand);
400 setOperationAction(ISD::FFLOOR, MVT::v1f64, Expand);
401 setOperationAction(ISD::FMA, MVT::v1f64, Expand);
402 setOperationAction(ISD::FMUL, MVT::v1f64, Expand);
403 setOperationAction(ISD::FNEARBYINT, MVT::v1f64, Expand);
404 setOperationAction(ISD::FNEG, MVT::v1f64, Expand);
405 setOperationAction(ISD::FPOW, MVT::v1f64, Expand);
406 setOperationAction(ISD::FREM, MVT::v1f64, Expand);
407 setOperationAction(ISD::FROUND, MVT::v1f64, Expand);
408 setOperationAction(ISD::FRINT, MVT::v1f64, Expand);
409 setOperationAction(ISD::FSIN, MVT::v1f64, Expand);
410 setOperationAction(ISD::FSINCOS, MVT::v1f64, Expand);
411 setOperationAction(ISD::FSQRT, MVT::v1f64, Expand);
412 setOperationAction(ISD::FSUB, MVT::v1f64, Expand);
413 setOperationAction(ISD::FTRUNC, MVT::v1f64, Expand);
414 setOperationAction(ISD::SETCC, MVT::v1f64, Expand);
415 setOperationAction(ISD::BR_CC, MVT::v1f64, Expand);
416 setOperationAction(ISD::SELECT, MVT::v1f64, Expand);
417 setOperationAction(ISD::SELECT_CC, MVT::v1f64, Expand);
418 setOperationAction(ISD::FP_EXTEND, MVT::v1f64, Expand);
420 setOperationAction(ISD::FP_TO_SINT, MVT::v1i64, Expand);
421 setOperationAction(ISD::FP_TO_UINT, MVT::v1i64, Expand);
422 setOperationAction(ISD::SINT_TO_FP, MVT::v1i64, Expand);
423 setOperationAction(ISD::UINT_TO_FP, MVT::v1i64, Expand);
424 setOperationAction(ISD::FP_ROUND, MVT::v1f64, Expand);
426 setOperationAction(ISD::MUL, MVT::v1i64, Expand);
428 // AArch64 doesn't have a direct vector ->f32 conversion instructions for
429 // elements smaller than i32, so promote the input to i32 first.
430 setOperationAction(ISD::UINT_TO_FP, MVT::v4i8, Promote);
431 setOperationAction(ISD::SINT_TO_FP, MVT::v4i8, Promote);
432 setOperationAction(ISD::UINT_TO_FP, MVT::v4i16, Promote);
433 setOperationAction(ISD::SINT_TO_FP, MVT::v4i16, Promote);
434 // Similarly, there is no direct i32 -> f64 vector conversion instruction.
435 setOperationAction(ISD::SINT_TO_FP, MVT::v2i32, Custom);
436 setOperationAction(ISD::UINT_TO_FP, MVT::v2i32, Custom);
437 setOperationAction(ISD::SINT_TO_FP, MVT::v2i64, Custom);
438 setOperationAction(ISD::UINT_TO_FP, MVT::v2i64, Custom);
440 // AArch64 doesn't have MUL.2d:
441 setOperationAction(ISD::MUL, MVT::v2i64, Expand);
442 setOperationAction(ISD::ANY_EXTEND, MVT::v4i32, Legal);
443 setTruncStoreAction(MVT::v2i32, MVT::v2i16, Expand);
444 // Likewise, narrowing and extending vector loads/stores aren't handled
446 for (unsigned VT = (unsigned)MVT::FIRST_VECTOR_VALUETYPE;
447 VT <= (unsigned)MVT::LAST_VECTOR_VALUETYPE; ++VT) {
449 setOperationAction(ISD::SIGN_EXTEND_INREG, (MVT::SimpleValueType)VT,
452 setOperationAction(ISD::MULHS, (MVT::SimpleValueType)VT, Expand);
453 setOperationAction(ISD::SMUL_LOHI, (MVT::SimpleValueType)VT, Expand);
454 setOperationAction(ISD::MULHU, (MVT::SimpleValueType)VT, Expand);
455 setOperationAction(ISD::UMUL_LOHI, (MVT::SimpleValueType)VT, Expand);
457 setOperationAction(ISD::BSWAP, (MVT::SimpleValueType)VT, Expand);
459 for (unsigned InnerVT = (unsigned)MVT::FIRST_VECTOR_VALUETYPE;
460 InnerVT <= (unsigned)MVT::LAST_VECTOR_VALUETYPE; ++InnerVT)
461 setTruncStoreAction((MVT::SimpleValueType)VT,
462 (MVT::SimpleValueType)InnerVT, Expand);
463 setLoadExtAction(ISD::SEXTLOAD, (MVT::SimpleValueType)VT, Expand);
464 setLoadExtAction(ISD::ZEXTLOAD, (MVT::SimpleValueType)VT, Expand);
465 setLoadExtAction(ISD::EXTLOAD, (MVT::SimpleValueType)VT, Expand);
468 // AArch64 has implementations of a lot of rounding-like FP operations.
469 static MVT RoundingVecTypes[] = {MVT::v2f32, MVT::v4f32, MVT::v2f64 };
470 for (unsigned I = 0; I < array_lengthof(RoundingVecTypes); ++I) {
471 MVT Ty = RoundingVecTypes[I];
472 setOperationAction(ISD::FFLOOR, Ty, Legal);
473 setOperationAction(ISD::FNEARBYINT, Ty, Legal);
474 setOperationAction(ISD::FCEIL, Ty, Legal);
475 setOperationAction(ISD::FRINT, Ty, Legal);
476 setOperationAction(ISD::FTRUNC, Ty, Legal);
477 setOperationAction(ISD::FROUND, Ty, Legal);
482 void AArch64TargetLowering::addTypeForNEON(EVT VT, EVT PromotedBitwiseVT) {
483 if (VT == MVT::v2f32) {
484 setOperationAction(ISD::LOAD, VT.getSimpleVT(), Promote);
485 AddPromotedToType(ISD::LOAD, VT.getSimpleVT(), MVT::v2i32);
487 setOperationAction(ISD::STORE, VT.getSimpleVT(), Promote);
488 AddPromotedToType(ISD::STORE, VT.getSimpleVT(), MVT::v2i32);
489 } else if (VT == MVT::v2f64 || VT == MVT::v4f32) {
490 setOperationAction(ISD::LOAD, VT.getSimpleVT(), Promote);
491 AddPromotedToType(ISD::LOAD, VT.getSimpleVT(), MVT::v2i64);
493 setOperationAction(ISD::STORE, VT.getSimpleVT(), Promote);
494 AddPromotedToType(ISD::STORE, VT.getSimpleVT(), MVT::v2i64);
497 // Mark vector float intrinsics as expand.
498 if (VT == MVT::v2f32 || VT == MVT::v4f32 || VT == MVT::v2f64) {
499 setOperationAction(ISD::FSIN, VT.getSimpleVT(), Expand);
500 setOperationAction(ISD::FCOS, VT.getSimpleVT(), Expand);
501 setOperationAction(ISD::FPOWI, VT.getSimpleVT(), Expand);
502 setOperationAction(ISD::FPOW, VT.getSimpleVT(), Expand);
503 setOperationAction(ISD::FLOG, VT.getSimpleVT(), Expand);
504 setOperationAction(ISD::FLOG2, VT.getSimpleVT(), Expand);
505 setOperationAction(ISD::FLOG10, VT.getSimpleVT(), Expand);
506 setOperationAction(ISD::FEXP, VT.getSimpleVT(), Expand);
507 setOperationAction(ISD::FEXP2, VT.getSimpleVT(), Expand);
510 setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT.getSimpleVT(), Custom);
511 setOperationAction(ISD::INSERT_VECTOR_ELT, VT.getSimpleVT(), Custom);
512 setOperationAction(ISD::BUILD_VECTOR, VT.getSimpleVT(), Custom);
513 setOperationAction(ISD::VECTOR_SHUFFLE, VT.getSimpleVT(), Custom);
514 setOperationAction(ISD::EXTRACT_SUBVECTOR, VT.getSimpleVT(), Custom);
515 setOperationAction(ISD::SRA, VT.getSimpleVT(), Custom);
516 setOperationAction(ISD::SRL, VT.getSimpleVT(), Custom);
517 setOperationAction(ISD::SHL, VT.getSimpleVT(), Custom);
518 setOperationAction(ISD::AND, VT.getSimpleVT(), Custom);
519 setOperationAction(ISD::OR, VT.getSimpleVT(), Custom);
520 setOperationAction(ISD::SETCC, VT.getSimpleVT(), Custom);
521 setOperationAction(ISD::CONCAT_VECTORS, VT.getSimpleVT(), Legal);
523 setOperationAction(ISD::SELECT, VT.getSimpleVT(), Expand);
524 setOperationAction(ISD::SELECT_CC, VT.getSimpleVT(), Expand);
525 setOperationAction(ISD::VSELECT, VT.getSimpleVT(), Expand);
526 setLoadExtAction(ISD::EXTLOAD, VT.getSimpleVT(), Expand);
528 // CNT supports only B element sizes.
529 if (VT != MVT::v8i8 && VT != MVT::v16i8)
530 setOperationAction(ISD::CTPOP, VT.getSimpleVT(), Expand);
532 setOperationAction(ISD::UDIV, VT.getSimpleVT(), Expand);
533 setOperationAction(ISD::SDIV, VT.getSimpleVT(), Expand);
534 setOperationAction(ISD::UREM, VT.getSimpleVT(), Expand);
535 setOperationAction(ISD::SREM, VT.getSimpleVT(), Expand);
536 setOperationAction(ISD::FREM, VT.getSimpleVT(), Expand);
538 setOperationAction(ISD::FP_TO_SINT, VT.getSimpleVT(), Custom);
539 setOperationAction(ISD::FP_TO_UINT, VT.getSimpleVT(), Custom);
541 if (Subtarget->isLittleEndian()) {
542 for (unsigned im = (unsigned)ISD::PRE_INC;
543 im != (unsigned)ISD::LAST_INDEXED_MODE; ++im) {
544 setIndexedLoadAction(im, VT.getSimpleVT(), Legal);
545 setIndexedStoreAction(im, VT.getSimpleVT(), Legal);
550 void AArch64TargetLowering::addDRTypeForNEON(MVT VT) {
551 addRegisterClass(VT, &AArch64::FPR64RegClass);
552 addTypeForNEON(VT, MVT::v2i32);
555 void AArch64TargetLowering::addQRTypeForNEON(MVT VT) {
556 addRegisterClass(VT, &AArch64::FPR128RegClass);
557 addTypeForNEON(VT, MVT::v4i32);
560 EVT AArch64TargetLowering::getSetCCResultType(LLVMContext &, EVT VT) const {
563 return VT.changeVectorElementTypeToInteger();
566 /// computeKnownBitsForTargetNode - Determine which of the bits specified in
567 /// Mask are known to be either zero or one and return them in the
568 /// KnownZero/KnownOne bitsets.
569 void AArch64TargetLowering::computeKnownBitsForTargetNode(
570 const SDValue Op, APInt &KnownZero, APInt &KnownOne,
571 const SelectionDAG &DAG, unsigned Depth) const {
572 switch (Op.getOpcode()) {
575 case AArch64ISD::CSEL: {
576 APInt KnownZero2, KnownOne2;
577 DAG.computeKnownBits(Op->getOperand(0), KnownZero, KnownOne, Depth + 1);
578 DAG.computeKnownBits(Op->getOperand(1), KnownZero2, KnownOne2, Depth + 1);
579 KnownZero &= KnownZero2;
580 KnownOne &= KnownOne2;
583 case ISD::INTRINSIC_W_CHAIN: {
584 ConstantSDNode *CN = cast<ConstantSDNode>(Op->getOperand(1));
585 Intrinsic::ID IntID = static_cast<Intrinsic::ID>(CN->getZExtValue());
588 case Intrinsic::aarch64_ldaxr:
589 case Intrinsic::aarch64_ldxr: {
590 unsigned BitWidth = KnownOne.getBitWidth();
591 EVT VT = cast<MemIntrinsicSDNode>(Op)->getMemoryVT();
592 unsigned MemBits = VT.getScalarType().getSizeInBits();
593 KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - MemBits);
599 case ISD::INTRINSIC_WO_CHAIN:
600 case ISD::INTRINSIC_VOID: {
601 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
605 case Intrinsic::aarch64_neon_umaxv:
606 case Intrinsic::aarch64_neon_uminv: {
607 // Figure out the datatype of the vector operand. The UMINV instruction
608 // will zero extend the result, so we can mark as known zero all the
609 // bits larger than the element datatype. 32-bit or larget doesn't need
610 // this as those are legal types and will be handled by isel directly.
611 MVT VT = Op.getOperand(1).getValueType().getSimpleVT();
612 unsigned BitWidth = KnownZero.getBitWidth();
613 if (VT == MVT::v8i8 || VT == MVT::v16i8) {
614 assert(BitWidth >= 8 && "Unexpected width!");
615 APInt Mask = APInt::getHighBitsSet(BitWidth, BitWidth - 8);
617 } else if (VT == MVT::v4i16 || VT == MVT::v8i16) {
618 assert(BitWidth >= 16 && "Unexpected width!");
619 APInt Mask = APInt::getHighBitsSet(BitWidth, BitWidth - 16);
629 MVT AArch64TargetLowering::getScalarShiftAmountTy(EVT LHSTy) const {
633 unsigned AArch64TargetLowering::getMaximalGlobalOffset() const {
634 // FIXME: On AArch64, this depends on the type.
635 // Basically, the addressable offsets are up to 4095 * Ty.getSizeInBytes().
636 // and the offset has to be a multiple of the related size in bytes.
641 AArch64TargetLowering::createFastISel(FunctionLoweringInfo &funcInfo,
642 const TargetLibraryInfo *libInfo) const {
643 return AArch64::createFastISel(funcInfo, libInfo);
646 const char *AArch64TargetLowering::getTargetNodeName(unsigned Opcode) const {
650 case AArch64ISD::CALL: return "AArch64ISD::CALL";
651 case AArch64ISD::ADRP: return "AArch64ISD::ADRP";
652 case AArch64ISD::ADDlow: return "AArch64ISD::ADDlow";
653 case AArch64ISD::LOADgot: return "AArch64ISD::LOADgot";
654 case AArch64ISD::RET_FLAG: return "AArch64ISD::RET_FLAG";
655 case AArch64ISD::BRCOND: return "AArch64ISD::BRCOND";
656 case AArch64ISD::CSEL: return "AArch64ISD::CSEL";
657 case AArch64ISD::FCSEL: return "AArch64ISD::FCSEL";
658 case AArch64ISD::CSINV: return "AArch64ISD::CSINV";
659 case AArch64ISD::CSNEG: return "AArch64ISD::CSNEG";
660 case AArch64ISD::CSINC: return "AArch64ISD::CSINC";
661 case AArch64ISD::THREAD_POINTER: return "AArch64ISD::THREAD_POINTER";
662 case AArch64ISD::TLSDESC_CALL: return "AArch64ISD::TLSDESC_CALL";
663 case AArch64ISD::ADC: return "AArch64ISD::ADC";
664 case AArch64ISD::SBC: return "AArch64ISD::SBC";
665 case AArch64ISD::ADDS: return "AArch64ISD::ADDS";
666 case AArch64ISD::SUBS: return "AArch64ISD::SUBS";
667 case AArch64ISD::ADCS: return "AArch64ISD::ADCS";
668 case AArch64ISD::SBCS: return "AArch64ISD::SBCS";
669 case AArch64ISD::ANDS: return "AArch64ISD::ANDS";
670 case AArch64ISD::FCMP: return "AArch64ISD::FCMP";
671 case AArch64ISD::FMIN: return "AArch64ISD::FMIN";
672 case AArch64ISD::FMAX: return "AArch64ISD::FMAX";
673 case AArch64ISD::DUP: return "AArch64ISD::DUP";
674 case AArch64ISD::DUPLANE8: return "AArch64ISD::DUPLANE8";
675 case AArch64ISD::DUPLANE16: return "AArch64ISD::DUPLANE16";
676 case AArch64ISD::DUPLANE32: return "AArch64ISD::DUPLANE32";
677 case AArch64ISD::DUPLANE64: return "AArch64ISD::DUPLANE64";
678 case AArch64ISD::MOVI: return "AArch64ISD::MOVI";
679 case AArch64ISD::MOVIshift: return "AArch64ISD::MOVIshift";
680 case AArch64ISD::MOVIedit: return "AArch64ISD::MOVIedit";
681 case AArch64ISD::MOVImsl: return "AArch64ISD::MOVImsl";
682 case AArch64ISD::FMOV: return "AArch64ISD::FMOV";
683 case AArch64ISD::MVNIshift: return "AArch64ISD::MVNIshift";
684 case AArch64ISD::MVNImsl: return "AArch64ISD::MVNImsl";
685 case AArch64ISD::BICi: return "AArch64ISD::BICi";
686 case AArch64ISD::ORRi: return "AArch64ISD::ORRi";
687 case AArch64ISD::BSL: return "AArch64ISD::BSL";
688 case AArch64ISD::NEG: return "AArch64ISD::NEG";
689 case AArch64ISD::EXTR: return "AArch64ISD::EXTR";
690 case AArch64ISD::ZIP1: return "AArch64ISD::ZIP1";
691 case AArch64ISD::ZIP2: return "AArch64ISD::ZIP2";
692 case AArch64ISD::UZP1: return "AArch64ISD::UZP1";
693 case AArch64ISD::UZP2: return "AArch64ISD::UZP2";
694 case AArch64ISD::TRN1: return "AArch64ISD::TRN1";
695 case AArch64ISD::TRN2: return "AArch64ISD::TRN2";
696 case AArch64ISD::REV16: return "AArch64ISD::REV16";
697 case AArch64ISD::REV32: return "AArch64ISD::REV32";
698 case AArch64ISD::REV64: return "AArch64ISD::REV64";
699 case AArch64ISD::EXT: return "AArch64ISD::EXT";
700 case AArch64ISD::VSHL: return "AArch64ISD::VSHL";
701 case AArch64ISD::VLSHR: return "AArch64ISD::VLSHR";
702 case AArch64ISD::VASHR: return "AArch64ISD::VASHR";
703 case AArch64ISD::CMEQ: return "AArch64ISD::CMEQ";
704 case AArch64ISD::CMGE: return "AArch64ISD::CMGE";
705 case AArch64ISD::CMGT: return "AArch64ISD::CMGT";
706 case AArch64ISD::CMHI: return "AArch64ISD::CMHI";
707 case AArch64ISD::CMHS: return "AArch64ISD::CMHS";
708 case AArch64ISD::FCMEQ: return "AArch64ISD::FCMEQ";
709 case AArch64ISD::FCMGE: return "AArch64ISD::FCMGE";
710 case AArch64ISD::FCMGT: return "AArch64ISD::FCMGT";
711 case AArch64ISD::CMEQz: return "AArch64ISD::CMEQz";
712 case AArch64ISD::CMGEz: return "AArch64ISD::CMGEz";
713 case AArch64ISD::CMGTz: return "AArch64ISD::CMGTz";
714 case AArch64ISD::CMLEz: return "AArch64ISD::CMLEz";
715 case AArch64ISD::CMLTz: return "AArch64ISD::CMLTz";
716 case AArch64ISD::FCMEQz: return "AArch64ISD::FCMEQz";
717 case AArch64ISD::FCMGEz: return "AArch64ISD::FCMGEz";
718 case AArch64ISD::FCMGTz: return "AArch64ISD::FCMGTz";
719 case AArch64ISD::FCMLEz: return "AArch64ISD::FCMLEz";
720 case AArch64ISD::FCMLTz: return "AArch64ISD::FCMLTz";
721 case AArch64ISD::NOT: return "AArch64ISD::NOT";
722 case AArch64ISD::BIT: return "AArch64ISD::BIT";
723 case AArch64ISD::CBZ: return "AArch64ISD::CBZ";
724 case AArch64ISD::CBNZ: return "AArch64ISD::CBNZ";
725 case AArch64ISD::TBZ: return "AArch64ISD::TBZ";
726 case AArch64ISD::TBNZ: return "AArch64ISD::TBNZ";
727 case AArch64ISD::TC_RETURN: return "AArch64ISD::TC_RETURN";
728 case AArch64ISD::SITOF: return "AArch64ISD::SITOF";
729 case AArch64ISD::UITOF: return "AArch64ISD::UITOF";
730 case AArch64ISD::SQSHL_I: return "AArch64ISD::SQSHL_I";
731 case AArch64ISD::UQSHL_I: return "AArch64ISD::UQSHL_I";
732 case AArch64ISD::SRSHR_I: return "AArch64ISD::SRSHR_I";
733 case AArch64ISD::URSHR_I: return "AArch64ISD::URSHR_I";
734 case AArch64ISD::SQSHLU_I: return "AArch64ISD::SQSHLU_I";
735 case AArch64ISD::WrapperLarge: return "AArch64ISD::WrapperLarge";
736 case AArch64ISD::LD2post: return "AArch64ISD::LD2post";
737 case AArch64ISD::LD3post: return "AArch64ISD::LD3post";
738 case AArch64ISD::LD4post: return "AArch64ISD::LD4post";
739 case AArch64ISD::ST2post: return "AArch64ISD::ST2post";
740 case AArch64ISD::ST3post: return "AArch64ISD::ST3post";
741 case AArch64ISD::ST4post: return "AArch64ISD::ST4post";
742 case AArch64ISD::LD1x2post: return "AArch64ISD::LD1x2post";
743 case AArch64ISD::LD1x3post: return "AArch64ISD::LD1x3post";
744 case AArch64ISD::LD1x4post: return "AArch64ISD::LD1x4post";
745 case AArch64ISD::ST1x2post: return "AArch64ISD::ST1x2post";
746 case AArch64ISD::ST1x3post: return "AArch64ISD::ST1x3post";
747 case AArch64ISD::ST1x4post: return "AArch64ISD::ST1x4post";
748 case AArch64ISD::LD1DUPpost: return "AArch64ISD::LD1DUPpost";
749 case AArch64ISD::LD2DUPpost: return "AArch64ISD::LD2DUPpost";
750 case AArch64ISD::LD3DUPpost: return "AArch64ISD::LD3DUPpost";
751 case AArch64ISD::LD4DUPpost: return "AArch64ISD::LD4DUPpost";
752 case AArch64ISD::LD1LANEpost: return "AArch64ISD::LD1LANEpost";
753 case AArch64ISD::LD2LANEpost: return "AArch64ISD::LD2LANEpost";
754 case AArch64ISD::LD3LANEpost: return "AArch64ISD::LD3LANEpost";
755 case AArch64ISD::LD4LANEpost: return "AArch64ISD::LD4LANEpost";
756 case AArch64ISD::ST2LANEpost: return "AArch64ISD::ST2LANEpost";
757 case AArch64ISD::ST3LANEpost: return "AArch64ISD::ST3LANEpost";
758 case AArch64ISD::ST4LANEpost: return "AArch64ISD::ST4LANEpost";
763 AArch64TargetLowering::EmitF128CSEL(MachineInstr *MI,
764 MachineBasicBlock *MBB) const {
765 // We materialise the F128CSEL pseudo-instruction as some control flow and a
769 // [... previous instrs leading to comparison ...]
775 // Dest = PHI [IfTrue, TrueBB], [IfFalse, OrigBB]
777 const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
778 MachineFunction *MF = MBB->getParent();
779 const BasicBlock *LLVM_BB = MBB->getBasicBlock();
780 DebugLoc DL = MI->getDebugLoc();
781 MachineFunction::iterator It = MBB;
784 unsigned DestReg = MI->getOperand(0).getReg();
785 unsigned IfTrueReg = MI->getOperand(1).getReg();
786 unsigned IfFalseReg = MI->getOperand(2).getReg();
787 unsigned CondCode = MI->getOperand(3).getImm();
788 bool NZCVKilled = MI->getOperand(4).isKill();
790 MachineBasicBlock *TrueBB = MF->CreateMachineBasicBlock(LLVM_BB);
791 MachineBasicBlock *EndBB = MF->CreateMachineBasicBlock(LLVM_BB);
792 MF->insert(It, TrueBB);
793 MF->insert(It, EndBB);
795 // Transfer rest of current basic-block to EndBB
796 EndBB->splice(EndBB->begin(), MBB, std::next(MachineBasicBlock::iterator(MI)),
798 EndBB->transferSuccessorsAndUpdatePHIs(MBB);
800 BuildMI(MBB, DL, TII->get(AArch64::Bcc)).addImm(CondCode).addMBB(TrueBB);
801 BuildMI(MBB, DL, TII->get(AArch64::B)).addMBB(EndBB);
802 MBB->addSuccessor(TrueBB);
803 MBB->addSuccessor(EndBB);
805 // TrueBB falls through to the end.
806 TrueBB->addSuccessor(EndBB);
809 TrueBB->addLiveIn(AArch64::NZCV);
810 EndBB->addLiveIn(AArch64::NZCV);
813 BuildMI(*EndBB, EndBB->begin(), DL, TII->get(AArch64::PHI), DestReg)
819 MI->eraseFromParent();
824 AArch64TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
825 MachineBasicBlock *BB) const {
826 switch (MI->getOpcode()) {
831 llvm_unreachable("Unexpected instruction for custom inserter!");
833 case AArch64::F128CSEL:
834 return EmitF128CSEL(MI, BB);
836 case TargetOpcode::STACKMAP:
837 case TargetOpcode::PATCHPOINT:
838 return emitPatchPoint(MI, BB);
842 //===----------------------------------------------------------------------===//
843 // AArch64 Lowering private implementation.
844 //===----------------------------------------------------------------------===//
846 //===----------------------------------------------------------------------===//
848 //===----------------------------------------------------------------------===//
850 /// changeIntCCToAArch64CC - Convert a DAG integer condition code to an AArch64
852 static AArch64CC::CondCode changeIntCCToAArch64CC(ISD::CondCode CC) {
855 llvm_unreachable("Unknown condition code!");
857 return AArch64CC::NE;
859 return AArch64CC::EQ;
861 return AArch64CC::GT;
863 return AArch64CC::GE;
865 return AArch64CC::LT;
867 return AArch64CC::LE;
869 return AArch64CC::HI;
871 return AArch64CC::HS;
873 return AArch64CC::LO;
875 return AArch64CC::LS;
879 /// changeFPCCToAArch64CC - Convert a DAG fp condition code to an AArch64 CC.
880 static void changeFPCCToAArch64CC(ISD::CondCode CC,
881 AArch64CC::CondCode &CondCode,
882 AArch64CC::CondCode &CondCode2) {
883 CondCode2 = AArch64CC::AL;
886 llvm_unreachable("Unknown FP condition!");
889 CondCode = AArch64CC::EQ;
893 CondCode = AArch64CC::GT;
897 CondCode = AArch64CC::GE;
900 CondCode = AArch64CC::MI;
903 CondCode = AArch64CC::LS;
906 CondCode = AArch64CC::MI;
907 CondCode2 = AArch64CC::GT;
910 CondCode = AArch64CC::VC;
913 CondCode = AArch64CC::VS;
916 CondCode = AArch64CC::EQ;
917 CondCode2 = AArch64CC::VS;
920 CondCode = AArch64CC::HI;
923 CondCode = AArch64CC::PL;
927 CondCode = AArch64CC::LT;
931 CondCode = AArch64CC::LE;
935 CondCode = AArch64CC::NE;
940 /// changeVectorFPCCToAArch64CC - Convert a DAG fp condition code to an AArch64
941 /// CC usable with the vector instructions. Fewer operations are available
942 /// without a real NZCV register, so we have to use less efficient combinations
943 /// to get the same effect.
944 static void changeVectorFPCCToAArch64CC(ISD::CondCode CC,
945 AArch64CC::CondCode &CondCode,
946 AArch64CC::CondCode &CondCode2,
951 // Mostly the scalar mappings work fine.
952 changeFPCCToAArch64CC(CC, CondCode, CondCode2);
955 Invert = true; // Fallthrough
957 CondCode = AArch64CC::MI;
958 CondCode2 = AArch64CC::GE;
965 // All of the compare-mask comparisons are ordered, but we can switch
966 // between the two by a double inversion. E.g. ULE == !OGT.
968 changeFPCCToAArch64CC(getSetCCInverse(CC, false), CondCode, CondCode2);
973 static bool isLegalArithImmed(uint64_t C) {
974 // Matches AArch64DAGToDAGISel::SelectArithImmed().
975 return (C >> 12 == 0) || ((C & 0xFFFULL) == 0 && C >> 24 == 0);
978 static SDValue emitComparison(SDValue LHS, SDValue RHS, ISD::CondCode CC,
979 SDLoc dl, SelectionDAG &DAG) {
980 EVT VT = LHS.getValueType();
982 if (VT.isFloatingPoint())
983 return DAG.getNode(AArch64ISD::FCMP, dl, VT, LHS, RHS);
985 // The CMP instruction is just an alias for SUBS, and representing it as
986 // SUBS means that it's possible to get CSE with subtract operations.
987 // A later phase can perform the optimization of setting the destination
988 // register to WZR/XZR if it ends up being unused.
989 unsigned Opcode = AArch64ISD::SUBS;
991 if (RHS.getOpcode() == ISD::SUB && isa<ConstantSDNode>(RHS.getOperand(0)) &&
992 cast<ConstantSDNode>(RHS.getOperand(0))->getZExtValue() == 0 &&
993 (CC == ISD::SETEQ || CC == ISD::SETNE)) {
994 // We'd like to combine a (CMP op1, (sub 0, op2) into a CMN instruction on
995 // the grounds that "op1 - (-op2) == op1 + op2". However, the C and V flags
996 // can be set differently by this operation. It comes down to whether
997 // "SInt(~op2)+1 == SInt(~op2+1)" (and the same for UInt). If they are then
998 // everything is fine. If not then the optimization is wrong. Thus general
999 // comparisons are only valid if op2 != 0.
1001 // So, finally, the only LLVM-native comparisons that don't mention C and V
1002 // are SETEQ and SETNE. They're the only ones we can safely use CMN for in
1003 // the absence of information about op2.
1004 Opcode = AArch64ISD::ADDS;
1005 RHS = RHS.getOperand(1);
1006 } else if (LHS.getOpcode() == ISD::AND && isa<ConstantSDNode>(RHS) &&
1007 cast<ConstantSDNode>(RHS)->getZExtValue() == 0 &&
1008 !isUnsignedIntSetCC(CC)) {
1009 // Similarly, (CMP (and X, Y), 0) can be implemented with a TST
1010 // (a.k.a. ANDS) except that the flags are only guaranteed to work for one
1011 // of the signed comparisons.
1012 Opcode = AArch64ISD::ANDS;
1013 RHS = LHS.getOperand(1);
1014 LHS = LHS.getOperand(0);
1017 return DAG.getNode(Opcode, dl, DAG.getVTList(VT, MVT::i32), LHS, RHS)
1021 static SDValue getAArch64Cmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
1022 SDValue &AArch64cc, SelectionDAG &DAG, SDLoc dl) {
1023 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS.getNode())) {
1024 EVT VT = RHS.getValueType();
1025 uint64_t C = RHSC->getZExtValue();
1026 if (!isLegalArithImmed(C)) {
1027 // Constant does not fit, try adjusting it by one?
1033 if ((VT == MVT::i32 && C != 0x80000000 &&
1034 isLegalArithImmed((uint32_t)(C - 1))) ||
1035 (VT == MVT::i64 && C != 0x80000000ULL &&
1036 isLegalArithImmed(C - 1ULL))) {
1037 CC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGT;
1038 C = (VT == MVT::i32) ? (uint32_t)(C - 1) : C - 1;
1039 RHS = DAG.getConstant(C, VT);
1044 if ((VT == MVT::i32 && C != 0 &&
1045 isLegalArithImmed((uint32_t)(C - 1))) ||
1046 (VT == MVT::i64 && C != 0ULL && isLegalArithImmed(C - 1ULL))) {
1047 CC = (CC == ISD::SETULT) ? ISD::SETULE : ISD::SETUGT;
1048 C = (VT == MVT::i32) ? (uint32_t)(C - 1) : C - 1;
1049 RHS = DAG.getConstant(C, VT);
1054 if ((VT == MVT::i32 && C != 0x7fffffff &&
1055 isLegalArithImmed((uint32_t)(C + 1))) ||
1056 (VT == MVT::i64 && C != 0x7ffffffffffffffULL &&
1057 isLegalArithImmed(C + 1ULL))) {
1058 CC = (CC == ISD::SETLE) ? ISD::SETLT : ISD::SETGE;
1059 C = (VT == MVT::i32) ? (uint32_t)(C + 1) : C + 1;
1060 RHS = DAG.getConstant(C, VT);
1065 if ((VT == MVT::i32 && C != 0xffffffff &&
1066 isLegalArithImmed((uint32_t)(C + 1))) ||
1067 (VT == MVT::i64 && C != 0xfffffffffffffffULL &&
1068 isLegalArithImmed(C + 1ULL))) {
1069 CC = (CC == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE;
1070 C = (VT == MVT::i32) ? (uint32_t)(C + 1) : C + 1;
1071 RHS = DAG.getConstant(C, VT);
1078 SDValue Cmp = emitComparison(LHS, RHS, CC, dl, DAG);
1079 AArch64CC::CondCode AArch64CC = changeIntCCToAArch64CC(CC);
1080 AArch64cc = DAG.getConstant(AArch64CC, MVT::i32);
1084 static std::pair<SDValue, SDValue>
1085 getAArch64XALUOOp(AArch64CC::CondCode &CC, SDValue Op, SelectionDAG &DAG) {
1086 assert((Op.getValueType() == MVT::i32 || Op.getValueType() == MVT::i64) &&
1087 "Unsupported value type");
1088 SDValue Value, Overflow;
1090 SDValue LHS = Op.getOperand(0);
1091 SDValue RHS = Op.getOperand(1);
1093 switch (Op.getOpcode()) {
1095 llvm_unreachable("Unknown overflow instruction!");
1097 Opc = AArch64ISD::ADDS;
1101 Opc = AArch64ISD::ADDS;
1105 Opc = AArch64ISD::SUBS;
1109 Opc = AArch64ISD::SUBS;
1112 // Multiply needs a little bit extra work.
1116 bool IsSigned = (Op.getOpcode() == ISD::SMULO) ? true : false;
1117 if (Op.getValueType() == MVT::i32) {
1118 unsigned ExtendOpc = IsSigned ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
1119 // For a 32 bit multiply with overflow check we want the instruction
1120 // selector to generate a widening multiply (SMADDL/UMADDL). For that we
1121 // need to generate the following pattern:
1122 // (i64 add 0, (i64 mul (i64 sext|zext i32 %a), (i64 sext|zext i32 %b))
1123 LHS = DAG.getNode(ExtendOpc, DL, MVT::i64, LHS);
1124 RHS = DAG.getNode(ExtendOpc, DL, MVT::i64, RHS);
1125 SDValue Mul = DAG.getNode(ISD::MUL, DL, MVT::i64, LHS, RHS);
1126 SDValue Add = DAG.getNode(ISD::ADD, DL, MVT::i64, Mul,
1127 DAG.getConstant(0, MVT::i64));
1128 // On AArch64 the upper 32 bits are always zero extended for a 32 bit
1129 // operation. We need to clear out the upper 32 bits, because we used a
1130 // widening multiply that wrote all 64 bits. In the end this should be a
1132 Value = DAG.getNode(ISD::TRUNCATE, DL, MVT::i32, Add);
1134 // The signed overflow check requires more than just a simple check for
1135 // any bit set in the upper 32 bits of the result. These bits could be
1136 // just the sign bits of a negative number. To perform the overflow
1137 // check we have to arithmetic shift right the 32nd bit of the result by
1138 // 31 bits. Then we compare the result to the upper 32 bits.
1139 SDValue UpperBits = DAG.getNode(ISD::SRL, DL, MVT::i64, Add,
1140 DAG.getConstant(32, MVT::i64));
1141 UpperBits = DAG.getNode(ISD::TRUNCATE, DL, MVT::i32, UpperBits);
1142 SDValue LowerBits = DAG.getNode(ISD::SRA, DL, MVT::i32, Value,
1143 DAG.getConstant(31, MVT::i64));
1144 // It is important that LowerBits is last, otherwise the arithmetic
1145 // shift will not be folded into the compare (SUBS).
1146 SDVTList VTs = DAG.getVTList(MVT::i32, MVT::i32);
1147 Overflow = DAG.getNode(AArch64ISD::SUBS, DL, VTs, UpperBits, LowerBits)
1150 // The overflow check for unsigned multiply is easy. We only need to
1151 // check if any of the upper 32 bits are set. This can be done with a
1152 // CMP (shifted register). For that we need to generate the following
1154 // (i64 AArch64ISD::SUBS i64 0, (i64 srl i64 %Mul, i64 32)
1155 SDValue UpperBits = DAG.getNode(ISD::SRL, DL, MVT::i64, Mul,
1156 DAG.getConstant(32, MVT::i64));
1157 SDVTList VTs = DAG.getVTList(MVT::i64, MVT::i32);
1159 DAG.getNode(AArch64ISD::SUBS, DL, VTs, DAG.getConstant(0, MVT::i64),
1160 UpperBits).getValue(1);
1164 assert(Op.getValueType() == MVT::i64 && "Expected an i64 value type");
1165 // For the 64 bit multiply
1166 Value = DAG.getNode(ISD::MUL, DL, MVT::i64, LHS, RHS);
1168 SDValue UpperBits = DAG.getNode(ISD::MULHS, DL, MVT::i64, LHS, RHS);
1169 SDValue LowerBits = DAG.getNode(ISD::SRA, DL, MVT::i64, Value,
1170 DAG.getConstant(63, MVT::i64));
1171 // It is important that LowerBits is last, otherwise the arithmetic
1172 // shift will not be folded into the compare (SUBS).
1173 SDVTList VTs = DAG.getVTList(MVT::i64, MVT::i32);
1174 Overflow = DAG.getNode(AArch64ISD::SUBS, DL, VTs, UpperBits, LowerBits)
1177 SDValue UpperBits = DAG.getNode(ISD::MULHU, DL, MVT::i64, LHS, RHS);
1178 SDVTList VTs = DAG.getVTList(MVT::i64, MVT::i32);
1180 DAG.getNode(AArch64ISD::SUBS, DL, VTs, DAG.getConstant(0, MVT::i64),
1181 UpperBits).getValue(1);
1188 SDVTList VTs = DAG.getVTList(Op->getValueType(0), MVT::i32);
1190 // Emit the AArch64 operation with overflow check.
1191 Value = DAG.getNode(Opc, DL, VTs, LHS, RHS);
1192 Overflow = Value.getValue(1);
1194 return std::make_pair(Value, Overflow);
1197 SDValue AArch64TargetLowering::LowerF128Call(SDValue Op, SelectionDAG &DAG,
1198 RTLIB::Libcall Call) const {
1199 SmallVector<SDValue, 2> Ops;
1200 for (unsigned i = 0, e = Op->getNumOperands(); i != e; ++i)
1201 Ops.push_back(Op.getOperand(i));
1203 return makeLibCall(DAG, Call, MVT::f128, &Ops[0], Ops.size(), false,
1207 static SDValue LowerXOR(SDValue Op, SelectionDAG &DAG) {
1208 SDValue Sel = Op.getOperand(0);
1209 SDValue Other = Op.getOperand(1);
1211 // If neither operand is a SELECT_CC, give up.
1212 if (Sel.getOpcode() != ISD::SELECT_CC)
1213 std::swap(Sel, Other);
1214 if (Sel.getOpcode() != ISD::SELECT_CC)
1217 // The folding we want to perform is:
1218 // (xor x, (select_cc a, b, cc, 0, -1) )
1220 // (csel x, (xor x, -1), cc ...)
1222 // The latter will get matched to a CSINV instruction.
1224 ISD::CondCode CC = cast<CondCodeSDNode>(Sel.getOperand(4))->get();
1225 SDValue LHS = Sel.getOperand(0);
1226 SDValue RHS = Sel.getOperand(1);
1227 SDValue TVal = Sel.getOperand(2);
1228 SDValue FVal = Sel.getOperand(3);
1231 // FIXME: This could be generalized to non-integer comparisons.
1232 if (LHS.getValueType() != MVT::i32 && LHS.getValueType() != MVT::i64)
1235 ConstantSDNode *CFVal = dyn_cast<ConstantSDNode>(FVal);
1236 ConstantSDNode *CTVal = dyn_cast<ConstantSDNode>(TVal);
1238 // The the values aren't constants, this isn't the pattern we're looking for.
1239 if (!CFVal || !CTVal)
1242 // We can commute the SELECT_CC by inverting the condition. This
1243 // might be needed to make this fit into a CSINV pattern.
1244 if (CTVal->isAllOnesValue() && CFVal->isNullValue()) {
1245 std::swap(TVal, FVal);
1246 std::swap(CTVal, CFVal);
1247 CC = ISD::getSetCCInverse(CC, true);
1250 // If the constants line up, perform the transform!
1251 if (CTVal->isNullValue() && CFVal->isAllOnesValue()) {
1253 SDValue Cmp = getAArch64Cmp(LHS, RHS, CC, CCVal, DAG, dl);
1256 TVal = DAG.getNode(ISD::XOR, dl, Other.getValueType(), Other,
1257 DAG.getConstant(-1ULL, Other.getValueType()));
1259 return DAG.getNode(AArch64ISD::CSEL, dl, Sel.getValueType(), FVal, TVal,
1266 static SDValue LowerADDC_ADDE_SUBC_SUBE(SDValue Op, SelectionDAG &DAG) {
1267 EVT VT = Op.getValueType();
1269 // Let legalize expand this if it isn't a legal type yet.
