1 //===-- MSP430ISelLowering.cpp - MSP430 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 MSP430TargetLowering class.
12 //===----------------------------------------------------------------------===//
14 #include "MSP430ISelLowering.h"
16 #include "MSP430MachineFunctionInfo.h"
17 #include "MSP430Subtarget.h"
18 #include "MSP430TargetMachine.h"
19 #include "llvm/CodeGen/CallingConvLower.h"
20 #include "llvm/CodeGen/MachineFrameInfo.h"
21 #include "llvm/CodeGen/MachineFunction.h"
22 #include "llvm/CodeGen/MachineInstrBuilder.h"
23 #include "llvm/CodeGen/MachineRegisterInfo.h"
24 #include "llvm/CodeGen/SelectionDAGISel.h"
25 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
26 #include "llvm/CodeGen/ValueTypes.h"
27 #include "llvm/IR/CallingConv.h"
28 #include "llvm/IR/DerivedTypes.h"
29 #include "llvm/IR/Function.h"
30 #include "llvm/IR/GlobalAlias.h"
31 #include "llvm/IR/GlobalVariable.h"
32 #include "llvm/IR/Intrinsics.h"
33 #include "llvm/Support/CommandLine.h"
34 #include "llvm/Support/Debug.h"
35 #include "llvm/Support/ErrorHandling.h"
36 #include "llvm/Support/raw_ostream.h"
39 #define DEBUG_TYPE "msp430-lower"
41 MSP430TargetLowering::MSP430TargetLowering(const TargetMachine &TM,
42 const MSP430Subtarget &STI)
43 : TargetLowering(TM) {
45 // Set up the register classes.
46 addRegisterClass(MVT::i8, &MSP430::GR8RegClass);
47 addRegisterClass(MVT::i16, &MSP430::GR16RegClass);
49 // Compute derived properties from the register classes
50 computeRegisterProperties(STI.getRegisterInfo());
52 // Provide all sorts of operation actions
53 setStackPointerRegisterToSaveRestore(MSP430::SP);
54 setBooleanContents(ZeroOrOneBooleanContent);
55 setBooleanVectorContents(ZeroOrOneBooleanContent); // FIXME: Is this correct?
57 // We have post-incremented loads / stores.
58 setIndexedLoadAction(ISD::POST_INC, MVT::i8, Legal);
59 setIndexedLoadAction(ISD::POST_INC, MVT::i16, Legal);
61 for (MVT VT : MVT::integer_valuetypes()) {
62 setLoadExtAction(ISD::EXTLOAD, VT, MVT::i1, Promote);
63 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i1, Promote);
64 setLoadExtAction(ISD::ZEXTLOAD, VT, MVT::i1, Promote);
65 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i8, Expand);
66 setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i16, Expand);
69 // We don't have any truncstores
70 setTruncStoreAction(MVT::i16, MVT::i8, Expand);
72 setOperationAction(ISD::SRA, MVT::i8, Custom);
73 setOperationAction(ISD::SHL, MVT::i8, Custom);
74 setOperationAction(ISD::SRL, MVT::i8, Custom);
75 setOperationAction(ISD::SRA, MVT::i16, Custom);
76 setOperationAction(ISD::SHL, MVT::i16, Custom);
77 setOperationAction(ISD::SRL, MVT::i16, Custom);
78 setOperationAction(ISD::ROTL, MVT::i8, Expand);
79 setOperationAction(ISD::ROTR, MVT::i8, Expand);
80 setOperationAction(ISD::ROTL, MVT::i16, Expand);
81 setOperationAction(ISD::ROTR, MVT::i16, Expand);
82 setOperationAction(ISD::GlobalAddress, MVT::i16, Custom);