1270 if (!DAG.getTargetLoweringInfo().isTypeLegal(VT))
1273 SDVTList VTs = DAG.getVTList(VT, MVT::i32);
1276 bool ExtraOp = false;
1277 switch (Op.getOpcode()) {
1279 llvm_unreachable("Invalid code");
1281 Opc = AArch64ISD::ADDS;
1284 Opc = AArch64ISD::SUBS;
1287 Opc = AArch64ISD::ADCS;
1291 Opc = AArch64ISD::SBCS;
1297 return DAG.getNode(Opc, SDLoc(Op), VTs, Op.getOperand(0), Op.getOperand(1));
1298 return DAG.getNode(Opc, SDLoc(Op), VTs, Op.getOperand(0), Op.getOperand(1),
1302 static SDValue LowerXALUO(SDValue Op, SelectionDAG &DAG) {
1303 // Let legalize expand this if it isn't a legal type yet.
1304 if (!DAG.getTargetLoweringInfo().isTypeLegal(Op.getValueType()))
1307 AArch64CC::CondCode CC;
1308 // The actual operation that sets the overflow or carry flag.
1309 SDValue Value, Overflow;
1310 std::tie(Value, Overflow) = getAArch64XALUOOp(CC, Op, DAG);
1312 // We use 0 and 1 as false and true values.
1313 SDValue TVal = DAG.getConstant(1, MVT::i32);
1314 SDValue FVal = DAG.getConstant(0, MVT::i32);
1316 // We use an inverted condition, because the conditional select is inverted
1317 // too. This will allow it to be selected to a single instruction:
1318 // CSINC Wd, WZR, WZR, invert(cond).
1319 SDValue CCVal = DAG.getConstant(getInvertedCondCode(CC), MVT::i32);
1320 Overflow = DAG.getNode(AArch64ISD::CSEL, SDLoc(Op), MVT::i32, FVal, TVal,
1323 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::i32);
1324 return DAG.getNode(ISD::MERGE_VALUES, SDLoc(Op), VTs, Value, Overflow);
1327 // Prefetch operands are:
1328 // 1: Address to prefetch
1330 // 3: int locality (0 = no locality ... 3 = extreme locality)
1331 // 4: bool isDataCache
1332 static SDValue LowerPREFETCH(SDValue Op, SelectionDAG &DAG) {
1334 unsigned IsWrite = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue();
1335 unsigned Locality = cast<ConstantSDNode>(Op.getOperand(3))->getZExtValue();
1336 // The data thing is not used.
1337 // unsigned isData = cast<ConstantSDNode>(Op.getOperand(4))->getZExtValue();
1339 bool IsStream = !Locality;
1340 // When the locality number is set
1342 // The front-end should have filtered out the out-of-range values
1343 assert(Locality <= 3 && "Prefetch locality out-of-range");
1344 // The locality degree is the opposite of the cache speed.
1345 // Put the number the other way around.
1346 // The encoding starts at 0 for level 1
1347 Locality = 3 - Locality;
1350 // built the mask value encoding the expected behavior.
1351 unsigned PrfOp = (IsWrite << 4) | // Load/Store bit
1352 (Locality << 1) | // Cache level bits
1353 (unsigned)IsStream; // Stream bit
1354 return DAG.getNode(AArch64ISD::PREFETCH, DL, MVT::Other, Op.getOperand(0),
1355 DAG.getConstant(PrfOp, MVT::i32), Op.getOperand(1));
1358 SDValue AArch64TargetLowering::LowerFP_EXTEND(SDValue Op,
1359 SelectionDAG &DAG) const {
1360 assert(Op.getValueType() == MVT::f128 && "Unexpected lowering");
1363 LC = RTLIB::getFPEXT(Op.getOperand(0).getValueType(), Op.getValueType());
1365 return LowerF128Call(Op, DAG, LC);
1368 SDValue AArch64TargetLowering::LowerFP_ROUND(SDValue Op,
1369 SelectionDAG &DAG) const {
1370 if (Op.getOperand(0).getValueType() != MVT::f128) {
1371 // It's legal except when f128 is involved
1376 LC = RTLIB::getFPROUND(Op.getOperand(0).getValueType(), Op.getValueType());
1378 // FP_ROUND node has a second operand indicating whether it is known to be
1379 // precise. That doesn't take part in the LibCall so we can't directly use
1381 SDValue SrcVal = Op.getOperand(0);
1382 return makeLibCall(DAG, LC, Op.getValueType(), &SrcVal, 1,
1383 /*isSigned*/ false, SDLoc(Op)).first;
1386 static SDValue LowerVectorFP_TO_INT(SDValue Op, SelectionDAG &DAG) {
1387 // Warning: We maintain cost tables in AArch64TargetTransformInfo.cpp.
1388 // Any additional optimization in this function should be recorded
1389 // in the cost tables.
1390 EVT InVT = Op.getOperand(0).getValueType();
1391 EVT VT = Op.getValueType();
1393 if (VT.getSizeInBits() < InVT.getSizeInBits()) {
1396 DAG.getNode(Op.getOpcode(), dl, InVT.changeVectorElementTypeToInteger(),
1398 return DAG.getNode(ISD::TRUNCATE, dl, VT, Cv);
1401 if (VT.getSizeInBits() > InVT.getSizeInBits()) {
1403 SDValue Ext = DAG.getNode(ISD::FP_EXTEND, dl, MVT::v2f64, Op.getOperand(0));
1404 return DAG.getNode(Op.getOpcode(), dl, VT, Ext);
1407 // Type changing conversions are illegal.
1411 SDValue AArch64TargetLowering::LowerFP_TO_INT(SDValue Op,
1412 SelectionDAG &DAG) const {
1413 if (Op.getOperand(0).getValueType().isVector())
1414 return LowerVectorFP_TO_INT(Op, DAG);
1416 if (Op.getOperand(0).getValueType() != MVT::f128) {
1417 // It's legal except when f128 is involved
1422 if (Op.getOpcode() == ISD::FP_TO_SINT)
1423 LC = RTLIB::getFPTOSINT(Op.getOperand(0).getValueType(), Op.getValueType());
1425 LC = RTLIB::getFPTOUINT(Op.getOperand(0).getValueType(), Op.getValueType());
1427 SmallVector<SDValue, 2> Ops;
1428 for (unsigned i = 0, e = Op->getNumOperands(); i != e; ++i)
1429 Ops.push_back(Op.getOperand(i));
1431 return makeLibCall(DAG, LC, Op.getValueType(), &Ops[0], Ops.size(), false,
1435 static SDValue LowerVectorINT_TO_FP(SDValue Op, SelectionDAG &DAG) {
1436 // Warning: We maintain cost tables in AArch64TargetTransformInfo.cpp.
1437 // Any additional optimization in this function should be recorded
1438 // in the cost tables.
1439 EVT VT = Op.getValueType();
1441 SDValue In = Op.getOperand(0);
1442 EVT InVT = In.getValueType();
1444 if (VT.getSizeInBits() < InVT.getSizeInBits()) {
1446 MVT::getVectorVT(MVT::getFloatingPointVT(InVT.getScalarSizeInBits()),
1447 InVT.getVectorNumElements());
1448 In = DAG.getNode(Op.getOpcode(), dl, CastVT, In);
1449 return DAG.getNode(ISD::FP_ROUND, dl, VT, In, DAG.getIntPtrConstant(0));
1452 if (VT.getSizeInBits() > InVT.getSizeInBits()) {
1454 Op.getOpcode() == ISD::SINT_TO_FP ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
1455 EVT CastVT = VT.changeVectorElementTypeToInteger();
1456 In = DAG.getNode(CastOpc, dl, CastVT, In);
1457 return DAG.getNode(Op.getOpcode(), dl, VT, In);
1463 SDValue AArch64TargetLowering::LowerINT_TO_FP(SDValue Op,
1464 SelectionDAG &DAG) const {
1465 if (Op.getValueType().isVector())
1466 return LowerVectorINT_TO_FP(Op, DAG);
1468 // i128 conversions are libcalls.
1469 if (Op.getOperand(0).getValueType() == MVT::i128)
1472 // Other conversions are legal, unless it's to the completely software-based
1474 if (Op.getValueType() != MVT::f128)
1478 if (Op.getOpcode() == ISD::SINT_TO_FP)
1479 LC = RTLIB::getSINTTOFP(Op.getOperand(0).getValueType(), Op.getValueType());
1481 LC = RTLIB::getUINTTOFP(Op.getOperand(0).getValueType(), Op.getValueType());
1483 return LowerF128Call(Op, DAG, LC);
1486 SDValue AArch64TargetLowering::LowerFSINCOS(SDValue Op,
1487 SelectionDAG &DAG) const {
1488 // For iOS, we want to call an alternative entry point: __sincos_stret,
1489 // which returns the values in two S / D registers.
1491 SDValue Arg = Op.getOperand(0);
1492 EVT ArgVT = Arg.getValueType();
1493 Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
1500 Entry.isSExt = false;
1501 Entry.isZExt = false;
1502 Args.push_back(Entry);
1504 const char *LibcallName =
1505 (ArgVT == MVT::f64) ? "__sincos_stret" : "__sincosf_stret";
1506 SDValue Callee = DAG.getExternalSymbol(LibcallName, getPointerTy());
1508 StructType *RetTy = StructType::get(ArgTy, ArgTy, NULL);
1509 TargetLowering::CallLoweringInfo CLI(DAG);
1510 CLI.setDebugLoc(dl).setChain(DAG.getEntryNode())
1511 .setCallee(CallingConv::Fast, RetTy, Callee, std::move(Args), 0);
1513 std::pair<SDValue, SDValue> CallResult = LowerCallTo(CLI);
1514 return CallResult.first;
1517 static SDValue LowerBITCAST(SDValue Op, SelectionDAG &DAG) {
1518 if (Op.getValueType() != MVT::f16)
1521 assert(Op.getOperand(0).getValueType() == MVT::i16);
1524 Op = DAG.getNode(ISD::ANY_EXTEND, DL, MVT::i32, Op.getOperand(0));
1525 Op = DAG.getNode(ISD::BITCAST, DL, MVT::f32, Op);
1527 DAG.getMachineNode(TargetOpcode::EXTRACT_SUBREG, DL, MVT::f16, Op,
1528 DAG.getTargetConstant(AArch64::hsub, MVT::i32)),
1533 SDValue AArch64TargetLowering::LowerOperation(SDValue Op,
1534 SelectionDAG &DAG) const {
1535 switch (Op.getOpcode()) {
1537 llvm_unreachable("unimplemented operand");
1540 return LowerBITCAST(Op, DAG);
1541 case ISD::GlobalAddress:
1542 return LowerGlobalAddress(Op, DAG);
1543 case ISD::GlobalTLSAddress:
1544 return LowerGlobalTLSAddress(Op, DAG);
1546 return LowerSETCC(Op, DAG);
1548 return LowerBR_CC(Op, DAG);
1550 return LowerSELECT(Op, DAG);
1551 case ISD::SELECT_CC:
1552 return LowerSELECT_CC(Op, DAG);
1553 case ISD::JumpTable:
1554 return LowerJumpTable(Op, DAG);
1555 case ISD::ConstantPool:
1556 return LowerConstantPool(Op, DAG);
1557 case ISD::BlockAddress:
1558 return LowerBlockAddress(Op, DAG);
1560 return LowerVASTART(Op, DAG);
1562 return LowerVACOPY(Op, DAG);
1564 return LowerVAARG(Op, DAG);
1569 return LowerADDC_ADDE_SUBC_SUBE(Op, DAG);
1576 return LowerXALUO(Op, DAG);
1578 return LowerF128Call(Op, DAG, RTLIB::ADD_F128);
1580 return LowerF128Call(Op, DAG, RTLIB::SUB_F128);
1582 return LowerF128Call(Op, DAG, RTLIB::MUL_F128);
1584 return LowerF128Call(Op, DAG, RTLIB::DIV_F128);
1586 return LowerFP_ROUND(Op, DAG);
1587 case ISD::FP_EXTEND:
1588 return LowerFP_EXTEND(Op, DAG);
1589 case ISD::FRAMEADDR:
1590 return LowerFRAMEADDR(Op, DAG);
1591 case ISD::RETURNADDR:
1592 return LowerRETURNADDR(Op, DAG);
1593 case ISD::INSERT_VECTOR_ELT:
1594 return LowerINSERT_VECTOR_ELT(Op, DAG);
1595 case ISD::EXTRACT_VECTOR_ELT:
1596 return LowerEXTRACT_VECTOR_ELT(Op, DAG);
1597 case ISD::BUILD_VECTOR:
1598 return LowerBUILD_VECTOR(Op, DAG);
1599 case ISD::VECTOR_SHUFFLE:
1600 return LowerVECTOR_SHUFFLE(Op, DAG);
1601 case ISD::EXTRACT_SUBVECTOR:
1602 return LowerEXTRACT_SUBVECTOR(Op, DAG);
1606 return LowerVectorSRA_SRL_SHL(Op, DAG);
1607 case ISD::SHL_PARTS:
1608 return LowerShiftLeftParts(Op, DAG);
1609 case ISD::SRL_PARTS:
1610 case ISD::SRA_PARTS:
1611 return LowerShiftRightParts(Op, DAG);
1613 return LowerCTPOP(Op, DAG);
1614 case ISD::FCOPYSIGN:
1615 return LowerFCOPYSIGN(Op, DAG);
1617 return LowerVectorAND(Op, DAG);
1619 return LowerVectorOR(Op, DAG);
1621 return LowerXOR(Op, DAG);
1623 return LowerPREFETCH(Op, DAG);
1624 case ISD::SINT_TO_FP:
1625 case ISD::UINT_TO_FP:
1626 return LowerINT_TO_FP(Op, DAG);
1627 case ISD::FP_TO_SINT:
1628 case ISD::FP_TO_UINT:
1629 return LowerFP_TO_INT(Op, DAG);
1631 return LowerFSINCOS(Op, DAG);
1635 /// getFunctionAlignment - Return the Log2 alignment of this function.
1636 unsigned AArch64TargetLowering::getFunctionAlignment(const Function *F) const {
1640 //===----------------------------------------------------------------------===//
1641 // Calling Convention Implementation
1642 //===----------------------------------------------------------------------===//
1644 #include "AArch64GenCallingConv.inc"
1646 /// Selects the correct CCAssignFn for a the given CallingConvention
1648 CCAssignFn *AArch64TargetLowering::CCAssignFnForCall(CallingConv::ID CC,
1649 bool IsVarArg) const {
1652 llvm_unreachable("Unsupported calling convention.");
1653 case CallingConv::WebKit_JS:
1654 return CC_AArch64_WebKit_JS;
1655 case CallingConv::C:
1656 case CallingConv::Fast:
1657 if (!Subtarget->isTargetDarwin())
1658 return CC_AArch64_AAPCS;
1659 return IsVarArg ? CC_AArch64_DarwinPCS_VarArg : CC_AArch64_DarwinPCS;
1663 SDValue AArch64TargetLowering::LowerFormalArguments(
1664 SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
1665 const SmallVectorImpl<ISD::InputArg> &Ins, SDLoc DL, SelectionDAG &DAG,
1666 SmallVectorImpl<SDValue> &InVals) const {
1667 MachineFunction &MF = DAG.getMachineFunction();
1668 MachineFrameInfo *MFI = MF.getFrameInfo();
1670 // Assign locations to all of the incoming arguments.
1671 SmallVector<CCValAssign, 16> ArgLocs;
1672 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
1673 getTargetMachine(), ArgLocs, *DAG.getContext());
1675 // At this point, Ins[].VT may already be promoted to i32. To correctly
1676 // handle passing i8 as i8 instead of i32 on stack, we pass in both i32 and
1677 // i8 to CC_AArch64_AAPCS with i32 being ValVT and i8 being LocVT.
1678 // Since AnalyzeFormalArguments uses Ins[].VT for both ValVT and LocVT, here
1679 // we use a special version of AnalyzeFormalArguments to pass in ValVT and
1681 unsigned NumArgs = Ins.size();
1682 Function::const_arg_iterator CurOrigArg = MF.getFunction()->arg_begin();
1683 unsigned CurArgIdx = 0;
1684 for (unsigned i = 0; i != NumArgs; ++i) {
1685 MVT ValVT = Ins[i].VT;
1686 std::advance(CurOrigArg, Ins[i].OrigArgIndex - CurArgIdx);
1687 CurArgIdx = Ins[i].OrigArgIndex;
1689 // Get type of the original argument.
1690 EVT ActualVT = getValueType(CurOrigArg->getType(), /*AllowUnknown*/ true);
1691 MVT ActualMVT = ActualVT.isSimple() ? ActualVT.getSimpleVT() : MVT::Other;
1692 // If ActualMVT is i1/i8/i16, we should set LocVT to i8/i8/i16.
1693 if (ActualMVT == MVT::i1 || ActualMVT == MVT::i8)
1695 else if (ActualMVT == MVT::i16)
1698 CCAssignFn *AssignFn = CCAssignFnForCall(CallConv, /*IsVarArg=*/false);
1700 AssignFn(i, ValVT, ValVT, CCValAssign::Full, Ins[i].Flags, CCInfo);
1701 assert(!Res && "Call operand has unhandled type");
1704 assert(ArgLocs.size() == Ins.size());
1705 SmallVector<SDValue, 16> ArgValues;
1706 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
1707 CCValAssign &VA = ArgLocs[i];
1709 if (Ins[i].Flags.isByVal()) {
1710 // Byval is used for HFAs in the PCS, but the system should work in a
1711 // non-compliant manner for larger structs.
1712 EVT PtrTy = getPointerTy();
1713 int Size = Ins[i].Flags.getByValSize();
1714 unsigned NumRegs = (Size + 7) / 8;
1716 // FIXME: This works on big-endian for composite byvals, which are the common
1717 // case. It should also work for fundamental types too.
1719 MFI->CreateFixedObject(8 * NumRegs, VA.getLocMemOffset(), false);
1720 SDValue FrameIdxN = DAG.getFrameIndex(FrameIdx, PtrTy);
1721 InVals.push_back(FrameIdxN);
1726 if (VA.isRegLoc()) {
1727 // Arguments stored in registers.
1728 EVT RegVT = VA.getLocVT();
1731 const TargetRegisterClass *RC;
1733 if (RegVT == MVT::i32)
1734 RC = &AArch64::GPR32RegClass;
1735 else if (RegVT == MVT::i64)
1736 RC = &AArch64::GPR64RegClass;
1737 else if (RegVT == MVT::f16)
1738 RC = &AArch64::FPR16RegClass;
1739 else if (RegVT == MVT::f32)
1740 RC = &AArch64::FPR32RegClass;
1741 else if (RegVT == MVT::f64 || RegVT.is64BitVector())
1742 RC = &AArch64::FPR64RegClass;
1743 else if (RegVT == MVT::f128 || RegVT.is128BitVector())
1744 RC = &AArch64::FPR128RegClass;
1746 llvm_unreachable("RegVT not supported by FORMAL_ARGUMENTS Lowering");
1748 // Transform the arguments in physical registers into virtual ones.
1749 unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
1750 ArgValue = DAG.getCopyFromReg(Chain, DL, Reg, RegVT);
1752 // If this is an 8, 16 or 32-bit value, it is really passed promoted
1753 // to 64 bits. Insert an assert[sz]ext to capture this, then
1754 // truncate to the right size.
1755 switch (VA.getLocInfo()) {
1757 llvm_unreachable("Unknown loc info!");
1758 case CCValAssign::Full:
1760 case CCValAssign::BCvt:
1761 ArgValue = DAG.getNode(ISD::BITCAST, DL, VA.getValVT(), ArgValue);
1763 case CCValAssign::AExt:
1764 case CCValAssign::SExt:
1765 case CCValAssign::ZExt:
1766 // SelectionDAGBuilder will insert appropriate AssertZExt & AssertSExt
1767 // nodes after our lowering.
1768 assert(RegVT == Ins[i].VT && "incorrect register location selected");
1772 InVals.push_back(ArgValue);
1774 } else { // VA.isRegLoc()
1775 assert(VA.isMemLoc() && "CCValAssign is neither reg nor mem");
1776 unsigned ArgOffset = VA.getLocMemOffset();
1777 unsigned ArgSize = VA.getLocVT().getSizeInBits() / 8;
1779 uint32_t BEAlign = 0;
1780 if (ArgSize < 8 && !Subtarget->isLittleEndian())
1781 BEAlign = 8 - ArgSize;
1783 int FI = MFI->CreateFixedObject(ArgSize, ArgOffset + BEAlign, true);
1785 // Create load nodes to retrieve arguments from the stack.
1786 SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
1789 // For NON_EXTLOAD, generic code in getLoad assert(ValVT == MemVT)
1790 ISD::LoadExtType ExtType = ISD::NON_EXTLOAD;
1791 MVT MemVT = VA.getValVT();
1793 switch (VA.getLocInfo()) {
1796 case CCValAssign::BCvt:
1797 MemVT = VA.getLocVT();
1799 case CCValAssign::SExt:
1800 ExtType = ISD::SEXTLOAD;
1802 case CCValAssign::ZExt:
1803 ExtType = ISD::ZEXTLOAD;
1805 case CCValAssign::AExt:
1806 ExtType = ISD::EXTLOAD;
1810 ArgValue = DAG.getExtLoad(ExtType, DL, VA.getLocVT(), Chain, FIN,
1811 MachinePointerInfo::getFixedStack(FI),
1812 MemVT, false, false, false, nullptr);
1814 InVals.push_back(ArgValue);
1820 if (!Subtarget->isTargetDarwin()) {
1821 // The AAPCS variadic function ABI is identical to the non-variadic
1822 // one. As a result there may be more arguments in registers and we should
1823 // save them for future reference.
1824 saveVarArgRegisters(CCInfo, DAG, DL, Chain);
1827 AArch64FunctionInfo *AFI = MF.getInfo<AArch64FunctionInfo>();
1828 // This will point to the next argument passed via stack.
1829 unsigned StackOffset = CCInfo.getNextStackOffset();
1830 // We currently pass all varargs at 8-byte alignment.
1831 StackOffset = ((StackOffset + 7) & ~7);
1832 AFI->setVarArgsStackIndex(MFI->CreateFixedObject(4, StackOffset, true));
1835 AArch64FunctionInfo *FuncInfo = MF.getInfo<AArch64FunctionInfo>();
1836 unsigned StackArgSize = CCInfo.getNextStackOffset();
1837 bool TailCallOpt = MF.getTarget().Options.GuaranteedTailCallOpt;
1838 if (DoesCalleeRestoreStack(CallConv, TailCallOpt)) {
1839 // This is a non-standard ABI so by fiat I say we're allowed to make full
1840 // use of the stack area to be popped, which must be aligned to 16 bytes in
1842 StackArgSize = RoundUpToAlignment(StackArgSize, 16);
1844 // If we're expected to restore the stack (e.g. fastcc) then we'll be adding
1845 // a multiple of 16.
1846 FuncInfo->setArgumentStackToRestore(StackArgSize);
1848 // This realignment carries over to the available bytes below. Our own
1849 // callers will guarantee the space is free by giving an aligned value to
1852 // Even if we're not expected to free up the space, it's useful to know how
1853 // much is there while considering tail calls (because we can reuse it).
1854 FuncInfo->setBytesInStackArgArea(StackArgSize);
1859 void AArch64TargetLowering::saveVarArgRegisters(CCState &CCInfo,
1860 SelectionDAG &DAG, SDLoc DL,
1861 SDValue &Chain) const {
1862 MachineFunction &MF = DAG.getMachineFunction();
1863 MachineFrameInfo *MFI = MF.getFrameInfo();
1864 AArch64FunctionInfo *FuncInfo = MF.getInfo<AArch64FunctionInfo>();
1866 SmallVector<SDValue, 8> MemOps;
1868 static const MCPhysReg GPRArgRegs[] = { AArch64::X0, AArch64::X1, AArch64::X2,
1869 AArch64::X3, AArch64::X4, AArch64::X5,
1870 AArch64::X6, AArch64::X7 };
1871 static const unsigned NumGPRArgRegs = array_lengthof(GPRArgRegs);
1872 unsigned FirstVariadicGPR =
1873 CCInfo.getFirstUnallocated(GPRArgRegs, NumGPRArgRegs);
1875 unsigned GPRSaveSize = 8 * (NumGPRArgRegs - FirstVariadicGPR);
1877 if (GPRSaveSize != 0) {
1878 GPRIdx = MFI->CreateStackObject(GPRSaveSize, 8, false);
1880 SDValue FIN = DAG.getFrameIndex(GPRIdx, getPointerTy());
1882 for (unsigned i = FirstVariadicGPR; i < NumGPRArgRegs; ++i) {
1883 unsigned VReg = MF.addLiveIn(GPRArgRegs[i], &AArch64::GPR64RegClass);
1884 SDValue Val = DAG.getCopyFromReg(Chain, DL, VReg, MVT::i64);
1886 DAG.getStore(Val.getValue(1), DL, Val, FIN,
1887 MachinePointerInfo::getStack(i * 8), false, false, 0);
1888 MemOps.push_back(Store);
1889 FIN = DAG.getNode(ISD::ADD, DL, getPointerTy(), FIN,
1890 DAG.getConstant(8, getPointerTy()));
1893 FuncInfo->setVarArgsGPRIndex(GPRIdx);
1894 FuncInfo->setVarArgsGPRSize(GPRSaveSize);
1896 if (Subtarget->hasFPARMv8()) {
1897 static const MCPhysReg FPRArgRegs[] = {
1898 AArch64::Q0, AArch64::Q1, AArch64::Q2, AArch64::Q3,
1899 AArch64::Q4, AArch64::Q5, AArch64::Q6, AArch64::Q7};
1900 static const unsigned NumFPRArgRegs = array_lengthof(FPRArgRegs);
1901 unsigned FirstVariadicFPR =
1902 CCInfo.getFirstUnallocated(FPRArgRegs, NumFPRArgRegs);
1904 unsigned FPRSaveSize = 16 * (NumFPRArgRegs - FirstVariadicFPR);
1906 if (FPRSaveSize != 0) {
1907 FPRIdx = MFI->CreateStackObject(FPRSaveSize, 16, false);
1909 SDValue FIN = DAG.getFrameIndex(FPRIdx, getPointerTy());
1911 for (unsigned i = FirstVariadicFPR; i < NumFPRArgRegs; ++i) {
1912 unsigned VReg = MF.addLiveIn(FPRArgRegs[i], &AArch64::FPR128RegClass);
1913 SDValue Val = DAG.getCopyFromReg(Chain, DL, VReg, MVT::f128);
1916 DAG.getStore(Val.getValue(1), DL, Val, FIN,
1917 MachinePointerInfo::getStack(i * 16), false, false, 0);
1918 MemOps.push_back(Store);
1919 FIN = DAG.getNode(ISD::ADD, DL, getPointerTy(), FIN,
1920 DAG.getConstant(16, getPointerTy()));
1923 FuncInfo->setVarArgsFPRIndex(FPRIdx);
1924 FuncInfo->setVarArgsFPRSize(FPRSaveSize);
1927 if (!MemOps.empty()) {
1928 Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, MemOps);
1932 /// LowerCallResult - Lower the result values of a call into the
1933 /// appropriate copies out of appropriate physical registers.
1934 SDValue AArch64TargetLowering::LowerCallResult(
1935 SDValue Chain, SDValue InFlag, CallingConv::ID CallConv, bool isVarArg,
1936 const SmallVectorImpl<ISD::InputArg> &Ins, SDLoc DL, SelectionDAG &DAG,
1937 SmallVectorImpl<SDValue> &InVals, bool isThisReturn,
1938 SDValue ThisVal) const {
1939 CCAssignFn *RetCC = CallConv == CallingConv::WebKit_JS
1940 ? RetCC_AArch64_WebKit_JS
1941 : RetCC_AArch64_AAPCS;
1942 // Assign locations to each value returned by this call.
1943 SmallVector<CCValAssign, 16> RVLocs;
1944 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
1945 getTargetMachine(), RVLocs, *DAG.getContext());
1946 CCInfo.AnalyzeCallResult(Ins, RetCC);
1948 // Copy all of the result registers out of their specified physreg.
1949 for (unsigned i = 0; i != RVLocs.size(); ++i) {
1950 CCValAssign VA = RVLocs[i];
1952 // Pass 'this' value directly from the argument to return value, to avoid
1953 // reg unit interference
1954 if (i == 0 && isThisReturn) {
1955 assert(!VA.needsCustom() && VA.getLocVT() == MVT::i64 &&
1956 "unexpected return calling convention register assignment");
1957 InVals.push_back(ThisVal);
1962 DAG.getCopyFromReg(Chain, DL, VA.getLocReg(), VA.getLocVT(), InFlag);
1963 Chain = Val.getValue(1);
1964 InFlag = Val.getValue(2);
1966 switch (VA.getLocInfo()) {
1968 llvm_unreachable("Unknown loc info!");
1969 case CCValAssign::Full:
1971 case CCValAssign::BCvt:
1972 Val = DAG.getNode(ISD::BITCAST, DL, VA.getValVT(), Val);
1976 InVals.push_back(Val);
1982 bool AArch64TargetLowering::isEligibleForTailCallOptimization(
1983 SDValue Callee, CallingConv::ID CalleeCC, bool isVarArg,
1984 bool isCalleeStructRet, bool isCallerStructRet,
1985 const SmallVectorImpl<ISD::OutputArg> &Outs,
1986 const SmallVectorImpl<SDValue> &OutVals,
1987 const SmallVectorImpl<ISD::InputArg> &Ins, SelectionDAG &DAG) const {
1988 // For CallingConv::C this function knows whether the ABI needs
1989 // changing. That's not true for other conventions so they will have to opt in
1991 if (!IsTailCallConvention(CalleeCC) && CalleeCC != CallingConv::C)
1994 const MachineFunction &MF = DAG.getMachineFunction();
1995 const Function *CallerF = MF.getFunction();
1996 CallingConv::ID CallerCC = CallerF->getCallingConv();
1997 bool CCMatch = CallerCC == CalleeCC;
1999 // Byval parameters hand the function a pointer directly into the stack area
2000 // we want to reuse during a tail call. Working around this *is* possible (see
2001 // X86) but less efficient and uglier in LowerCall.
2002 for (Function::const_arg_iterator i = CallerF->arg_begin(),
2003 e = CallerF->arg_end();
2005 if (i->hasByValAttr())
2008 if (getTargetMachine().Options.GuaranteedTailCallOpt) {
2009 if (IsTailCallConvention(CalleeCC) && CCMatch)
2014 // Now we search for cases where we can use a tail call without changing the
2015 // ABI. Sibcall is used in some places (particularly gcc) to refer to this
2018 // I want anyone implementing a new calling convention to think long and hard
2019 // about this assert.
2020 assert((!isVarArg || CalleeCC == CallingConv::C) &&
2021 "Unexpected variadic calling convention");
2023 if (isVarArg && !Outs.empty()) {
2024 // At least two cases here: if caller is fastcc then we can't have any
2025 // memory arguments (we'd be expected to clean up the stack afterwards). If
2026 // caller is C then we could potentially use its argument area.
2028 // FIXME: for now we take the most conservative of these in both cases:
2029 // disallow all variadic memory operands.
2030 SmallVector<CCValAssign, 16> ArgLocs;
2031 CCState CCInfo(CalleeCC, isVarArg, DAG.getMachineFunction(),
2032 getTargetMachine(), ArgLocs, *DAG.getContext());
2034 CCInfo.AnalyzeCallOperands(Outs, CCAssignFnForCall(CalleeCC, true));
2035 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i)
2036 if (!ArgLocs[i].isRegLoc())
2040 // If the calling conventions do not match, then we'd better make sure the
2041 // results are returned in the same way as what the caller expects.
2043 SmallVector<CCValAssign, 16> RVLocs1;
2044 CCState CCInfo1(CalleeCC, false, DAG.getMachineFunction(),
2045 getTargetMachine(), RVLocs1, *DAG.getContext());
2046 CCInfo1.AnalyzeCallResult(Ins, CCAssignFnForCall(CalleeCC, isVarArg));
2048 SmallVector<CCValAssign, 16> RVLocs2;
2049 CCState CCInfo2(CallerCC, false, DAG.getMachineFunction(),
2050 getTargetMachine(), RVLocs2, *DAG.getContext());
2051 CCInfo2.AnalyzeCallResult(Ins, CCAssignFnForCall(CallerCC, isVarArg));
2053 if (RVLocs1.size() != RVLocs2.size())
2055 for (unsigned i = 0, e = RVLocs1.size(); i != e; ++i) {
2056 if (RVLocs1[i].isRegLoc() != RVLocs2[i].isRegLoc())
2058 if (RVLocs1[i].getLocInfo() != RVLocs2[i].getLocInfo())
2060 if (RVLocs1[i].isRegLoc()) {
2061 if (RVLocs1[i].getLocReg() != RVLocs2[i].getLocReg())
2064 if (RVLocs1[i].getLocMemOffset() != RVLocs2[i].getLocMemOffset())
2070 // Nothing more to check if the callee is taking no arguments
2074 SmallVector<CCValAssign, 16> ArgLocs;
2075 CCState CCInfo(CalleeCC, isVarArg, DAG.getMachineFunction(),
2076 getTargetMachine(), ArgLocs, *DAG.getContext());
2078 CCInfo.AnalyzeCallOperands(Outs, CCAssignFnForCall(CalleeCC, isVarArg));
2080 const AArch64FunctionInfo *FuncInfo = MF.getInfo<AArch64FunctionInfo>();
2082 // If the stack arguments for this call would fit into our own save area then
2083 // the call can be made tail.
2084 return CCInfo.getNextStackOffset() <= FuncInfo->getBytesInStackArgArea();
2087 SDValue AArch64TargetLowering::addTokenForArgument(SDValue Chain,
2089 MachineFrameInfo *MFI,
2090 int ClobberedFI) const {
2091 SmallVector<SDValue, 8> ArgChains;
2092 int64_t FirstByte = MFI->getObjectOffset(ClobberedFI);
2093 int64_t LastByte = FirstByte + MFI->getObjectSize(ClobberedFI) - 1;
2095 // Include the original chain at the beginning of the list. When this is
2096 // used by target LowerCall hooks, this helps legalize find the
2097 // CALLSEQ_BEGIN node.
2098 ArgChains.push_back(Chain);
2100 // Add a chain value for each stack argument corresponding
2101 for (SDNode::use_iterator U = DAG.getEntryNode().getNode()->use_begin(),
2102 UE = DAG.getEntryNode().getNode()->use_end();
2104 if (LoadSDNode *L = dyn_cast<LoadSDNode>(*U))
2105 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(L->getBasePtr()))
2106 if (FI->getIndex() < 0) {
2107 int64_t InFirstByte = MFI->getObjectOffset(FI->getIndex());
2108 int64_t InLastByte = InFirstByte;
2109 InLastByte += MFI->getObjectSize(FI->getIndex()) - 1;
2111 if ((InFirstByte <= FirstByte && FirstByte <= InLastByte) ||
2112 (FirstByte <= InFirstByte && InFirstByte <= LastByte))
2113 ArgChains.push_back(SDValue(L, 1));
2116 // Build a tokenfactor for all the chains.
2117 return DAG.getNode(ISD::TokenFactor, SDLoc(Chain), MVT::Other, ArgChains);
2120 bool AArch64TargetLowering::DoesCalleeRestoreStack(CallingConv::ID CallCC,
2121 bool TailCallOpt) const {
2122 return CallCC == CallingConv::Fast && TailCallOpt;
2125 bool AArch64TargetLowering::IsTailCallConvention(CallingConv::ID CallCC) const {
2126 return CallCC == CallingConv::Fast;
2129 /// LowerCall - Lower a call to a callseq_start + CALL + callseq_end chain,
2130 /// and add input and output parameter nodes.
2132 AArch64TargetLowering::LowerCall(CallLoweringInfo &CLI,
2133 SmallVectorImpl<SDValue> &InVals) const {
2134 SelectionDAG &DAG = CLI.DAG;
2136 SmallVector<ISD::OutputArg, 32> &Outs = CLI.Outs;
2137 SmallVector<SDValue, 32> &OutVals = CLI.OutVals;
2138 SmallVector<ISD::InputArg, 32> &Ins = CLI.Ins;
2139 SDValue Chain = CLI.Chain;
2140 SDValue Callee = CLI.Callee;
2141 bool &IsTailCall = CLI.IsTailCall;
2142 CallingConv::ID CallConv = CLI.CallConv;
2143 bool IsVarArg = CLI.IsVarArg;
2145 MachineFunction &MF = DAG.getMachineFunction();
2146 bool IsStructRet = (Outs.empty()) ? false : Outs[0].Flags.isSRet();
2147 bool IsThisReturn = false;
2149 AArch64FunctionInfo *FuncInfo = MF.getInfo<AArch64FunctionInfo>();
2150 bool TailCallOpt = MF.getTarget().Options.GuaranteedTailCallOpt;
2151 bool IsSibCall = false;
2154 // Check if it's really possible to do a tail call.
2155 IsTailCall = isEligibleForTailCallOptimization(
2156 Callee, CallConv, IsVarArg, IsStructRet,
2157 MF.getFunction()->hasStructRetAttr(), Outs, OutVals, Ins, DAG);
2158 if (!IsTailCall && CLI.CS && CLI.CS->isMustTailCall())
2159 report_fatal_error("failed to perform tail call elimination on a call "
2160 "site marked musttail");
2162 // A sibling call is one where we're under the usual C ABI and not planning
2163 // to change that but can still do a tail call:
2164 if (!TailCallOpt && IsTailCall)
2171 // Analyze operands of the call, assigning locations to each operand.
2172 SmallVector<CCValAssign, 16> ArgLocs;
2173 CCState CCInfo(CallConv, IsVarArg, DAG.getMachineFunction(),
2174 getTargetMachine(), ArgLocs, *DAG.getContext());
2177 // Handle fixed and variable vector arguments differently.
2178 // Variable vector arguments always go into memory.
2179 unsigned NumArgs = Outs.size();
2181 for (unsigned i = 0; i != NumArgs; ++i) {
2182 MVT ArgVT = Outs[i].VT;
2183 ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
2184 CCAssignFn *AssignFn = CCAssignFnForCall(CallConv,
2185 /*IsVarArg=*/ !Outs[i].IsFixed);
2186 bool Res = AssignFn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, CCInfo);
2187 assert(!Res && "Call operand has unhandled type");
2191 // At this point, Outs[].VT may already be promoted to i32. To correctly
2192 // handle passing i8 as i8 instead of i32 on stack, we pass in both i32 and
2193 // i8 to CC_AArch64_AAPCS with i32 being ValVT and i8 being LocVT.
2194 // Since AnalyzeCallOperands uses Ins[].VT for both ValVT and LocVT, here
2195 // we use a special version of AnalyzeCallOperands to pass in ValVT and
2197 unsigned NumArgs = Outs.size();
2198 for (unsigned i = 0; i != NumArgs; ++i) {
2199 MVT ValVT = Outs[i].VT;
2200 // Get type of the original argument.
2201 EVT ActualVT = getValueType(CLI.getArgs()[Outs[i].OrigArgIndex].Ty,
2202 /*AllowUnknown*/ true);
2203 MVT ActualMVT = ActualVT.isSimple() ? ActualVT.getSimpleVT() : ValVT;
2204 ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
2205 // If ActualMVT is i1/i8/i16, we should set LocVT to i8/i8/i16.
2206 if (ActualMVT == MVT::i1 || ActualMVT == MVT::i8)
2208 else if (ActualMVT == MVT::i16)
2211 CCAssignFn *AssignFn = CCAssignFnForCall(CallConv, /*IsVarArg=*/false);
2212 bool Res = AssignFn(i, ValVT, ValVT, CCValAssign::Full, ArgFlags, CCInfo);
2213 assert(!Res && "Call operand has unhandled type");
2218 // Get a count of how many bytes are to be pushed on the stack.
2219 unsigned NumBytes = CCInfo.getNextStackOffset();
2222 // Since we're not changing the ABI to make this a tail call, the memory
2223 // operands are already available in the caller's incoming argument space.
2227 // FPDiff is the byte offset of the call's argument area from the callee's.
2228 // Stores to callee stack arguments will be placed in FixedStackSlots offset
2229 // by this amount for a tail call. In a sibling call it must be 0 because the
2230 // caller will deallocate the entire stack and the callee still expects its
2231 // arguments to begin at SP+0. Completely unused for non-tail calls.
2234 if (IsTailCall && !IsSibCall) {
2235 unsigned NumReusableBytes = FuncInfo->getBytesInStackArgArea();
2237 // Since callee will pop argument stack as a tail call, we must keep the
2238 // popped size 16-byte aligned.
2239 NumBytes = RoundUpToAlignment(NumBytes, 16);
2241 // FPDiff will be negative if this tail call requires more space than we
2242 // would automatically have in our incoming argument space. Positive if we
2243 // can actually shrink the stack.
2244 FPDiff = NumReusableBytes - NumBytes;
2246 // The stack pointer must be 16-byte aligned at all times it's used for a
2247 // memory operation, which in practice means at *all* times and in
2248 // particular across call boundaries. Therefore our own arguments started at
2249 // a 16-byte aligned SP and the delta applied for the tail call should
2250 // satisfy the same constraint.
2251 assert(FPDiff % 16 == 0 && "unaligned stack on tail call");
2254 // Adjust the stack pointer for the new arguments...
2255 // These operations are automatically eliminated by the prolog/epilog pass
2258 DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true), DL);
2260 SDValue StackPtr = DAG.getCopyFromReg(Chain, DL, AArch64::SP, getPointerTy());
2262 SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
2263 SmallVector<SDValue, 8> MemOpChains;
2265 // Walk the register/memloc assignments, inserting copies/loads.
2266 for (unsigned i = 0, realArgIdx = 0, e = ArgLocs.size(); i != e;
2267 ++i, ++realArgIdx) {
2268 CCValAssign &VA = ArgLocs[i];
2269 SDValue Arg = OutVals[realArgIdx];
2270 ISD::ArgFlagsTy Flags = Outs[realArgIdx].Flags;
2272 // Promote the value if needed.
2273 switch (VA.getLocInfo()) {
2275 llvm_unreachable("Unknown loc info!");
2276 case CCValAssign::Full:
2278 case CCValAssign::SExt:
2279 Arg = DAG.getNode(ISD::SIGN_EXTEND, DL, VA.getLocVT(), Arg);
2281 case CCValAssign::ZExt:
2282 Arg = DAG.getNode(ISD::ZERO_EXTEND, DL, VA.getLocVT(), Arg);
2284 case CCValAssign::AExt:
2285 if (Outs[realArgIdx].ArgVT == MVT::i1) {
2286 // AAPCS requires i1 to be zero-extended to 8-bits by the caller.
2287 Arg = DAG.getNode(ISD::TRUNCATE, DL, MVT::i1, Arg);
2288 Arg = DAG.getNode(ISD::ZERO_EXTEND, DL, MVT::i8, Arg);
2290 Arg = DAG.getNode(ISD::ANY_EXTEND, DL, VA.getLocVT(), Arg);
2292 case CCValAssign::BCvt:
2293 Arg = DAG.getNode(ISD::BITCAST, DL, VA.getLocVT(), Arg);
2295 case CCValAssign::FPExt:
2296 Arg = DAG.getNode(ISD::FP_EXTEND, DL, VA.getLocVT(), Arg);
2300 if (VA.isRegLoc()) {
2301 if (realArgIdx == 0 && Flags.isReturned() && Outs[0].VT == MVT::i64) {
2302 assert(VA.getLocVT() == MVT::i64 &&
2303 "unexpected calling convention register assignment");
2304 assert(!Ins.empty() && Ins[0].VT == MVT::i64 &&
2305 "unexpected use of 'returned'");
2306 IsThisReturn = true;
2308 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
2310 assert(VA.isMemLoc());
2313 MachinePointerInfo DstInfo;
2315 // FIXME: This works on big-endian for composite byvals, which are the
2316 // common case. It should also work for fundamental types too.
2317 uint32_t BEAlign = 0;
2318 unsigned OpSize = Flags.isByVal() ? Flags.getByValSize() * 8
2319 : VA.getLocVT().getSizeInBits();
2320 OpSize = (OpSize + 7) / 8;
2321 if (!Subtarget->isLittleEndian() && !Flags.isByVal()) {
2323 BEAlign = 8 - OpSize;
2325 unsigned LocMemOffset = VA.getLocMemOffset();
2326 int32_t Offset = LocMemOffset + BEAlign;
2327 SDValue PtrOff = DAG.getIntPtrConstant(Offset);
2328 PtrOff = DAG.getNode(ISD::ADD, DL, getPointerTy(), StackPtr, PtrOff);
2331 Offset = Offset + FPDiff;
2332 int FI = MF.getFrameInfo()->CreateFixedObject(OpSize, Offset, true);
2334 DstAddr = DAG.getFrameIndex(FI, getPointerTy());
2335 DstInfo = MachinePointerInfo::getFixedStack(FI);
2337 // Make sure any stack arguments overlapping with where we're storing
2338 // are loaded before this eventual operation. Otherwise they'll be
2340 Chain = addTokenForArgument(Chain, DAG, MF.getFrameInfo(), FI);
2342 SDValue PtrOff = DAG.getIntPtrConstant(Offset);
2344 DstAddr = DAG.getNode(ISD::ADD, DL, getPointerTy(), StackPtr, PtrOff);
2345 DstInfo = MachinePointerInfo::getStack(LocMemOffset);
2348 if (Outs[i].Flags.isByVal()) {
2350 DAG.getConstant(Outs[i].Flags.getByValSize(), MVT::i64);
2351 SDValue Cpy = DAG.getMemcpy(
2352 Chain, DL, DstAddr, Arg, SizeNode, Outs[i].Flags.getByValAlign(),
2353 /*isVolatile = */ false,
2354 /*alwaysInline = */ false, DstInfo, MachinePointerInfo());
2356 MemOpChains.push_back(Cpy);
2358 // Since we pass i1/i8/i16 as i1/i8/i16 on stack and Arg is already
2359 // promoted to a legal register type i32, we should truncate Arg back to
2361 if (VA.getValVT() == MVT::i1 || VA.getValVT() == MVT::i8 ||
2362 VA.getValVT() == MVT::i16)
2363 Arg = DAG.getNode(ISD::TRUNCATE, DL, VA.getValVT(), Arg);
2366 DAG.getStore(Chain, DL, Arg, DstAddr, DstInfo, false, false, 0);
2367 MemOpChains.push_back(Store);
2372 if (!MemOpChains.empty())
2373 Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, MemOpChains);
2375 // Build a sequence of copy-to-reg nodes chained together with token chain
2376 // and flag operands which copy the outgoing args into the appropriate regs.
2378 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
2379 Chain = DAG.getCopyToReg(Chain, DL, RegsToPass[i].first,
2380 RegsToPass[i].second, InFlag);
2381 InFlag = Chain.getValue(1);
2384 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
2385 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
2386 // node so that legalize doesn't hack it.
2387 if (getTargetMachine().getCodeModel() == CodeModel::Large &&
2388 Subtarget->isTargetMachO()) {
2389 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
2390 const GlobalValue *GV = G->getGlobal();
2391 bool InternalLinkage = GV->hasInternalLinkage();
2392 if (InternalLinkage)
2393 Callee = DAG.getTargetGlobalAddress(GV, DL, getPointerTy(), 0, 0);
2395 Callee = DAG.getTargetGlobalAddress(GV, DL, getPointerTy(), 0,
2397 Callee = DAG.getNode(AArch64ISD::LOADgot, DL, getPointerTy(), Callee);
2399 } else if (ExternalSymbolSDNode *S =
2400 dyn_cast<ExternalSymbolSDNode>(Callee)) {
2401 const char *Sym = S->getSymbol();
2403 DAG.getTargetExternalSymbol(Sym, getPointerTy(), AArch64II::MO_GOT);
2404 Callee = DAG.getNode(AArch64ISD::LOADgot, DL, getPointerTy(), Callee);
2406 } else if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
2407 const GlobalValue *GV = G->getGlobal();
2408 Callee = DAG.getTargetGlobalAddress(GV, DL, getPointerTy(), 0, 0);
2409 } else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
2410 const char *Sym = S->getSymbol();
2411 Callee = DAG.getTargetExternalSymbol(Sym, getPointerTy(), 0);
2414 // We don't usually want to end the call-sequence here because we would tidy
2415 // the frame up *after* the call, however in the ABI-changing tail-call case
2416 // we've carefully laid out the parameters so that when sp is reset they'll be
2417 // in the correct location.
2418 if (IsTailCall && !IsSibCall) {
2419 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
2420 DAG.getIntPtrConstant(0, true), InFlag, DL);
2421 InFlag = Chain.getValue(1);
2424 std::vector<SDValue> Ops;
2425 Ops.push_back(Chain);
2426 Ops.push_back(Callee);
2429 // Each tail call may have to adjust the stack by a different amount, so
2430 // this information must travel along with the operation for eventual
2431 // consumption by emitEpilogue.
2432 Ops.push_back(DAG.getTargetConstant(FPDiff, MVT::i32));
2435 // Add argument registers to the end of the list so that they are known live
2437 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
2438 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
2439 RegsToPass[i].second.getValueType()));
2441 // Add a register mask operand representing the call-preserved registers.
2442 const uint32_t *Mask;
2443 const TargetRegisterInfo *TRI = getTargetMachine().getRegisterInfo();
2444 const AArch64RegisterInfo *ARI =
2445 static_cast<const AArch64RegisterInfo *>(TRI);
2447 // For 'this' returns, use the X0-preserving mask if applicable
2448 Mask = ARI->getThisReturnPreservedMask(CallConv);
2450 IsThisReturn = false;
2451 Mask = ARI->getCallPreservedMask(CallConv);
2454 Mask = ARI->getCallPreservedMask(CallConv);
2456 assert(Mask && "Missing call preserved mask for calling convention");
2457 Ops.push_back(DAG.getRegisterMask(Mask));
2459 if (InFlag.getNode())
2460 Ops.push_back(InFlag);
2462 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
2464 // If we're doing a tall call, use a TC_RETURN here rather than an
2465 // actual call instruction.
2467 return DAG.getNode(AArch64ISD::TC_RETURN, DL, NodeTys, Ops);
2469 // Returns a chain and a flag for retval copy to use.
2470 Chain = DAG.getNode(AArch64ISD::CALL, DL, NodeTys, Ops);
2471 InFlag = Chain.getValue(1);
2473 uint64_t CalleePopBytes = DoesCalleeRestoreStack(CallConv, TailCallOpt)
2474 ? RoundUpToAlignment(NumBytes, 16)
2477 Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
2478 DAG.getIntPtrConstant(CalleePopBytes, true),
2481 InFlag = Chain.getValue(1);
2483 // Handle result values, copying them out of physregs into vregs that we
2485 return LowerCallResult(Chain, InFlag, CallConv, IsVarArg, Ins, DL, DAG,
2486 InVals, IsThisReturn,
2487 IsThisReturn ? OutVals[0] : SDValue());
2490 bool AArch64TargetLowering::CanLowerReturn(
2491 CallingConv::ID CallConv, MachineFunction &MF, bool isVarArg,
2492 const SmallVectorImpl<ISD::OutputArg> &Outs, LLVMContext &Context) const {
2493 CCAssignFn *RetCC = CallConv == CallingConv::WebKit_JS
2494 ? RetCC_AArch64_WebKit_JS
2495 : RetCC_AArch64_AAPCS;
2496 SmallVector<CCValAssign, 16> RVLocs;
2497 CCState CCInfo(CallConv, isVarArg, MF, getTargetMachine(), RVLocs, Context);
2498 return CCInfo.CheckReturn(Outs, RetCC);
2502 AArch64TargetLowering::LowerReturn(SDValue Chain, CallingConv::ID CallConv,
2504 const SmallVectorImpl<ISD::OutputArg> &Outs,
2505 const SmallVectorImpl<SDValue> &OutVals,
2506 SDLoc DL, SelectionDAG &DAG) const {
2507 CCAssignFn *RetCC = CallConv == CallingConv::WebKit_JS
2508 ? RetCC_AArch64_WebKit_JS
2509 : RetCC_AArch64_AAPCS;
2510 SmallVector<CCValAssign, 16> RVLocs;
2511 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
2512 getTargetMachine(), RVLocs, *DAG.getContext());
2513 CCInfo.AnalyzeReturn(Outs, RetCC);
2515 // Copy the result values into the output registers.
2517 SmallVector<SDValue, 4> RetOps(1, Chain);
2518 for (unsigned i = 0, realRVLocIdx = 0; i != RVLocs.size();
2519 ++i, ++realRVLocIdx) {
2520 CCValAssign &VA = RVLocs[i];
2521 assert(VA.isRegLoc() && "Can only return in registers!");
2522 SDValue Arg = OutVals[realRVLocIdx];
2524 switch (VA.getLocInfo()) {
2526 llvm_unreachable("Unknown loc info!");
2527 case CCValAssign::Full:
2528 if (Outs[i].ArgVT == MVT::i1) {
2529 // AAPCS requires i1 to be zero-extended to i8 by the producer of the
2530 // value. This is strictly redundant on Darwin (which uses "zeroext
2531 // i1"), but will be optimised out before ISel.
2532 Arg = DAG.getNode(ISD::TRUNCATE, DL, MVT::i1, Arg);
2533 Arg = DAG.getNode(ISD::ZERO_EXTEND, DL, VA.getLocVT(), Arg);
2536 case CCValAssign::BCvt:
2537 Arg = DAG.getNode(ISD::BITCAST, DL, VA.getLocVT(), Arg);
2541 Chain = DAG.getCopyToReg(Chain, DL, VA.getLocReg(), Arg, Flag);
2542 Flag = Chain.getValue(1);
2543 RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT()));
2546 RetOps[0] = Chain; // Update chain.
2548 // Add the flag if we have it.
2550 RetOps.push_back(Flag);
2552 return DAG.getNode(AArch64ISD::RET_FLAG, DL, MVT::Other, RetOps);
2555 //===----------------------------------------------------------------------===//
2556 // Other Lowering Code
2557 //===----------------------------------------------------------------------===//
2559 SDValue AArch64TargetLowering::LowerGlobalAddress(SDValue Op,
2560 SelectionDAG &DAG) const {
2561 EVT PtrVT = getPointerTy();
2563 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
2564 unsigned char OpFlags =
2565 Subtarget->ClassifyGlobalReference(GV, getTargetMachine());
2567 assert(cast<GlobalAddressSDNode>(Op)->getOffset() == 0 &&
2568 "unexpected offset in global node");
2570 // This also catched the large code model case for Darwin.
2571 if ((OpFlags & AArch64II::MO_GOT) != 0) {
2572 SDValue GotAddr = DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, OpFlags);
2573 // FIXME: Once remat is capable of dealing with instructions with register
2574 // operands, expand this into two nodes instead of using a wrapper node.
2575 return DAG.getNode(AArch64ISD::LOADgot, DL, PtrVT, GotAddr);
2578 if (getTargetMachine().getCodeModel() == CodeModel::Large) {
2579 const unsigned char MO_NC = AArch64II::MO_NC;
2581 AArch64ISD::WrapperLarge, DL, PtrVT,
2582 DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, AArch64II::MO_G3),
2583 DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, AArch64II::MO_G2 | MO_NC),
2584 DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, AArch64II::MO_G1 | MO_NC),
2585 DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, AArch64II::MO_G0 | MO_NC));
2587 // Use ADRP/ADD or ADRP/LDR for everything else: the small model on ELF and
2588 // the only correct model on Darwin.
2589 SDValue Hi = DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0,
2590 OpFlags | AArch64II::MO_PAGE);
2591 unsigned char LoFlags = OpFlags | AArch64II::MO_PAGEOFF | AArch64II::MO_NC;
2592 SDValue Lo = DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, LoFlags);
2594 SDValue ADRP = DAG.getNode(AArch64ISD::ADRP, DL, PtrVT, Hi);
2595 return DAG.getNode(AArch64ISD::ADDlow, DL, PtrVT, ADRP, Lo);
2599 /// \brief Convert a TLS address reference into the correct sequence of loads
2600 /// and calls to compute the variable's address (for Darwin, currently) and
2601 /// return an SDValue containing the final node.
2603 /// Darwin only has one TLS scheme which must be capable of dealing with the
2604 /// fully general situation, in the worst case. This means:
2605 /// + "extern __thread" declaration.
2606 /// + Defined in a possibly unknown dynamic library.
2608 /// The general system is that each __thread variable has a [3 x i64] descriptor
2609 /// which contains information used by the runtime to calculate the address. The
2610 /// only part of this the compiler needs to know about is the first xword, which
2611 /// contains a function pointer that must be called with the address of the
2612 /// entire descriptor in "x0".
2614 /// Since this descriptor may be in a different unit, in general even the
2615 /// descriptor must be accessed via an indirect load. The "ideal" code sequence
2617 /// adrp x0, _var@TLVPPAGE
2618 /// ldr x0, [x0, _var@TLVPPAGEOFF] ; x0 now contains address of descriptor
2619 /// ldr x1, [x0] ; x1 contains 1st entry of descriptor,
2620 /// ; the function pointer
2621 /// blr x1 ; Uses descriptor address in x0
2622 /// ; Address of _var is now in x0.
2624 /// If the address of _var's descriptor *is* known to the linker, then it can
2625 /// change the first "ldr" instruction to an appropriate "add x0, x0, #imm" for
2626 /// a slight efficiency gain.
2628 AArch64TargetLowering::LowerDarwinGlobalTLSAddress(SDValue Op,
2629 SelectionDAG &DAG) const {
2630 assert(Subtarget->isTargetDarwin() && "TLS only supported on Darwin");
2633 MVT PtrVT = getPointerTy();
2634 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
2637 DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, AArch64II::MO_TLS);
2638 SDValue DescAddr = DAG.getNode(AArch64ISD::LOADgot, DL, PtrVT, TLVPAddr);
2640 // The first entry in the descriptor is a function pointer that we must call
2641 // to obtain the address of the variable.
2642 SDValue Chain = DAG.getEntryNode();
2643 SDValue FuncTLVGet =
2644 DAG.getLoad(MVT::i64, DL, Chain, DescAddr, MachinePointerInfo::getGOT(),
2645 false, true, true, 8);
2646 Chain = FuncTLVGet.getValue(1);
2648 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
2649 MFI->setAdjustsStack(true);
2651 // TLS calls preserve all registers except those that absolutely must be
2652 // trashed: X0 (it takes an argument), LR (it's a call) and NZCV (let's not be
2654 const TargetRegisterInfo *TRI = getTargetMachine().getRegisterInfo();
2655 const AArch64RegisterInfo *ARI =
2656 static_cast<const AArch64RegisterInfo *>(TRI);
2657 const uint32_t *Mask = ARI->getTLSCallPreservedMask();
2659 // Finally, we can make the call. This is just a degenerate version of a
2660 // normal AArch64 call node: x0 takes the address of the descriptor, and
2661 // returns the address of the variable in this thread.
2662 Chain = DAG.getCopyToReg(Chain, DL, AArch64::X0, DescAddr, SDValue());
2664 DAG.getNode(AArch64ISD::CALL, DL, DAG.getVTList(MVT::Other, MVT::Glue),
2665 Chain, FuncTLVGet, DAG.getRegister(AArch64::X0, MVT::i64),
2666 DAG.getRegisterMask(Mask), Chain.getValue(1));
2667 return DAG.getCopyFromReg(Chain, DL, AArch64::X0, PtrVT, Chain.getValue(1));
2670 /// When accessing thread-local variables under either the general-dynamic or
2671 /// local-dynamic system, we make a "TLS-descriptor" call. The variable will
2672 /// have a descriptor, accessible via a PC-relative ADRP, and whose first entry
2673 /// is a function pointer to carry out the resolution. This function takes the
2674 /// address of the descriptor in X0 and returns the TPIDR_EL0 offset in X0. All
2675 /// other registers (except LR, NZCV) are preserved.
2677 /// Thus, the ideal call sequence on AArch64 is:
2679 /// adrp x0, :tlsdesc:thread_var
2680 /// ldr x8, [x0, :tlsdesc_lo12:thread_var]
2681 /// add x0, x0, :tlsdesc_lo12:thread_var
2682 /// .tlsdesccall thread_var
2684 /// (TPIDR_EL0 offset now in x0).
2686 /// The ".tlsdesccall" directive instructs the assembler to insert a particular
2687 /// relocation to help the linker relax this sequence if it turns out to be too
2690 /// FIXME: we currently produce an extra, duplicated, ADRP instruction, but this
2692 SDValue AArch64TargetLowering::LowerELFTLSDescCall(SDValue SymAddr,
2693 SDValue DescAddr, SDLoc DL,
2694 SelectionDAG &DAG) const {
2695 EVT PtrVT = getPointerTy();
2697 // The function we need to call is simply the first entry in the GOT for this
2698 // descriptor, load it in preparation.
2699 SDValue Func = DAG.getNode(AArch64ISD::LOADgot, DL, PtrVT, SymAddr);
2701 // TLS calls preserve all registers except those that absolutely must be
2702 // trashed: X0 (it takes an argument), LR (it's a call) and NZCV (let's not be
2704 const TargetRegisterInfo *TRI = getTargetMachine().getRegisterInfo();
2705 const AArch64RegisterInfo *ARI =
2706 static_cast<const AArch64RegisterInfo *>(TRI);
2707 const uint32_t *Mask = ARI->getTLSCallPreservedMask();
2709 // The function takes only one argument: the address of the descriptor itself
2711 SDValue Glue, Chain;
2712 Chain = DAG.getCopyToReg(DAG.getEntryNode(), DL, AArch64::X0, DescAddr, Glue);
2713 Glue = Chain.getValue(1);
2715 // We're now ready to populate the argument list, as with a normal call:
2716 SmallVector<SDValue, 6> Ops;
2717 Ops.push_back(Chain);
2718 Ops.push_back(Func);
2719 Ops.push_back(SymAddr);
2720 Ops.push_back(DAG.getRegister(AArch64::X0, PtrVT));
2721 Ops.push_back(DAG.getRegisterMask(Mask));
2722 Ops.push_back(Glue);
2724 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
2725 Chain = DAG.getNode(AArch64ISD::TLSDESC_CALL, DL, NodeTys, Ops);
2726 Glue = Chain.getValue(1);
2728 return DAG.getCopyFromReg(Chain, DL, AArch64::X0, PtrVT, Glue);
2732 AArch64TargetLowering::LowerELFGlobalTLSAddress(SDValue Op,
2733 SelectionDAG &DAG) const {
2734 assert(Subtarget->isTargetELF() && "This function expects an ELF target");
2735 assert(getTargetMachine().getCodeModel() == CodeModel::Small &&
2736 "ELF TLS only supported in small memory model");
2737 const GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
2739 TLSModel::Model Model = getTargetMachine().getTLSModel(GA->getGlobal());
2742 EVT PtrVT = getPointerTy();
2744 const GlobalValue *GV = GA->getGlobal();
2746 SDValue ThreadBase = DAG.getNode(AArch64ISD::THREAD_POINTER, DL, PtrVT);
2748 if (Model == TLSModel::LocalExec) {
2749 SDValue HiVar = DAG.getTargetGlobalAddress(
2750 GV, DL, PtrVT, 0, AArch64II::MO_TLS | AArch64II::MO_G1);
2751 SDValue LoVar = DAG.getTargetGlobalAddress(
2753 AArch64II::MO_TLS | AArch64II::MO_G0 | AArch64II::MO_NC);
2755 TPOff = SDValue(DAG.getMachineNode(AArch64::MOVZXi, DL, PtrVT, HiVar,
2756 DAG.getTargetConstant(16, MVT::i32)),
2758 TPOff = SDValue(DAG.getMachineNode(AArch64::MOVKXi, DL, PtrVT, TPOff, LoVar,
2759 DAG.getTargetConstant(0, MVT::i32)),
2761 } else if (Model == TLSModel::InitialExec) {
2762 TPOff = DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, AArch64II::MO_TLS);
2763 TPOff = DAG.getNode(AArch64ISD::LOADgot, DL, PtrVT, TPOff);
2764 } else if (Model == TLSModel::LocalDynamic) {
2765 // Local-dynamic accesses proceed in two phases. A general-dynamic TLS
2766 // descriptor call against the special symbol _TLS_MODULE_BASE_ to calculate
2767 // the beginning of the module's TLS region, followed by a DTPREL offset
2770 // These accesses will need deduplicating if there's more than one.
2771 AArch64FunctionInfo *MFI =
2772 DAG.getMachineFunction().getInfo<AArch64FunctionInfo>();
2773 MFI->incNumLocalDynamicTLSAccesses();
2775 // Accesses used in this sequence go via the TLS descriptor which lives in
2776 // the GOT. Prepare an address we can use to handle this.
2777 SDValue HiDesc = DAG.getTargetExternalSymbol(
2778 "_TLS_MODULE_BASE_", PtrVT, AArch64II::MO_TLS | AArch64II::MO_PAGE);
2779 SDValue LoDesc = DAG.getTargetExternalSymbol(
2780 "_TLS_MODULE_BASE_", PtrVT,
2781 AArch64II::MO_TLS | AArch64II::MO_PAGEOFF | AArch64II::MO_NC);
2783 // First argument to the descriptor call is the address of the descriptor
2785 SDValue DescAddr = DAG.getNode(AArch64ISD::ADRP, DL, PtrVT, HiDesc);
2786 DescAddr = DAG.getNode(AArch64ISD::ADDlow, DL, PtrVT, DescAddr, LoDesc);
2788 // The call needs a relocation too for linker relaxation. It doesn't make
2789 // sense to call it MO_PAGE or MO_PAGEOFF though so we need another copy of
2791 SDValue SymAddr = DAG.getTargetExternalSymbol("_TLS_MODULE_BASE_", PtrVT,
2794 // Now we can calculate the offset from TPIDR_EL0 to this module's
2795 // thread-local area.
2796 TPOff = LowerELFTLSDescCall(SymAddr, DescAddr, DL, DAG);
2798 // Now use :dtprel_whatever: operations to calculate this variable's offset
2799 // in its thread-storage area.
2800 SDValue HiVar = DAG.getTargetGlobalAddress(
2801 GV, DL, MVT::i64, 0, AArch64II::MO_TLS | AArch64II::MO_G1);
2802 SDValue LoVar = DAG.getTargetGlobalAddress(
2803 GV, DL, MVT::i64, 0,
2804 AArch64II::MO_TLS | AArch64II::MO_G0 | AArch64II::MO_NC);
2807 SDValue(DAG.getMachineNode(AArch64::MOVZXi, DL, PtrVT, HiVar,
2808 DAG.getTargetConstant(16, MVT::i32)),
2811 SDValue(DAG.getMachineNode(AArch64::MOVKXi, DL, PtrVT, DTPOff, LoVar,
2812 DAG.getTargetConstant(0, MVT::i32)),
2815 TPOff = DAG.getNode(ISD::ADD, DL, PtrVT, TPOff, DTPOff);
2816 } else if (Model == TLSModel::GeneralDynamic) {
2817 // Accesses used in this sequence go via the TLS descriptor which lives in
2818 // the GOT. Prepare an address we can use to handle this.
2819 SDValue HiDesc = DAG.getTargetGlobalAddress(
2820 GV, DL, PtrVT, 0, AArch64II::MO_TLS | AArch64II::MO_PAGE);
2821 SDValue LoDesc = DAG.getTargetGlobalAddress(
2823 AArch64II::MO_TLS | AArch64II::MO_PAGEOFF | AArch64II::MO_NC);
2825 // First argument to the descriptor call is the address of the descriptor
2827 SDValue DescAddr = DAG.getNode(AArch64ISD::ADRP, DL, PtrVT, HiDesc);
2828 DescAddr = DAG.getNode(AArch64ISD::ADDlow, DL, PtrVT, DescAddr, LoDesc);
2830 // The call needs a relocation too for linker relaxation. It doesn't make
2831 // sense to call it MO_PAGE or MO_PAGEOFF though so we need another copy of
2834 DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, AArch64II::MO_TLS);
2836 // Finally we can make a call to calculate the offset from tpidr_el0.
2837 TPOff = LowerELFTLSDescCall(SymAddr, DescAddr, DL, DAG);
2839 llvm_unreachable("Unsupported ELF TLS access model");
2841 return DAG.getNode(ISD::ADD, DL, PtrVT, ThreadBase, TPOff);
2844 SDValue AArch64TargetLowering::LowerGlobalTLSAddress(SDValue Op,
2845 SelectionDAG &DAG) const {
2846 if (Subtarget->isTargetDarwin())
2847 return LowerDarwinGlobalTLSAddress(Op, DAG);
2848 else if (Subtarget->isTargetELF())
2849 return LowerELFGlobalTLSAddress(Op, DAG);
2851 llvm_unreachable("Unexpected platform trying to use TLS");
2853 SDValue AArch64TargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) const {
2854 SDValue Chain = Op.getOperand(0);
2855 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
2856 SDValue LHS = Op.getOperand(2);
2857 SDValue RHS = Op.getOperand(3);
2858 SDValue Dest = Op.getOperand(4);
2861 // Handle f128 first, since lowering it will result in comparing the return
2862 // value of a libcall against zero, which is just what the rest of LowerBR_CC
2863 // is expecting to deal with.
2864 if (LHS.getValueType() == MVT::f128) {
2865 softenSetCCOperands(DAG, MVT::f128, LHS, RHS, CC, dl);
2867 // If softenSetCCOperands returned a scalar, we need to compare the result
2868 // against zero to select between true and false values.
2869 if (!RHS.getNode()) {
2870 RHS = DAG.getConstant(0, LHS.getValueType());
2875 // Optimize {s|u}{add|sub|mul}.with.overflow feeding into a branch
2877 unsigned Opc = LHS.getOpcode();
2878 if (LHS.getResNo() == 1 && isa<ConstantSDNode>(RHS) &&
2879 cast<ConstantSDNode>(RHS)->isOne() &&
2880 (Opc == ISD::SADDO || Opc == ISD::UADDO || Opc == ISD::SSUBO ||
2881 Opc == ISD::USUBO || Opc == ISD::SMULO || Opc == ISD::UMULO)) {
2882 assert((CC == ISD::SETEQ || CC == ISD::SETNE) &&
2883 "Unexpected condition code.");
2884 // Only lower legal XALUO ops.
2885 if (!DAG.getTargetLoweringInfo().isTypeLegal(LHS->getValueType(0)))
2888 // The actual operation with overflow check.
2889 AArch64CC::CondCode OFCC;
2890 SDValue Value, Overflow;
2891 std::tie(Value, Overflow) = getAArch64XALUOOp(OFCC, LHS.getValue(0), DAG);
2893 if (CC == ISD::SETNE)
2894 OFCC = getInvertedCondCode(OFCC);
2895 SDValue CCVal = DAG.getConstant(OFCC, MVT::i32);
2897 return DAG.getNode(AArch64ISD::BRCOND, SDLoc(LHS), MVT::Other, Chain, Dest,
2901 if (LHS.getValueType().isInteger()) {
2902 assert((LHS.getValueType() == RHS.getValueType()) &&
2903 (LHS.getValueType() == MVT::i32 || LHS.getValueType() == MVT::i64));
2905 // If the RHS of the comparison is zero, we can potentially fold this
2906 // to a specialized branch.
2907 const ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS);
2908 if (RHSC && RHSC->getZExtValue() == 0) {
2909 if (CC == ISD::SETEQ) {
2910 // See if we can use a TBZ to fold in an AND as well.
2911 // TBZ has a smaller branch displacement than CBZ. If the offset is
2912 // out of bounds, a late MI-layer pass rewrites branches.
2913 // 403.gcc is an example that hits this case.
2914 if (LHS.getOpcode() == ISD::AND &&
2915 isa<ConstantSDNode>(LHS.getOperand(1)) &&
2916 isPowerOf2_64(LHS.getConstantOperandVal(1))) {
2917 SDValue Test = LHS.getOperand(0);
2918 uint64_t Mask = LHS.getConstantOperandVal(1);
2920 // TBZ only operates on i64's, but the ext should be free.
2921 if (Test.getValueType() == MVT::i32)
2922 Test = DAG.getAnyExtOrTrunc(Test, dl, MVT::i64);
2924 return DAG.getNode(AArch64ISD::TBZ, dl, MVT::Other, Chain, Test,
2925 DAG.getConstant(Log2_64(Mask), MVT::i64), Dest);
2928 return DAG.getNode(AArch64ISD::CBZ, dl, MVT::Other, Chain, LHS, Dest);
2929 } else if (CC == ISD::SETNE) {
2930 // See if we can use a TBZ to fold in an AND as well.
2931 // TBZ has a smaller branch displacement than CBZ. If the offset is
2932 // out of bounds, a late MI-layer pass rewrites branches.
2933 // 403.gcc is an example that hits this case.
2934 if (LHS.getOpcode() == ISD::AND &&
2935 isa<ConstantSDNode>(LHS.getOperand(1)) &&
2936 isPowerOf2_64(LHS.getConstantOperandVal(1))) {
2937 SDValue Test = LHS.getOperand(0);
2938 uint64_t Mask = LHS.getConstantOperandVal(1);
2940 // TBNZ only operates on i64's, but the ext should be free.
2941 if (Test.getValueType() == MVT::i32)
2942 Test = DAG.getAnyExtOrTrunc(Test, dl, MVT::i64);
2944 return DAG.getNode(AArch64ISD::TBNZ, dl, MVT::Other, Chain, Test,
2945 DAG.getConstant(Log2_64(Mask), MVT::i64), Dest);
2948 return DAG.getNode(AArch64ISD::CBNZ, dl, MVT::Other, Chain, LHS, Dest);
2953 SDValue Cmp = getAArch64Cmp(LHS, RHS, CC, CCVal, DAG, dl);
2954 return DAG.getNode(AArch64ISD::BRCOND, dl, MVT::Other, Chain, Dest, CCVal,
2958 assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
2960 // Unfortunately, the mapping of LLVM FP CC's onto AArch64 CC's isn't totally
2961 // clean. Some of them require two branches to implement.
2962 SDValue Cmp = emitComparison(LHS, RHS, CC, dl, DAG);
2963 AArch64CC::CondCode CC1, CC2;
2964 changeFPCCToAArch64CC(CC, CC1, CC2);
2965 SDValue CC1Val = DAG.getConstant(CC1, MVT::i32);
2967 DAG.getNode(AArch64ISD::BRCOND, dl, MVT::Other, Chain, Dest, CC1Val, Cmp);
2968 if (CC2 != AArch64CC::AL) {
2969 SDValue CC2Val = DAG.getConstant(CC2, MVT::i32);
2970 return DAG.getNode(AArch64ISD::BRCOND, dl, MVT::Other, BR1, Dest, CC2Val,
2977 SDValue AArch64TargetLowering::LowerFCOPYSIGN(SDValue Op,
2978 SelectionDAG &DAG) const {
2979 EVT VT = Op.getValueType();
2982 SDValue In1 = Op.getOperand(0);
2983 SDValue In2 = Op.getOperand(1);
2984 EVT SrcVT = In2.getValueType();
2986 if (SrcVT == MVT::f32 && VT == MVT::f64)
2987 In2 = DAG.getNode(ISD::FP_EXTEND, DL, VT, In2);
2988 else if (SrcVT == MVT::f64 && VT == MVT::f32)
2989 In2 = DAG.getNode(ISD::FP_ROUND, DL, VT, In2, DAG.getIntPtrConstant(0));
2991 // FIXME: Src type is different, bail out for now. Can VT really be a
2998 SDValue EltMask, VecVal1, VecVal2;
2999 if (VT == MVT::f32 || VT == MVT::v2f32 || VT == MVT::v4f32) {
3002 EltMask = DAG.getConstant(0x80000000ULL, EltVT);
3004 if (!VT.isVector()) {
3005 VecVal1 = DAG.getTargetInsertSubreg(AArch64::ssub, DL, VecVT,
3006 DAG.getUNDEF(VecVT), In1);
3007 VecVal2 = DAG.getTargetInsertSubreg(AArch64::ssub, DL, VecVT,
3008 DAG.getUNDEF(VecVT), In2);
3010 VecVal1 = DAG.getNode(ISD::BITCAST, DL, VecVT, In1);
3011 VecVal2 = DAG.getNode(ISD::BITCAST, DL, VecVT, In2);
3013 } else if (VT == MVT::f64 || VT == MVT::v2f64) {
3017 // We want to materialize a mask with the the high bit set, but the AdvSIMD
3018 // immediate moves cannot materialize that in a single instruction for
3019 // 64-bit elements. Instead, materialize zero and then negate it.
3020 EltMask = DAG.getConstant(0, EltVT);
3022 if (!VT.isVector()) {
3023 VecVal1 = DAG.getTargetInsertSubreg(AArch64::dsub, DL, VecVT,
3024 DAG.getUNDEF(VecVT), In1);
3025 VecVal2 = DAG.getTargetInsertSubreg(AArch64::dsub, DL, VecVT,
3026 DAG.getUNDEF(VecVT), In2);
3028 VecVal1 = DAG.getNode(ISD::BITCAST, DL, VecVT, In1);
3029 VecVal2 = DAG.getNode(ISD::BITCAST, DL, VecVT, In2);
3032 llvm_unreachable("Invalid type for copysign!");
3035 std::vector<SDValue> BuildVectorOps;
3036 for (unsigned i = 0; i < VecVT.getVectorNumElements(); ++i)
3037 BuildVectorOps.push_back(EltMask);
3039 SDValue BuildVec = DAG.getNode(ISD::BUILD_VECTOR, DL, VecVT, BuildVectorOps);
3041 // If we couldn't materialize the mask above, then the mask vector will be
3042 // the zero vector, and we need to negate it here.
3043 if (VT == MVT::f64 || VT == MVT::v2f64) {
3044 BuildVec = DAG.getNode(ISD::BITCAST, DL, MVT::v2f64, BuildVec);
3045 BuildVec = DAG.getNode(ISD::FNEG, DL, MVT::v2f64, BuildVec);
3046 BuildVec = DAG.getNode(ISD::BITCAST, DL, MVT::v2i64, BuildVec);
3050 DAG.getNode(AArch64ISD::BIT, DL, VecVT, VecVal1, VecVal2, BuildVec);
3053 return DAG.getTargetExtractSubreg(AArch64::ssub, DL, VT, Sel);
3054 else if (VT == MVT::f64)
3055 return DAG.getTargetExtractSubreg(AArch64::dsub, DL, VT, Sel);
3057 return DAG.getNode(ISD::BITCAST, DL, VT, Sel);
3060 SDValue AArch64TargetLowering::LowerCTPOP(SDValue Op, SelectionDAG &DAG) const {
3061 if (DAG.getMachineFunction().getFunction()->getAttributes().hasAttribute(
3062 AttributeSet::FunctionIndex, Attribute::NoImplicitFloat))
3065 if (!Subtarget->hasNEON())
3068 // While there is no integer popcount instruction, it can
3069 // be more efficiently lowered to the following sequence that uses
3070 // AdvSIMD registers/instructions as long as the copies to/from
3071 // the AdvSIMD registers are cheap.
3072 // FMOV D0, X0 // copy 64-bit int to vector, high bits zero'd
3073 // CNT V0.8B, V0.8B // 8xbyte pop-counts
3074 // ADDV B0, V0.8B // sum 8xbyte pop-counts
3075 // UMOV X0, V0.B[0] // copy byte result back to integer reg
3076 SDValue Val = Op.getOperand(0);
3078 EVT VT = Op.getValueType();
3079 SDValue ZeroVec = DAG.getUNDEF(MVT::v8i8);
3082 if (VT == MVT::i32) {
3083 VecVal = DAG.getNode(ISD::BITCAST, DL, MVT::f32, Val);
3084 VecVal = DAG.getTargetInsertSubreg(AArch64::ssub, DL, MVT::v8i8, ZeroVec,
3087 VecVal = DAG.getNode(ISD::BITCAST, DL, MVT::v8i8, Val);
3090 SDValue CtPop = DAG.getNode(ISD::CTPOP, DL, MVT::v8i8, VecVal);
3091 SDValue UaddLV = DAG.getNode(
3092 ISD::INTRINSIC_WO_CHAIN, DL, MVT::i32,
3093 DAG.getConstant(Intrinsic::aarch64_neon_uaddlv, MVT::i32), CtPop);
3096 UaddLV = DAG.getNode(ISD::ZERO_EXTEND, DL, MVT::i64, UaddLV);
3100 SDValue AArch64TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
3102 if (Op.getValueType().isVector())
3103 return LowerVSETCC(Op, DAG);
3105 SDValue LHS = Op.getOperand(0);
3106 SDValue RHS = Op.getOperand(1);
3107 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
3110 // We chose ZeroOrOneBooleanContents, so use zero and one.
3111 EVT VT = Op.getValueType();
3112 SDValue TVal = DAG.getConstant(1, VT);
3113 SDValue FVal = DAG.getConstant(0, VT);
3115 // Handle f128 first, since one possible outcome is a normal integer
3116 // comparison which gets picked up by the next if statement.
3117 if (LHS.getValueType() == MVT::f128) {
3118 softenSetCCOperands(DAG, MVT::f128, LHS, RHS, CC, dl);
3120 // If softenSetCCOperands returned a scalar, use it.
3121 if (!RHS.getNode()) {
3122 assert(LHS.getValueType() == Op.getValueType() &&
3123 "Unexpected setcc expansion!");
3128 if (LHS.getValueType().isInteger()) {
3131 getAArch64Cmp(LHS, RHS, ISD::getSetCCInverse(CC, true), CCVal, DAG, dl);
3133 // Note that we inverted the condition above, so we reverse the order of
3134 // the true and false operands here. This will allow the setcc to be
3135 // matched to a single CSINC instruction.
3136 return DAG.getNode(AArch64ISD::CSEL, dl, VT, FVal, TVal, CCVal, Cmp);
3139 // Now we know we're dealing with FP values.
3140 assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
3142 // If that fails, we'll need to perform an FCMP + CSEL sequence. Go ahead
3143 // and do the comparison.
3144 SDValue Cmp = emitComparison(LHS, RHS, CC, dl, DAG);
3146 AArch64CC::CondCode CC1, CC2;
3147 changeFPCCToAArch64CC(CC, CC1, CC2);
3148 if (CC2 == AArch64CC::AL) {
3149 changeFPCCToAArch64CC(ISD::getSetCCInverse(CC, false), CC1, CC2);
3150 SDValue CC1Val = DAG.getConstant(CC1, MVT::i32);
3152 // Note that we inverted the condition above, so we reverse the order of
3153 // the true and false operands here. This will allow the setcc to be
3154 // matched to a single CSINC instruction.