83 setOperationAction(ISD::ExternalSymbol, MVT::i16, Custom);
84 setOperationAction(ISD::BlockAddress, MVT::i16, Custom);
85 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
86 setOperationAction(ISD::BR_CC, MVT::i8, Custom);
87 setOperationAction(ISD::BR_CC, MVT::i16, Custom);
88 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
89 setOperationAction(ISD::SETCC, MVT::i8, Custom);
90 setOperationAction(ISD::SETCC, MVT::i16, Custom);
91 setOperationAction(ISD::SELECT, MVT::i8, Expand);
92 setOperationAction(ISD::SELECT, MVT::i16, Expand);
93 setOperationAction(ISD::SELECT_CC, MVT::i8, Custom);
94 setOperationAction(ISD::SELECT_CC, MVT::i16, Custom);
95 setOperationAction(ISD::SIGN_EXTEND, MVT::i16, Custom);
96 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i8, Expand);
97 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i16, Expand);
98 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
99 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
101 setOperationAction(ISD::CTTZ, MVT::i8, Expand);
102 setOperationAction(ISD::CTTZ, MVT::i16, Expand);
103 setOperationAction(ISD::CTLZ, MVT::i8, Expand);
104 setOperationAction(ISD::CTLZ, MVT::i16, Expand);
105 setOperationAction(ISD::CTPOP, MVT::i8, Expand);
106 setOperationAction(ISD::CTPOP, MVT::i16, Expand);
108 setOperationAction(ISD::SHL_PARTS, MVT::i8, Expand);
109 setOperationAction(ISD::SHL_PARTS, MVT::i16, Expand);
110 setOperationAction(ISD::SRL_PARTS, MVT::i8, Expand);
111 setOperationAction(ISD::SRL_PARTS, MVT::i16, Expand);
112 setOperationAction(ISD::SRA_PARTS, MVT::i8, Expand);
113 setOperationAction(ISD::SRA_PARTS, MVT::i16, Expand);
115 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
117 // FIXME: Implement efficiently multiplication by a constant
118 setOperationAction(ISD::MUL, MVT::i8, Promote);
119 setOperationAction(ISD::MULHS, MVT::i8, Promote);
120 setOperationAction(ISD::MULHU, MVT::i8, Promote);
121 setOperationAction(ISD::SMUL_LOHI, MVT::i8, Promote);
122 setOperationAction(ISD::UMUL_LOHI, MVT::i8, Promote);
123 setOperationAction(ISD::MUL, MVT::i16, LibCall);
124 setOperationAction(ISD::MULHS, MVT::i16, Expand);
125 setOperationAction(ISD::MULHU, MVT::i16, Expand);
126 setOperationAction(ISD::SMUL_LOHI, MVT::i16, Expand);
127 setOperationAction(ISD::UMUL_LOHI, MVT::i16, Expand);
129 setOperationAction(ISD::UDIV, MVT::i8, Promote);
130 setOperationAction(ISD::UDIVREM, MVT::i8, Promote);
131 setOperationAction(ISD::UREM, MVT::i8, Promote);
132 setOperationAction(ISD::SDIV, MVT::i8, Promote);
133 setOperationAction(ISD::SDIVREM, MVT::i8, Promote);
134 setOperationAction(ISD::SREM, MVT::i8, Promote);
135 setOperationAction(ISD::UDIV, MVT::i16, LibCall);
136 setOperationAction(ISD::UDIVREM, MVT::i16, Expand);
137 setOperationAction(ISD::UREM, MVT::i16, LibCall);
138 setOperationAction(ISD::SDIV, MVT::i16, LibCall);
139 setOperationAction(ISD::SDIVREM, MVT::i16, Expand);
140 setOperationAction(ISD::SREM, MVT::i16, LibCall);
143 setOperationAction(ISD::VASTART, MVT::Other, Custom);