3155 return DAG.getNode(AArch64ISD::CSEL, dl, VT, FVal, TVal, CC1Val, Cmp);
3157 // Unfortunately, the mapping of LLVM FP CC's onto AArch64 CC's isn't
3158 // totally clean. Some of them require two CSELs to implement. As is in
3159 // this case, we emit the first CSEL and then emit a second using the output
3160 // of the first as the RHS. We're effectively OR'ing the two CC's together.
3162 // FIXME: It would be nice if we could match the two CSELs to two CSINCs.
3163 SDValue CC1Val = DAG.getConstant(CC1, MVT::i32);
3165 DAG.getNode(AArch64ISD::CSEL, dl, VT, TVal, FVal, CC1Val, Cmp);
3167 SDValue CC2Val = DAG.getConstant(CC2, MVT::i32);
3168 return DAG.getNode(AArch64ISD::CSEL, dl, VT, TVal, CS1, CC2Val, Cmp);
3172 /// A SELECT_CC operation is really some kind of max or min if both values being
3173 /// compared are, in some sense, equal to the results in either case. However,
3174 /// it is permissible to compare f32 values and produce directly extended f64
3177 /// Extending the comparison operands would also be allowed, but is less likely
3178 /// to happen in practice since their use is right here. Note that truncate
3179 /// operations would *not* be semantically equivalent.
3180 static bool selectCCOpsAreFMaxCompatible(SDValue Cmp, SDValue Result) {
3184 ConstantFPSDNode *CCmp = dyn_cast<ConstantFPSDNode>(Cmp);
3185 ConstantFPSDNode *CResult = dyn_cast<ConstantFPSDNode>(Result);
3186 if (CCmp && CResult && Cmp.getValueType() == MVT::f32 &&
3187 Result.getValueType() == MVT::f64) {
3189 APFloat CmpVal = CCmp->getValueAPF();
3190 CmpVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &Lossy);
3191 return CResult->getValueAPF().bitwiseIsEqual(CmpVal);
3194 return Result->getOpcode() == ISD::FP_EXTEND && Result->getOperand(0) == Cmp;
3197 SDValue AArch64TargetLowering::LowerSELECT(SDValue Op,
3198 SelectionDAG &DAG) const {
3199 SDValue CC = Op->getOperand(0);
3200 SDValue TVal = Op->getOperand(1);
3201 SDValue FVal = Op->getOperand(2);
3204 unsigned Opc = CC.getOpcode();
3205 // Optimize {s|u}{add|sub|mul}.with.overflow feeding into a select
3207 if (CC.getResNo() == 1 &&
3208 (Opc == ISD::SADDO || Opc == ISD::UADDO || Opc == ISD::SSUBO ||
3209 Opc == ISD::USUBO || Opc == ISD::SMULO || Opc == ISD::UMULO)) {
3210 // Only lower legal XALUO ops.
3211 if (!DAG.getTargetLoweringInfo().isTypeLegal(CC->getValueType(0)))
3214 AArch64CC::CondCode OFCC;
3215 SDValue Value, Overflow;
3216 std::tie(Value, Overflow) = getAArch64XALUOOp(OFCC, CC.getValue(0), DAG);
3217 SDValue CCVal = DAG.getConstant(OFCC, MVT::i32);
3219 return DAG.getNode(AArch64ISD::CSEL, DL, Op.getValueType(), TVal, FVal,
3223 if (CC.getOpcode() == ISD::SETCC)
3224 return DAG.getSelectCC(DL, CC.getOperand(0), CC.getOperand(1), TVal, FVal,
3225 cast<CondCodeSDNode>(CC.getOperand(2))->get());
3227 return DAG.getSelectCC(DL, CC, DAG.getConstant(0, CC.getValueType()), TVal,
3231 SDValue AArch64TargetLowering::LowerSELECT_CC(SDValue Op,
3232 SelectionDAG &DAG) const {
3233 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
3234 SDValue LHS = Op.getOperand(0);
3235 SDValue RHS = Op.getOperand(1);
3236 SDValue TVal = Op.getOperand(2);
3237 SDValue FVal = Op.getOperand(3);
3240 // Handle f128 first, because it will result in a comparison of some RTLIB
3241 // call result against zero.
3242 if (LHS.getValueType() == MVT::f128) {
3243 softenSetCCOperands(DAG, MVT::f128, LHS, RHS, CC, dl);
3245 // If softenSetCCOperands returned a scalar, we need to compare the result
3246 // against zero to select between true and false values.
3247 if (!RHS.getNode()) {
3248 RHS = DAG.getConstant(0, LHS.getValueType());
3253 // Handle integers first.
3254 if (LHS.getValueType().isInteger()) {
3255 assert((LHS.getValueType() == RHS.getValueType()) &&
3256 (LHS.getValueType() == MVT::i32 || LHS.getValueType() == MVT::i64));
3258 unsigned Opcode = AArch64ISD::CSEL;
3260 // If both the TVal and the FVal are constants, see if we can swap them in
3261 // order to for a CSINV or CSINC out of them.
3262 ConstantSDNode *CFVal = dyn_cast<ConstantSDNode>(FVal);
3263 ConstantSDNode *CTVal = dyn_cast<ConstantSDNode>(TVal);
3265 if (CTVal && CFVal && CTVal->isAllOnesValue() && CFVal->isNullValue()) {
3266 std::swap(TVal, FVal);
3267 std::swap(CTVal, CFVal);
3268 CC = ISD::getSetCCInverse(CC, true);
3269 } else if (CTVal && CFVal && CTVal->isOne() && CFVal->isNullValue()) {
3270 std::swap(TVal, FVal);
3271 std::swap(CTVal, CFVal);
3272 CC = ISD::getSetCCInverse(CC, true);
3273 } else if (TVal.getOpcode() == ISD::XOR) {
3274 // If TVal is a NOT we want to swap TVal and FVal so that we can match
3275 // with a CSINV rather than a CSEL.
3276 ConstantSDNode *CVal = dyn_cast<ConstantSDNode>(TVal.getOperand(1));
3278 if (CVal && CVal->isAllOnesValue()) {
3279 std::swap(TVal, FVal);
3280 std::swap(CTVal, CFVal);
3281 CC = ISD::getSetCCInverse(CC, true);
3283 } else if (TVal.getOpcode() == ISD::SUB) {
3284 // If TVal is a negation (SUB from 0) we want to swap TVal and FVal so
3285 // that we can match with a CSNEG rather than a CSEL.
3286 ConstantSDNode *CVal = dyn_cast<ConstantSDNode>(TVal.getOperand(0));
3288 if (CVal && CVal->isNullValue()) {
3289 std::swap(TVal, FVal);
3290 std::swap(CTVal, CFVal);
3291 CC = ISD::getSetCCInverse(CC, true);
3293 } else if (CTVal && CFVal) {
3294 const int64_t TrueVal = CTVal->getSExtValue();
3295 const int64_t FalseVal = CFVal->getSExtValue();
3298 // If both TVal and FVal are constants, see if FVal is the
3299 // inverse/negation/increment of TVal and generate a CSINV/CSNEG/CSINC
3300 // instead of a CSEL in that case.
3301 if (TrueVal == ~FalseVal) {
3302 Opcode = AArch64ISD::CSINV;
3303 } else if (TrueVal == -FalseVal) {
3304 Opcode = AArch64ISD::CSNEG;
3305 } else if (TVal.getValueType() == MVT::i32) {
3306 // If our operands are only 32-bit wide, make sure we use 32-bit
3307 // arithmetic for the check whether we can use CSINC. This ensures that
3308 // the addition in the check will wrap around properly in case there is
3309 // an overflow (which would not be the case if we do the check with
3310 // 64-bit arithmetic).
3311 const uint32_t TrueVal32 = CTVal->getZExtValue();
3312 const uint32_t FalseVal32 = CFVal->getZExtValue();
3314 if ((TrueVal32 == FalseVal32 + 1) || (TrueVal32 + 1 == FalseVal32)) {
3315 Opcode = AArch64ISD::CSINC;
3317 if (TrueVal32 > FalseVal32) {
3321 // 64-bit check whether we can use CSINC.
3322 } else if ((TrueVal == FalseVal + 1) || (TrueVal + 1 == FalseVal)) {
3323 Opcode = AArch64ISD::CSINC;
3325 if (TrueVal > FalseVal) {
3330 // Swap TVal and FVal if necessary.
3332 std::swap(TVal, FVal);
3333 std::swap(CTVal, CFVal);
3334 CC = ISD::getSetCCInverse(CC, true);
3337 if (Opcode != AArch64ISD::CSEL) {
3338 // Drop FVal since we can get its value by simply inverting/negating
3345 SDValue Cmp = getAArch64Cmp(LHS, RHS, CC, CCVal, DAG, dl);
3347 EVT VT = Op.getValueType();
3348 return DAG.getNode(Opcode, dl, VT, TVal, FVal, CCVal, Cmp);
3351 // Now we know we're dealing with FP values.
3352 assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
3353 assert(LHS.getValueType() == RHS.getValueType());
3354 EVT VT = Op.getValueType();
3356 // Try to match this select into a max/min operation, which have dedicated
3357 // opcode in the instruction set.
3358 // FIXME: This is not correct in the presence of NaNs, so we only enable this
3360 if (getTargetMachine().Options.NoNaNsFPMath) {
3361 SDValue MinMaxLHS = TVal, MinMaxRHS = FVal;
3362 if (selectCCOpsAreFMaxCompatible(LHS, MinMaxRHS) &&
3363 selectCCOpsAreFMaxCompatible(RHS, MinMaxLHS)) {
3364 CC = ISD::getSetCCSwappedOperands(CC);
3365 std::swap(MinMaxLHS, MinMaxRHS);
3368 if (selectCCOpsAreFMaxCompatible(LHS, MinMaxLHS) &&
3369 selectCCOpsAreFMaxCompatible(RHS, MinMaxRHS)) {
3379 return DAG.getNode(AArch64ISD::FMAX, dl, VT, MinMaxLHS, MinMaxRHS);
3387 return DAG.getNode(AArch64ISD::FMIN, dl, VT, MinMaxLHS, MinMaxRHS);
3393 // If that fails, we'll need to perform an FCMP + CSEL sequence. Go ahead
3394 // and do the comparison.
3395 SDValue Cmp = emitComparison(LHS, RHS, CC, dl, DAG);
3397 // Unfortunately, the mapping of LLVM FP CC's onto AArch64 CC's isn't totally
3398 // clean. Some of them require two CSELs to implement.
3399 AArch64CC::CondCode CC1, CC2;
3400 changeFPCCToAArch64CC(CC, CC1, CC2);
3401 SDValue CC1Val = DAG.getConstant(CC1, MVT::i32);
3402 SDValue CS1 = DAG.getNode(AArch64ISD::CSEL, dl, VT, TVal, FVal, CC1Val, Cmp);
3404 // If we need a second CSEL, emit it, using the output of the first as the
3405 // RHS. We're effectively OR'ing the two CC's together.
3406 if (CC2 != AArch64CC::AL) {
3407 SDValue CC2Val = DAG.getConstant(CC2, MVT::i32);
3408 return DAG.getNode(AArch64ISD::CSEL, dl, VT, TVal, CS1, CC2Val, Cmp);
3411 // Otherwise, return the output of the first CSEL.
3415 SDValue AArch64TargetLowering::LowerJumpTable(SDValue Op,
3416 SelectionDAG &DAG) const {
3417 // Jump table entries as PC relative offsets. No additional tweaking
3418 // is necessary here. Just get the address of the jump table.
3419 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
3420 EVT PtrVT = getPointerTy();
3423 if (getTargetMachine().getCodeModel() == CodeModel::Large &&
3424 !Subtarget->isTargetMachO()) {
3425 const unsigned char MO_NC = AArch64II::MO_NC;
3427 AArch64ISD::WrapperLarge, DL, PtrVT,
3428 DAG.getTargetJumpTable(JT->getIndex(), PtrVT, AArch64II::MO_G3),
3429 DAG.getTargetJumpTable(JT->getIndex(), PtrVT, AArch64II::MO_G2 | MO_NC),
3430 DAG.getTargetJumpTable(JT->getIndex(), PtrVT, AArch64II::MO_G1 | MO_NC),
3431 DAG.getTargetJumpTable(JT->getIndex(), PtrVT,
3432 AArch64II::MO_G0 | MO_NC));
3436 DAG.getTargetJumpTable(JT->getIndex(), PtrVT, AArch64II::MO_PAGE);
3437 SDValue Lo = DAG.getTargetJumpTable(JT->getIndex(), PtrVT,
3438 AArch64II::MO_PAGEOFF | AArch64II::MO_NC);
3439 SDValue ADRP = DAG.getNode(AArch64ISD::ADRP, DL, PtrVT, Hi);
3440 return DAG.getNode(AArch64ISD::ADDlow, DL, PtrVT, ADRP, Lo);
3443 SDValue AArch64TargetLowering::LowerConstantPool(SDValue Op,
3444 SelectionDAG &DAG) const {
3445 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
3446 EVT PtrVT = getPointerTy();
3449 if (getTargetMachine().getCodeModel() == CodeModel::Large) {
3450 // Use the GOT for the large code model on iOS.
3451 if (Subtarget->isTargetMachO()) {
3452 SDValue GotAddr = DAG.getTargetConstantPool(
3453 CP->getConstVal(), PtrVT, CP->getAlignment(), CP->getOffset(),
3455 return DAG.getNode(AArch64ISD::LOADgot, DL, PtrVT, GotAddr);
3458 const unsigned char MO_NC = AArch64II::MO_NC;
3460 AArch64ISD::WrapperLarge, DL, PtrVT,
3461 DAG.getTargetConstantPool(CP->getConstVal(), PtrVT, CP->getAlignment(),
3462 CP->getOffset(), AArch64II::MO_G3),
3463 DAG.getTargetConstantPool(CP->getConstVal(), PtrVT, CP->getAlignment(),
3464 CP->getOffset(), AArch64II::MO_G2 | MO_NC),
3465 DAG.getTargetConstantPool(CP->getConstVal(), PtrVT, CP->getAlignment(),
3466 CP->getOffset(), AArch64II::MO_G1 | MO_NC),
3467 DAG.getTargetConstantPool(CP->getConstVal(), PtrVT, CP->getAlignment(),
3468 CP->getOffset(), AArch64II::MO_G0 | MO_NC));
3470 // Use ADRP/ADD or ADRP/LDR for everything else: the small memory model on
3471 // ELF, the only valid one on Darwin.
3473 DAG.getTargetConstantPool(CP->getConstVal(), PtrVT, CP->getAlignment(),
3474 CP->getOffset(), AArch64II::MO_PAGE);
3475 SDValue Lo = DAG.getTargetConstantPool(
3476 CP->getConstVal(), PtrVT, CP->getAlignment(), CP->getOffset(),
3477 AArch64II::MO_PAGEOFF | AArch64II::MO_NC);
3479 SDValue ADRP = DAG.getNode(AArch64ISD::ADRP, DL, PtrVT, Hi);
3480 return DAG.getNode(AArch64ISD::ADDlow, DL, PtrVT, ADRP, Lo);
3484 SDValue AArch64TargetLowering::LowerBlockAddress(SDValue Op,
3485 SelectionDAG &DAG) const {
3486 const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
3487 EVT PtrVT = getPointerTy();
3489 if (getTargetMachine().getCodeModel() == CodeModel::Large &&
3490 !Subtarget->isTargetMachO()) {
3491 const unsigned char MO_NC = AArch64II::MO_NC;
3493 AArch64ISD::WrapperLarge, DL, PtrVT,
3494 DAG.getTargetBlockAddress(BA, PtrVT, 0, AArch64II::MO_G3),
3495 DAG.getTargetBlockAddress(BA, PtrVT, 0, AArch64II::MO_G2 | MO_NC),
3496 DAG.getTargetBlockAddress(BA, PtrVT, 0, AArch64II::MO_G1 | MO_NC),
3497 DAG.getTargetBlockAddress(BA, PtrVT, 0, AArch64II::MO_G0 | MO_NC));
3499 SDValue Hi = DAG.getTargetBlockAddress(BA, PtrVT, 0, AArch64II::MO_PAGE);
3500 SDValue Lo = DAG.getTargetBlockAddress(BA, PtrVT, 0, AArch64II::MO_PAGEOFF |
3502 SDValue ADRP = DAG.getNode(AArch64ISD::ADRP, DL, PtrVT, Hi);
3503 return DAG.getNode(AArch64ISD::ADDlow, DL, PtrVT, ADRP, Lo);
3507 SDValue AArch64TargetLowering::LowerDarwin_VASTART(SDValue Op,
3508 SelectionDAG &DAG) const {
3509 AArch64FunctionInfo *FuncInfo =
3510 DAG.getMachineFunction().getInfo<AArch64FunctionInfo>();
3514 DAG.getFrameIndex(FuncInfo->getVarArgsStackIndex(), getPointerTy());
3515 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
3516 return DAG.getStore(Op.getOperand(0), DL, FR, Op.getOperand(1),
3517 MachinePointerInfo(SV), false, false, 0);
3520 SDValue AArch64TargetLowering::LowerAAPCS_VASTART(SDValue Op,
3521 SelectionDAG &DAG) const {
3522 // The layout of the va_list struct is specified in the AArch64 Procedure Call
3523 // Standard, section B.3.
3524 MachineFunction &MF = DAG.getMachineFunction();
3525 AArch64FunctionInfo *FuncInfo = MF.getInfo<AArch64FunctionInfo>();
3528 SDValue Chain = Op.getOperand(0);
3529 SDValue VAList = Op.getOperand(1);
3530 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
3531 SmallVector<SDValue, 4> MemOps;
3533 // void *__stack at offset 0
3535 DAG.getFrameIndex(FuncInfo->getVarArgsStackIndex(), getPointerTy());
3536 MemOps.push_back(DAG.getStore(Chain, DL, Stack, VAList,
3537 MachinePointerInfo(SV), false, false, 8));
3539 // void *__gr_top at offset 8
3540 int GPRSize = FuncInfo->getVarArgsGPRSize();
3542 SDValue GRTop, GRTopAddr;
3544 GRTopAddr = DAG.getNode(ISD::ADD, DL, getPointerTy(), VAList,
3545 DAG.getConstant(8, getPointerTy()));
3547 GRTop = DAG.getFrameIndex(FuncInfo->getVarArgsGPRIndex(), getPointerTy());
3548 GRTop = DAG.getNode(ISD::ADD, DL, getPointerTy(), GRTop,
3549 DAG.getConstant(GPRSize, getPointerTy()));
3551 MemOps.push_back(DAG.getStore(Chain, DL, GRTop, GRTopAddr,
3552 MachinePointerInfo(SV, 8), false, false, 8));
3555 // void *__vr_top at offset 16
3556 int FPRSize = FuncInfo->getVarArgsFPRSize();
3558 SDValue VRTop, VRTopAddr;
3559 VRTopAddr = DAG.getNode(ISD::ADD, DL, getPointerTy(), VAList,
3560 DAG.getConstant(16, getPointerTy()));
3562 VRTop = DAG.getFrameIndex(FuncInfo->getVarArgsFPRIndex(), getPointerTy());
3563 VRTop = DAG.getNode(ISD::ADD, DL, getPointerTy(), VRTop,
3564 DAG.getConstant(FPRSize, getPointerTy()));
3566 MemOps.push_back(DAG.getStore(Chain, DL, VRTop, VRTopAddr,
3567 MachinePointerInfo(SV, 16), false, false, 8));
3570 // int __gr_offs at offset 24
3571 SDValue GROffsAddr = DAG.getNode(ISD::ADD, DL, getPointerTy(), VAList,
3572 DAG.getConstant(24, getPointerTy()));
3573 MemOps.push_back(DAG.getStore(Chain, DL, DAG.getConstant(-GPRSize, MVT::i32),
3574 GROffsAddr, MachinePointerInfo(SV, 24), false,
3577 // int __vr_offs at offset 28
3578 SDValue VROffsAddr = DAG.getNode(ISD::ADD, DL, getPointerTy(), VAList,
3579 DAG.getConstant(28, getPointerTy()));
3580 MemOps.push_back(DAG.getStore(Chain, DL, DAG.getConstant(-FPRSize, MVT::i32),
3581 VROffsAddr, MachinePointerInfo(SV, 28), false,
3584 return DAG.getNode(ISD::TokenFactor, DL, MVT::Other, MemOps);
3587 SDValue AArch64TargetLowering::LowerVASTART(SDValue Op,
3588 SelectionDAG &DAG) const {
3589 return Subtarget->isTargetDarwin() ? LowerDarwin_VASTART(Op, DAG)
3590 : LowerAAPCS_VASTART(Op, DAG);
3593 SDValue AArch64TargetLowering::LowerVACOPY(SDValue Op,
3594 SelectionDAG &DAG) const {
3595 // AAPCS has three pointers and two ints (= 32 bytes), Darwin has single
3597 unsigned VaListSize = Subtarget->isTargetDarwin() ? 8 : 32;
3598 const Value *DestSV = cast<SrcValueSDNode>(Op.getOperand(3))->getValue();
3599 const Value *SrcSV = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
3601 return DAG.getMemcpy(Op.getOperand(0), SDLoc(Op), Op.getOperand(1),
3602 Op.getOperand(2), DAG.getConstant(VaListSize, MVT::i32),
3603 8, false, false, MachinePointerInfo(DestSV),
3604 MachinePointerInfo(SrcSV));
3607 SDValue AArch64TargetLowering::LowerVAARG(SDValue Op, SelectionDAG &DAG) const {
3608 assert(Subtarget->isTargetDarwin() &&
3609 "automatic va_arg instruction only works on Darwin");
3611 const Value *V = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
3612 EVT VT = Op.getValueType();
3614 SDValue Chain = Op.getOperand(0);
3615 SDValue Addr = Op.getOperand(1);
3616 unsigned Align = Op.getConstantOperandVal(3);
3618 SDValue VAList = DAG.getLoad(getPointerTy(), DL, Chain, Addr,
3619 MachinePointerInfo(V), false, false, false, 0);
3620 Chain = VAList.getValue(1);
3623 assert(((Align & (Align - 1)) == 0) && "Expected Align to be a power of 2");
3624 VAList = DAG.getNode(ISD::ADD, DL, getPointerTy(), VAList,
3625 DAG.getConstant(Align - 1, getPointerTy()));
3626 VAList = DAG.getNode(ISD::AND, DL, getPointerTy(), VAList,
3627 DAG.getConstant(-(int64_t)Align, getPointerTy()));
3630 Type *ArgTy = VT.getTypeForEVT(*DAG.getContext());
3631 uint64_t ArgSize = getDataLayout()->getTypeAllocSize(ArgTy);
3633 // Scalar integer and FP values smaller than 64 bits are implicitly extended
3634 // up to 64 bits. At the very least, we have to increase the striding of the
3635 // vaargs list to match this, and for FP values we need to introduce
3636 // FP_ROUND nodes as well.
3637 if (VT.isInteger() && !VT.isVector())
3639 bool NeedFPTrunc = false;
3640 if (VT.isFloatingPoint() && !VT.isVector() && VT != MVT::f64) {
3645 // Increment the pointer, VAList, to the next vaarg
3646 SDValue VANext = DAG.getNode(ISD::ADD, DL, getPointerTy(), VAList,
3647 DAG.getConstant(ArgSize, getPointerTy()));
3648 // Store the incremented VAList to the legalized pointer
3649 SDValue APStore = DAG.getStore(Chain, DL, VANext, Addr, MachinePointerInfo(V),
3652 // Load the actual argument out of the pointer VAList
3654 // Load the value as an f64.
3655 SDValue WideFP = DAG.getLoad(MVT::f64, DL, APStore, VAList,
3656 MachinePointerInfo(), false, false, false, 0);
3657 // Round the value down to an f32.
3658 SDValue NarrowFP = DAG.getNode(ISD::FP_ROUND, DL, VT, WideFP.getValue(0),
3659 DAG.getIntPtrConstant(1));
3660 SDValue Ops[] = { NarrowFP, WideFP.getValue(1) };
3661 // Merge the rounded value with the chain output of the load.
3662 return DAG.getMergeValues(Ops, DL);
3665 return DAG.getLoad(VT, DL, APStore, VAList, MachinePointerInfo(), false,
3669 SDValue AArch64TargetLowering::LowerFRAMEADDR(SDValue Op,
3670 SelectionDAG &DAG) const {
3671 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
3672 MFI->setFrameAddressIsTaken(true);
3674 EVT VT = Op.getValueType();
3676 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
3678 DAG.getCopyFromReg(DAG.getEntryNode(), DL, AArch64::FP, VT);
3680 FrameAddr = DAG.getLoad(VT, DL, DAG.getEntryNode(), FrameAddr,
3681 MachinePointerInfo(), false, false, false, 0);
3685 // FIXME? Maybe this could be a TableGen attribute on some registers and
3686 // this table could be generated automatically from RegInfo.
3687 unsigned AArch64TargetLowering::getRegisterByName(const char* RegName,
3689 unsigned Reg = StringSwitch<unsigned>(RegName)
3690 .Case("sp", AArch64::SP)
3694 report_fatal_error("Invalid register name global variable");
3697 SDValue AArch64TargetLowering::LowerRETURNADDR(SDValue Op,
3698 SelectionDAG &DAG) const {
3699 MachineFunction &MF = DAG.getMachineFunction();
3700 MachineFrameInfo *MFI = MF.getFrameInfo();
3701 MFI->setReturnAddressIsTaken(true);
3703 EVT VT = Op.getValueType();
3705 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
3707 SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
3708 SDValue Offset = DAG.getConstant(8, getPointerTy());
3709 return DAG.getLoad(VT, DL, DAG.getEntryNode(),
3710 DAG.getNode(ISD::ADD, DL, VT, FrameAddr, Offset),
3711 MachinePointerInfo(), false, false, false, 0);
3714 // Return LR, which contains the return address. Mark it an implicit live-in.
3715 unsigned Reg = MF.addLiveIn(AArch64::LR, &AArch64::GPR64RegClass);
3716 return DAG.getCopyFromReg(DAG.getEntryNode(), DL, Reg, VT);
3719 /// LowerShiftRightParts - Lower SRA_PARTS, which returns two
3720 /// i64 values and take a 2 x i64 value to shift plus a shift amount.
3721 SDValue AArch64TargetLowering::LowerShiftRightParts(SDValue Op,
3722 SelectionDAG &DAG) const {
3723 assert(Op.getNumOperands() == 3 && "Not a double-shift!");
3724 EVT VT = Op.getValueType();
3725 unsigned VTBits = VT.getSizeInBits();
3727 SDValue ShOpLo = Op.getOperand(0);
3728 SDValue ShOpHi = Op.getOperand(1);
3729 SDValue ShAmt = Op.getOperand(2);
3731 unsigned Opc = (Op.getOpcode() == ISD::SRA_PARTS) ? ISD::SRA : ISD::SRL;
3733 assert(Op.getOpcode() == ISD::SRA_PARTS || Op.getOpcode() == ISD::SRL_PARTS);
3735 SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i64,
3736 DAG.getConstant(VTBits, MVT::i64), ShAmt);
3737 SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, ShAmt);
3738 SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i64, ShAmt,
3739 DAG.getConstant(VTBits, MVT::i64));
3740 SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, RevShAmt);
3742 SDValue Cmp = emitComparison(ExtraShAmt, DAG.getConstant(0, MVT::i64),
3743 ISD::SETGE, dl, DAG);
3744 SDValue CCVal = DAG.getConstant(AArch64CC::GE, MVT::i32);
3746 SDValue FalseValLo = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
3747 SDValue TrueValLo = DAG.getNode(Opc, dl, VT, ShOpHi, ExtraShAmt);
3749 DAG.getNode(AArch64ISD::CSEL, dl, VT, TrueValLo, FalseValLo, CCVal, Cmp);
3751 // AArch64 shifts larger than the register width are wrapped rather than
3752 // clamped, so we can't just emit "hi >> x".
3753 SDValue FalseValHi = DAG.getNode(Opc, dl, VT, ShOpHi, ShAmt);
3754 SDValue TrueValHi = Opc == ISD::SRA
3755 ? DAG.getNode(Opc, dl, VT, ShOpHi,
3756 DAG.getConstant(VTBits - 1, MVT::i64))
3757 : DAG.getConstant(0, VT);
3759 DAG.getNode(AArch64ISD::CSEL, dl, VT, TrueValHi, FalseValHi, CCVal, Cmp);
3761 SDValue Ops[2] = { Lo, Hi };
3762 return DAG.getMergeValues(Ops, dl);
3765 /// LowerShiftLeftParts - Lower SHL_PARTS, which returns two
3766 /// i64 values and take a 2 x i64 value to shift plus a shift amount.
3767 SDValue AArch64TargetLowering::LowerShiftLeftParts(SDValue Op,
3768 SelectionDAG &DAG) const {
3769 assert(Op.getNumOperands() == 3 && "Not a double-shift!");
3770 EVT VT = Op.getValueType();
3771 unsigned VTBits = VT.getSizeInBits();
3773 SDValue ShOpLo = Op.getOperand(0);
3774 SDValue ShOpHi = Op.getOperand(1);
3775 SDValue ShAmt = Op.getOperand(2);
3778 assert(Op.getOpcode() == ISD::SHL_PARTS);
3779 SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i64,
3780 DAG.getConstant(VTBits, MVT::i64), ShAmt);
3781 SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, RevShAmt);
3782 SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i64, ShAmt,
3783 DAG.getConstant(VTBits, MVT::i64));
3784 SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, ShAmt);
3785 SDValue Tmp3 = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ExtraShAmt);
3787 SDValue FalseVal = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
3789 SDValue Cmp = emitComparison(ExtraShAmt, DAG.getConstant(0, MVT::i64),
3790 ISD::SETGE, dl, DAG);
3791 SDValue CCVal = DAG.getConstant(AArch64CC::GE, MVT::i32);
3793 DAG.getNode(AArch64ISD::CSEL, dl, VT, Tmp3, FalseVal, CCVal, Cmp);
3795 // AArch64 shifts of larger than register sizes are wrapped rather than
3796 // clamped, so we can't just emit "lo << a" if a is too big.
3797 SDValue TrueValLo = DAG.getConstant(0, VT);
3798 SDValue FalseValLo = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ShAmt);
3800 DAG.getNode(AArch64ISD::CSEL, dl, VT, TrueValLo, FalseValLo, CCVal, Cmp);
3802 SDValue Ops[2] = { Lo, Hi };
3803 return DAG.getMergeValues(Ops, dl);
3806 bool AArch64TargetLowering::isOffsetFoldingLegal(
3807 const GlobalAddressSDNode *GA) const {
3808 // The AArch64 target doesn't support folding offsets into global addresses.
3812 bool AArch64TargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
3813 // We can materialize #0.0 as fmov $Rd, XZR for 64-bit and 32-bit cases.
3814 // FIXME: We should be able to handle f128 as well with a clever lowering.
3815 if (Imm.isPosZero() && (VT == MVT::f64 || VT == MVT::f32))
3819 return AArch64_AM::getFP64Imm(Imm) != -1;
3820 else if (VT == MVT::f32)
3821 return AArch64_AM::getFP32Imm(Imm) != -1;
3825 //===----------------------------------------------------------------------===//
3826 // AArch64 Optimization Hooks
3827 //===----------------------------------------------------------------------===//
3829 //===----------------------------------------------------------------------===//
3830 // AArch64 Inline Assembly Support
3831 //===----------------------------------------------------------------------===//
3833 // Table of Constraints
3834 // TODO: This is the current set of constraints supported by ARM for the
3835 // compiler, not all of them may make sense, e.g. S may be difficult to support.
3837 // r - A general register
3838 // w - An FP/SIMD register of some size in the range v0-v31
3839 // x - An FP/SIMD register of some size in the range v0-v15
3840 // I - Constant that can be used with an ADD instruction
3841 // J - Constant that can be used with a SUB instruction
3842 // K - Constant that can be used with a 32-bit logical instruction
3843 // L - Constant that can be used with a 64-bit logical instruction
3844 // M - Constant that can be used as a 32-bit MOV immediate
3845 // N - Constant that can be used as a 64-bit MOV immediate
3846 // Q - A memory reference with base register and no offset
3847 // S - A symbolic address
3848 // Y - Floating point constant zero
3849 // Z - Integer constant zero
3851 // Note that general register operands will be output using their 64-bit x
3852 // register name, whatever the size of the variable, unless the asm operand
3853 // is prefixed by the %w modifier. Floating-point and SIMD register operands
3854 // will be output with the v prefix unless prefixed by the %b, %h, %s, %d or
3857 /// getConstraintType - Given a constraint letter, return the type of
3858 /// constraint it is for this target.
3859 AArch64TargetLowering::ConstraintType
3860 AArch64TargetLowering::getConstraintType(const std::string &Constraint) const {
3861 if (Constraint.size() == 1) {
3862 switch (Constraint[0]) {
3869 return C_RegisterClass;
3870 // An address with a single base register. Due to the way we
3871 // currently handle addresses it is the same as 'r'.
3876 return TargetLowering::getConstraintType(Constraint);
3879 /// Examine constraint type and operand type and determine a weight value.
3880 /// This object must already have been set up with the operand type
3881 /// and the current alternative constraint selected.
3882 TargetLowering::ConstraintWeight
3883 AArch64TargetLowering::getSingleConstraintMatchWeight(
3884 AsmOperandInfo &info, const char *constraint) const {
3885 ConstraintWeight weight = CW_Invalid;
3886 Value *CallOperandVal = info.CallOperandVal;
3887 // If we don't have a value, we can't do a match,
3888 // but allow it at the lowest weight.
3889 if (!CallOperandVal)
3891 Type *type = CallOperandVal->getType();
3892 // Look at the constraint type.
3893 switch (*constraint) {
3895 weight = TargetLowering::getSingleConstraintMatchWeight(info, constraint);
3899 if (type->isFloatingPointTy() || type->isVectorTy())
3900 weight = CW_Register;
3903 weight = CW_Constant;
3909 std::pair<unsigned, const TargetRegisterClass *>
3910 AArch64TargetLowering::getRegForInlineAsmConstraint(
3911 const std::string &Constraint, MVT VT) const {
3912 if (Constraint.size() == 1) {
3913 switch (Constraint[0]) {
3915 if (VT.getSizeInBits() == 64)
3916 return std::make_pair(0U, &AArch64::GPR64commonRegClass);
3917 return std::make_pair(0U, &AArch64::GPR32commonRegClass);
3920 return std::make_pair(0U, &AArch64::FPR32RegClass);
3921 if (VT.getSizeInBits() == 64)
3922 return std::make_pair(0U, &AArch64::FPR64RegClass);
3923 if (VT.getSizeInBits() == 128)
3924 return std::make_pair(0U, &AArch64::FPR128RegClass);
3926 // The instructions that this constraint is designed for can
3927 // only take 128-bit registers so just use that regclass.
3929 if (VT.getSizeInBits() == 128)
3930 return std::make_pair(0U, &AArch64::FPR128_loRegClass);
3934 if (StringRef("{cc}").equals_lower(Constraint))
3935 return std::make_pair(unsigned(AArch64::NZCV), &AArch64::CCRRegClass);
3937 // Use the default implementation in TargetLowering to convert the register
3938 // constraint into a member of a register class.
3939 std::pair<unsigned, const TargetRegisterClass *> Res;
3940 Res = TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
3942 // Not found as a standard register?
3944 unsigned Size = Constraint.size();
3945 if ((Size == 4 || Size == 5) && Constraint[0] == '{' &&
3946 tolower(Constraint[1]) == 'v' && Constraint[Size - 1] == '}') {
3947 const std::string Reg =
3948 std::string(&Constraint[2], &Constraint[Size - 1]);
3949 int RegNo = atoi(Reg.c_str());
3950 if (RegNo >= 0 && RegNo <= 31) {
3951 // v0 - v31 are aliases of q0 - q31.
3952 // By default we'll emit v0-v31 for this unless there's a modifier where
3953 // we'll emit the correct register as well.
3954 Res.first = AArch64::FPR128RegClass.getRegister(RegNo);
3955 Res.second = &AArch64::FPR128RegClass;
3963 /// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
3964 /// vector. If it is invalid, don't add anything to Ops.
3965 void AArch64TargetLowering::LowerAsmOperandForConstraint(
3966 SDValue Op, std::string &Constraint, std::vector<SDValue> &Ops,
3967 SelectionDAG &DAG) const {
3970 // Currently only support length 1 constraints.
3971 if (Constraint.length() != 1)
3974 char ConstraintLetter = Constraint[0];
3975 switch (ConstraintLetter) {
3979 // This set of constraints deal with valid constants for various instructions.
3980 // Validate and return a target constant for them if we can.
3982 // 'z' maps to xzr or wzr so it needs an input of 0.
3983 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
3984 if (!C || C->getZExtValue() != 0)
3987 if (Op.getValueType() == MVT::i64)
3988 Result = DAG.getRegister(AArch64::XZR, MVT::i64);
3990 Result = DAG.getRegister(AArch64::WZR, MVT::i32);
4000 ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
4004 // Grab the value and do some validation.
4005 uint64_t CVal = C->getZExtValue();
4006 switch (ConstraintLetter) {
4007 // The I constraint applies only to simple ADD or SUB immediate operands:
4008 // i.e. 0 to 4095 with optional shift by 12
4009 // The J constraint applies only to ADD or SUB immediates that would be
4010 // valid when negated, i.e. if [an add pattern] were to be output as a SUB
4011 // instruction [or vice versa], in other words -1 to -4095 with optional
4012 // left shift by 12.
4014 if (isUInt<12>(CVal) || isShiftedUInt<12, 12>(CVal))
4018 uint64_t NVal = -C->getSExtValue();
4019 if (isUInt<12>(NVal) || isShiftedUInt<12, 12>(NVal))
4023 // The K and L constraints apply *only* to logical immediates, including
4024 // what used to be the MOVI alias for ORR (though the MOVI alias has now
4025 // been removed and MOV should be used). So these constraints have to
4026 // distinguish between bit patterns that are valid 32-bit or 64-bit
4027 // "bitmask immediates": for example 0xaaaaaaaa is a valid bimm32 (K), but
4028 // not a valid bimm64 (L) where 0xaaaaaaaaaaaaaaaa would be valid, and vice
4031 if (AArch64_AM::isLogicalImmediate(CVal, 32))
4035 if (AArch64_AM::isLogicalImmediate(CVal, 64))
4038 // The M and N constraints are a superset of K and L respectively, for use
4039 // with the MOV (immediate) alias. As well as the logical immediates they
4040 // also match 32 or 64-bit immediates that can be loaded either using a
4041 // *single* MOVZ or MOVN , such as 32-bit 0x12340000, 0x00001234, 0xffffedca
4042 // (M) or 64-bit 0x1234000000000000 (N) etc.
4043 // As a note some of this code is liberally stolen from the asm parser.
4045 if (!isUInt<32>(CVal))
4047 if (AArch64_AM::isLogicalImmediate(CVal, 32))
4049 if ((CVal & 0xFFFF) == CVal)
4051 if ((CVal & 0xFFFF0000ULL) == CVal)
4053 uint64_t NCVal = ~(uint32_t)CVal;
4054 if ((NCVal & 0xFFFFULL) == NCVal)
4056 if ((NCVal & 0xFFFF0000ULL) == NCVal)
4061 if (AArch64_AM::isLogicalImmediate(CVal, 64))
4063 if ((CVal & 0xFFFFULL) == CVal)
4065 if ((CVal & 0xFFFF0000ULL) == CVal)
4067 if ((CVal & 0xFFFF00000000ULL) == CVal)
4069 if ((CVal & 0xFFFF000000000000ULL) == CVal)
4071 uint64_t NCVal = ~CVal;
4072 if ((NCVal & 0xFFFFULL) == NCVal)
4074 if ((NCVal & 0xFFFF0000ULL) == NCVal)
4076 if ((NCVal & 0xFFFF00000000ULL) == NCVal)
4078 if ((NCVal & 0xFFFF000000000000ULL) == NCVal)
4086 // All assembler immediates are 64-bit integers.
4087 Result = DAG.getTargetConstant(CVal, MVT::i64);
4091 if (Result.getNode()) {
4092 Ops.push_back(Result);
4096 return TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, Ops, DAG);
4099 //===----------------------------------------------------------------------===//
4100 // AArch64 Advanced SIMD Support
4101 //===----------------------------------------------------------------------===//
4103 /// WidenVector - Given a value in the V64 register class, produce the
4104 /// equivalent value in the V128 register class.
4105 static SDValue WidenVector(SDValue V64Reg, SelectionDAG &DAG) {
4106 EVT VT = V64Reg.getValueType();
4107 unsigned NarrowSize = VT.getVectorNumElements();
4108 MVT EltTy = VT.getVectorElementType().getSimpleVT();
4109 MVT WideTy = MVT::getVectorVT(EltTy, 2 * NarrowSize);
4112 return DAG.getNode(ISD::INSERT_SUBVECTOR, DL, WideTy, DAG.getUNDEF(WideTy),
4113 V64Reg, DAG.getConstant(0, MVT::i32));
4116 /// getExtFactor - Determine the adjustment factor for the position when
4117 /// generating an "extract from vector registers" instruction.
4118 static unsigned getExtFactor(SDValue &V) {
4119 EVT EltType = V.getValueType().getVectorElementType();
4120 return EltType.getSizeInBits() / 8;
4123 /// NarrowVector - Given a value in the V128 register class, produce the
4124 /// equivalent value in the V64 register class.