144 setOperationAction(ISD::VAARG, MVT::Other, Expand);
145 setOperationAction(ISD::VAEND, MVT::Other, Expand);
146 setOperationAction(ISD::VACOPY, MVT::Other, Expand);
147 setOperationAction(ISD::JumpTable, MVT::i16, Custom);
149 // EABI Libcalls - EABI Section 6.2
151 const RTLIB::Libcall Op;
152 const char * const Name;
153 const ISD::CondCode Cond;
155 // Floating point conversions - EABI Table 6
156 { RTLIB::FPROUND_F64_F32, "__mspabi_cvtdf", ISD::SETCC_INVALID },
157 { RTLIB::FPEXT_F32_F64, "__mspabi_cvtfd", ISD::SETCC_INVALID },
158 // The following is NOT implemented in libgcc
159 //{ RTLIB::FPTOSINT_F64_I16, "__mspabi_fixdi", ISD::SETCC_INVALID },
160 { RTLIB::FPTOSINT_F64_I32, "__mspabi_fixdli", ISD::SETCC_INVALID },
161 { RTLIB::FPTOSINT_F64_I64, "__mspabi_fixdlli", ISD::SETCC_INVALID },
162 // The following is NOT implemented in libgcc
163 //{ RTLIB::FPTOUINT_F64_I16, "__mspabi_fixdu", ISD::SETCC_INVALID },
164 { RTLIB::FPTOUINT_F64_I32, "__mspabi_fixdul", ISD::SETCC_INVALID },
165 { RTLIB::FPTOUINT_F64_I64, "__mspabi_fixdull", ISD::SETCC_INVALID },
166 // The following is NOT implemented in libgcc
167 //{ RTLIB::FPTOSINT_F32_I16, "__mspabi_fixfi", ISD::SETCC_INVALID },
168 { RTLIB::FPTOSINT_F32_I32, "__mspabi_fixfli", ISD::SETCC_INVALID },
169 { RTLIB::FPTOSINT_F32_I64, "__mspabi_fixflli", ISD::SETCC_INVALID },
170 // The following is NOT implemented in libgcc
171 //{ RTLIB::FPTOUINT_F32_I16, "__mspabi_fixfu", ISD::SETCC_INVALID },
172 { RTLIB::FPTOUINT_F32_I32, "__mspabi_fixful", ISD::SETCC_INVALID },
173 { RTLIB::FPTOUINT_F32_I64, "__mspabi_fixfull", ISD::SETCC_INVALID },
174 // TODO The following IS implemented in libgcc
175 //{ RTLIB::SINTTOFP_I16_F64, "__mspabi_fltid", ISD::SETCC_INVALID },
176 { RTLIB::SINTTOFP_I32_F64, "__mspabi_fltlid", ISD::SETCC_INVALID },
177 // TODO The following IS implemented in libgcc but is not in the EABI
178 { RTLIB::SINTTOFP_I64_F64, "__mspabi_fltllid", ISD::SETCC_INVALID },
179 // TODO The following IS implemented in libgcc
180 //{ RTLIB::UINTTOFP_I16_F64, "__mspabi_fltud", ISD::SETCC_INVALID },
181 { RTLIB::UINTTOFP_I32_F64, "__mspabi_fltuld", ISD::SETCC_INVALID },
182 // The following IS implemented in libgcc but is not in the EABI
183 { RTLIB::UINTTOFP_I64_F64, "__mspabi_fltulld", ISD::SETCC_INVALID },
184 // TODO The following IS implemented in libgcc
185 //{ RTLIB::SINTTOFP_I16_F32, "__mspabi_fltif", ISD::SETCC_INVALID },
186 { RTLIB::SINTTOFP_I32_F32, "__mspabi_fltlif", ISD::SETCC_INVALID },
187 // TODO The following IS implemented in libgcc but is not in the EABI
188 { RTLIB::SINTTOFP_I64_F32, "__mspabi_fltllif", ISD::SETCC_INVALID },
189 // TODO The following IS implemented in libgcc
190 //{ RTLIB::UINTTOFP_I16_F32, "__mspabi_fltuf", ISD::SETCC_INVALID },
191 { RTLIB::UINTTOFP_I32_F32, "__mspabi_fltulf", ISD::SETCC_INVALID },
192 // The following IS implemented in libgcc but is not in the EABI
193 { RTLIB::UINTTOFP_I64_F32, "__mspabi_fltullf", ISD::SETCC_INVALID },