4125 static SDValue NarrowVector(SDValue V128Reg, SelectionDAG &DAG) {
4126 EVT VT = V128Reg.getValueType();
4127 unsigned WideSize = VT.getVectorNumElements();
4128 MVT EltTy = VT.getVectorElementType().getSimpleVT();
4129 MVT NarrowTy = MVT::getVectorVT(EltTy, WideSize / 2);
4132 return DAG.getTargetExtractSubreg(AArch64::dsub, DL, NarrowTy, V128Reg);
4135 // Gather data to see if the operation can be modelled as a
4136 // shuffle in combination with VEXTs.
4137 SDValue AArch64TargetLowering::ReconstructShuffle(SDValue Op,
4138 SelectionDAG &DAG) const {
4139 assert(Op.getOpcode() == ISD::BUILD_VECTOR && "Unknown opcode!");
4141 EVT VT = Op.getValueType();
4142 unsigned NumElts = VT.getVectorNumElements();
4144 SmallVector<SDValue, 2> SourceVecs;
4145 SmallVector<unsigned, 2> MinElts;
4146 SmallVector<unsigned, 2> MaxElts;
4148 for (unsigned i = 0; i < NumElts; ++i) {
4149 SDValue V = Op.getOperand(i);
4150 if (V.getOpcode() == ISD::UNDEF)
4152 else if (V.getOpcode() != ISD::EXTRACT_VECTOR_ELT) {
4153 // A shuffle can only come from building a vector from various
4154 // elements of other vectors.
4158 // Record this extraction against the appropriate vector if possible...
4159 SDValue SourceVec = V.getOperand(0);
4160 unsigned EltNo = cast<ConstantSDNode>(V.getOperand(1))->getZExtValue();
4161 bool FoundSource = false;
4162 for (unsigned j = 0; j < SourceVecs.size(); ++j) {
4163 if (SourceVecs[j] == SourceVec) {
4164 if (MinElts[j] > EltNo)
4166 if (MaxElts[j] < EltNo)
4173 // Or record a new source if not...
4175 SourceVecs.push_back(SourceVec);
4176 MinElts.push_back(EltNo);
4177 MaxElts.push_back(EltNo);
4181 // Currently only do something sane when at most two source vectors
4183 if (SourceVecs.size() > 2)
4186 SDValue ShuffleSrcs[2] = { DAG.getUNDEF(VT), DAG.getUNDEF(VT) };
4187 int VEXTOffsets[2] = { 0, 0 };
4188 int OffsetMultipliers[2] = { 1, 1 };
4190 // This loop extracts the usage patterns of the source vectors
4191 // and prepares appropriate SDValues for a shuffle if possible.
4192 for (unsigned i = 0; i < SourceVecs.size(); ++i) {
4193 unsigned NumSrcElts = SourceVecs[i].getValueType().getVectorNumElements();
4194 SDValue CurSource = SourceVecs[i];
4195 if (SourceVecs[i].getValueType().getVectorElementType() !=
4196 VT.getVectorElementType()) {
4197 // It may hit this case if SourceVecs[i] is AssertSext/AssertZext.
4198 // Then bitcast it to the vector which holds asserted element type,
4199 // and record the multiplier of element width between SourceVecs and
4200 // Build_vector which is needed to extract the correct lanes later.
4202 EVT::getVectorVT(*DAG.getContext(), VT.getVectorElementType(),
4203 SourceVecs[i].getValueSizeInBits() /
4204 VT.getVectorElementType().getSizeInBits());
4206 CurSource = DAG.getNode(ISD::BITCAST, dl, CastVT, SourceVecs[i]);
4207 OffsetMultipliers[i] = CastVT.getVectorNumElements() / NumSrcElts;
4208 NumSrcElts *= OffsetMultipliers[i];
4209 MaxElts[i] *= OffsetMultipliers[i];
4210 MinElts[i] *= OffsetMultipliers[i];
4213 if (CurSource.getValueType() == VT) {
4214 // No VEXT necessary
4215 ShuffleSrcs[i] = CurSource;
4218 } else if (NumSrcElts < NumElts) {
4219 // We can pad out the smaller vector for free, so if it's part of a
4221 ShuffleSrcs[i] = DAG.getNode(ISD::CONCAT_VECTORS, dl, VT, CurSource,
4222 DAG.getUNDEF(CurSource.getValueType()));
4226 // Since only 64-bit and 128-bit vectors are legal on ARM and
4227 // we've eliminated the other cases...
4228 assert(NumSrcElts == 2 * NumElts &&
4229 "unexpected vector sizes in ReconstructShuffle");
4231 if (MaxElts[i] - MinElts[i] >= NumElts) {
4232 // Span too large for a VEXT to cope
4236 if (MinElts[i] >= NumElts) {
4237 // The extraction can just take the second half
4238 VEXTOffsets[i] = NumElts;
4239 ShuffleSrcs[i] = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT, CurSource,
4240 DAG.getIntPtrConstant(NumElts));
4241 } else if (MaxElts[i] < NumElts) {
4242 // The extraction can just take the first half
4244 ShuffleSrcs[i] = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT, CurSource,
4245 DAG.getIntPtrConstant(0));
4247 // An actual VEXT is needed
4248 VEXTOffsets[i] = MinElts[i];
4249 SDValue VEXTSrc1 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT, CurSource,
4250 DAG.getIntPtrConstant(0));
4251 SDValue VEXTSrc2 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT, CurSource,
4252 DAG.getIntPtrConstant(NumElts));
4253 unsigned Imm = VEXTOffsets[i] * getExtFactor(VEXTSrc1);
4254 ShuffleSrcs[i] = DAG.getNode(AArch64ISD::EXT, dl, VT, VEXTSrc1, VEXTSrc2,
4255 DAG.getConstant(Imm, MVT::i32));
4259 SmallVector<int, 8> Mask;
4261 for (unsigned i = 0; i < NumElts; ++i) {
4262 SDValue Entry = Op.getOperand(i);
4263 if (Entry.getOpcode() == ISD::UNDEF) {
4268 SDValue ExtractVec = Entry.getOperand(0);
4270 cast<ConstantSDNode>(Op.getOperand(i).getOperand(1))->getSExtValue();
4271 if (ExtractVec == SourceVecs[0]) {
4272 Mask.push_back(ExtractElt * OffsetMultipliers[0] - VEXTOffsets[0]);
4274 Mask.push_back(ExtractElt * OffsetMultipliers[1] + NumElts -
4279 // Final check before we try to produce nonsense...
4280 if (isShuffleMaskLegal(Mask, VT))
4281 return DAG.getVectorShuffle(VT, dl, ShuffleSrcs[0], ShuffleSrcs[1],
4287 // check if an EXT instruction can handle the shuffle mask when the
4288 // vector sources of the shuffle are the same.
4289 static bool isSingletonEXTMask(ArrayRef<int> M, EVT VT, unsigned &Imm) {
4290 unsigned NumElts = VT.getVectorNumElements();
4292 // Assume that the first shuffle index is not UNDEF. Fail if it is.
4298 // If this is a VEXT shuffle, the immediate value is the index of the first
4299 // element. The other shuffle indices must be the successive elements after
4301 unsigned ExpectedElt = Imm;
4302 for (unsigned i = 1; i < NumElts; ++i) {
4303 // Increment the expected index. If it wraps around, just follow it
4304 // back to index zero and keep going.
4306 if (ExpectedElt == NumElts)
4310 continue; // ignore UNDEF indices
4311 if (ExpectedElt != static_cast<unsigned>(M[i]))
4318 // check if an EXT instruction can handle the shuffle mask when the
4319 // vector sources of the shuffle are different.
4320 static bool isEXTMask(ArrayRef<int> M, EVT VT, bool &ReverseEXT,
4322 // Look for the first non-undef element.
4323 const int *FirstRealElt = std::find_if(M.begin(), M.end(),
4324 [](int Elt) {return Elt >= 0;});
4326 // Benefit form APInt to handle overflow when calculating expected element.
4327 unsigned NumElts = VT.getVectorNumElements();
4328 unsigned MaskBits = APInt(32, NumElts * 2).logBase2();
4329 APInt ExpectedElt = APInt(MaskBits, *FirstRealElt + 1);
4330 // The following shuffle indices must be the successive elements after the
4331 // first real element.
4332 const int *FirstWrongElt = std::find_if(FirstRealElt + 1, M.end(),
4333 [&](int Elt) {return Elt != ExpectedElt++ && Elt != -1;});
4334 if (FirstWrongElt != M.end())
4337 // The index of an EXT is the first element if it is not UNDEF.
4338 // Watch out for the beginning UNDEFs. The EXT index should be the expected
4339 // value of the first element. E.g.
4340 // <-1, -1, 3, ...> is treated as <1, 2, 3, ...>.
4341 // <-1, -1, 0, 1, ...> is treated as <2*NumElts-2, 2*NumElts-1, 0, 1, ...>.
4342 // ExpectedElt is the last mask index plus 1.
4343 Imm = ExpectedElt.getZExtValue();
4345 // There are two difference cases requiring to reverse input vectors.
4346 // For example, for vector <4 x i32> we have the following cases,
4347 // Case 1: shufflevector(<4 x i32>,<4 x i32>,<-1, -1, -1, 0>)
4348 // Case 2: shufflevector(<4 x i32>,<4 x i32>,<-1, -1, 7, 0>)
4349 // For both cases, we finally use mask <5, 6, 7, 0>, which requires
4350 // to reverse two input vectors.
4359 /// isREVMask - Check if a vector shuffle corresponds to a REV
4360 /// instruction with the specified blocksize. (The order of the elements
4361 /// within each block of the vector is reversed.)
4362 static bool isREVMask(ArrayRef<int> M, EVT VT, unsigned BlockSize) {
4363 assert((BlockSize == 16 || BlockSize == 32 || BlockSize == 64) &&
4364 "Only possible block sizes for REV are: 16, 32, 64");
4366 unsigned EltSz = VT.getVectorElementType().getSizeInBits();
4370 unsigned NumElts = VT.getVectorNumElements();
4371 unsigned BlockElts = M[0] + 1;
4372 // If the first shuffle index is UNDEF, be optimistic.
4374 BlockElts = BlockSize / EltSz;
4376 if (BlockSize <= EltSz || BlockSize != BlockElts * EltSz)
4379 for (unsigned i = 0; i < NumElts; ++i) {
4381 continue; // ignore UNDEF indices
4382 if ((unsigned)M[i] != (i - i % BlockElts) + (BlockElts - 1 - i % BlockElts))
4389 static bool isZIPMask(ArrayRef<int> M, EVT VT, unsigned &WhichResult) {
4390 unsigned NumElts = VT.getVectorNumElements();
4391 WhichResult = (M[0] == 0 ? 0 : 1);
4392 unsigned Idx = WhichResult * NumElts / 2;
4393 for (unsigned i = 0; i != NumElts; i += 2) {
4394 if ((M[i] >= 0 && (unsigned)M[i] != Idx) ||
4395 (M[i + 1] >= 0 && (unsigned)M[i + 1] != Idx + NumElts))
4403 static bool isUZPMask(ArrayRef<int> M, EVT VT, unsigned &WhichResult) {
4404 unsigned NumElts = VT.getVectorNumElements();
4405 WhichResult = (M[0] == 0 ? 0 : 1);
4406 for (unsigned i = 0; i != NumElts; ++i) {
4408 continue; // ignore UNDEF indices
4409 if ((unsigned)M[i] != 2 * i + WhichResult)
4416 static bool isTRNMask(ArrayRef<int> M, EVT VT, unsigned &WhichResult) {
4417 unsigned NumElts = VT.getVectorNumElements();
4418 WhichResult = (M[0] == 0 ? 0 : 1);
4419 for (unsigned i = 0; i < NumElts; i += 2) {
4420 if ((M[i] >= 0 && (unsigned)M[i] != i + WhichResult) ||
4421 (M[i + 1] >= 0 && (unsigned)M[i + 1] != i + NumElts + WhichResult))
4427 /// isZIP_v_undef_Mask - Special case of isZIPMask for canonical form of
4428 /// "vector_shuffle v, v", i.e., "vector_shuffle v, undef".
4429 /// Mask is e.g., <0, 0, 1, 1> instead of <0, 4, 1, 5>.
4430 static bool isZIP_v_undef_Mask(ArrayRef<int> M, EVT VT, unsigned &WhichResult) {
4431 unsigned NumElts = VT.getVectorNumElements();
4432 WhichResult = (M[0] == 0 ? 0 : 1);
4433 unsigned Idx = WhichResult * NumElts / 2;
4434 for (unsigned i = 0; i != NumElts; i += 2) {
4435 if ((M[i] >= 0 && (unsigned)M[i] != Idx) ||
4436 (M[i + 1] >= 0 && (unsigned)M[i + 1] != Idx))
4444 /// isUZP_v_undef_Mask - Special case of isUZPMask for canonical form of
4445 /// "vector_shuffle v, v", i.e., "vector_shuffle v, undef".
4446 /// Mask is e.g., <0, 2, 0, 2> instead of <0, 2, 4, 6>,
4447 static bool isUZP_v_undef_Mask(ArrayRef<int> M, EVT VT, unsigned &WhichResult) {
4448 unsigned Half = VT.getVectorNumElements() / 2;
4449 WhichResult = (M[0] == 0 ? 0 : 1);
4450 for (unsigned j = 0; j != 2; ++j) {
4451 unsigned Idx = WhichResult;
4452 for (unsigned i = 0; i != Half; ++i) {
4453 int MIdx = M[i + j * Half];
4454 if (MIdx >= 0 && (unsigned)MIdx != Idx)
4463 /// isTRN_v_undef_Mask - Special case of isTRNMask for canonical form of
4464 /// "vector_shuffle v, v", i.e., "vector_shuffle v, undef".
4465 /// Mask is e.g., <0, 0, 2, 2> instead of <0, 4, 2, 6>.
4466 static bool isTRN_v_undef_Mask(ArrayRef<int> M, EVT VT, unsigned &WhichResult) {
4467 unsigned NumElts = VT.getVectorNumElements();
4468 WhichResult = (M[0] == 0 ? 0 : 1);
4469 for (unsigned i = 0; i < NumElts; i += 2) {
4470 if ((M[i] >= 0 && (unsigned)M[i] != i + WhichResult) ||
4471 (M[i + 1] >= 0 && (unsigned)M[i + 1] != i + WhichResult))
4477 static bool isINSMask(ArrayRef<int> M, int NumInputElements,
4478 bool &DstIsLeft, int &Anomaly) {
4479 if (M.size() != static_cast<size_t>(NumInputElements))
4482 int NumLHSMatch = 0, NumRHSMatch = 0;
4483 int LastLHSMismatch = -1, LastRHSMismatch = -1;
4485 for (int i = 0; i < NumInputElements; ++i) {
4495 LastLHSMismatch = i;
4497 if (M[i] == i + NumInputElements)
4500 LastRHSMismatch = i;
4503 if (NumLHSMatch == NumInputElements - 1) {
4505 Anomaly = LastLHSMismatch;
4507 } else if (NumRHSMatch == NumInputElements - 1) {
4509 Anomaly = LastRHSMismatch;
4516 static bool isConcatMask(ArrayRef<int> Mask, EVT VT, bool SplitLHS) {
4517 if (VT.getSizeInBits() != 128)
4520 unsigned NumElts = VT.getVectorNumElements();
4522 for (int I = 0, E = NumElts / 2; I != E; I++) {
4527 int Offset = NumElts / 2;
4528 for (int I = NumElts / 2, E = NumElts; I != E; I++) {
4529 if (Mask[I] != I + SplitLHS * Offset)
4536 static SDValue tryFormConcatFromShuffle(SDValue Op, SelectionDAG &DAG) {
4538 EVT VT = Op.getValueType();
4539 SDValue V0 = Op.getOperand(0);
4540 SDValue V1 = Op.getOperand(1);
4541 ArrayRef<int> Mask = cast<ShuffleVectorSDNode>(Op)->getMask();
4543 if (VT.getVectorElementType() != V0.getValueType().getVectorElementType() ||
4544 VT.getVectorElementType() != V1.getValueType().getVectorElementType())
4547 bool SplitV0 = V0.getValueType().getSizeInBits() == 128;
4549 if (!isConcatMask(Mask, VT, SplitV0))
4552 EVT CastVT = EVT::getVectorVT(*DAG.getContext(), VT.getVectorElementType(),
4553 VT.getVectorNumElements() / 2);
4555 V0 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, CastVT, V0,
4556 DAG.getConstant(0, MVT::i64));
4558 if (V1.getValueType().getSizeInBits() == 128) {
4559 V1 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, CastVT, V1,
4560 DAG.getConstant(0, MVT::i64));
4562 return DAG.getNode(ISD::CONCAT_VECTORS, DL, VT, V0, V1);
4565 /// GeneratePerfectShuffle - Given an entry in the perfect-shuffle table, emit
4566 /// the specified operations to build the shuffle.
4567 static SDValue GeneratePerfectShuffle(unsigned PFEntry, SDValue LHS,
4568 SDValue RHS, SelectionDAG &DAG,
4570 unsigned OpNum = (PFEntry >> 26) & 0x0F;
4571 unsigned LHSID = (PFEntry >> 13) & ((1 << 13) - 1);
4572 unsigned RHSID = (PFEntry >> 0) & ((1 << 13) - 1);
4575 OP_COPY = 0, // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3>
4584 OP_VUZPL, // VUZP, left result
4585 OP_VUZPR, // VUZP, right result
4586 OP_VZIPL, // VZIP, left result
4587 OP_VZIPR, // VZIP, right result
4588 OP_VTRNL, // VTRN, left result
4589 OP_VTRNR // VTRN, right result
4592 if (OpNum == OP_COPY) {
4593 if (LHSID == (1 * 9 + 2) * 9 + 3)
4595 assert(LHSID == ((4 * 9 + 5) * 9 + 6) * 9 + 7 && "Illegal OP_COPY!");
4599 SDValue OpLHS, OpRHS;
4600 OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG, dl);
4601 OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG, dl);
4602 EVT VT = OpLHS.getValueType();
4606 llvm_unreachable("Unknown shuffle opcode!");
4608 // VREV divides the vector in half and swaps within the half.
4609 if (VT.getVectorElementType() == MVT::i32 ||
4610 VT.getVectorElementType() == MVT::f32)
4611 return DAG.getNode(AArch64ISD::REV64, dl, VT, OpLHS);
4612 // vrev <4 x i16> -> REV32
4613 if (VT.getVectorElementType() == MVT::i16)
4614 return DAG.getNode(AArch64ISD::REV32, dl, VT, OpLHS);
4615 // vrev <4 x i8> -> REV16
4616 assert(VT.getVectorElementType() == MVT::i8);
4617 return DAG.getNode(AArch64ISD::REV16, dl, VT, OpLHS);
4622 EVT EltTy = VT.getVectorElementType();
4624 if (EltTy == MVT::i8)
4625 Opcode = AArch64ISD::DUPLANE8;
4626 else if (EltTy == MVT::i16)
4627 Opcode = AArch64ISD::DUPLANE16;
4628 else if (EltTy == MVT::i32 || EltTy == MVT::f32)
4629 Opcode = AArch64ISD::DUPLANE32;
4630 else if (EltTy == MVT::i64 || EltTy == MVT::f64)
4631 Opcode = AArch64ISD::DUPLANE64;
4633 llvm_unreachable("Invalid vector element type?");
4635 if (VT.getSizeInBits() == 64)
4636 OpLHS = WidenVector(OpLHS, DAG);
4637 SDValue Lane = DAG.getConstant(OpNum - OP_VDUP0, MVT::i64);
4638 return DAG.getNode(Opcode, dl, VT, OpLHS, Lane);
4643 unsigned Imm = (OpNum - OP_VEXT1 + 1) * getExtFactor(OpLHS);
4644 return DAG.getNode(AArch64ISD::EXT, dl, VT, OpLHS, OpRHS,
4645 DAG.getConstant(Imm, MVT::i32));
4648 return DAG.getNode(AArch64ISD::UZP1, dl, DAG.getVTList(VT, VT), OpLHS,
4651 return DAG.getNode(AArch64ISD::UZP2, dl, DAG.getVTList(VT, VT), OpLHS,
4654 return DAG.getNode(AArch64ISD::ZIP1, dl, DAG.getVTList(VT, VT), OpLHS,
4657 return DAG.getNode(AArch64ISD::ZIP2, dl, DAG.getVTList(VT, VT), OpLHS,
4660 return DAG.getNode(AArch64ISD::TRN1, dl, DAG.getVTList(VT, VT), OpLHS,
4663 return DAG.getNode(AArch64ISD::TRN2, dl, DAG.getVTList(VT, VT), OpLHS,
4668 static SDValue GenerateTBL(SDValue Op, ArrayRef<int> ShuffleMask,
4669 SelectionDAG &DAG) {
4670 // Check to see if we can use the TBL instruction.
4671 SDValue V1 = Op.getOperand(0);
4672 SDValue V2 = Op.getOperand(1);
4675 EVT EltVT = Op.getValueType().getVectorElementType();
4676 unsigned BytesPerElt = EltVT.getSizeInBits() / 8;
4678 SmallVector<SDValue, 8> TBLMask;
4679 for (int Val : ShuffleMask) {
4680 for (unsigned Byte = 0; Byte < BytesPerElt; ++Byte) {
4681 unsigned Offset = Byte + Val * BytesPerElt;
4682 TBLMask.push_back(DAG.getConstant(Offset, MVT::i32));
4686 MVT IndexVT = MVT::v8i8;
4687 unsigned IndexLen = 8;
4688 if (Op.getValueType().getSizeInBits() == 128) {
4689 IndexVT = MVT::v16i8;
4693 SDValue V1Cst = DAG.getNode(ISD::BITCAST, DL, IndexVT, V1);
4694 SDValue V2Cst = DAG.getNode(ISD::BITCAST, DL, IndexVT, V2);
4697 if (V2.getNode()->getOpcode() == ISD::UNDEF) {
4699 V1Cst = DAG.getNode(ISD::CONCAT_VECTORS, DL, MVT::v16i8, V1Cst, V1Cst);
4700 Shuffle = DAG.getNode(
4701 ISD::INTRINSIC_WO_CHAIN, DL, IndexVT,
4702 DAG.getConstant(Intrinsic::aarch64_neon_tbl1, MVT::i32), V1Cst,
4703 DAG.getNode(ISD::BUILD_VECTOR, DL, IndexVT,
4704 makeArrayRef(TBLMask.data(), IndexLen)));
4706 if (IndexLen == 8) {
4707 V1Cst = DAG.getNode(ISD::CONCAT_VECTORS, DL, MVT::v16i8, V1Cst, V2Cst);
4708 Shuffle = DAG.getNode(
4709 ISD::INTRINSIC_WO_CHAIN, DL, IndexVT,
4710 DAG.getConstant(Intrinsic::aarch64_neon_tbl1, MVT::i32), V1Cst,
4711 DAG.getNode(ISD::BUILD_VECTOR, DL, IndexVT,
4712 makeArrayRef(TBLMask.data(), IndexLen)));
4714 // FIXME: We cannot, for the moment, emit a TBL2 instruction because we
4715 // cannot currently represent the register constraints on the input
4717 // Shuffle = DAG.getNode(AArch64ISD::TBL2, DL, IndexVT, V1Cst, V2Cst,
4718 // DAG.getNode(ISD::BUILD_VECTOR, DL, IndexVT,
4719 // &TBLMask[0], IndexLen));
4720 Shuffle = DAG.getNode(
4721 ISD::INTRINSIC_WO_CHAIN, DL, IndexVT,
4722 DAG.getConstant(Intrinsic::aarch64_neon_tbl2, MVT::i32), V1Cst, V2Cst,
4723 DAG.getNode(ISD::BUILD_VECTOR, DL, IndexVT,
4724 makeArrayRef(TBLMask.data(), IndexLen)));
4727 return DAG.getNode(ISD::BITCAST, DL, Op.getValueType(), Shuffle);
4730 static unsigned getDUPLANEOp(EVT EltType) {
4731 if (EltType == MVT::i8)
4732 return AArch64ISD::DUPLANE8;
4733 if (EltType == MVT::i16)
4734 return AArch64ISD::DUPLANE16;
4735 if (EltType == MVT::i32 || EltType == MVT::f32)
4736 return AArch64ISD::DUPLANE32;
4737 if (EltType == MVT::i64 || EltType == MVT::f64)
4738 return AArch64ISD::DUPLANE64;
4740 llvm_unreachable("Invalid vector element type?");
4743 SDValue AArch64TargetLowering::LowerVECTOR_SHUFFLE(SDValue Op,
4744 SelectionDAG &DAG) const {
4746 EVT VT = Op.getValueType();
4748 ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(Op.getNode());
4750 // Convert shuffles that are directly supported on NEON to target-specific
4751 // DAG nodes, instead of keeping them as shuffles and matching them again
4752 // during code selection. This is more efficient and avoids the possibility
4753 // of inconsistencies between legalization and selection.
4754 ArrayRef<int> ShuffleMask = SVN->getMask();
4756 SDValue V1 = Op.getOperand(0);
4757 SDValue V2 = Op.getOperand(1);
4759 if (ShuffleVectorSDNode::isSplatMask(&ShuffleMask[0],
4760 V1.getValueType().getSimpleVT())) {
4761 int Lane = SVN->getSplatIndex();
4762 // If this is undef splat, generate it via "just" vdup, if possible.
4766 if (Lane == 0 && V1.getOpcode() == ISD::SCALAR_TO_VECTOR)
4767 return DAG.getNode(AArch64ISD::DUP, dl, V1.getValueType(),
4769 // Test if V1 is a BUILD_VECTOR and the lane being referenced is a non-
4770 // constant. If so, we can just reference the lane's definition directly.
4771 if (V1.getOpcode() == ISD::BUILD_VECTOR &&
4772 !isa<ConstantSDNode>(V1.getOperand(Lane)))
4773 return DAG.getNode(AArch64ISD::DUP, dl, VT, V1.getOperand(Lane));
4775 // Otherwise, duplicate from the lane of the input vector.
4776 unsigned Opcode = getDUPLANEOp(V1.getValueType().getVectorElementType());
4778 // SelectionDAGBuilder may have "helpfully" already extracted or conatenated
4779 // to make a vector of the same size as this SHUFFLE. We can ignore the
4780 // extract entirely, and canonicalise the concat using WidenVector.
4781 if (V1.getOpcode() == ISD::EXTRACT_SUBVECTOR) {
4782 Lane += cast<ConstantSDNode>(V1.getOperand(1))->getZExtValue();
4783 V1 = V1.getOperand(0);
4784 } else if (V1.getOpcode() == ISD::CONCAT_VECTORS) {
4785 unsigned Idx = Lane >= (int)VT.getVectorNumElements() / 2;
4786 Lane -= Idx * VT.getVectorNumElements() / 2;
4787 V1 = WidenVector(V1.getOperand(Idx), DAG);
4788 } else if (VT.getSizeInBits() == 64)
4789 V1 = WidenVector(V1, DAG);
4791 return DAG.getNode(Opcode, dl, VT, V1, DAG.getConstant(Lane, MVT::i64));
4794 if (isREVMask(ShuffleMask, VT, 64))
4795 return DAG.getNode(AArch64ISD::REV64, dl, V1.getValueType(), V1, V2);
4796 if (isREVMask(ShuffleMask, VT, 32))
4797 return DAG.getNode(AArch64ISD::REV32, dl, V1.getValueType(), V1, V2);
4798 if (isREVMask(ShuffleMask, VT, 16))
4799 return DAG.getNode(AArch64ISD::REV16, dl, V1.getValueType(), V1, V2);
4801 bool ReverseEXT = false;
4803 if (isEXTMask(ShuffleMask, VT, ReverseEXT, Imm)) {
4806 Imm *= getExtFactor(V1);
4807 return DAG.getNode(AArch64ISD::EXT, dl, V1.getValueType(), V1, V2,
4808 DAG.getConstant(Imm, MVT::i32));
4809 } else if (V2->getOpcode() == ISD::UNDEF &&
4810 isSingletonEXTMask(ShuffleMask, VT, Imm)) {
4811 Imm *= getExtFactor(V1);
4812 return DAG.getNode(AArch64ISD::EXT, dl, V1.getValueType(), V1, V1,
4813 DAG.getConstant(Imm, MVT::i32));
4816 unsigned WhichResult;
4817 if (isZIPMask(ShuffleMask, VT, WhichResult)) {
4818 unsigned Opc = (WhichResult == 0) ? AArch64ISD::ZIP1 : AArch64ISD::ZIP2;
4819 return DAG.getNode(Opc, dl, V1.getValueType(), V1, V2);
4821 if (isUZPMask(ShuffleMask, VT, WhichResult)) {
4822 unsigned Opc = (WhichResult == 0) ? AArch64ISD::UZP1 : AArch64ISD::UZP2;
4823 return DAG.getNode(Opc, dl, V1.getValueType(), V1, V2);
4825 if (isTRNMask(ShuffleMask, VT, WhichResult)) {
4826 unsigned Opc = (WhichResult == 0) ? AArch64ISD::TRN1 : AArch64ISD::TRN2;
4827 return DAG.getNode(Opc, dl, V1.getValueType(), V1, V2);
4830 if (isZIP_v_undef_Mask(ShuffleMask, VT, WhichResult)) {
4831 unsigned Opc = (WhichResult == 0) ? AArch64ISD::ZIP1 : AArch64ISD::ZIP2;
4832 return DAG.getNode(Opc, dl, V1.getValueType(), V1, V1);
4834 if (isUZP_v_undef_Mask(ShuffleMask, VT, WhichResult)) {
4835 unsigned Opc = (WhichResult == 0) ? AArch64ISD::UZP1 : AArch64ISD::UZP2;
4836 return DAG.getNode(Opc, dl, V1.getValueType(), V1, V1);
4838 if (isTRN_v_undef_Mask(ShuffleMask, VT, WhichResult)) {
4839 unsigned Opc = (WhichResult == 0) ? AArch64ISD::TRN1 : AArch64ISD::TRN2;
4840 return DAG.getNode(Opc, dl, V1.getValueType(), V1, V1);
4843 SDValue Concat = tryFormConcatFromShuffle(Op, DAG);
4844 if (Concat.getNode())
4849 int NumInputElements = V1.getValueType().getVectorNumElements();
4850 if (isINSMask(ShuffleMask, NumInputElements, DstIsLeft, Anomaly)) {
4851 SDValue DstVec = DstIsLeft ? V1 : V2;
4852 SDValue DstLaneV = DAG.getConstant(Anomaly, MVT::i64);
4854 SDValue SrcVec = V1;
4855 int SrcLane = ShuffleMask[Anomaly];
4856 if (SrcLane >= NumInputElements) {
4858 SrcLane -= VT.getVectorNumElements();
4860 SDValue SrcLaneV = DAG.getConstant(SrcLane, MVT::i64);
4862 EVT ScalarVT = VT.getVectorElementType();
4863 if (ScalarVT.getSizeInBits() < 32)
4864 ScalarVT = MVT::i32;
4867 ISD::INSERT_VECTOR_ELT, dl, VT, DstVec,
4868 DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, ScalarVT, SrcVec, SrcLaneV),
4872 // If the shuffle is not directly supported and it has 4 elements, use
4873 // the PerfectShuffle-generated table to synthesize it from other shuffles.
4874 unsigned NumElts = VT.getVectorNumElements();
4876 unsigned PFIndexes[4];
4877 for (unsigned i = 0; i != 4; ++i) {
4878 if (ShuffleMask[i] < 0)
4881 PFIndexes[i] = ShuffleMask[i];
4884 // Compute the index in the perfect shuffle table.
4885 unsigned PFTableIndex = PFIndexes[0] * 9 * 9 * 9 + PFIndexes[1] * 9 * 9 +
4886 PFIndexes[2] * 9 + PFIndexes[3];
4887 unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
4888 unsigned Cost = (PFEntry >> 30);
4891 return GeneratePerfectShuffle(PFEntry, V1, V2, DAG, dl);
4894 return GenerateTBL(Op, ShuffleMask, DAG);
4897 static bool resolveBuildVector(BuildVectorSDNode *BVN, APInt &CnstBits,
4899 EVT VT = BVN->getValueType(0);
4900 APInt SplatBits, SplatUndef;
4901 unsigned SplatBitSize;
4903 if (BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize, HasAnyUndefs)) {
4904 unsigned NumSplats = VT.getSizeInBits() / SplatBitSize;
4906 for (unsigned i = 0; i < NumSplats; ++i) {
4907 CnstBits <<= SplatBitSize;
4908 UndefBits <<= SplatBitSize;
4909 CnstBits |= SplatBits.zextOrTrunc(VT.getSizeInBits());
4910 UndefBits |= (SplatBits ^ SplatUndef).zextOrTrunc(VT.getSizeInBits());
4919 SDValue AArch64TargetLowering::LowerVectorAND(SDValue Op,
4920 SelectionDAG &DAG) const {
4921 BuildVectorSDNode *BVN =
4922 dyn_cast<BuildVectorSDNode>(Op.getOperand(1).getNode());
4923 SDValue LHS = Op.getOperand(0);
4925 EVT VT = Op.getValueType();
4930 APInt CnstBits(VT.getSizeInBits(), 0);
4931 APInt UndefBits(VT.getSizeInBits(), 0);
4932 if (resolveBuildVector(BVN, CnstBits, UndefBits)) {
4933 // We only have BIC vector immediate instruction, which is and-not.
4934 CnstBits = ~CnstBits;
4936 // We make use of a little bit of goto ickiness in order to avoid having to
4937 // duplicate the immediate matching logic for the undef toggled case.
4938 bool SecondTry = false;
4941 if (CnstBits.getHiBits(64) == CnstBits.getLoBits(64)) {
4942 CnstBits = CnstBits.zextOrTrunc(64);
4943 uint64_t CnstVal = CnstBits.getZExtValue();
4945 if (AArch64_AM::isAdvSIMDModImmType1(CnstVal)) {
4946 CnstVal = AArch64_AM::encodeAdvSIMDModImmType1(CnstVal);
4947 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
4948 SDValue Mov = DAG.getNode(AArch64ISD::BICi, dl, MovTy, LHS,
4949 DAG.getConstant(CnstVal, MVT::i32),
4950 DAG.getConstant(0, MVT::i32));
4951 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
4954 if (AArch64_AM::isAdvSIMDModImmType2(CnstVal)) {
4955 CnstVal = AArch64_AM::encodeAdvSIMDModImmType2(CnstVal);
4956 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
4957 SDValue Mov = DAG.getNode(AArch64ISD::BICi, dl, MovTy, LHS,
4958 DAG.getConstant(CnstVal, MVT::i32),
4959 DAG.getConstant(8, MVT::i32));
4960 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
4963 if (AArch64_AM::isAdvSIMDModImmType3(CnstVal)) {
4964 CnstVal = AArch64_AM::encodeAdvSIMDModImmType3(CnstVal);
4965 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
4966 SDValue Mov = DAG.getNode(AArch64ISD::BICi, dl, MovTy, LHS,
4967 DAG.getConstant(CnstVal, MVT::i32),
4968 DAG.getConstant(16, MVT::i32));
4969 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
4972 if (AArch64_AM::isAdvSIMDModImmType4(CnstVal)) {
4973 CnstVal = AArch64_AM::encodeAdvSIMDModImmType4(CnstVal);
4974 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
4975 SDValue Mov = DAG.getNode(AArch64ISD::BICi, dl, MovTy, LHS,
4976 DAG.getConstant(CnstVal, MVT::i32),
4977 DAG.getConstant(24, MVT::i32));
4978 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
4981 if (AArch64_AM::isAdvSIMDModImmType5(CnstVal)) {
4982 CnstVal = AArch64_AM::encodeAdvSIMDModImmType5(CnstVal);
4983 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
4984 SDValue Mov = DAG.getNode(AArch64ISD::BICi, dl, MovTy, LHS,
4985 DAG.getConstant(CnstVal, MVT::i32),
4986 DAG.getConstant(0, MVT::i32));
4987 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
4990 if (AArch64_AM::isAdvSIMDModImmType6(CnstVal)) {
4991 CnstVal = AArch64_AM::encodeAdvSIMDModImmType6(CnstVal);
4992 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
4993 SDValue Mov = DAG.getNode(AArch64ISD::BICi, dl, MovTy, LHS,
4994 DAG.getConstant(CnstVal, MVT::i32),
4995 DAG.getConstant(8, MVT::i32));
4996 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5003 CnstBits = ~UndefBits;
5007 // We can always fall back to a non-immediate AND.
5012 // Specialized code to quickly find if PotentialBVec is a BuildVector that
5013 // consists of only the same constant int value, returned in reference arg
5015 static bool isAllConstantBuildVector(const SDValue &PotentialBVec,
5016 uint64_t &ConstVal) {
5017 BuildVectorSDNode *Bvec = dyn_cast<BuildVectorSDNode>(PotentialBVec);
5020 ConstantSDNode *FirstElt = dyn_cast<ConstantSDNode>(Bvec->getOperand(0));
5023 EVT VT = Bvec->getValueType(0);
5024 unsigned NumElts = VT.getVectorNumElements();
5025 for (unsigned i = 1; i < NumElts; ++i)
5026 if (dyn_cast<ConstantSDNode>(Bvec->getOperand(i)) != FirstElt)
5028 ConstVal = FirstElt->getZExtValue();
5032 static unsigned getIntrinsicID(const SDNode *N) {
5033 unsigned Opcode = N->getOpcode();
5036 return Intrinsic::not_intrinsic;
5037 case ISD::INTRINSIC_WO_CHAIN: {
5038 unsigned IID = cast<ConstantSDNode>(N->getOperand(0))->getZExtValue();
5039 if (IID < Intrinsic::num_intrinsics)
5041 return Intrinsic::not_intrinsic;
5046 // Attempt to form a vector S[LR]I from (or (and X, BvecC1), (lsl Y, C2)),
5047 // to (SLI X, Y, C2), where X and Y have matching vector types, BvecC1 is a
5048 // BUILD_VECTORs with constant element C1, C2 is a constant, and C1 == ~C2.
5049 // Also, logical shift right -> sri, with the same structure.
5050 static SDValue tryLowerToSLI(SDNode *N, SelectionDAG &DAG) {
5051 EVT VT = N->getValueType(0);
5058 // Is the first op an AND?
5059 const SDValue And = N->getOperand(0);
5060 if (And.getOpcode() != ISD::AND)
5063 // Is the second op an shl or lshr?
5064 SDValue Shift = N->getOperand(1);
5065 // This will have been turned into: AArch64ISD::VSHL vector, #shift
5066 // or AArch64ISD::VLSHR vector, #shift
5067 unsigned ShiftOpc = Shift.getOpcode();
5068 if ((ShiftOpc != AArch64ISD::VSHL && ShiftOpc != AArch64ISD::VLSHR))
5070 bool IsShiftRight = ShiftOpc == AArch64ISD::VLSHR;
5072 // Is the shift amount constant?
5073 ConstantSDNode *C2node = dyn_cast<ConstantSDNode>(Shift.getOperand(1));
5077 // Is the and mask vector all constant?
5079 if (!isAllConstantBuildVector(And.getOperand(1), C1))
5082 // Is C1 == ~C2, taking into account how much one can shift elements of a
5084 uint64_t C2 = C2node->getZExtValue();
5085 unsigned ElemSizeInBits = VT.getVectorElementType().getSizeInBits();
5086 if (C2 > ElemSizeInBits)
5088 unsigned ElemMask = (1 << ElemSizeInBits) - 1;
5089 if ((C1 & ElemMask) != (~C2 & ElemMask))
5092 SDValue X = And.getOperand(0);
5093 SDValue Y = Shift.getOperand(0);
5096 IsShiftRight ? Intrinsic::aarch64_neon_vsri : Intrinsic::aarch64_neon_vsli;
5098 DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DL, VT,
5099 DAG.getConstant(Intrin, MVT::i32), X, Y, Shift.getOperand(1));
5101 DEBUG(dbgs() << "aarch64-lower: transformed: \n");
5102 DEBUG(N->dump(&DAG));
5103 DEBUG(dbgs() << "into: \n");
5104 DEBUG(ResultSLI->dump(&DAG));
5110 SDValue AArch64TargetLowering::LowerVectorOR(SDValue Op,
5111 SelectionDAG &DAG) const {
5112 // Attempt to form a vector S[LR]I from (or (and X, C1), (lsl Y, C2))
5113 if (EnableAArch64SlrGeneration) {
5114 SDValue Res = tryLowerToSLI(Op.getNode(), DAG);
5119 BuildVectorSDNode *BVN =
5120 dyn_cast<BuildVectorSDNode>(Op.getOperand(0).getNode());
5121 SDValue LHS = Op.getOperand(1);
5123 EVT VT = Op.getValueType();
5125 // OR commutes, so try swapping the operands.
5127 LHS = Op.getOperand(0);
5128 BVN = dyn_cast<BuildVectorSDNode>(Op.getOperand(1).getNode());
5133 APInt CnstBits(VT.getSizeInBits(), 0);
5134 APInt UndefBits(VT.getSizeInBits(), 0);
5135 if (resolveBuildVector(BVN, CnstBits, UndefBits)) {
5136 // We make use of a little bit of goto ickiness in order to avoid having to
5137 // duplicate the immediate matching logic for the undef toggled case.
5138 bool SecondTry = false;
5141 if (CnstBits.getHiBits(64) == CnstBits.getLoBits(64)) {
5142 CnstBits = CnstBits.zextOrTrunc(64);
5143 uint64_t CnstVal = CnstBits.getZExtValue();
5145 if (AArch64_AM::isAdvSIMDModImmType1(CnstVal)) {
5146 CnstVal = AArch64_AM::encodeAdvSIMDModImmType1(CnstVal);
5147 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5148 SDValue Mov = DAG.getNode(AArch64ISD::ORRi, dl, MovTy, LHS,
5149 DAG.getConstant(CnstVal, MVT::i32),
5150 DAG.getConstant(0, MVT::i32));
5151 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5154 if (AArch64_AM::isAdvSIMDModImmType2(CnstVal)) {
5155 CnstVal = AArch64_AM::encodeAdvSIMDModImmType2(CnstVal);
5156 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5157 SDValue Mov = DAG.getNode(AArch64ISD::ORRi, dl, MovTy, LHS,
5158 DAG.getConstant(CnstVal, MVT::i32),
5159 DAG.getConstant(8, MVT::i32));
5160 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5163 if (AArch64_AM::isAdvSIMDModImmType3(CnstVal)) {
5164 CnstVal = AArch64_AM::encodeAdvSIMDModImmType3(CnstVal);
5165 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5166 SDValue Mov = DAG.getNode(AArch64ISD::ORRi, dl, MovTy, LHS,
5167 DAG.getConstant(CnstVal, MVT::i32),
5168 DAG.getConstant(16, MVT::i32));
5169 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5172 if (AArch64_AM::isAdvSIMDModImmType4(CnstVal)) {
5173 CnstVal = AArch64_AM::encodeAdvSIMDModImmType4(CnstVal);
5174 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5175 SDValue Mov = DAG.getNode(AArch64ISD::ORRi, dl, MovTy, LHS,
5176 DAG.getConstant(CnstVal, MVT::i32),
5177 DAG.getConstant(24, MVT::i32));
5178 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5181 if (AArch64_AM::isAdvSIMDModImmType5(CnstVal)) {
5182 CnstVal = AArch64_AM::encodeAdvSIMDModImmType5(CnstVal);
5183 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
5184 SDValue Mov = DAG.getNode(AArch64ISD::ORRi, dl, MovTy, LHS,
5185 DAG.getConstant(CnstVal, MVT::i32),
5186 DAG.getConstant(0, MVT::i32));
5187 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5190 if (AArch64_AM::isAdvSIMDModImmType6(CnstVal)) {
5191 CnstVal = AArch64_AM::encodeAdvSIMDModImmType6(CnstVal);
5192 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
5193 SDValue Mov = DAG.getNode(AArch64ISD::ORRi, dl, MovTy, LHS,
5194 DAG.getConstant(CnstVal, MVT::i32),
5195 DAG.getConstant(8, MVT::i32));
5196 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5203 CnstBits = UndefBits;
5207 // We can always fall back to a non-immediate OR.
5212 // Normalize the operands of BUILD_VECTOR. The value of constant operands will
5213 // be truncated to fit element width.
5214 static SDValue NormalizeBuildVector(SDValue Op,
5215 SelectionDAG &DAG) {
5216 assert(Op.getOpcode() == ISD::BUILD_VECTOR && "Unknown opcode!");
5218 EVT VT = Op.getValueType();
5219 EVT EltTy= VT.getVectorElementType();
5221 if (EltTy.isFloatingPoint() || EltTy.getSizeInBits() > 16)
5224 SmallVector<SDValue, 16> Ops;
5225 for (unsigned I = 0, E = VT.getVectorNumElements(); I != E; ++I) {
5226 SDValue Lane = Op.getOperand(I);
5227 if (Lane.getOpcode() == ISD::Constant) {
5228 APInt LowBits(EltTy.getSizeInBits(),
5229 cast<ConstantSDNode>(Lane)->getZExtValue());
5230 Lane = DAG.getConstant(LowBits.getZExtValue(), MVT::i32);
5232 Ops.push_back(Lane);
5234 return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, Ops);
5237 SDValue AArch64TargetLowering::LowerBUILD_VECTOR(SDValue Op,
5238 SelectionDAG &DAG) const {
5240 EVT VT = Op.getValueType();
5241 Op = NormalizeBuildVector(Op, DAG);
5242 BuildVectorSDNode *BVN = cast<BuildVectorSDNode>(Op.getNode());
5244 APInt CnstBits(VT.getSizeInBits(), 0);
5245 APInt UndefBits(VT.getSizeInBits(), 0);
5246 if (resolveBuildVector(BVN, CnstBits, UndefBits)) {
5247 // We make use of a little bit of goto ickiness in order to avoid having to
5248 // duplicate the immediate matching logic for the undef toggled case.
5249 bool SecondTry = false;
5252 if (CnstBits.getHiBits(64) == CnstBits.getLoBits(64)) {
5253 CnstBits = CnstBits.zextOrTrunc(64);
5254 uint64_t CnstVal = CnstBits.getZExtValue();
5256 // Certain magic vector constants (used to express things like NOT
5257 // and NEG) are passed through unmodified. This allows codegen patterns
5258 // for these operations to match. Special-purpose patterns will lower
5259 // these immediates to MOVIs if it proves necessary.
5260 if (VT.isInteger() && (CnstVal == 0 || CnstVal == ~0ULL))
5263 // The many faces of MOVI...
5264 if (AArch64_AM::isAdvSIMDModImmType10(CnstVal)) {
5265 CnstVal = AArch64_AM::encodeAdvSIMDModImmType10(CnstVal);
5266 if (VT.getSizeInBits() == 128) {
5267 SDValue Mov = DAG.getNode(AArch64ISD::MOVIedit, dl, MVT::v2i64,
5268 DAG.getConstant(CnstVal, MVT::i32));
5269 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5272 // Support the V64 version via subregister insertion.
5273 SDValue Mov = DAG.getNode(AArch64ISD::MOVIedit, dl, MVT::f64,
5274 DAG.getConstant(CnstVal, MVT::i32));
5275 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5278 if (AArch64_AM::isAdvSIMDModImmType1(CnstVal)) {
5279 CnstVal = AArch64_AM::encodeAdvSIMDModImmType1(CnstVal);
5280 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5281 SDValue Mov = DAG.getNode(AArch64ISD::MOVIshift, dl, MovTy,
5282 DAG.getConstant(CnstVal, MVT::i32),
5283 DAG.getConstant(0, MVT::i32));
5284 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5287 if (AArch64_AM::isAdvSIMDModImmType2(CnstVal)) {
5288 CnstVal = AArch64_AM::encodeAdvSIMDModImmType2(CnstVal);
5289 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5290 SDValue Mov = DAG.getNode(AArch64ISD::MOVIshift, dl, MovTy,
5291 DAG.getConstant(CnstVal, MVT::i32),
5292 DAG.getConstant(8, MVT::i32));
5293 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5296 if (AArch64_AM::isAdvSIMDModImmType3(CnstVal)) {
5297 CnstVal = AArch64_AM::encodeAdvSIMDModImmType3(CnstVal);
5298 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5299 SDValue Mov = DAG.getNode(AArch64ISD::MOVIshift, dl, MovTy,
5300 DAG.getConstant(CnstVal, MVT::i32),
5301 DAG.getConstant(16, MVT::i32));
5302 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5305 if (AArch64_AM::isAdvSIMDModImmType4(CnstVal)) {
5306 CnstVal = AArch64_AM::encodeAdvSIMDModImmType4(CnstVal);
5307 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5308 SDValue Mov = DAG.getNode(AArch64ISD::MOVIshift, dl, MovTy,
5309 DAG.getConstant(CnstVal, MVT::i32),
5310 DAG.getConstant(24, MVT::i32));
5311 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5314 if (AArch64_AM::isAdvSIMDModImmType5(CnstVal)) {
5315 CnstVal = AArch64_AM::encodeAdvSIMDModImmType5(CnstVal);
5316 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
5317 SDValue Mov = DAG.getNode(AArch64ISD::MOVIshift, dl, MovTy,
5318 DAG.getConstant(CnstVal, MVT::i32),
5319 DAG.getConstant(0, MVT::i32));
5320 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5323 if (AArch64_AM::isAdvSIMDModImmType6(CnstVal)) {
5324 CnstVal = AArch64_AM::encodeAdvSIMDModImmType6(CnstVal);
5325 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
5326 SDValue Mov = DAG.getNode(AArch64ISD::MOVIshift, dl, MovTy,
5327 DAG.getConstant(CnstVal, MVT::i32),
5328 DAG.getConstant(8, MVT::i32));
5329 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5332 if (AArch64_AM::isAdvSIMDModImmType7(CnstVal)) {
5333 CnstVal = AArch64_AM::encodeAdvSIMDModImmType7(CnstVal);
5334 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5335 SDValue Mov = DAG.getNode(AArch64ISD::MOVImsl, dl, MovTy,
5336 DAG.getConstant(CnstVal, MVT::i32),
5337 DAG.getConstant(264, MVT::i32));
5338 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5341 if (AArch64_AM::isAdvSIMDModImmType8(CnstVal)) {
5342 CnstVal = AArch64_AM::encodeAdvSIMDModImmType8(CnstVal);
5343 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5344 SDValue Mov = DAG.getNode(AArch64ISD::MOVImsl, dl, MovTy,
5345 DAG.getConstant(CnstVal, MVT::i32),
5346 DAG.getConstant(272, MVT::i32));
5347 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5350 if (AArch64_AM::isAdvSIMDModImmType9(CnstVal)) {
5351 CnstVal = AArch64_AM::encodeAdvSIMDModImmType9(CnstVal);
5352 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v16i8 : MVT::v8i8;
5353 SDValue Mov = DAG.getNode(AArch64ISD::MOVI, dl, MovTy,
5354 DAG.getConstant(CnstVal, MVT::i32));
5355 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5358 // The few faces of FMOV...
5359 if (AArch64_AM::isAdvSIMDModImmType11(CnstVal)) {
5360 CnstVal = AArch64_AM::encodeAdvSIMDModImmType11(CnstVal);
5361 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4f32 : MVT::v2f32;
5362 SDValue Mov = DAG.getNode(AArch64ISD::FMOV, dl, MovTy,
5363 DAG.getConstant(CnstVal, MVT::i32));
5364 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5367 if (AArch64_AM::isAdvSIMDModImmType12(CnstVal) &&
5368 VT.getSizeInBits() == 128) {
5369 CnstVal = AArch64_AM::encodeAdvSIMDModImmType12(CnstVal);
5370 SDValue Mov = DAG.getNode(AArch64ISD::FMOV, dl, MVT::v2f64,
5371 DAG.getConstant(CnstVal, MVT::i32));
5372 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5375 // The many faces of MVNI...
5377 if (AArch64_AM::isAdvSIMDModImmType1(CnstVal)) {
5378 CnstVal = AArch64_AM::encodeAdvSIMDModImmType1(CnstVal);
5379 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5380 SDValue Mov = DAG.getNode(AArch64ISD::MVNIshift, dl, MovTy,
5381 DAG.getConstant(CnstVal, MVT::i32),
5382 DAG.getConstant(0, MVT::i32));
5383 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5386 if (AArch64_AM::isAdvSIMDModImmType2(CnstVal)) {
5387 CnstVal = AArch64_AM::encodeAdvSIMDModImmType2(CnstVal);
5388 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5389 SDValue Mov = DAG.getNode(AArch64ISD::MVNIshift, dl, MovTy,
5390 DAG.getConstant(CnstVal, MVT::i32),
5391 DAG.getConstant(8, MVT::i32));
5392 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5395 if (AArch64_AM::isAdvSIMDModImmType3(CnstVal)) {
5396 CnstVal = AArch64_AM::encodeAdvSIMDModImmType3(CnstVal);
5397 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5398 SDValue Mov = DAG.getNode(AArch64ISD::MVNIshift, dl, MovTy,
5399 DAG.getConstant(CnstVal, MVT::i32),
5400 DAG.getConstant(16, MVT::i32));
5401 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5404 if (AArch64_AM::isAdvSIMDModImmType4(CnstVal)) {
5405 CnstVal = AArch64_AM::encodeAdvSIMDModImmType4(CnstVal);
5406 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5407 SDValue Mov = DAG.getNode(AArch64ISD::MVNIshift, dl, MovTy,
5408 DAG.getConstant(CnstVal, MVT::i32),
5409 DAG.getConstant(24, MVT::i32));
5410 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5413 if (AArch64_AM::isAdvSIMDModImmType5(CnstVal)) {
5414 CnstVal = AArch64_AM::encodeAdvSIMDModImmType5(CnstVal);
5415 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
5416 SDValue Mov = DAG.getNode(AArch64ISD::MVNIshift, dl, MovTy,
5417 DAG.getConstant(CnstVal, MVT::i32),
5418 DAG.getConstant(0, MVT::i32));
5419 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5422 if (AArch64_AM::isAdvSIMDModImmType6(CnstVal)) {
5423 CnstVal = AArch64_AM::encodeAdvSIMDModImmType6(CnstVal);
5424 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
5425 SDValue Mov = DAG.getNode(AArch64ISD::MVNIshift, dl, MovTy,
5426 DAG.getConstant(CnstVal, MVT::i32),
5427 DAG.getConstant(8, MVT::i32));
5428 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5431 if (AArch64_AM::isAdvSIMDModImmType7(CnstVal)) {
5432 CnstVal = AArch64_AM::encodeAdvSIMDModImmType7(CnstVal);
5433 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5434 SDValue Mov = DAG.getNode(AArch64ISD::MVNImsl, dl, MovTy,
5435 DAG.getConstant(CnstVal, MVT::i32),
5436 DAG.getConstant(264, MVT::i32));
5437 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5440 if (AArch64_AM::isAdvSIMDModImmType8(CnstVal)) {
5441 CnstVal = AArch64_AM::encodeAdvSIMDModImmType8(CnstVal);
5442 MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
5443 SDValue Mov = DAG.getNode(AArch64ISD::MVNImsl, dl, MovTy,
5444 DAG.getConstant(CnstVal, MVT::i32),
5445 DAG.getConstant(272, MVT::i32));
5446 return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
5453 CnstBits = UndefBits;
5458 // Scan through the operands to find some interesting properties we can
5460 // 1) If only one value is used, we can use a DUP, or
5461 // 2) if only the low element is not undef, we can just insert that, or
5462 // 3) if only one constant value is used (w/ some non-constant lanes),
5463 // we can splat the constant value into the whole vector then fill
5464 // in the non-constant lanes.
5465 // 4) FIXME: If different constant values are used, but we can intelligently
5466 // select the values we'll be overwriting for the non-constant
5467 // lanes such that we can directly materialize the vector
5468 // some other way (MOVI, e.g.), we can be sneaky.
5469 unsigned NumElts = VT.getVectorNumElements();
5470 bool isOnlyLowElement = true;
5471 bool usesOnlyOneValue = true;
5472 bool usesOnlyOneConstantValue = true;
5473 bool isConstant = true;
5474 unsigned NumConstantLanes = 0;
5476 SDValue ConstantValue;
5477 for (unsigned i = 0; i < NumElts; ++i) {
5478 SDValue V = Op.getOperand(i);
5479 if (V.getOpcode() == ISD::UNDEF)
5482 isOnlyLowElement = false;
5483 if (!isa<ConstantFPSDNode>(V) && !isa<ConstantSDNode>(V))
5486 if (isa<ConstantSDNode>(V) || isa<ConstantFPSDNode>(V)) {
5488 if (!ConstantValue.getNode())
5490 else if (ConstantValue != V)
5491 usesOnlyOneConstantValue = false;
5494 if (!Value.getNode())
5496 else if (V != Value)
5497 usesOnlyOneValue = false;
5500 if (!Value.getNode())
5501 return DAG.getUNDEF(VT);
5503 if (isOnlyLowElement)
5504 return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Value);
5506 // Use DUP for non-constant splats. For f32 constant splats, reduce to
5507 // i32 and try again.
5508 if (usesOnlyOneValue) {
5510 if (Value.getOpcode() != ISD::EXTRACT_VECTOR_ELT ||
5511 Value.getValueType() != VT)
5512 return DAG.getNode(AArch64ISD::DUP, dl, VT, Value);
5514 // This is actually a DUPLANExx operation, which keeps everything vectory.
5516 // DUPLANE works on 128-bit vectors, widen it if necessary.
5517 SDValue Lane = Value.getOperand(1);
5518 Value = Value.getOperand(0);
5519 if (Value.getValueType().getSizeInBits() == 64)
5520 Value = WidenVector(Value, DAG);
5522 unsigned Opcode = getDUPLANEOp(VT.getVectorElementType());
5523 return DAG.getNode(Opcode, dl, VT, Value, Lane);
5526 if (VT.getVectorElementType().isFloatingPoint()) {
5527 SmallVector<SDValue, 8> Ops;
5529 (VT.getVectorElementType() == MVT::f32) ? MVT::i32 : MVT::i64;
5530 for (unsigned i = 0; i < NumElts; ++i)
5531 Ops.push_back(DAG.getNode(ISD::BITCAST, dl, NewType, Op.getOperand(i)));
5532 EVT VecVT = EVT::getVectorVT(*DAG.getContext(), NewType, NumElts);
5533 SDValue Val = DAG.getNode(ISD::BUILD_VECTOR, dl, VecVT, Ops);
5534 Val = LowerBUILD_VECTOR(Val, DAG);
5536 return DAG.getNode(ISD::BITCAST, dl, VT, Val);
5540 // If there was only one constant value used and for more than one lane,
5541 // start by splatting that value, then replace the non-constant lanes. This
5542 // is better than the default, which will perform a separate initialization
5544 if (NumConstantLanes > 0 && usesOnlyOneConstantValue) {
5545 SDValue Val = DAG.getNode(AArch64ISD::DUP, dl, VT, ConstantValue);
5546 // Now insert the non-constant lanes.
5547 for (unsigned i = 0; i < NumElts; ++i) {
5548 SDValue V = Op.getOperand(i);
5549 SDValue LaneIdx = DAG.getConstant(i, MVT::i64);
5550 if (!isa<ConstantSDNode>(V) && !isa<ConstantFPSDNode>(V)) {
5551 // Note that type legalization likely mucked about with the VT of the
5552 // source operand, so we may have to convert it here before inserting.
5553 Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, Val, V, LaneIdx);
5559 // If all elements are constants and the case above didn't get hit, fall back
5560 // to the default expansion, which will generate a load from the constant
5565 // Empirical tests suggest this is rarely worth it for vectors of length <= 2.
5567 SDValue shuffle = ReconstructShuffle(Op, DAG);
5568 if (shuffle != SDValue())
5572 // If all else fails, just use a sequence of INSERT_VECTOR_ELT when we
5573 // know the default expansion would otherwise fall back on something even
5574 // worse. For a vector with one or two non-undef values, that's
5575 // scalar_to_vector for the elements followed by a shuffle (provided the
5576 // shuffle is valid for the target) and materialization element by element
5577 // on the stack followed by a load for everything else.
5578 if (!isConstant && !usesOnlyOneValue) {
5579 SDValue Vec = DAG.getUNDEF(VT);
5580 SDValue Op0 = Op.getOperand(0);
5581 unsigned ElemSize = VT.getVectorElementType().getSizeInBits();
5583 // For 32 and 64 bit types, use INSERT_SUBREG for lane zero to
5584 // a) Avoid a RMW dependency on the full vector register, and
5585 // b) Allow the register coalescer to fold away the copy if the
5586 // value is already in an S or D register.
5587 if (Op0.getOpcode() != ISD::UNDEF && (ElemSize == 32 || ElemSize == 64)) {
5588 unsigned SubIdx = ElemSize == 32 ? AArch64::ssub : AArch64::dsub;
5590 DAG.getMachineNode(TargetOpcode::INSERT_SUBREG, dl, VT, Vec, Op0,
5591 DAG.getTargetConstant(SubIdx, MVT::i32));
5592 Vec = SDValue(N, 0);
5595 for (; i < NumElts; ++i) {
5596 SDValue V = Op.getOperand(i);
5597 if (V.getOpcode() == ISD::UNDEF)
5599 SDValue LaneIdx = DAG.getConstant(i, MVT::i64);
5600 Vec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, Vec, V, LaneIdx);
5605 // Just use the default expansion. We failed to find a better alternative.
5609 SDValue AArch64TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op,
5610 SelectionDAG &DAG) const {
5611 assert(Op.getOpcode() == ISD::INSERT_VECTOR_ELT && "Unknown opcode!");
5613 // Check for non-constant or out of range lane.
5614 EVT VT = Op.getOperand(0).getValueType();
5615 ConstantSDNode *CI = dyn_cast<ConstantSDNode>(Op.getOperand(2));
5616 if (!CI || CI->getZExtValue() >= VT.getVectorNumElements())
5620 // Insertion/extraction are legal for V128 types.
5621 if (VT == MVT::v16i8 || VT == MVT::v8i16 || VT == MVT::v4i32 ||
5622 VT == MVT::v2i64 || VT == MVT::v4f32 || VT == MVT::v2f64)
5625 if (VT != MVT::v8i8 && VT != MVT::v4i16 && VT != MVT::v2i32 &&
5626 VT != MVT::v1i64 && VT != MVT::v2f32)
5629 // For V64 types, we perform insertion by expanding the value
5630 // to a V128 type and perform the insertion on that.
5632 SDValue WideVec = WidenVector(Op.getOperand(0), DAG);
5633 EVT WideTy = WideVec.getValueType();
5635 SDValue Node = DAG.getNode(ISD::INSERT_VECTOR_ELT, DL, WideTy, WideVec,
5636 Op.getOperand(1), Op.getOperand(2));
5637 // Re-narrow the resultant vector.
5638 return NarrowVector(Node, DAG);
5642 AArch64TargetLowering::LowerEXTRACT_VECTOR_ELT(SDValue Op,
5643 SelectionDAG &DAG) const {
5644 assert(Op.getOpcode() == ISD::EXTRACT_VECTOR_ELT && "Unknown opcode!");
5646 // Check for non-constant or out of range lane.
5647 EVT VT = Op.getOperand(0).getValueType();
5648 ConstantSDNode *CI = dyn_cast<ConstantSDNode>(Op.getOperand(1));
5649 if (!CI || CI->getZExtValue() >= VT.getVectorNumElements())
5653 // Insertion/extraction are legal for V128 types.
5654 if (VT == MVT::v16i8 || VT == MVT::v8i16 || VT == MVT::v4i32 ||
5655 VT == MVT::v2i64 || VT == MVT::v4f32 || VT == MVT::v2f64)
5658 if (VT != MVT::v8i8 && VT != MVT::v4i16 && VT != MVT::v2i32 &&
5659 VT != MVT::v1i64 && VT != MVT::v2f32)
5662 // For V64 types, we perform extraction by expanding the value
5663 // to a V128 type and perform the extraction on that.
5665 SDValue WideVec = WidenVector(Op.getOperand(0), DAG);
5666 EVT WideTy = WideVec.getValueType();
5668 EVT ExtrTy = WideTy.getVectorElementType();
5669 if (ExtrTy == MVT::i16 || ExtrTy == MVT::i8)
5672 // For extractions, we just return the result directly.
5673 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, ExtrTy, WideVec,
5677 SDValue AArch64TargetLowering::LowerEXTRACT_SUBVECTOR(SDValue Op,
5678 SelectionDAG &DAG) const {
5679 EVT VT = Op.getOperand(0).getValueType();
5685 ConstantSDNode *Cst = dyn_cast<ConstantSDNode>(Op.getOperand(1));
5688 unsigned Val = Cst->getZExtValue();
5690 unsigned Size = Op.getValueType().getSizeInBits();
5694 return DAG.getTargetExtractSubreg(AArch64::bsub, dl, Op.getValueType(),
5697 return DAG.getTargetExtractSubreg(AArch64::hsub, dl, Op.getValueType(),
5700 return DAG.getTargetExtractSubreg(AArch64::ssub, dl, Op.getValueType(),
5703 return DAG.getTargetExtractSubreg(AArch64::dsub, dl, Op.getValueType(),
5706 llvm_unreachable("Unexpected vector type in extract_subvector!");
5709 // If this is extracting the upper 64-bits of a 128-bit vector, we match
5711 if (Size == 64 && Val * VT.getVectorElementType().getSizeInBits() == 64)
5717 bool AArch64TargetLowering::isShuffleMaskLegal(const SmallVectorImpl<int> &M,
5719 if (VT.getVectorNumElements() == 4 &&
5720 (VT.is128BitVector() || VT.is64BitVector())) {
5721 unsigned PFIndexes[4];
5722 for (unsigned i = 0; i != 4; ++i) {
5726 PFIndexes[i] = M[i];
5729 // Compute the index in the perfect shuffle table.
5730 unsigned PFTableIndex = PFIndexes[0] * 9 * 9 * 9 + PFIndexes[1] * 9 * 9 +
5731 PFIndexes[2] * 9 + PFIndexes[3];
5732 unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
5733 unsigned Cost = (PFEntry >> 30);
5741 unsigned DummyUnsigned;
5743 return (ShuffleVectorSDNode::isSplatMask(&M[0], VT) || isREVMask(M, VT, 64) ||
5744 isREVMask(M, VT, 32) || isREVMask(M, VT, 16) ||
5745 isEXTMask(M, VT, DummyBool, DummyUnsigned) ||
5746 // isTBLMask(M, VT) || // FIXME: Port TBL support from ARM.
5747 isTRNMask(M, VT, DummyUnsigned) || isUZPMask(M, VT, DummyUnsigned) ||
5748 isZIPMask(M, VT, DummyUnsigned) ||
5749 isTRN_v_undef_Mask(M, VT, DummyUnsigned) ||
5750 isUZP_v_undef_Mask(M, VT, DummyUnsigned) ||
5751 isZIP_v_undef_Mask(M, VT, DummyUnsigned) ||
5752 isINSMask(M, VT.getVectorNumElements(), DummyBool, DummyInt) ||
5753 isConcatMask(M, VT, VT.getSizeInBits() == 128));
5756 /// getVShiftImm - Check if this is a valid build_vector for the immediate
5757 /// operand of a vector shift operation, where all the elements of the
5758 /// build_vector must have the same constant integer value.
5759 static bool getVShiftImm(SDValue Op, unsigned ElementBits, int64_t &Cnt) {
5760 // Ignore bit_converts.
5761 while (Op.getOpcode() == ISD::BITCAST)
5762 Op = Op.getOperand(0);
5763 BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(Op.getNode());
5764 APInt SplatBits, SplatUndef;
5765 unsigned SplatBitSize;
5767 if (!BVN || !BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize,
5768 HasAnyUndefs, ElementBits) ||
5769 SplatBitSize > ElementBits)
5771 Cnt = SplatBits.getSExtValue();
5775 /// isVShiftLImm - Check if this is a valid build_vector for the immediate
5776 /// operand of a vector shift left operation. That value must be in the range:
5777 /// 0 <= Value < ElementBits for a left shift; or
5778 /// 0 <= Value <= ElementBits for a long left shift.
5779 static bool isVShiftLImm(SDValue Op, EVT VT, bool isLong, int64_t &Cnt) {
5780 assert(VT.isVector() && "vector shift count is not a vector type");
5781 unsigned ElementBits = VT.getVectorElementType().getSizeInBits();
5782 if (!getVShiftImm(Op, ElementBits, Cnt))
5784 return (Cnt >= 0 && (isLong ? Cnt - 1 : Cnt) < ElementBits);
5787 /// isVShiftRImm - Check if this is a valid build_vector for the immediate
5788 /// operand of a vector shift right operation. For a shift opcode, the value
5789 /// is positive, but for an intrinsic the value count must be negative. The
5790 /// absolute value must be in the range:
5791 /// 1 <= |Value| <= ElementBits for a right shift; or
5792 /// 1 <= |Value| <= ElementBits/2 for a narrow right shift.
5793 static bool isVShiftRImm(SDValue Op, EVT VT, bool isNarrow, bool isIntrinsic,
5795 assert(VT.isVector() && "vector shift count is not a vector type");
5796 unsigned ElementBits = VT.getVectorElementType().getSizeInBits();
5797 if (!getVShiftImm(Op, ElementBits, Cnt))
5801 return (Cnt >= 1 && Cnt <= (isNarrow ? ElementBits / 2 : ElementBits));
5804 SDValue AArch64TargetLowering::LowerVectorSRA_SRL_SHL(SDValue Op,
5805 SelectionDAG &DAG) const {
5806 EVT VT = Op.getValueType();
5810 if (!Op.getOperand(1).getValueType().isVector())
5812 unsigned EltSize = VT.getVectorElementType().getSizeInBits();
5814 switch (Op.getOpcode()) {
5816 llvm_unreachable("unexpected shift opcode");
5819 if (isVShiftLImm(Op.getOperand(1), VT, false, Cnt) && Cnt < EltSize)
5820 return DAG.getNode(AArch64ISD::VSHL, SDLoc(Op), VT, Op.getOperand(0),
5821 DAG.getConstant(Cnt, MVT::i32));
5822 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DL, VT,
5823 DAG.getConstant(Intrinsic::aarch64_neon_ushl, MVT::i32),
5824 Op.getOperand(0), Op.getOperand(1));
5827 // Right shift immediate
5828 if (isVShiftRImm(Op.getOperand(1), VT, false, false, Cnt) &&
5831 (Op.getOpcode() == ISD::SRA) ? AArch64ISD::VASHR : AArch64ISD::VLSHR;
5832 return DAG.getNode(Opc, SDLoc(Op), VT, Op.getOperand(0),
5833 DAG.getConstant(Cnt, MVT::i32));
5836 // Right shift register. Note, there is not a shift right register
5837 // instruction, but the shift left register instruction takes a signed
5838 // value, where negative numbers specify a right shift.
5839 unsigned Opc = (Op.getOpcode() == ISD::SRA) ? Intrinsic::aarch64_neon_sshl
5840 : Intrinsic::aarch64_neon_ushl;
5841 // negate the shift amount
5842 SDValue NegShift = DAG.getNode(AArch64ISD::NEG, DL, VT, Op.getOperand(1));
5843 SDValue NegShiftLeft =
5844 DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DL, VT,
5845 DAG.getConstant(Opc, MVT::i32), Op.getOperand(0), NegShift);
5846 return NegShiftLeft;
5852 static SDValue EmitVectorComparison(SDValue LHS, SDValue RHS,
5853 AArch64CC::CondCode CC, bool NoNans, EVT VT,
5854 SDLoc dl, SelectionDAG &DAG) {
5855 EVT SrcVT = LHS.getValueType();
5857 BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(RHS.getNode());
5858 APInt CnstBits(VT.getSizeInBits(), 0);
5859 APInt UndefBits(VT.getSizeInBits(), 0);
5860 bool IsCnst = BVN && resolveBuildVector(BVN, CnstBits, UndefBits);
5861 bool IsZero = IsCnst && (CnstBits == 0);
5863 if (SrcVT.getVectorElementType().isFloatingPoint()) {
5867 case AArch64CC::NE: {
5870 Fcmeq = DAG.getNode(AArch64ISD::FCMEQz, dl, VT, LHS);
5872 Fcmeq = DAG.getNode(AArch64ISD::FCMEQ, dl, VT, LHS, RHS);
5873 return DAG.getNode(AArch64ISD::NOT, dl, VT, Fcmeq);
5877 return DAG.getNode(AArch64ISD::FCMEQz, dl, VT, LHS);
5878 return DAG.getNode(AArch64ISD::FCMEQ, dl, VT, LHS, RHS);
5881 return DAG.getNode(AArch64ISD::FCMGEz, dl, VT, LHS);
5882 return DAG.getNode(AArch64ISD::FCMGE, dl, VT, LHS, RHS);
5885 return DAG.getNode(AArch64ISD::FCMGTz, dl, VT, LHS);
5886 return DAG.getNode(AArch64ISD::FCMGT, dl, VT, LHS, RHS);
5889 return DAG.getNode(AArch64ISD::FCMLEz, dl, VT, LHS);
5890 return DAG.getNode(AArch64ISD::FCMGE, dl, VT, RHS, LHS);
5894 // If we ignore NaNs then we can use to the MI implementation.
5898 return DAG.getNode(AArch64ISD::FCMLTz, dl, VT, LHS);
5899 return DAG.getNode(AArch64ISD::FCMGT, dl, VT, RHS, LHS);
5906 case AArch64CC::NE: {
5909 Cmeq = DAG.getNode(AArch64ISD::CMEQz, dl, VT, LHS);
5911 Cmeq = DAG.getNode(AArch64ISD::CMEQ, dl, VT, LHS, RHS);
5912 return DAG.getNode(AArch64ISD::NOT, dl, VT, Cmeq);
5916 return DAG.getNode(AArch64ISD::CMEQz, dl, VT, LHS);
5917 return DAG.getNode(AArch64ISD::CMEQ, dl, VT, LHS, RHS);
5920 return DAG.getNode(AArch64ISD::CMGEz, dl, VT, LHS);
5921 return DAG.getNode(AArch64ISD::CMGE, dl, VT, LHS, RHS);
5924 return DAG.getNode(AArch64ISD::CMGTz, dl, VT, LHS);
5925 return DAG.getNode(AArch64ISD::CMGT, dl, VT, LHS, RHS);
5928 return DAG.getNode(AArch64ISD::CMLEz, dl, VT, LHS);
5929 return DAG.getNode(AArch64ISD::CMGE, dl, VT, RHS, LHS);
5931 return DAG.getNode(AArch64ISD::CMHS, dl, VT, RHS, LHS);
5933 return DAG.getNode(AArch64ISD::CMHI, dl, VT, RHS, LHS);
5936 return DAG.getNode(AArch64ISD::CMLTz, dl, VT, LHS);
5937 return DAG.getNode(AArch64ISD::CMGT, dl, VT, RHS, LHS);
5939 return DAG.getNode(AArch64ISD::CMHI, dl, VT, LHS, RHS);
5941 return DAG.getNode(AArch64ISD::CMHS, dl, VT, LHS, RHS);
5945 SDValue AArch64TargetLowering::LowerVSETCC(SDValue Op,
5946 SelectionDAG &DAG) const {
5947 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
5948 SDValue LHS = Op.getOperand(0);
5949 SDValue RHS = Op.getOperand(1);
5952 if (LHS.getValueType().getVectorElementType().isInteger()) {
5953 assert(LHS.getValueType() == RHS.getValueType());
5954 AArch64CC::CondCode AArch64CC = changeIntCCToAArch64CC(CC);
5955 return EmitVectorComparison(LHS, RHS, AArch64CC, false, Op.getValueType(),
5959 assert(LHS.getValueType().getVectorElementType() == MVT::f32 ||
5960 LHS.getValueType().getVectorElementType() == MVT::f64);
5962 // Unfortunately, the mapping of LLVM FP CC's onto AArch64 CC's isn't totally
5963 // clean. Some of them require two branches to implement.
5964 AArch64CC::CondCode CC1, CC2;
5966 changeVectorFPCCToAArch64CC(CC, CC1, CC2, ShouldInvert);
5968 bool NoNaNs = getTargetMachine().Options.NoNaNsFPMath;
5970 EmitVectorComparison(LHS, RHS, CC1, NoNaNs, Op.getValueType(), dl, DAG);
5974 if (CC2 != AArch64CC::AL) {
5976 EmitVectorComparison(LHS, RHS, CC2, NoNaNs, Op.getValueType(), dl, DAG);
5977 if (!Cmp2.getNode())
5980 Cmp = DAG.getNode(ISD::OR, dl, Cmp.getValueType(), Cmp, Cmp2);
5984 return Cmp = DAG.getNOT(dl, Cmp, Cmp.getValueType());
5989 /// getTgtMemIntrinsic - Represent NEON load and store intrinsics as
5990 /// MemIntrinsicNodes. The associated MachineMemOperands record the alignment
5991 /// specified in the intrinsic calls.
5992 bool AArch64TargetLowering::getTgtMemIntrinsic(IntrinsicInfo &Info,
5994 unsigned Intrinsic) const {
5995 switch (Intrinsic) {
5996 case Intrinsic::aarch64_neon_ld2:
5997 case Intrinsic::aarch64_neon_ld3:
5998 case Intrinsic::aarch64_neon_ld4:
5999 case Intrinsic::aarch64_neon_ld1x2:
6000 case Intrinsic::aarch64_neon_ld1x3:
6001 case Intrinsic::aarch64_neon_ld1x4:
6002 case Intrinsic::aarch64_neon_ld2lane:
6003 case Intrinsic::aarch64_neon_ld3lane:
6004 case Intrinsic::aarch64_neon_ld4lane:
6005 case Intrinsic::aarch64_neon_ld2r:
6006 case Intrinsic::aarch64_neon_ld3r:
6007 case Intrinsic::aarch64_neon_ld4r: {
6008 Info.opc = ISD::INTRINSIC_W_CHAIN;
6009 // Conservatively set memVT to the entire set of vectors loaded.
6010 uint64_t NumElts = getDataLayout()->getTypeAllocSize(I.getType()) / 8;
6011 Info.memVT = EVT::getVectorVT(I.getType()->getContext(), MVT::i64, NumElts);
6012 Info.ptrVal = I.getArgOperand(I.getNumArgOperands() - 1);
6015 Info.vol = false; // volatile loads with NEON intrinsics not supported
6016 Info.readMem = true;
6017 Info.writeMem = false;
6020 case Intrinsic::aarch64_neon_st2:
6021 case Intrinsic::aarch64_neon_st3:
6022 case Intrinsic::aarch64_neon_st4:
6023 case Intrinsic::aarch64_neon_st1x2:
6024 case Intrinsic::aarch64_neon_st1x3:
6025 case Intrinsic::aarch64_neon_st1x4:
6026 case Intrinsic::aarch64_neon_st2lane:
6027 case Intrinsic::aarch64_neon_st3lane:
6028 case Intrinsic::aarch64_neon_st4lane: {
6029 Info.opc = ISD::INTRINSIC_VOID;
6030 // Conservatively set memVT to the entire set of vectors stored.
6031 unsigned NumElts = 0;
6032 for (unsigned ArgI = 1, ArgE = I.getNumArgOperands(); ArgI < ArgE; ++ArgI) {
6033 Type *ArgTy = I.getArgOperand(ArgI)->getType();
6034 if (!ArgTy->isVectorTy())
6036 NumElts += getDataLayout()->getTypeAllocSize(ArgTy) / 8;
6038 Info.memVT = EVT::getVectorVT(I.getType()->getContext(), MVT::i64, NumElts);
6039 Info.ptrVal = I.getArgOperand(I.getNumArgOperands() - 1);
6042 Info.vol = false; // volatile stores with NEON intrinsics not supported
6043 Info.readMem = false;
6044 Info.writeMem = true;
6047 case Intrinsic::aarch64_ldaxr:
6048 case Intrinsic::aarch64_ldxr: {
6049 PointerType *PtrTy = cast<PointerType>(I.getArgOperand(0)->getType());
6050 Info.opc = ISD::INTRINSIC_W_CHAIN;
6051 Info.memVT = MVT::getVT(PtrTy->getElementType());
6052 Info.ptrVal = I.getArgOperand(0);
6054 Info.align = getDataLayout()->getABITypeAlignment(PtrTy->getElementType());
6056 Info.readMem = true;
6057 Info.writeMem = false;
6060 case Intrinsic::aarch64_stlxr:
6061 case Intrinsic::aarch64_stxr: {
6062 PointerType *PtrTy = cast<PointerType>(I.getArgOperand(1)->getType());
6063 Info.opc = ISD::INTRINSIC_W_CHAIN;
6064 Info.memVT = MVT::getVT(PtrTy->getElementType());
6065 Info.ptrVal = I.getArgOperand(1);
6067 Info.align = getDataLayout()->getABITypeAlignment(PtrTy->getElementType());
6069 Info.readMem = false;
6070 Info.writeMem = true;
6073 case Intrinsic::aarch64_ldaxp:
6074 case Intrinsic::aarch64_ldxp: {
6075 Info.opc = ISD::INTRINSIC_W_CHAIN;
6076 Info.memVT = MVT::i128;
6077 Info.ptrVal = I.getArgOperand(0);
6081 Info.readMem = true;
6082 Info.writeMem = false;
6085 case Intrinsic::aarch64_stlxp:
6086 case Intrinsic::aarch64_stxp: {
6087 Info.opc = ISD::INTRINSIC_W_CHAIN;
6088 Info.memVT = MVT::i128;
6089 Info.ptrVal = I.getArgOperand(2);
6093 Info.readMem = false;
6094 Info.writeMem = true;
6104 // Truncations from 64-bit GPR to 32-bit GPR is free.
6105 bool AArch64TargetLowering::isTruncateFree(Type *Ty1, Type *Ty2) const {
6106 if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy())
6108 unsigned NumBits1 = Ty1->getPrimitiveSizeInBits();
6109 unsigned NumBits2 = Ty2->getPrimitiveSizeInBits();
6110 return NumBits1 > NumBits2;
6112 bool AArch64TargetLowering::isTruncateFree(EVT VT1, EVT VT2) const {
6113 if (VT1.isVector() || VT2.isVector() || !VT1.isInteger() || !VT2.isInteger())
6115 unsigned NumBits1 = VT1.getSizeInBits();
6116 unsigned NumBits2 = VT2.getSizeInBits();
6117 return NumBits1 > NumBits2;
6120 // All 32-bit GPR operations implicitly zero the high-half of the corresponding
6122 bool AArch64TargetLowering::isZExtFree(Type *Ty1, Type *Ty2) const {
6123 if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy())
6125 unsigned NumBits1 = Ty1->getPrimitiveSizeInBits();
6126 unsigned NumBits2 = Ty2->getPrimitiveSizeInBits();
6127 return NumBits1 == 32 && NumBits2 == 64;
6129 bool AArch64TargetLowering::isZExtFree(EVT VT1, EVT VT2) const {
6130 if (VT1.isVector() || VT2.isVector() || !VT1.isInteger() || !VT2.isInteger())
6132 unsigned NumBits1 = VT1.getSizeInBits();
6133 unsigned NumBits2 = VT2.getSizeInBits();
6134 return NumBits1 == 32 && NumBits2 == 64;
6137 bool AArch64TargetLowering::isZExtFree(SDValue Val, EVT VT2) const {
6138 EVT VT1 = Val.getValueType();
6139 if (isZExtFree(VT1, VT2)) {
6143 if (Val.getOpcode() != ISD::LOAD)
6146 // 8-, 16-, and 32-bit integer loads all implicitly zero-extend.