195 // Floating point comparisons - EABI Table 7
196 { RTLIB::OEQ_F64, "__mspabi_cmpd", ISD::SETEQ },
197 { RTLIB::UNE_F64, "__mspabi_cmpd", ISD::SETNE },
198 { RTLIB::OGE_F64, "__mspabi_cmpd", ISD::SETGE },
199 { RTLIB::OLT_F64, "__mspabi_cmpd", ISD::SETLT },
200 { RTLIB::OLE_F64, "__mspabi_cmpd", ISD::SETLE },
201 { RTLIB::OGT_F64, "__mspabi_cmpd", ISD::SETGT },
202 { RTLIB::OEQ_F32, "__mspabi_cmpf", ISD::SETEQ },
203 { RTLIB::UNE_F32, "__mspabi_cmpf", ISD::SETNE },
204 { RTLIB::OGE_F32, "__mspabi_cmpf", ISD::SETGE },
205 { RTLIB::OLT_F32, "__mspabi_cmpf", ISD::SETLT },
206 { RTLIB::OLE_F32, "__mspabi_cmpf", ISD::SETLE },
207 { RTLIB::OGT_F32, "__mspabi_cmpf", ISD::SETGT },
209 // Floating point arithmetic - EABI Table 8
210 { RTLIB::ADD_F64, "__mspabi_addd", ISD::SETCC_INVALID },
211 { RTLIB::ADD_F32, "__mspabi_addf", ISD::SETCC_INVALID },
212 { RTLIB::DIV_F64, "__mspabi_divd", ISD::SETCC_INVALID },
213 { RTLIB::DIV_F32, "__mspabi_divf", ISD::SETCC_INVALID },
214 { RTLIB::MUL_F64, "__mspabi_mpyd", ISD::SETCC_INVALID },
215 { RTLIB::MUL_F32, "__mspabi_mpyf", ISD::SETCC_INVALID },
216 { RTLIB::SUB_F64, "__mspabi_subd", ISD::SETCC_INVALID },
217 { RTLIB::SUB_F32, "__mspabi_subf", ISD::SETCC_INVALID },
218 // The following are NOT implemented in libgcc
219 // { RTLIB::NEG_F64, "__mspabi_negd", ISD::SETCC_INVALID },
220 // { RTLIB::NEG_F32, "__mspabi_negf", ISD::SETCC_INVALID },
222 // Universal Integer Operations - EABI Table 9
223 { RTLIB::SDIV_I16, "__mspabi_divi", ISD::SETCC_INVALID },
224 { RTLIB::SDIV_I32, "__mspabi_divli", ISD::SETCC_INVALID },
225 { RTLIB::SDIV_I64, "__mspabi_divlli", ISD::SETCC_INVALID },
226 { RTLIB::UDIV_I16, "__mspabi_divu", ISD::SETCC_INVALID },
227 { RTLIB::UDIV_I32, "__mspabi_divul", ISD::SETCC_INVALID },
228 { RTLIB::UDIV_I64, "__mspabi_divull", ISD::SETCC_INVALID },
229 { RTLIB::SREM_I16, "__mspabi_remi", ISD::SETCC_INVALID },
230 { RTLIB::SREM_I32, "__mspabi_remli", ISD::SETCC_INVALID },
231 { RTLIB::SREM_I64, "__mspabi_remlli", ISD::SETCC_INVALID },
232 { RTLIB::UREM_I16, "__mspabi_remu", ISD::SETCC_INVALID },
233 { RTLIB::UREM_I32, "__mspabi_remul", ISD::SETCC_INVALID },
234 { RTLIB::UREM_I64, "__mspabi_remull", ISD::SETCC_INVALID },
236 // Bitwise Operations - EABI Table 10
237 // TODO: __mspabi_[srli/srai/slli] ARE implemented in libgcc
238 { RTLIB::SRL_I32, "__mspabi_srll", ISD::SETCC_INVALID },
239 { RTLIB::SRA_I32, "__mspabi_sral", ISD::SETCC_INVALID },
240 { RTLIB::SHL_I32, "__mspabi_slll", ISD::SETCC_INVALID },
241 // __mspabi_[srlll/srall/sllll/rlli/rlll] are NOT implemented in libgcc
245 for (const auto &LC : LibraryCalls) {
246 setLibcallName(LC.Op, LC.Name);
247 if (LC.Cond != ISD::SETCC_INVALID)
248 setCmpLibcallCC(LC.Op, LC.Cond);
251 if (STI.hasHWMult16()) {
253 const RTLIB::Libcall Op;
254 const char * const Name;
256 // Integer Multiply - EABI Table 9
257 { RTLIB::MUL_I16, "__mspabi_mpyi_hw" },
258 { RTLIB::MUL_I32, "__mspabi_mpyl_hw" },
259 { RTLIB::MUL_I64, "__mspabi_mpyll_hw" },
260 // TODO The __mspabi_mpysl*_hw functions ARE implemented in libgcc
261 // TODO The __mspabi_mpyul*_hw functions ARE implemented in libgcc
263 for (const auto &LC : LibraryCalls) {
264 setLibcallName(LC.Op, LC.Name);
266 } else if (STI.hasHWMult32()) {
268 const RTLIB::Libcall Op;
269 const char * const Name;
271 // Integer Multiply - EABI Table 9
272 { RTLIB::MUL_I16, "__mspabi_mpyi_hw" },
273 { RTLIB::MUL_I32, "__mspabi_mpyl_hw32" },
274 { RTLIB::MUL_I64, "__mspabi_mpyll_hw32" },
275 // TODO The __mspabi_mpysl*_hw32 functions ARE implemented in libgcc
276 // TODO The __mspabi_mpyul*_hw32 functions ARE implemented in libgcc
278 for (const auto &LC : LibraryCalls) {
279 setLibcallName(LC.Op, LC.Name);
281 } else if (STI.hasHWMultF5()) {
283 const RTLIB::Libcall Op;
284 const char * const Name;
286 // Integer Multiply - EABI Table 9
287 { RTLIB::MUL_I16, "__mspabi_mpyi_f5hw" },
288 { RTLIB::MUL_I32, "__mspabi_mpyl_f5hw" },
289 { RTLIB::MUL_I64, "__mspabi_mpyll_f5hw" },
290 // TODO The __mspabi_mpysl*_f5hw functions ARE implemented in libgcc
291 // TODO The __mspabi_mpyul*_f5hw functions ARE implemented in libgcc
293 for (const auto &LC : LibraryCalls) {
294 setLibcallName(LC.Op, LC.Name);
298 const RTLIB::Libcall Op;
299 const char * const Name;
301 // Integer Multiply - EABI Table 9
302 { RTLIB::MUL_I16, "__mspabi_mpyi" },
303 { RTLIB::MUL_I32, "__mspabi_mpyl" },
304 { RTLIB::MUL_I64, "__mspabi_mpyll" },
305 // The __mspabi_mpysl* functions are NOT implemented in libgcc
306 // The __mspabi_mpyul* functions are NOT implemented in libgcc
308 for (const auto &LC : LibraryCalls) {
309 setLibcallName(LC.Op, LC.Name);
311 setLibcallCallingConv(RTLIB::MUL_I64, CallingConv::MSP430_BUILTIN);
314 // Several of the runtime library functions use a special calling conv
315 setLibcallCallingConv(RTLIB::UDIV_I64, CallingConv::MSP430_BUILTIN);
316 setLibcallCallingConv(RTLIB::UREM_I64, CallingConv::MSP430_BUILTIN);
317 setLibcallCallingConv(RTLIB::SDIV_I64, CallingConv::MSP430_BUILTIN);
318 setLibcallCallingConv(RTLIB::SREM_I64, CallingConv::MSP430_BUILTIN);
319 setLibcallCallingConv(RTLIB::ADD_F64, CallingConv::MSP430_BUILTIN);
320 setLibcallCallingConv(RTLIB::SUB_F64, CallingConv::MSP430_BUILTIN);
321 setLibcallCallingConv(RTLIB::MUL_F64, CallingConv::MSP430_BUILTIN);
322 setLibcallCallingConv(RTLIB::DIV_F64, CallingConv::MSP430_BUILTIN);
323 setLibcallCallingConv(RTLIB::OEQ_F64, CallingConv::MSP430_BUILTIN);
324 setLibcallCallingConv(RTLIB::UNE_F64, CallingConv::MSP430_BUILTIN);
325 setLibcallCallingConv(RTLIB::OGE_F64, CallingConv::MSP430_BUILTIN);
326 setLibcallCallingConv(RTLIB::OLT_F64, CallingConv::MSP430_BUILTIN);
327 setLibcallCallingConv(RTLIB::OLE_F64, CallingConv::MSP430_BUILTIN);
328 setLibcallCallingConv(RTLIB::OGT_F64, CallingConv::MSP430_BUILTIN);
329 // TODO: __mspabi_srall, __mspabi_srlll, __mspabi_sllll
331 setMinFunctionAlignment(1);
332 setPrefFunctionAlignment(1);