6147 return (VT1.isSimple() && !VT1.isVector() && VT1.isInteger() &&
6148 VT2.isSimple() && !VT2.isVector() && VT2.isInteger() &&
6149 VT1.getSizeInBits() <= 32);
6152 bool AArch64TargetLowering::hasPairedLoad(Type *LoadedType,
6153 unsigned &RequiredAligment) const {
6154 if (!LoadedType->isIntegerTy() && !LoadedType->isFloatTy())
6156 // Cyclone supports unaligned accesses.
6157 RequiredAligment = 0;
6158 unsigned NumBits = LoadedType->getPrimitiveSizeInBits();
6159 return NumBits == 32 || NumBits == 64;
6162 bool AArch64TargetLowering::hasPairedLoad(EVT LoadedType,
6163 unsigned &RequiredAligment) const {
6164 if (!LoadedType.isSimple() ||
6165 (!LoadedType.isInteger() && !LoadedType.isFloatingPoint()))
6167 // Cyclone supports unaligned accesses.
6168 RequiredAligment = 0;
6169 unsigned NumBits = LoadedType.getSizeInBits();
6170 return NumBits == 32 || NumBits == 64;
6173 static bool memOpAlign(unsigned DstAlign, unsigned SrcAlign,
6174 unsigned AlignCheck) {
6175 return ((SrcAlign == 0 || SrcAlign % AlignCheck == 0) &&
6176 (DstAlign == 0 || DstAlign % AlignCheck == 0));
6179 EVT AArch64TargetLowering::getOptimalMemOpType(uint64_t Size, unsigned DstAlign,
6180 unsigned SrcAlign, bool IsMemset,
6183 MachineFunction &MF) const {
6184 // Don't use AdvSIMD to implement 16-byte memset. It would have taken one
6185 // instruction to materialize the v2i64 zero and one store (with restrictive
6186 // addressing mode). Just do two i64 store of zero-registers.
6188 const Function *F = MF.getFunction();
6189 if (Subtarget->hasFPARMv8() && !IsMemset && Size >= 16 &&
6190 !F->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
6191 Attribute::NoImplicitFloat) &&
6192 (memOpAlign(SrcAlign, DstAlign, 16) ||
6193 (allowsUnalignedMemoryAccesses(MVT::f128, 0, &Fast) && Fast)))
6196 return Size >= 8 ? MVT::i64 : MVT::i32;
6199 // 12-bit optionally shifted immediates are legal for adds.
6200 bool AArch64TargetLowering::isLegalAddImmediate(int64_t Immed) const {
6201 if ((Immed >> 12) == 0 || ((Immed & 0xfff) == 0 && Immed >> 24 == 0))
6206 // Integer comparisons are implemented with ADDS/SUBS, so the range of valid
6207 // immediates is the same as for an add or a sub.
6208 bool AArch64TargetLowering::isLegalICmpImmediate(int64_t Immed) const {
6211 return isLegalAddImmediate(Immed);
6214 /// isLegalAddressingMode - Return true if the addressing mode represented
6215 /// by AM is legal for this target, for a load/store of the specified type.
6216 bool AArch64TargetLowering::isLegalAddressingMode(const AddrMode &AM,
6218 // AArch64 has five basic addressing modes:
6220 // reg + 9-bit signed offset
6221 // reg + SIZE_IN_BYTES * 12-bit unsigned offset
6223 // reg + SIZE_IN_BYTES * reg
6225 // No global is ever allowed as a base.
6229 // No reg+reg+imm addressing.
6230 if (AM.HasBaseReg && AM.BaseOffs && AM.Scale)
6233 // check reg + imm case:
6234 // i.e., reg + 0, reg + imm9, reg + SIZE_IN_BYTES * uimm12
6235 uint64_t NumBytes = 0;
6236 if (Ty->isSized()) {
6237 uint64_t NumBits = getDataLayout()->getTypeSizeInBits(Ty);
6238 NumBytes = NumBits / 8;
6239 if (!isPowerOf2_64(NumBits))
6244 int64_t Offset = AM.BaseOffs;
6246 // 9-bit signed offset
6247 if (Offset >= -(1LL << 9) && Offset <= (1LL << 9) - 1)
6250 // 12-bit unsigned offset
6251 unsigned shift = Log2_64(NumBytes);
6252 if (NumBytes && Offset > 0 && (Offset / NumBytes) <= (1LL << 12) - 1 &&
6253 // Must be a multiple of NumBytes (NumBytes is a power of 2)
6254 (Offset >> shift) << shift == Offset)
6259 // Check reg1 + SIZE_IN_BYTES * reg2 and reg1 + reg2
6261 if (!AM.Scale || AM.Scale == 1 ||
6262 (AM.Scale > 0 && (uint64_t)AM.Scale == NumBytes))
6267 int AArch64TargetLowering::getScalingFactorCost(const AddrMode &AM,
6269 // Scaling factors are not free at all.
6270 // Operands | Rt Latency
6271 // -------------------------------------------
6273 // -------------------------------------------
6274 // Rt, [Xn, Xm, lsl #imm] | Rn: 4 Rm: 5
6275 // Rt, [Xn, Wm, <extend> #imm] |
6276 if (isLegalAddressingMode(AM, Ty))
6277 // Scale represents reg2 * scale, thus account for 1 if
6278 // it is not equal to 0 or 1.
6279 return AM.Scale != 0 && AM.Scale != 1;
6283 bool AArch64TargetLowering::isFMAFasterThanFMulAndFAdd(EVT VT) const {
6284 VT = VT.getScalarType();
6289 switch (VT.getSimpleVT().SimpleTy) {
6301 AArch64TargetLowering::getScratchRegisters(CallingConv::ID) const {
6302 // LR is a callee-save register, but we must treat it as clobbered by any call
6303 // site. Hence we include LR in the scratch registers, which are in turn added
6304 // as implicit-defs for stackmaps and patchpoints.
6305 static const MCPhysReg ScratchRegs[] = {
6306 AArch64::X16, AArch64::X17, AArch64::LR, 0
6312 AArch64TargetLowering::isDesirableToCommuteWithShift(const SDNode *N) const {
6313 EVT VT = N->getValueType(0);
6314 // If N is unsigned bit extraction: ((x >> C) & mask), then do not combine
6315 // it with shift to let it be lowered to UBFX.
6316 if (N->getOpcode() == ISD::AND && (VT == MVT::i32 || VT == MVT::i64) &&
6317 isa<ConstantSDNode>(N->getOperand(1))) {
6318 uint64_t TruncMask = N->getConstantOperandVal(1);
6319 if (isMask_64(TruncMask) &&
6320 N->getOperand(0).getOpcode() == ISD::SRL &&
6321 isa<ConstantSDNode>(N->getOperand(0)->getOperand(1)))
6327 bool AArch64TargetLowering::shouldConvertConstantLoadToIntImm(const APInt &Imm,
6329 assert(Ty->isIntegerTy());
6331 unsigned BitSize = Ty->getPrimitiveSizeInBits();
6335 int64_t Val = Imm.getSExtValue();
6336 if (Val == 0 || AArch64_AM::isLogicalImmediate(Val, BitSize))
6339 if ((int64_t)Val < 0)
6342 Val &= (1LL << 32) - 1;
6344 unsigned LZ = countLeadingZeros((uint64_t)Val);
6345 unsigned Shift = (63 - LZ) / 16;
6346 // MOVZ is free so return true for one or fewer MOVK.
6347 return (Shift < 3) ? true : false;
6350 // Generate SUBS and CSEL for integer abs.
6351 static SDValue performIntegerAbsCombine(SDNode *N, SelectionDAG &DAG) {
6352 EVT VT = N->getValueType(0);
6354 SDValue N0 = N->getOperand(0);
6355 SDValue N1 = N->getOperand(1);
6358 // Check pattern of XOR(ADD(X,Y), Y) where Y is SRA(X, size(X)-1)
6359 // and change it to SUB and CSEL.
6360 if (VT.isInteger() && N->getOpcode() == ISD::XOR &&
6361 N0.getOpcode() == ISD::ADD && N0.getOperand(1) == N1 &&
6362 N1.getOpcode() == ISD::SRA && N1.getOperand(0) == N0.getOperand(0))
6363 if (ConstantSDNode *Y1C = dyn_cast<ConstantSDNode>(N1.getOperand(1)))
6364 if (Y1C->getAPIntValue() == VT.getSizeInBits() - 1) {
6365 SDValue Neg = DAG.getNode(ISD::SUB, DL, VT, DAG.getConstant(0, VT),
6367 // Generate SUBS & CSEL.
6369 DAG.getNode(AArch64ISD::SUBS, DL, DAG.getVTList(VT, MVT::i32),
6370 N0.getOperand(0), DAG.getConstant(0, VT));
6371 return DAG.getNode(AArch64ISD::CSEL, DL, VT, N0.getOperand(0), Neg,
6372 DAG.getConstant(AArch64CC::PL, MVT::i32),
6373 SDValue(Cmp.getNode(), 1));
6378 // performXorCombine - Attempts to handle integer ABS.
6379 static SDValue performXorCombine(SDNode *N, SelectionDAG &DAG,
6380 TargetLowering::DAGCombinerInfo &DCI,
6381 const AArch64Subtarget *Subtarget) {
6382 if (DCI.isBeforeLegalizeOps())
6385 return performIntegerAbsCombine(N, DAG);
6388 static SDValue performMulCombine(SDNode *N, SelectionDAG &DAG,
6389 TargetLowering::DAGCombinerInfo &DCI,
6390 const AArch64Subtarget *Subtarget) {
6391 if (DCI.isBeforeLegalizeOps())
6394 // Multiplication of a power of two plus/minus one can be done more
6395 // cheaply as as shift+add/sub. For now, this is true unilaterally. If
6396 // future CPUs have a cheaper MADD instruction, this may need to be
6397 // gated on a subtarget feature. For Cyclone, 32-bit MADD is 4 cycles and
6398 // 64-bit is 5 cycles, so this is always a win.
6399 if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(1))) {
6400 APInt Value = C->getAPIntValue();
6401 EVT VT = N->getValueType(0);
6402 if (Value.isNonNegative()) {
6403 // (mul x, 2^N + 1) => (add (shl x, N), x)
6404 APInt VM1 = Value - 1;
6405 if (VM1.isPowerOf2()) {
6406 SDValue ShiftedVal =
6407 DAG.getNode(ISD::SHL, SDLoc(N), VT, N->getOperand(0),
6408 DAG.getConstant(VM1.logBase2(), MVT::i64));
6409 return DAG.getNode(ISD::ADD, SDLoc(N), VT, ShiftedVal,
6412 // (mul x, 2^N - 1) => (sub (shl x, N), x)
6413 APInt VP1 = Value + 1;
6414 if (VP1.isPowerOf2()) {
6415 SDValue ShiftedVal =
6416 DAG.getNode(ISD::SHL, SDLoc(N), VT, N->getOperand(0),
6417 DAG.getConstant(VP1.logBase2(), MVT::i64));
6418 return DAG.getNode(ISD::SUB, SDLoc(N), VT, ShiftedVal,
6422 // (mul x, -(2^N + 1)) => - (add (shl x, N), x)
6423 APInt VNM1 = -Value - 1;
6424 if (VNM1.isPowerOf2()) {
6425 SDValue ShiftedVal =
6426 DAG.getNode(ISD::SHL, SDLoc(N), VT, N->getOperand(0),
6427 DAG.getConstant(VNM1.logBase2(), MVT::i64));
6429 DAG.getNode(ISD::ADD, SDLoc(N), VT, ShiftedVal, N->getOperand(0));
6430 return DAG.getNode(ISD::SUB, SDLoc(N), VT, DAG.getConstant(0, VT), Add);
6432 // (mul x, -(2^N - 1)) => (sub x, (shl x, N))
6433 APInt VNP1 = -Value + 1;
6434 if (VNP1.isPowerOf2()) {
6435 SDValue ShiftedVal =
6436 DAG.getNode(ISD::SHL, SDLoc(N), VT, N->getOperand(0),
6437 DAG.getConstant(VNP1.logBase2(), MVT::i64));
6438 return DAG.getNode(ISD::SUB, SDLoc(N), VT, N->getOperand(0),
6446 static SDValue performVectorCompareAndMaskUnaryOpCombine(SDNode *N,
6447 SelectionDAG &DAG) {
6448 // Take advantage of vector comparisons producing 0 or -1 in each lane to
6449 // optimize away operation when it's from a constant.
6451 // The general transformation is:
6452 // UNARYOP(AND(VECTOR_CMP(x,y), constant)) -->
6453 // AND(VECTOR_CMP(x,y), constant2)
6454 // constant2 = UNARYOP(constant)
6456 // Early exit if this isn't a vector operation, the operand of the
6457 // unary operation isn't a bitwise AND, or if the sizes of the operations
6459 EVT VT = N->getValueType(0);
6460 if (!VT.isVector() || N->getOperand(0)->getOpcode() != ISD::AND ||
6461 N->getOperand(0)->getOperand(0)->getOpcode() != ISD::SETCC ||
6462 VT.getSizeInBits() != N->getOperand(0)->getValueType(0).getSizeInBits())
6465 // Now check that the other operand of the AND is a constant splat. We could
6466 // make the transformation for non-constant splats as well, but it's unclear
6467 // that would be a benefit as it would not eliminate any operations, just
6468 // perform one more step in scalar code before moving to the vector unit.
6469 if (BuildVectorSDNode *BV =
6470 dyn_cast<BuildVectorSDNode>(N->getOperand(0)->getOperand(1))) {
6471 // Bail out if the vector isn't a constant splat.
6472 if (!BV->getConstantSplatNode())
6475 // Everything checks out. Build up the new and improved node.
6477 EVT IntVT = BV->getValueType(0);
6478 // Create a new constant of the appropriate type for the transformed
6480 SDValue SourceConst = DAG.getNode(N->getOpcode(), DL, VT, SDValue(BV, 0));
6481 // The AND node needs bitcasts to/from an integer vector type around it.
6482 SDValue MaskConst = DAG.getNode(ISD::BITCAST, DL, IntVT, SourceConst);
6483 SDValue NewAnd = DAG.getNode(ISD::AND, DL, IntVT,
6484 N->getOperand(0)->getOperand(0), MaskConst);
6485 SDValue Res = DAG.getNode(ISD::BITCAST, DL, VT, NewAnd);
6492 static SDValue performIntToFpCombine(SDNode *N, SelectionDAG &DAG) {
6493 // First try to optimize away the conversion when it's conditionally from
6494 // a constant. Vectors only.
6495 SDValue Res = performVectorCompareAndMaskUnaryOpCombine(N, DAG);
6496 if (Res != SDValue())
6499 EVT VT = N->getValueType(0);
6500 if (VT != MVT::f32 && VT != MVT::f64)
6503 // Only optimize when the source and destination types have the same width.
6504 if (VT.getSizeInBits() != N->getOperand(0).getValueType().getSizeInBits())
6507 // If the result of an integer load is only used by an integer-to-float
6508 // conversion, use a fp load instead and a AdvSIMD scalar {S|U}CVTF instead.
6509 // This eliminates an "integer-to-vector-move UOP and improve throughput.
6510 SDValue N0 = N->getOperand(0);
6511 if (ISD::isNormalLoad(N0.getNode()) && N0.hasOneUse() &&
6512 // Do not change the width of a volatile load.
6513 !cast<LoadSDNode>(N0)->isVolatile()) {
6514 LoadSDNode *LN0 = cast<LoadSDNode>(N0);
6515 SDValue Load = DAG.getLoad(VT, SDLoc(N), LN0->getChain(), LN0->getBasePtr(),
6516 LN0->getPointerInfo(), LN0->isVolatile(),
6517 LN0->isNonTemporal(), LN0->isInvariant(),
6518 LN0->getAlignment());
6520 // Make sure successors of the original load stay after it by updating them
6521 // to use the new Chain.
6522 DAG.ReplaceAllUsesOfValueWith(SDValue(LN0, 1), Load.getValue(1));
6525 (N->getOpcode() == ISD::SINT_TO_FP) ? AArch64ISD::SITOF : AArch64ISD::UITOF;
6526 return DAG.getNode(Opcode, SDLoc(N), VT, Load);
6532 /// An EXTR instruction is made up of two shifts, ORed together. This helper
6533 /// searches for and classifies those shifts.
6534 static bool findEXTRHalf(SDValue N, SDValue &Src, uint32_t &ShiftAmount,
6536 if (N.getOpcode() == ISD::SHL)
6538 else if (N.getOpcode() == ISD::SRL)
6543 if (!isa<ConstantSDNode>(N.getOperand(1)))
6546 ShiftAmount = N->getConstantOperandVal(1);
6547 Src = N->getOperand(0);
6551 /// EXTR instruction extracts a contiguous chunk of bits from two existing
6552 /// registers viewed as a high/low pair. This function looks for the pattern:
6553 /// (or (shl VAL1, #N), (srl VAL2, #RegWidth-N)) and replaces it with an
6554 /// EXTR. Can't quite be done in TableGen because the two immediates aren't
6556 static SDValue tryCombineToEXTR(SDNode *N,
6557 TargetLowering::DAGCombinerInfo &DCI) {
6558 SelectionDAG &DAG = DCI.DAG;
6560 EVT VT = N->getValueType(0);
6562 assert(N->getOpcode() == ISD::OR && "Unexpected root");
6564 if (VT != MVT::i32 && VT != MVT::i64)
6568 uint32_t ShiftLHS = 0;
6570 if (!findEXTRHalf(N->getOperand(0), LHS, ShiftLHS, LHSFromHi))
6574 uint32_t ShiftRHS = 0;
6576 if (!findEXTRHalf(N->getOperand(1), RHS, ShiftRHS, RHSFromHi))
6579 // If they're both trying to come from the high part of the register, they're
6580 // not really an EXTR.
6581 if (LHSFromHi == RHSFromHi)
6584 if (ShiftLHS + ShiftRHS != VT.getSizeInBits())
6588 std::swap(LHS, RHS);
6589 std::swap(ShiftLHS, ShiftRHS);
6592 return DAG.getNode(AArch64ISD::EXTR, DL, VT, LHS, RHS,
6593 DAG.getConstant(ShiftRHS, MVT::i64));
6596 static SDValue tryCombineToBSL(SDNode *N,
6597 TargetLowering::DAGCombinerInfo &DCI) {
6598 EVT VT = N->getValueType(0);
6599 SelectionDAG &DAG = DCI.DAG;
6605 SDValue N0 = N->getOperand(0);
6606 if (N0.getOpcode() != ISD::AND)
6609 SDValue N1 = N->getOperand(1);
6610 if (N1.getOpcode() != ISD::AND)
6613 // We only have to look for constant vectors here since the general, variable
6614 // case can be handled in TableGen.
6615 unsigned Bits = VT.getVectorElementType().getSizeInBits();
6616 uint64_t BitMask = Bits == 64 ? -1ULL : ((1ULL << Bits) - 1);
6617 for (int i = 1; i >= 0; --i)
6618 for (int j = 1; j >= 0; --j) {
6619 BuildVectorSDNode *BVN0 = dyn_cast<BuildVectorSDNode>(N0->getOperand(i));
6620 BuildVectorSDNode *BVN1 = dyn_cast<BuildVectorSDNode>(N1->getOperand(j));
6624 bool FoundMatch = true;
6625 for (unsigned k = 0; k < VT.getVectorNumElements(); ++k) {
6626 ConstantSDNode *CN0 = dyn_cast<ConstantSDNode>(BVN0->getOperand(k));
6627 ConstantSDNode *CN1 = dyn_cast<ConstantSDNode>(BVN1->getOperand(k));
6629 CN0->getZExtValue() != (BitMask & ~CN1->getZExtValue())) {
6636 return DAG.getNode(AArch64ISD::BSL, DL, VT, SDValue(BVN0, 0),
6637 N0->getOperand(1 - i), N1->getOperand(1 - j));
6643 static SDValue performORCombine(SDNode *N, TargetLowering::DAGCombinerInfo &DCI,
6644 const AArch64Subtarget *Subtarget) {
6645 // Attempt to form an EXTR from (or (shl VAL1, #N), (srl VAL2, #RegWidth-N))
6646 if (!EnableAArch64ExtrGeneration)
6648 SelectionDAG &DAG = DCI.DAG;
6649 EVT VT = N->getValueType(0);
6651 if (!DAG.getTargetLoweringInfo().isTypeLegal(VT))
6654 SDValue Res = tryCombineToEXTR(N, DCI);
6658 Res = tryCombineToBSL(N, DCI);
6665 static SDValue performBitcastCombine(SDNode *N,
6666 TargetLowering::DAGCombinerInfo &DCI,
6667 SelectionDAG &DAG) {
6668 // Wait 'til after everything is legalized to try this. That way we have
6669 // legal vector types and such.
6670 if (DCI.isBeforeLegalizeOps())
6673 // Remove extraneous bitcasts around an extract_subvector.
6675 // (v4i16 (bitconvert
6676 // (extract_subvector (v2i64 (bitconvert (v8i16 ...)), (i64 1)))))
6678 // (extract_subvector ((v8i16 ...), (i64 4)))
6680 // Only interested in 64-bit vectors as the ultimate result.
6681 EVT VT = N->getValueType(0);
6684 if (VT.getSimpleVT().getSizeInBits() != 64)
6686 // Is the operand an extract_subvector starting at the beginning or halfway
6687 // point of the vector? A low half may also come through as an
6688 // EXTRACT_SUBREG, so look for that, too.
6689 SDValue Op0 = N->getOperand(0);
6690 if (Op0->getOpcode() != ISD::EXTRACT_SUBVECTOR &&
6691 !(Op0->isMachineOpcode() &&
6692 Op0->getMachineOpcode() == AArch64::EXTRACT_SUBREG))
6694 uint64_t idx = cast<ConstantSDNode>(Op0->getOperand(1))->getZExtValue();
6695 if (Op0->getOpcode() == ISD::EXTRACT_SUBVECTOR) {
6696 if (Op0->getValueType(0).getVectorNumElements() != idx && idx != 0)
6698 } else if (Op0->getMachineOpcode() == AArch64::EXTRACT_SUBREG) {
6699 if (idx != AArch64::dsub)
6701 // The dsub reference is equivalent to a lane zero subvector reference.
6704 // Look through the bitcast of the input to the extract.
6705 if (Op0->getOperand(0)->getOpcode() != ISD::BITCAST)
6707 SDValue Source = Op0->getOperand(0)->getOperand(0);
6708 // If the source type has twice the number of elements as our destination
6709 // type, we know this is an extract of the high or low half of the vector.
6710 EVT SVT = Source->getValueType(0);
6711 if (SVT.getVectorNumElements() != VT.getVectorNumElements() * 2)
6714 DEBUG(dbgs() << "aarch64-lower: bitcast extract_subvector simplification\n");
6716 // Create the simplified form to just extract the low or high half of the
6717 // vector directly rather than bothering with the bitcasts.
6719 unsigned NumElements = VT.getVectorNumElements();
6721 SDValue HalfIdx = DAG.getConstant(NumElements, MVT::i64);
6722 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT, Source, HalfIdx);
6724 SDValue SubReg = DAG.getTargetConstant(AArch64::dsub, MVT::i32);
6725 return SDValue(DAG.getMachineNode(TargetOpcode::EXTRACT_SUBREG, dl, VT,
6731 static SDValue performConcatVectorsCombine(SDNode *N,
6732 TargetLowering::DAGCombinerInfo &DCI,
6733 SelectionDAG &DAG) {
6734 // Wait 'til after everything is legalized to try this. That way we have
6735 // legal vector types and such.
6736 if (DCI.isBeforeLegalizeOps())
6740 EVT VT = N->getValueType(0);
6742 // If we see a (concat_vectors (v1x64 A), (v1x64 A)) it's really a vector
6743 // splat. The indexed instructions are going to be expecting a DUPLANE64, so
6744 // canonicalise to that.
6745 if (N->getOperand(0) == N->getOperand(1) && VT.getVectorNumElements() == 2) {
6746 assert(VT.getVectorElementType().getSizeInBits() == 64);
6747 return DAG.getNode(AArch64ISD::DUPLANE64, dl, VT,
6748 WidenVector(N->getOperand(0), DAG),
6749 DAG.getConstant(0, MVT::i64));
6752 // Canonicalise concat_vectors so that the right-hand vector has as few
6753 // bit-casts as possible before its real operation. The primary matching
6754 // destination for these operations will be the narrowing "2" instructions,
6755 // which depend on the operation being performed on this right-hand vector.
6757 // (concat_vectors LHS, (v1i64 (bitconvert (v4i16 RHS))))
6759 // (bitconvert (concat_vectors (v4i16 (bitconvert LHS)), RHS))
6761 SDValue Op1 = N->getOperand(1);
6762 if (Op1->getOpcode() != ISD::BITCAST)
6764 SDValue RHS = Op1->getOperand(0);
6765 MVT RHSTy = RHS.getValueType().getSimpleVT();
6766 // If the RHS is not a vector, this is not the pattern we're looking for.
6767 if (!RHSTy.isVector())
6770 DEBUG(dbgs() << "aarch64-lower: concat_vectors bitcast simplification\n");
6772 MVT ConcatTy = MVT::getVectorVT(RHSTy.getVectorElementType(),
6773 RHSTy.getVectorNumElements() * 2);
6775 ISD::BITCAST, dl, VT,
6776 DAG.getNode(ISD::CONCAT_VECTORS, dl, ConcatTy,
6777 DAG.getNode(ISD::BITCAST, dl, RHSTy, N->getOperand(0)), RHS));
6780 static SDValue tryCombineFixedPointConvert(SDNode *N,
6781 TargetLowering::DAGCombinerInfo &DCI,
6782 SelectionDAG &DAG) {
6783 // Wait 'til after everything is legalized to try this. That way we have
6784 // legal vector types and such.
6785 if (DCI.isBeforeLegalizeOps())
6787 // Transform a scalar conversion of a value from a lane extract into a
6788 // lane extract of a vector conversion. E.g., from foo1 to foo2:
6789 // double foo1(int64x2_t a) { return vcvtd_n_f64_s64(a[1], 9); }
6790 // double foo2(int64x2_t a) { return vcvtq_n_f64_s64(a, 9)[1]; }
6792 // The second form interacts better with instruction selection and the
6793 // register allocator to avoid cross-class register copies that aren't
6794 // coalescable due to a lane reference.
6796 // Check the operand and see if it originates from a lane extract.
6797 SDValue Op1 = N->getOperand(1);
6798 if (Op1.getOpcode() == ISD::EXTRACT_VECTOR_ELT) {
6799 // Yep, no additional predication needed. Perform the transform.
6800 SDValue IID = N->getOperand(0);
6801 SDValue Shift = N->getOperand(2);
6802 SDValue Vec = Op1.getOperand(0);
6803 SDValue Lane = Op1.getOperand(1);
6804 EVT ResTy = N->getValueType(0);
6808 // The vector width should be 128 bits by the time we get here, even
6809 // if it started as 64 bits (the extract_vector handling will have
6811 assert(Vec.getValueType().getSizeInBits() == 128 &&
6812 "unexpected vector size on extract_vector_elt!");
6813 if (Vec.getValueType() == MVT::v4i32)
6814 VecResTy = MVT::v4f32;
6815 else if (Vec.getValueType() == MVT::v2i64)
6816 VecResTy = MVT::v2f64;
6818 llvm_unreachable("unexpected vector type!");
6821 DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DL, VecResTy, IID, Vec, Shift);
6822 return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, ResTy, Convert, Lane);
6827 // AArch64 high-vector "long" operations are formed by performing the non-high
6828 // version on an extract_subvector of each operand which gets the high half:
6830 // (longop2 LHS, RHS) == (longop (extract_high LHS), (extract_high RHS))
6832 // However, there are cases which don't have an extract_high explicitly, but
6833 // have another operation that can be made compatible with one for free. For
6836 // (dupv64 scalar) --> (extract_high (dup128 scalar))
6838 // This routine does the actual conversion of such DUPs, once outer routines
6839 // have determined that everything else is in order.
6840 static SDValue tryExtendDUPToExtractHigh(SDValue N, SelectionDAG &DAG) {
6841 // We can handle most types of duplicate, but the lane ones have an extra
6842 // operand saying *which* lane, so we need to know.
6844 switch (N.getOpcode()) {
6845 case AArch64ISD::DUP:
6848 case AArch64ISD::DUPLANE8:
6849 case AArch64ISD::DUPLANE16:
6850 case AArch64ISD::DUPLANE32:
6851 case AArch64ISD::DUPLANE64:
6858 MVT NarrowTy = N.getSimpleValueType();
6859 if (!NarrowTy.is64BitVector())
6862 MVT ElementTy = NarrowTy.getVectorElementType();
6863 unsigned NumElems = NarrowTy.getVectorNumElements();
6864 MVT NewDUPVT = MVT::getVectorVT(ElementTy, NumElems * 2);
6868 NewDUP = DAG.getNode(N.getOpcode(), SDLoc(N), NewDUPVT, N.getOperand(0),
6871 NewDUP = DAG.getNode(AArch64ISD::DUP, SDLoc(N), NewDUPVT, N.getOperand(0));
6873 return DAG.getNode(ISD::EXTRACT_SUBVECTOR, SDLoc(N.getNode()), NarrowTy,
6874 NewDUP, DAG.getConstant(NumElems, MVT::i64));
6877 static bool isEssentiallyExtractSubvector(SDValue N) {
6878 if (N.getOpcode() == ISD::EXTRACT_SUBVECTOR)
6881 return N.getOpcode() == ISD::BITCAST &&
6882 N.getOperand(0).getOpcode() == ISD::EXTRACT_SUBVECTOR;
6885 /// \brief Helper structure to keep track of ISD::SET_CC operands.
6886 struct GenericSetCCInfo {
6887 const SDValue *Opnd0;
6888 const SDValue *Opnd1;
6892 /// \brief Helper structure to keep track of a SET_CC lowered into AArch64 code.
6893 struct AArch64SetCCInfo {
6895 AArch64CC::CondCode CC;
6898 /// \brief Helper structure to keep track of SetCC information.
6900 GenericSetCCInfo Generic;
6901 AArch64SetCCInfo AArch64;
6904 /// \brief Helper structure to be able to read SetCC information. If set to
6905 /// true, IsAArch64 field, Info is a AArch64SetCCInfo, otherwise Info is a
6906 /// GenericSetCCInfo.
6907 struct SetCCInfoAndKind {
6912 /// \brief Check whether or not \p Op is a SET_CC operation, either a generic or
6914 /// AArch64 lowered one.
6915 /// \p SetCCInfo is filled accordingly.
6916 /// \post SetCCInfo is meanginfull only when this function returns true.
6917 /// \return True when Op is a kind of SET_CC operation.
6918 static bool isSetCC(SDValue Op, SetCCInfoAndKind &SetCCInfo) {
6919 // If this is a setcc, this is straight forward.
6920 if (Op.getOpcode() == ISD::SETCC) {
6921 SetCCInfo.Info.Generic.Opnd0 = &Op.getOperand(0);
6922 SetCCInfo.Info.Generic.Opnd1 = &Op.getOperand(1);
6923 SetCCInfo.Info.Generic.CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
6924 SetCCInfo.IsAArch64 = false;
6927 // Otherwise, check if this is a matching csel instruction.
6931 if (Op.getOpcode() != AArch64ISD::CSEL)
6933 // Set the information about the operands.
6934 // TODO: we want the operands of the Cmp not the csel
6935 SetCCInfo.Info.AArch64.Cmp = &Op.getOperand(3);
6936 SetCCInfo.IsAArch64 = true;
6937 SetCCInfo.Info.AArch64.CC = static_cast<AArch64CC::CondCode>(
6938 cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue());
6940 // Check that the operands matches the constraints:
6941 // (1) Both operands must be constants.
6942 // (2) One must be 1 and the other must be 0.
6943 ConstantSDNode *TValue = dyn_cast<ConstantSDNode>(Op.getOperand(0));
6944 ConstantSDNode *FValue = dyn_cast<ConstantSDNode>(Op.getOperand(1));
6947 if (!TValue || !FValue)
6951 if (!TValue->isOne()) {
6952 // Update the comparison when we are interested in !cc.
6953 std::swap(TValue, FValue);
6954 SetCCInfo.Info.AArch64.CC =
6955 AArch64CC::getInvertedCondCode(SetCCInfo.Info.AArch64.CC);
6957 return TValue->isOne() && FValue->isNullValue();
6960 // Returns true if Op is setcc or zext of setcc.
6961 static bool isSetCCOrZExtSetCC(const SDValue& Op, SetCCInfoAndKind &Info) {
6962 if (isSetCC(Op, Info))
6964 return ((Op.getOpcode() == ISD::ZERO_EXTEND) &&
6965 isSetCC(Op->getOperand(0), Info));
6968 // The folding we want to perform is:
6969 // (add x, [zext] (setcc cc ...) )
6971 // (csel x, (add x, 1), !cc ...)
6973 // The latter will get matched to a CSINC instruction.
6974 static SDValue performSetccAddFolding(SDNode *Op, SelectionDAG &DAG) {
6975 assert(Op && Op->getOpcode() == ISD::ADD && "Unexpected operation!");
6976 SDValue LHS = Op->getOperand(0);
6977 SDValue RHS = Op->getOperand(1);
6978 SetCCInfoAndKind InfoAndKind;
6980 // If neither operand is a SET_CC, give up.
6981 if (!isSetCCOrZExtSetCC(LHS, InfoAndKind)) {
6982 std::swap(LHS, RHS);
6983 if (!isSetCCOrZExtSetCC(LHS, InfoAndKind))
6987 // FIXME: This could be generatized to work for FP comparisons.
6988 EVT CmpVT = InfoAndKind.IsAArch64
6989 ? InfoAndKind.Info.AArch64.Cmp->getOperand(0).getValueType()
6990 : InfoAndKind.Info.Generic.Opnd0->getValueType();
6991 if (CmpVT != MVT::i32 && CmpVT != MVT::i64)
6997 if (InfoAndKind.IsAArch64) {
6998 CCVal = DAG.getConstant(
6999 AArch64CC::getInvertedCondCode(InfoAndKind.Info.AArch64.CC), MVT::i32);
7000 Cmp = *InfoAndKind.Info.AArch64.Cmp;
7002 Cmp = getAArch64Cmp(*InfoAndKind.Info.Generic.Opnd0,
7003 *InfoAndKind.Info.Generic.Opnd1,
7004 ISD::getSetCCInverse(InfoAndKind.Info.Generic.CC, true),
7007 EVT VT = Op->getValueType(0);
7008 LHS = DAG.getNode(ISD::ADD, dl, VT, RHS, DAG.getConstant(1, VT));
7009 return DAG.getNode(AArch64ISD::CSEL, dl, VT, RHS, LHS, CCVal, Cmp);
7012 // The basic add/sub long vector instructions have variants with "2" on the end
7013 // which act on the high-half of their inputs. They are normally matched by
7016 // (add (zeroext (extract_high LHS)),
7017 // (zeroext (extract_high RHS)))
7018 // -> uaddl2 vD, vN, vM
7020 // However, if one of the extracts is something like a duplicate, this
7021 // instruction can still be used profitably. This function puts the DAG into a
7022 // more appropriate form for those patterns to trigger.
7023 static SDValue performAddSubLongCombine(SDNode *N,
7024 TargetLowering::DAGCombinerInfo &DCI,
7025 SelectionDAG &DAG) {
7026 if (DCI.isBeforeLegalizeOps())
7029 MVT VT = N->getSimpleValueType(0);
7030 if (!VT.is128BitVector()) {
7031 if (N->getOpcode() == ISD::ADD)
7032 return performSetccAddFolding(N, DAG);
7036 // Make sure both branches are extended in the same way.
7037 SDValue LHS = N->getOperand(0);
7038 SDValue RHS = N->getOperand(1);
7039 if ((LHS.getOpcode() != ISD::ZERO_EXTEND &&
7040 LHS.getOpcode() != ISD::SIGN_EXTEND) ||
7041 LHS.getOpcode() != RHS.getOpcode())
7044 unsigned ExtType = LHS.getOpcode();
7046 // It's not worth doing if at least one of the inputs isn't already an
7047 // extract, but we don't know which it'll be so we have to try both.
7048 if (isEssentiallyExtractSubvector(LHS.getOperand(0))) {
7049 RHS = tryExtendDUPToExtractHigh(RHS.getOperand(0), DAG);
7053 RHS = DAG.getNode(ExtType, SDLoc(N), VT, RHS);
7054 } else if (isEssentiallyExtractSubvector(RHS.getOperand(0))) {
7055 LHS = tryExtendDUPToExtractHigh(LHS.getOperand(0), DAG);
7059 LHS = DAG.getNode(ExtType, SDLoc(N), VT, LHS);
7062 return DAG.getNode(N->getOpcode(), SDLoc(N), VT, LHS, RHS);
7065 // Massage DAGs which we can use the high-half "long" operations on into
7066 // something isel will recognize better. E.g.
7068 // (aarch64_neon_umull (extract_high vec) (dupv64 scalar)) -->
7069 // (aarch64_neon_umull (extract_high (v2i64 vec)))
7070 // (extract_high (v2i64 (dup128 scalar)))))
7072 static SDValue tryCombineLongOpWithDup(unsigned IID, SDNode *N,
7073 TargetLowering::DAGCombinerInfo &DCI,
7074 SelectionDAG &DAG) {
7075 if (DCI.isBeforeLegalizeOps())
7078 SDValue LHS = N->getOperand(1);
7079 SDValue RHS = N->getOperand(2);
7080 assert(LHS.getValueType().is64BitVector() &&
7081 RHS.getValueType().is64BitVector() &&
7082 "unexpected shape for long operation");
7084 // Either node could be a DUP, but it's not worth doing both of them (you'd
7085 // just as well use the non-high version) so look for a corresponding extract
7086 // operation on the other "wing".
7087 if (isEssentiallyExtractSubvector(LHS)) {
7088 RHS = tryExtendDUPToExtractHigh(RHS, DAG);
7091 } else if (isEssentiallyExtractSubvector(RHS)) {
7092 LHS = tryExtendDUPToExtractHigh(LHS, DAG);
7097 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, SDLoc(N), N->getValueType(0),
7098 N->getOperand(0), LHS, RHS);
7101 static SDValue tryCombineShiftImm(unsigned IID, SDNode *N, SelectionDAG &DAG) {
7102 MVT ElemTy = N->getSimpleValueType(0).getScalarType();
7103 unsigned ElemBits = ElemTy.getSizeInBits();
7105 int64_t ShiftAmount;
7106 if (BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(N->getOperand(2))) {
7107 APInt SplatValue, SplatUndef;
7108 unsigned SplatBitSize;
7110 if (!BVN->isConstantSplat(SplatValue, SplatUndef, SplatBitSize,
7111 HasAnyUndefs, ElemBits) ||
7112 SplatBitSize != ElemBits)
7115 ShiftAmount = SplatValue.getSExtValue();
7116 } else if (ConstantSDNode *CVN = dyn_cast<ConstantSDNode>(N->getOperand(2))) {
7117 ShiftAmount = CVN->getSExtValue();
7125 llvm_unreachable("Unknown shift intrinsic");
7126 case Intrinsic::aarch64_neon_sqshl:
7127 Opcode = AArch64ISD::SQSHL_I;
7128 IsRightShift = false;
7130 case Intrinsic::aarch64_neon_uqshl:
7131 Opcode = AArch64ISD::UQSHL_I;
7132 IsRightShift = false;
7134 case Intrinsic::aarch64_neon_srshl:
7135 Opcode = AArch64ISD::SRSHR_I;
7136 IsRightShift = true;
7138 case Intrinsic::aarch64_neon_urshl:
7139 Opcode = AArch64ISD::URSHR_I;
7140 IsRightShift = true;
7142 case Intrinsic::aarch64_neon_sqshlu:
7143 Opcode = AArch64ISD::SQSHLU_I;
7144 IsRightShift = false;
7148 if (IsRightShift && ShiftAmount <= -1 && ShiftAmount >= -(int)ElemBits)
7149 return DAG.getNode(Opcode, SDLoc(N), N->getValueType(0), N->getOperand(1),
7150 DAG.getConstant(-ShiftAmount, MVT::i32));
7151 else if (!IsRightShift && ShiftAmount >= 0 && ShiftAmount < ElemBits)
7152 return DAG.getNode(Opcode, SDLoc(N), N->getValueType(0), N->getOperand(1),
7153 DAG.getConstant(ShiftAmount, MVT::i32));
7158 // The CRC32[BH] instructions ignore the high bits of their data operand. Since
7159 // the intrinsics must be legal and take an i32, this means there's almost
7160 // certainly going to be a zext in the DAG which we can eliminate.
7161 static SDValue tryCombineCRC32(unsigned Mask, SDNode *N, SelectionDAG &DAG) {
7162 SDValue AndN = N->getOperand(2);
7163 if (AndN.getOpcode() != ISD::AND)
7166 ConstantSDNode *CMask = dyn_cast<ConstantSDNode>(AndN.getOperand(1));
7167 if (!CMask || CMask->getZExtValue() != Mask)
7170 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, SDLoc(N), MVT::i32,
7171 N->getOperand(0), N->getOperand(1), AndN.getOperand(0));
7174 static SDValue performIntrinsicCombine(SDNode *N,
7175 TargetLowering::DAGCombinerInfo &DCI,
7176 const AArch64Subtarget *Subtarget) {
7177 SelectionDAG &DAG = DCI.DAG;
7178 unsigned IID = getIntrinsicID(N);
7182 case Intrinsic::aarch64_neon_vcvtfxs2fp:
7183 case Intrinsic::aarch64_neon_vcvtfxu2fp:
7184 return tryCombineFixedPointConvert(N, DCI, DAG);
7186 case Intrinsic::aarch64_neon_fmax:
7187 return DAG.getNode(AArch64ISD::FMAX, SDLoc(N), N->getValueType(0),
7188 N->getOperand(1), N->getOperand(2));
7189 case Intrinsic::aarch64_neon_fmin:
7190 return DAG.getNode(AArch64ISD::FMIN, SDLoc(N), N->getValueType(0),
7191 N->getOperand(1), N->getOperand(2));
7192 case Intrinsic::aarch64_neon_smull:
7193 case Intrinsic::aarch64_neon_umull:
7194 case Intrinsic::aarch64_neon_pmull:
7195 case Intrinsic::aarch64_neon_sqdmull:
7196 return tryCombineLongOpWithDup(IID, N, DCI, DAG);
7197 case Intrinsic::aarch64_neon_sqshl:
7198 case Intrinsic::aarch64_neon_uqshl:
7199 case Intrinsic::aarch64_neon_sqshlu:
7200 case Intrinsic::aarch64_neon_srshl:
7201 case Intrinsic::aarch64_neon_urshl:
7202 return tryCombineShiftImm(IID, N, DAG);
7203 case Intrinsic::aarch64_crc32b:
7204 case Intrinsic::aarch64_crc32cb:
7205 return tryCombineCRC32(0xff, N, DAG);
7206 case Intrinsic::aarch64_crc32h:
7207 case Intrinsic::aarch64_crc32ch:
7208 return tryCombineCRC32(0xffff, N, DAG);
7213 static SDValue performExtendCombine(SDNode *N,
7214 TargetLowering::DAGCombinerInfo &DCI,
7215 SelectionDAG &DAG) {
7216 // If we see something like (zext (sabd (extract_high ...), (DUP ...))) then
7217 // we can convert that DUP into another extract_high (of a bigger DUP), which
7218 // helps the backend to decide that an sabdl2 would be useful, saving a real
7219 // extract_high operation.
7220 if (!DCI.isBeforeLegalizeOps() && N->getOpcode() == ISD::ZERO_EXTEND &&
7221 N->getOperand(0).getOpcode() == ISD::INTRINSIC_WO_CHAIN) {
7222 SDNode *ABDNode = N->getOperand(0).getNode();
7223 unsigned IID = getIntrinsicID(ABDNode);
7224 if (IID == Intrinsic::aarch64_neon_sabd ||
7225 IID == Intrinsic::aarch64_neon_uabd) {
7226 SDValue NewABD = tryCombineLongOpWithDup(IID, ABDNode, DCI, DAG);
7227 if (!NewABD.getNode())
7230 return DAG.getNode(ISD::ZERO_EXTEND, SDLoc(N), N->getValueType(0),
7235 // This is effectively a custom type legalization for AArch64.
7237 // Type legalization will split an extend of a small, legal, type to a larger
7238 // illegal type by first splitting the destination type, often creating
7239 // illegal source types, which then get legalized in isel-confusing ways,
7240 // leading to really terrible codegen. E.g.,
7241 // %result = v8i32 sext v8i8 %value
7243 // %losrc = extract_subreg %value, ...
7244 // %hisrc = extract_subreg %value, ...
7245 // %lo = v4i32 sext v4i8 %losrc
7246 // %hi = v4i32 sext v4i8 %hisrc
7247 // Things go rapidly downhill from there.
7249 // For AArch64, the [sz]ext vector instructions can only go up one element
7250 // size, so we can, e.g., extend from i8 to i16, but to go from i8 to i32
7251 // take two instructions.
7253 // This implies that the most efficient way to do the extend from v8i8
7254 // to two v4i32 values is to first extend the v8i8 to v8i16, then do
7255 // the normal splitting to happen for the v8i16->v8i32.
7257 // This is pre-legalization to catch some cases where the default
7258 // type legalization will create ill-tempered code.
7259 if (!DCI.isBeforeLegalizeOps())
7262 // We're only interested in cleaning things up for non-legal vector types
7263 // here. If both the source and destination are legal, things will just
7264 // work naturally without any fiddling.
7265 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
7266 EVT ResVT = N->getValueType(0);
7267 if (!ResVT.isVector() || TLI.isTypeLegal(ResVT))
7269 // If the vector type isn't a simple VT, it's beyond the scope of what
7270 // we're worried about here. Let legalization do its thing and hope for
7272 if (!ResVT.isSimple())
7275 SDValue Src = N->getOperand(0);
7276 MVT SrcVT = Src->getValueType(0).getSimpleVT();
7277 // If the source VT is a 64-bit vector, we can play games and get the
7278 // better results we want.
7279 if (SrcVT.getSizeInBits() != 64)
7282 unsigned SrcEltSize = SrcVT.getVectorElementType().getSizeInBits();
7283 unsigned ElementCount = SrcVT.getVectorNumElements();
7284 SrcVT = MVT::getVectorVT(MVT::getIntegerVT(SrcEltSize * 2), ElementCount);
7286 Src = DAG.getNode(N->getOpcode(), DL, SrcVT, Src);
7288 // Now split the rest of the operation into two halves, each with a 64
7292 unsigned NumElements = ResVT.getVectorNumElements();
7293 assert(!(NumElements & 1) && "Splitting vector, but not in half!");
7294 LoVT = HiVT = EVT::getVectorVT(*DAG.getContext(),
7295 ResVT.getVectorElementType(), NumElements / 2);
7297 EVT InNVT = EVT::getVectorVT(*DAG.getContext(), SrcVT.getVectorElementType(),
7298 LoVT.getVectorNumElements());
7299 Lo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, InNVT, Src,
7300 DAG.getIntPtrConstant(0));
7301 Hi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, InNVT, Src,
7302 DAG.getIntPtrConstant(InNVT.getVectorNumElements()));
7303 Lo = DAG.getNode(N->getOpcode(), DL, LoVT, Lo);
7304 Hi = DAG.getNode(N->getOpcode(), DL, HiVT, Hi);
7306 // Now combine the parts back together so we still have a single result
7307 // like the combiner expects.
7308 return DAG.getNode(ISD::CONCAT_VECTORS, DL, ResVT, Lo, Hi);
7311 /// Replace a splat of a scalar to a vector store by scalar stores of the scalar
7312 /// value. The load store optimizer pass will merge them to store pair stores.
7313 /// This has better performance than a splat of the scalar followed by a split
7314 /// vector store. Even if the stores are not merged it is four stores vs a dup,
7315 /// followed by an ext.b and two stores.
7316 static SDValue replaceSplatVectorStore(SelectionDAG &DAG, StoreSDNode *St) {
7317 SDValue StVal = St->getValue();
7318 EVT VT = StVal.getValueType();
7320 // Don't replace floating point stores, they possibly won't be transformed to
7321 // stp because of the store pair suppress pass.
7322 if (VT.isFloatingPoint())
7325 // Check for insert vector elements.
7326 if (StVal.getOpcode() != ISD::INSERT_VECTOR_ELT)
7329 // We can express a splat as store pair(s) for 2 or 4 elements.
7330 unsigned NumVecElts = VT.getVectorNumElements();
7331 if (NumVecElts != 4 && NumVecElts != 2)
7333 SDValue SplatVal = StVal.getOperand(1);
7334 unsigned RemainInsertElts = NumVecElts - 1;
7336 // Check that this is a splat.
7337 while (--RemainInsertElts) {
7338 SDValue NextInsertElt = StVal.getOperand(0);
7339 if (NextInsertElt.getOpcode() != ISD::INSERT_VECTOR_ELT)
7341 if (NextInsertElt.getOperand(1) != SplatVal)
7343 StVal = NextInsertElt;
7345 unsigned OrigAlignment = St->getAlignment();
7346 unsigned EltOffset = NumVecElts == 4 ? 4 : 8;
7347 unsigned Alignment = std::min(OrigAlignment, EltOffset);
7349 // Create scalar stores. This is at least as good as the code sequence for a
7350 // split unaligned store wich is a dup.s, ext.b, and two stores.
7351 // Most of the time the three stores should be replaced by store pair
7352 // instructions (stp).
7354 SDValue BasePtr = St->getBasePtr();
7356 DAG.getStore(St->getChain(), DL, SplatVal, BasePtr, St->getPointerInfo(),
7357 St->isVolatile(), St->isNonTemporal(), St->getAlignment());
7359 unsigned Offset = EltOffset;
7360 while (--NumVecElts) {
7361 SDValue OffsetPtr = DAG.getNode(ISD::ADD, DL, MVT::i64, BasePtr,
7362 DAG.getConstant(Offset, MVT::i64));
7363 NewST1 = DAG.getStore(NewST1.getValue(0), DL, SplatVal, OffsetPtr,
7364 St->getPointerInfo(), St->isVolatile(),
7365 St->isNonTemporal(), Alignment);
7366 Offset += EltOffset;
7371 static SDValue performSTORECombine(SDNode *N,
7372 TargetLowering::DAGCombinerInfo &DCI,
7374 const AArch64Subtarget *Subtarget) {
7375 if (!DCI.isBeforeLegalize())
7378 StoreSDNode *S = cast<StoreSDNode>(N);
7379 if (S->isVolatile())
7382 // Cyclone has bad performance on unaligned 16B stores when crossing line and
7383 // page boundries. We want to split such stores.
7384 if (!Subtarget->isCyclone())
7387 // Don't split at Oz.
7388 MachineFunction &MF = DAG.getMachineFunction();
7389 bool IsMinSize = MF.getFunction()->getAttributes().hasAttribute(
7390 AttributeSet::FunctionIndex, Attribute::MinSize);
7394 SDValue StVal = S->getValue();
7395 EVT VT = StVal.getValueType();
7397 // Don't split v2i64 vectors. Memcpy lowering produces those and splitting
7398 // those up regresses performance on micro-benchmarks and olden/bh.
7399 if (!VT.isVector() || VT.getVectorNumElements() < 2 || VT == MVT::v2i64)
7402 // Split unaligned 16B stores. They are terrible for performance.
7403 // Don't split stores with alignment of 1 or 2. Code that uses clang vector
7404 // extensions can use this to mark that it does not want splitting to happen
7405 // (by underspecifying alignment to be 1 or 2). Furthermore, the chance of
7406 // eliminating alignment hazards is only 1 in 8 for alignment of 2.
7407 if (VT.getSizeInBits() != 128 || S->getAlignment() >= 16 ||
7408 S->getAlignment() <= 2)
7411 // If we get a splat of a scalar convert this vector store to a store of
7412 // scalars. They will be merged into store pairs thereby removing two
7414 SDValue ReplacedSplat = replaceSplatVectorStore(DAG, S);
7415 if (ReplacedSplat != SDValue())
7416 return ReplacedSplat;
7419 unsigned NumElts = VT.getVectorNumElements() / 2;
7420 // Split VT into two.
7422 EVT::getVectorVT(*DAG.getContext(), VT.getVectorElementType(), NumElts);
7423 SDValue SubVector0 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, HalfVT, StVal,
7424 DAG.getIntPtrConstant(0));
7425 SDValue SubVector1 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, HalfVT, StVal,
7426 DAG.getIntPtrConstant(NumElts));
7427 SDValue BasePtr = S->getBasePtr();
7429 DAG.getStore(S->getChain(), DL, SubVector0, BasePtr, S->getPointerInfo(),
7430 S->isVolatile(), S->isNonTemporal(), S->getAlignment());
7431 SDValue OffsetPtr = DAG.getNode(ISD::ADD, DL, MVT::i64, BasePtr,
7432 DAG.getConstant(8, MVT::i64));
7433 return DAG.getStore(NewST1.getValue(0), DL, SubVector1, OffsetPtr,
7434 S->getPointerInfo(), S->isVolatile(), S->isNonTemporal(),
7438 /// Target-specific DAG combine function for post-increment LD1 (lane) and
7439 /// post-increment LD1R.
7440 static SDValue performPostLD1Combine(SDNode *N,
7441 TargetLowering::DAGCombinerInfo &DCI,
7443 if (DCI.isBeforeLegalizeOps())
7446 SelectionDAG &DAG = DCI.DAG;
7447 EVT VT = N->getValueType(0);
7449 unsigned LoadIdx = IsLaneOp ? 1 : 0;
7450 SDNode *LD = N->getOperand(LoadIdx).getNode();
7451 // If it is not LOAD, can not do such combine.
7452 if (LD->getOpcode() != ISD::LOAD)
7455 LoadSDNode *LoadSDN = cast<LoadSDNode>(LD);
7456 EVT MemVT = LoadSDN->getMemoryVT();
7457 // Check if memory operand is the same type as the vector element.
7458 if (MemVT != VT.getVectorElementType())
7461 // Check if there are other uses. If so, do not combine as it will introduce
7463 for (SDNode::use_iterator UI = LD->use_begin(), UE = LD->use_end(); UI != UE;
7465 if (UI.getUse().getResNo() == 1) // Ignore uses of the chain result.
7471 SDValue Addr = LD->getOperand(1);
7472 SDValue Vector = N->getOperand(0);
7473 // Search for a use of the address operand that is an increment.
7474 for (SDNode::use_iterator UI = Addr.getNode()->use_begin(), UE =
7475 Addr.getNode()->use_end(); UI != UE; ++UI) {
7477 if (User->getOpcode() != ISD::ADD
7478 || UI.getUse().getResNo() != Addr.getResNo())
7481 // Check that the add is independent of the load. Otherwise, folding it
7482 // would create a cycle.
7483 if (User->isPredecessorOf(LD) || LD->isPredecessorOf(User))
7485 // Also check that add is not used in the vector operand. This would also
7487 if (User->isPredecessorOf(Vector.getNode()))
7490 // If the increment is a constant, it must match the memory ref size.
7491 SDValue Inc = User->getOperand(User->getOperand(0) == Addr ? 1 : 0);
7492 if (ConstantSDNode *CInc = dyn_cast<ConstantSDNode>(Inc.getNode())) {
7493 uint32_t IncVal = CInc->getZExtValue();
7494 unsigned NumBytes = VT.getScalarSizeInBits() / 8;
7495 if (IncVal != NumBytes)
7497 Inc = DAG.getRegister(AArch64::XZR, MVT::i64);
7500 SmallVector<SDValue, 8> Ops;
7501 Ops.push_back(LD->getOperand(0)); // Chain
7503 Ops.push_back(Vector); // The vector to be inserted
7504 Ops.push_back(N->getOperand(2)); // The lane to be inserted in the vector
7506 Ops.push_back(Addr);
7509 EVT Tys[3] = { VT, MVT::i64, MVT::Other };
7510 SDVTList SDTys = DAG.getVTList(ArrayRef<EVT>(Tys, 3));
7511 unsigned NewOp = IsLaneOp ? AArch64ISD::LD1LANEpost : AArch64ISD::LD1DUPpost;
7512 SDValue UpdN = DAG.getMemIntrinsicNode(NewOp, SDLoc(N), SDTys, Ops,
7514 LoadSDN->getMemOperand());
7517 std::vector<SDValue> NewResults;
7518 NewResults.push_back(SDValue(LD, 0)); // The result of load
7519 NewResults.push_back(SDValue(UpdN.getNode(), 2)); // Chain
7520 DCI.CombineTo(LD, NewResults);
7521 DCI.CombineTo(N, SDValue(UpdN.getNode(), 0)); // Dup/Inserted Result
7522 DCI.CombineTo(User, SDValue(UpdN.getNode(), 1)); // Write back register
7529 /// Target-specific DAG combine function for NEON load/store intrinsics
7530 /// to merge base address updates.
7531 static SDValue performNEONPostLDSTCombine(SDNode *N,
7532 TargetLowering::DAGCombinerInfo &DCI,
7533 SelectionDAG &DAG) {
7534 if (DCI.isBeforeLegalize() || DCI.isCalledByLegalizer())
7537 unsigned AddrOpIdx = N->getNumOperands() - 1;
7538 SDValue Addr = N->getOperand(AddrOpIdx);
7540 // Search for a use of the address operand that is an increment.
7541 for (SDNode::use_iterator UI = Addr.getNode()->use_begin(),
7542 UE = Addr.getNode()->use_end(); UI != UE; ++UI) {
7544 if (User->getOpcode() != ISD::ADD ||
7545 UI.getUse().getResNo() != Addr.getResNo())
7548 // Check that the add is independent of the load/store. Otherwise, folding
7549 // it would create a cycle.
7550 if (User->isPredecessorOf(N) || N->isPredecessorOf(User))
7553 // Find the new opcode for the updating load/store.
7554 bool IsStore = false;
7555 bool IsLaneOp = false;
7556 bool IsDupOp = false;
7557 unsigned NewOpc = 0;
7558 unsigned NumVecs = 0;
7559 unsigned IntNo = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue();
7561 default: llvm_unreachable("unexpected intrinsic for Neon base update");
7562 case Intrinsic::aarch64_neon_ld2: NewOpc = AArch64ISD::LD2post;
7564 case Intrinsic::aarch64_neon_ld3: NewOpc = AArch64ISD::LD3post;
7566 case Intrinsic::aarch64_neon_ld4: NewOpc = AArch64ISD::LD4post;
7568 case Intrinsic::aarch64_neon_st2: NewOpc = AArch64ISD::ST2post;
7569 NumVecs = 2; IsStore = true; break;
7570 case Intrinsic::aarch64_neon_st3: NewOpc = AArch64ISD::ST3post;
7571 NumVecs = 3; IsStore = true; break;
7572 case Intrinsic::aarch64_neon_st4: NewOpc = AArch64ISD::ST4post;
7573 NumVecs = 4; IsStore = true; break;
7574 case Intrinsic::aarch64_neon_ld1x2: NewOpc = AArch64ISD::LD1x2post;
7576 case Intrinsic::aarch64_neon_ld1x3: NewOpc = AArch64ISD::LD1x3post;
7578 case Intrinsic::aarch64_neon_ld1x4: NewOpc = AArch64ISD::LD1x4post;
7580 case Intrinsic::aarch64_neon_st1x2: NewOpc = AArch64ISD::ST1x2post;
7581 NumVecs = 2; IsStore = true; break;
7582 case Intrinsic::aarch64_neon_st1x3: NewOpc = AArch64ISD::ST1x3post;
7583 NumVecs = 3; IsStore = true; break;
7584 case Intrinsic::aarch64_neon_st1x4: NewOpc = AArch64ISD::ST1x4post;
7585 NumVecs = 4; IsStore = true; break;
7586 case Intrinsic::aarch64_neon_ld2r: NewOpc = AArch64ISD::LD2DUPpost;
7587 NumVecs = 2; IsDupOp = true; break;
7588 case Intrinsic::aarch64_neon_ld3r: NewOpc = AArch64ISD::LD3DUPpost;
7589 NumVecs = 3; IsDupOp = true; break;
7590 case Intrinsic::aarch64_neon_ld4r: NewOpc = AArch64ISD::LD4DUPpost;
7591 NumVecs = 4; IsDupOp = true; break;
7592 case Intrinsic::aarch64_neon_ld2lane: NewOpc = AArch64ISD::LD2LANEpost;
7593 NumVecs = 2; IsLaneOp = true; break;
7594 case Intrinsic::aarch64_neon_ld3lane: NewOpc = AArch64ISD::LD3LANEpost;
7595 NumVecs = 3; IsLaneOp = true; break;
7596 case Intrinsic::aarch64_neon_ld4lane: NewOpc = AArch64ISD::LD4LANEpost;
7597 NumVecs = 4; IsLaneOp = true; break;
7598 case Intrinsic::aarch64_neon_st2lane: NewOpc = AArch64ISD::ST2LANEpost;
7599 NumVecs = 2; IsStore = true; IsLaneOp = true; break;
7600 case Intrinsic::aarch64_neon_st3lane: NewOpc = AArch64ISD::ST3LANEpost;
7601 NumVecs = 3; IsStore = true; IsLaneOp = true; break;
7602 case Intrinsic::aarch64_neon_st4lane: NewOpc = AArch64ISD::ST4LANEpost;
7603 NumVecs = 4; IsStore = true; IsLaneOp = true; break;
7608 VecTy = N->getOperand(2).getValueType();
7610 VecTy = N->getValueType(0);
7612 // If the increment is a constant, it must match the memory ref size.
7613 SDValue Inc = User->getOperand(User->getOperand(0) == Addr ? 1 : 0);
7614 if (ConstantSDNode *CInc = dyn_cast<ConstantSDNode>(Inc.getNode())) {
7615 uint32_t IncVal = CInc->getZExtValue();
7616 unsigned NumBytes = NumVecs * VecTy.getSizeInBits() / 8;
7617 if (IsLaneOp || IsDupOp)
7618 NumBytes /= VecTy.getVectorNumElements();
7619 if (IncVal != NumBytes)
7621 Inc = DAG.getRegister(AArch64::XZR, MVT::i64);
7623 SmallVector<SDValue, 8> Ops;
7624 Ops.push_back(N->getOperand(0)); // Incoming chain
7625 // Load lane and store have vector list as input.
7626 if (IsLaneOp || IsStore)
7627 for (unsigned i = 2; i < AddrOpIdx; ++i)
7628 Ops.push_back(N->getOperand(i));
7629 Ops.push_back(Addr); // Base register
7634 unsigned NumResultVecs = (IsStore ? 0 : NumVecs);
7636 for (n = 0; n < NumResultVecs; ++n)
7638 Tys[n++] = MVT::i64; // Type of write back register
7639 Tys[n] = MVT::Other; // Type of the chain
7640 SDVTList SDTys = DAG.getVTList(ArrayRef<EVT>(Tys, NumResultVecs + 2));
7642 MemIntrinsicSDNode *MemInt = cast<MemIntrinsicSDNode>(N);
7643 SDValue UpdN = DAG.getMemIntrinsicNode(NewOpc, SDLoc(N), SDTys, Ops,
7644 MemInt->getMemoryVT(),
7645 MemInt->getMemOperand());
7648 std::vector<SDValue> NewResults;
7649 for (unsigned i = 0; i < NumResultVecs; ++i) {
7650 NewResults.push_back(SDValue(UpdN.getNode(), i));
7652 NewResults.push_back(SDValue(UpdN.getNode(), NumResultVecs + 1));
7653 DCI.CombineTo(N, NewResults);
7654 DCI.CombineTo(User, SDValue(UpdN.getNode(), NumResultVecs));
7661 // Optimize compare with zero and branch.
7662 static SDValue performBRCONDCombine(SDNode *N,
7663 TargetLowering::DAGCombinerInfo &DCI,
7664 SelectionDAG &DAG) {
7665 SDValue Chain = N->getOperand(0);
7666 SDValue Dest = N->getOperand(1);
7667 SDValue CCVal = N->getOperand(2);
7668 SDValue Cmp = N->getOperand(3);
7670 assert(isa<ConstantSDNode>(CCVal) && "Expected a ConstantSDNode here!");
7671 unsigned CC = cast<ConstantSDNode>(CCVal)->getZExtValue();
7672 if (CC != AArch64CC::EQ && CC != AArch64CC::NE)
7675 unsigned CmpOpc = Cmp.getOpcode();
7676 if (CmpOpc != AArch64ISD::ADDS && CmpOpc != AArch64ISD::SUBS)
7679 // Only attempt folding if there is only one use of the flag and no use of the
7681 if (!Cmp->hasNUsesOfValue(0, 0) || !Cmp->hasNUsesOfValue(1, 1))
7684 SDValue LHS = Cmp.getOperand(0);
7685 SDValue RHS = Cmp.getOperand(1);
7687 assert(LHS.getValueType() == RHS.getValueType() &&
7688 "Expected the value type to be the same for both operands!");
7689 if (LHS.getValueType() != MVT::i32 && LHS.getValueType() != MVT::i64)
7692 if (isa<ConstantSDNode>(LHS) && cast<ConstantSDNode>(LHS)->isNullValue())
7693 std::swap(LHS, RHS);
7695 if (!isa<ConstantSDNode>(RHS) || !cast<ConstantSDNode>(RHS)->isNullValue())
7698 if (LHS.getOpcode() == ISD::SHL || LHS.getOpcode() == ISD::SRA ||
7699 LHS.getOpcode() == ISD::SRL)
7702 // Fold the compare into the branch instruction.
7704 if (CC == AArch64CC::EQ)
7705 BR = DAG.getNode(AArch64ISD::CBZ, SDLoc(N), MVT::Other, Chain, LHS, Dest);
7707 BR = DAG.getNode(AArch64ISD::CBNZ, SDLoc(N), MVT::Other, Chain, LHS, Dest);
7709 // Do not add new nodes to DAG combiner worklist.
7710 DCI.CombineTo(N, BR, false);
7715 // vselect (v1i1 setcc) ->
7716 // vselect (v1iXX setcc) (XX is the size of the compared operand type)
7717 // FIXME: Currently the type legalizer can't handle VSELECT having v1i1 as
7718 // condition. If it can legalize "VSELECT v1i1" correctly, no need to combine
7720 static SDValue performVSelectCombine(SDNode *N, SelectionDAG &DAG) {
7721 SDValue N0 = N->getOperand(0);
7722 EVT CCVT = N0.getValueType();
7724 if (N0.getOpcode() != ISD::SETCC || CCVT.getVectorNumElements() != 1 ||
7725 CCVT.getVectorElementType() != MVT::i1)
7728 EVT ResVT = N->getValueType(0);
7729 EVT CmpVT = N0.getOperand(0).getValueType();
7730 // Only combine when the result type is of the same size as the compared
7732 if (ResVT.getSizeInBits() != CmpVT.getSizeInBits())
7735 SDValue IfTrue = N->getOperand(1);
7736 SDValue IfFalse = N->getOperand(2);
7738 DAG.getSetCC(SDLoc(N), CmpVT.changeVectorElementTypeToInteger(),
7739 N0.getOperand(0), N0.getOperand(1),
7740 cast<CondCodeSDNode>(N0.getOperand(2))->get());
7741 return DAG.getNode(ISD::VSELECT, SDLoc(N), ResVT, SetCC,
7745 /// A vector select: "(select vL, vR, (setcc LHS, RHS))" is best performed with
7746 /// the compare-mask instructions rather than going via NZCV, even if LHS and
7747 /// RHS are really scalar. This replaces any scalar setcc in the above pattern
7748 /// with a vector one followed by a DUP shuffle on the result.
7749 static SDValue performSelectCombine(SDNode *N, SelectionDAG &DAG) {
7750 SDValue N0 = N->getOperand(0);
7751 EVT ResVT = N->getValueType(0);
7753 if (!N->getOperand(1).getValueType().isVector())
7756 if (N0.getOpcode() != ISD::SETCC || N0.getValueType() != MVT::i1)
7761 EVT SrcVT = N0.getOperand(0).getValueType();
7762 SrcVT = EVT::getVectorVT(*DAG.getContext(), SrcVT,
7763 ResVT.getSizeInBits() / SrcVT.getSizeInBits());
7764 EVT CCVT = SrcVT.changeVectorElementTypeToInteger();
7766 // First perform a vector comparison, where lane 0 is the one we're interested
7769 DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, SrcVT, N0.getOperand(0));
7771 DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, SrcVT, N0.getOperand(1));
7772 SDValue SetCC = DAG.getNode(ISD::SETCC, DL, CCVT, LHS, RHS, N0.getOperand(2));
7774 // Now duplicate the comparison mask we want across all other lanes.
7775 SmallVector<int, 8> DUPMask(CCVT.getVectorNumElements(), 0);
7776 SDValue Mask = DAG.getVectorShuffle(CCVT, DL, SetCC, SetCC, DUPMask.data());
7777 Mask = DAG.getNode(ISD::BITCAST, DL, ResVT.changeVectorElementTypeToInteger(),
7780 return DAG.getSelect(DL, ResVT, Mask, N->getOperand(1), N->getOperand(2));
7783 SDValue AArch64TargetLowering::PerformDAGCombine(SDNode *N,
7784 DAGCombinerInfo &DCI) const {
7785 SelectionDAG &DAG = DCI.DAG;
7786 switch (N->getOpcode()) {
7791 return performAddSubLongCombine(N, DCI, DAG);
7793 return performXorCombine(N, DAG, DCI, Subtarget);
7795 return performMulCombine(N, DAG, DCI, Subtarget);
7796 case ISD::SINT_TO_FP:
7797 case ISD::UINT_TO_FP:
7798 return performIntToFpCombine(N, DAG);
7800 return performORCombine(N, DCI, Subtarget);
7801 case ISD::INTRINSIC_WO_CHAIN:
7802 return performIntrinsicCombine(N, DCI, Subtarget);
7803 case ISD::ANY_EXTEND:
7804 case ISD::ZERO_EXTEND:
7805 case ISD::SIGN_EXTEND:
7806 return performExtendCombine(N, DCI, DAG);
7808 return performBitcastCombine(N, DCI, DAG);
7809 case ISD::CONCAT_VECTORS:
7810 return performConcatVectorsCombine(N, DCI, DAG);
7812 return performSelectCombine(N, DAG);
7814 return performVSelectCombine(N, DCI.DAG);
7816 return performSTORECombine(N, DCI, DAG, Subtarget);
7817 case AArch64ISD::BRCOND:
7818 return performBRCONDCombine(N, DCI, DAG);
7819 case AArch64ISD::DUP:
7820 return performPostLD1Combine(N, DCI, false);
7821 case ISD::INSERT_VECTOR_ELT:
7822 return performPostLD1Combine(N, DCI, true);
7823 case ISD::INTRINSIC_VOID:
7824 case ISD::INTRINSIC_W_CHAIN:
7825 switch (cast<ConstantSDNode>(N->getOperand(1))->getZExtValue()) {
7826 case Intrinsic::aarch64_neon_ld2:
7827 case Intrinsic::aarch64_neon_ld3:
7828 case Intrinsic::aarch64_neon_ld4:
7829 case Intrinsic::aarch64_neon_ld1x2:
7830 case Intrinsic::aarch64_neon_ld1x3:
7831 case Intrinsic::aarch64_neon_ld1x4:
7832 case Intrinsic::aarch64_neon_ld2lane:
7833 case Intrinsic::aarch64_neon_ld3lane:
7834 case Intrinsic::aarch64_neon_ld4lane:
7835 case Intrinsic::aarch64_neon_ld2r:
7836 case Intrinsic::aarch64_neon_ld3r:
7837 case Intrinsic::aarch64_neon_ld4r:
7838 case Intrinsic::aarch64_neon_st2:
7839 case Intrinsic::aarch64_neon_st3:
7840 case Intrinsic::aarch64_neon_st4:
7841 case Intrinsic::aarch64_neon_st1x2:
7842 case Intrinsic::aarch64_neon_st1x3:
7843 case Intrinsic::aarch64_neon_st1x4:
7844 case Intrinsic::aarch64_neon_st2lane:
7845 case Intrinsic::aarch64_neon_st3lane:
7846 case Intrinsic::aarch64_neon_st4lane:
7847 return performNEONPostLDSTCombine(N, DCI, DAG);
7855 // Check if the return value is used as only a return value, as otherwise
7856 // we can't perform a tail-call. In particular, we need to check for
7857 // target ISD nodes that are returns and any other "odd" constructs
7858 // that the generic analysis code won't necessarily catch.
7859 bool AArch64TargetLowering::isUsedByReturnOnly(SDNode *N,
7860 SDValue &Chain) const {
7861 if (N->getNumValues() != 1)
7863 if (!N->hasNUsesOfValue(1, 0))
7866 SDValue TCChain = Chain;
7867 SDNode *Copy = *N->use_begin();
7868 if (Copy->getOpcode() == ISD::CopyToReg) {
7869 // If the copy has a glue operand, we conservatively assume it isn't safe to
7870 // perform a tail call.
7871 if (Copy->getOperand(Copy->getNumOperands() - 1).getValueType() ==
7874 TCChain = Copy->getOperand(0);
7875 } else if (Copy->getOpcode() != ISD::FP_EXTEND)
7878 bool HasRet = false;
7879 for (SDNode *Node : Copy->uses()) {
7880 if (Node->getOpcode() != AArch64ISD::RET_FLAG)
7892 // Return whether the an instruction can potentially be optimized to a tail
7893 // call. This will cause the optimizers to attempt to move, or duplicate,
7894 // return instructions to help enable tail call optimizations for this
7896 bool AArch64TargetLowering::mayBeEmittedAsTailCall(CallInst *CI) const {
7897 if (!CI->isTailCall())
7903 bool AArch64TargetLowering::getIndexedAddressParts(SDNode *Op, SDValue &Base,
7905 ISD::MemIndexedMode &AM,
7907 SelectionDAG &DAG) const {
7908 if (Op->getOpcode() != ISD::ADD && Op->getOpcode() != ISD::SUB)
7911 Base = Op->getOperand(0);
7912 // All of the indexed addressing mode instructions take a signed
7913 // 9 bit immediate offset.
7914 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Op->getOperand(1))) {
7915 int64_t RHSC = (int64_t)RHS->getZExtValue();
7916 if (RHSC >= 256 || RHSC <= -256)
7918 IsInc = (Op->getOpcode() == ISD::ADD);
7919 Offset = Op->getOperand(1);
7925 bool AArch64TargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base,
7927 ISD::MemIndexedMode &AM,
7928 SelectionDAG &DAG) const {
7931 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
7932 VT = LD->getMemoryVT();
7933 Ptr = LD->getBasePtr();
7934 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
7935 VT = ST->getMemoryVT();
7936 Ptr = ST->getBasePtr();
7941 if (!getIndexedAddressParts(Ptr.getNode(), Base, Offset, AM, IsInc, DAG))
7943 AM = IsInc ? ISD::PRE_INC : ISD::PRE_DEC;
7947 bool AArch64TargetLowering::getPostIndexedAddressParts(
7948 SDNode *N, SDNode *Op, SDValue &Base, SDValue &Offset,
7949 ISD::MemIndexedMode &AM, SelectionDAG &DAG) const {
7952 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
7953 VT = LD->getMemoryVT();
7954 Ptr = LD->getBasePtr();
7955 } else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
7956 VT = ST->getMemoryVT();
7957 Ptr = ST->getBasePtr();
7962 if (!getIndexedAddressParts(Op, Base, Offset, AM, IsInc, DAG))
7964 // Post-indexing updates the base, so it's not a valid transform
7965 // if that's not the same as the load's pointer.
7968 AM = IsInc ? ISD::POST_INC : ISD::POST_DEC;
7972 static void ReplaceBITCASTResults(SDNode *N, SmallVectorImpl<SDValue> &Results,
7973 SelectionDAG &DAG) {
7974 if (N->getValueType(0) != MVT::i16)
7978 SDValue Op = N->getOperand(0);
7979 assert(Op.getValueType() == MVT::f16 &&
7980 "Inconsistent bitcast? Only 16-bit types should be i16 or f16");
7982 DAG.getMachineNode(TargetOpcode::INSERT_SUBREG, DL, MVT::f32,
7983 DAG.getUNDEF(MVT::i32), Op,
7984 DAG.getTargetConstant(AArch64::hsub, MVT::i32)),
7986 Op = DAG.getNode(ISD::BITCAST, DL, MVT::i32, Op);
7987 Results.push_back(DAG.getNode(ISD::TRUNCATE, DL, MVT::i16, Op));
7990 void AArch64TargetLowering::ReplaceNodeResults(
7991 SDNode *N, SmallVectorImpl<SDValue> &Results, SelectionDAG &DAG) const {
7992 switch (N->getOpcode()) {
7994 llvm_unreachable("Don't know how to custom expand this");
7996 ReplaceBITCASTResults(N, Results, DAG);
7998 case ISD::FP_TO_UINT:
7999 case ISD::FP_TO_SINT:
8000 assert(N->getValueType(0) == MVT::i128 && "unexpected illegal conversion");
8001 // Let normal code take care of it by not adding anything to Results.
8006 bool AArch64TargetLowering::shouldExpandAtomicInIR(Instruction *Inst) const {
8007 // Loads and stores less than 128-bits are already atomic; ones above that
8008 // are doomed anyway, so defer to the default libcall and blame the OS when
8010 if (StoreInst *SI = dyn_cast<StoreInst>(Inst))
8011 return SI->getValueOperand()->getType()->getPrimitiveSizeInBits() == 128;
8012 else if (LoadInst *LI = dyn_cast<LoadInst>(Inst))
8013 return LI->getType()->getPrimitiveSizeInBits() == 128;
8015 // For the real atomic operations, we have ldxr/stxr up to 128 bits.
8016 return Inst->getType()->getPrimitiveSizeInBits() <= 128;
8019 TargetLoweringBase::LegalizeTypeAction
8020 AArch64TargetLowering::getPreferredVectorAction(EVT VT) const {
8021 MVT SVT = VT.getSimpleVT();
8022 // During type legalization, we prefer to widen v1i8, v1i16, v1i32 to v8i8,
8023 // v4i16, v2i32 instead of to promote.
8024 if (SVT == MVT::v1i8 || SVT == MVT::v1i16 || SVT == MVT::v1i32
8025 || SVT == MVT::v1f32)
8026 return TypeWidenVector;
8028 return TargetLoweringBase::getPreferredVectorAction(VT);
8031 Value *AArch64TargetLowering::emitLoadLinked(IRBuilder<> &Builder, Value *Addr,
8032 AtomicOrdering Ord) const {
8033 Module *M = Builder.GetInsertBlock()->getParent()->getParent();
8034 Type *ValTy = cast<PointerType>(Addr->getType())->getElementType();
8036 Ord == Acquire || Ord == AcquireRelease || Ord == SequentiallyConsistent;
8038 // Since i128 isn't legal and intrinsics don't get type-lowered, the ldrexd
8039 // intrinsic must return {i64, i64} and we have to recombine them into a
8040 // single i128 here.
8041 if (ValTy->getPrimitiveSizeInBits() == 128) {
8043 IsAcquire ? Intrinsic::aarch64_ldaxp : Intrinsic::aarch64_ldxp;
8044 Function *Ldxr = llvm::Intrinsic::getDeclaration(M, Int);
8046 Addr = Builder.CreateBitCast(Addr, Type::getInt8PtrTy(M->getContext()));
8047 Value *LoHi = Builder.CreateCall(Ldxr, Addr, "lohi");
8049 Value *Lo = Builder.CreateExtractValue(LoHi, 0, "lo");
8050 Value *Hi = Builder.CreateExtractValue(LoHi, 1, "hi");
8051 Lo = Builder.CreateZExt(Lo, ValTy, "lo64");
8052 Hi = Builder.CreateZExt(Hi, ValTy, "hi64");
8053 return Builder.CreateOr(
8054 Lo, Builder.CreateShl(Hi, ConstantInt::get(ValTy, 64)), "val64");
8057 Type *Tys[] = { Addr->getType() };
8059 IsAcquire ? Intrinsic::aarch64_ldaxr : Intrinsic::aarch64_ldxr;
8060 Function *Ldxr = llvm::Intrinsic::getDeclaration(M, Int, Tys);
8062 return Builder.CreateTruncOrBitCast(
8063 Builder.CreateCall(Ldxr, Addr),
8064 cast<PointerType>(Addr->getType())->getElementType());
8067 Value *AArch64TargetLowering::emitStoreConditional(IRBuilder<> &Builder,
8068 Value *Val, Value *Addr,
8069 AtomicOrdering Ord) const {
8070 Module *M = Builder.GetInsertBlock()->getParent()->getParent();
8072 Ord == Release || Ord == AcquireRelease || Ord == SequentiallyConsistent;
8074 // Since the intrinsics must have legal type, the i128 intrinsics take two
8075 // parameters: "i64, i64". We must marshal Val into the appropriate form
8077 if (Val->getType()->getPrimitiveSizeInBits() == 128) {
8079 IsRelease ? Intrinsic::aarch64_stlxp : Intrinsic::aarch64_stxp;
8080 Function *Stxr = Intrinsic::getDeclaration(M, Int);
8081 Type *Int64Ty = Type::getInt64Ty(M->getContext());
8083 Value *Lo = Builder.CreateTrunc(Val, Int64Ty, "lo");
8084 Value *Hi = Builder.CreateTrunc(Builder.CreateLShr(Val, 64), Int64Ty, "hi");
8085 Addr = Builder.CreateBitCast(Addr, Type::getInt8PtrTy(M->getContext()));
8086 return Builder.CreateCall3(Stxr, Lo, Hi, Addr);
8090 IsRelease ? Intrinsic::aarch64_stlxr : Intrinsic::aarch64_stxr;
8091 Type *Tys[] = { Addr->getType() };
8092 Function *Stxr = Intrinsic::getDeclaration(M, Int, Tys);
8094 return Builder.CreateCall2(
8095 Stxr, Builder.CreateZExtOrBitCast(
8096 Val, Stxr->getFunctionType()->getParamType(0)),