335 SDValue MSP430TargetLowering::LowerOperation(SDValue Op,
336 SelectionDAG &DAG) const {
337 switch (Op.getOpcode()) {
338 case ISD::SHL: // FALLTHROUGH
340 case ISD::SRA: return LowerShifts(Op, DAG);
341 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
342 case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
343 case ISD::ExternalSymbol: return LowerExternalSymbol(Op, DAG);
344 case ISD::SETCC: return LowerSETCC(Op, DAG);
345 case ISD::BR_CC: return LowerBR_CC(Op, DAG);
346 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
347 case ISD::SIGN_EXTEND: return LowerSIGN_EXTEND(Op, DAG);
348 case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
349 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
350 case ISD::VASTART: return LowerVASTART(Op, DAG);
351 case ISD::JumpTable: return LowerJumpTable(Op, DAG);
353 llvm_unreachable("unimplemented operand");
357 //===----------------------------------------------------------------------===//
358 // MSP430 Inline Assembly Support
359 //===----------------------------------------------------------------------===//
361 /// getConstraintType - Given a constraint letter, return the type of
362 /// constraint it is for this target.
363 TargetLowering::ConstraintType
364 MSP430TargetLowering::getConstraintType(StringRef Constraint) const {
365 if (Constraint.size() == 1) {
366 switch (Constraint[0]) {
368 return C_RegisterClass;
373 return TargetLowering::getConstraintType(Constraint);
376 std::pair<unsigned, const TargetRegisterClass *>
377 MSP430TargetLowering::getRegForInlineAsmConstraint(
378 const TargetRegisterInfo *TRI, StringRef Constraint, MVT VT) const {
379 if (Constraint.size() == 1) {
380 // GCC Constraint Letters
381 switch (Constraint[0]) {
383 case 'r': // GENERAL_REGS
385 return std::make_pair(0U, &MSP430::GR8RegClass);
387 return std::make_pair(0U, &MSP430::GR16RegClass);
391 return TargetLowering::getRegForInlineAsmConstraint(TRI, Constraint, VT);
394 //===----------------------------------------------------------------------===//
395 // Calling Convention Implementation
396 //===----------------------------------------------------------------------===//
398 #include "MSP430GenCallingConv.inc"
400 /// For each argument in a function store the number of pieces it is composed
402 template<typename ArgT>
403 static void ParseFunctionArgs(const SmallVectorImpl<ArgT> &Args,
404 SmallVectorImpl<unsigned> &Out) {
405 unsigned CurrentArgIndex;
410 CurrentArgIndex = Args[0].OrigArgIndex;
413 for (auto &Arg : Args) {
414 if (CurrentArgIndex == Arg.OrigArgIndex) {
418 CurrentArgIndex = Arg.OrigArgIndex;
423 static void AnalyzeVarArgs(CCState &State,
424 const SmallVectorImpl<ISD::OutputArg> &Outs) {
425 State.AnalyzeCallOperands(Outs, CC_MSP430_AssignStack);
428 static void AnalyzeVarArgs(CCState &State,
429 const SmallVectorImpl<ISD::InputArg> &Ins) {
430 State.AnalyzeFormalArguments(Ins, CC_MSP430_AssignStack);
433 /// Analyze incoming and outgoing function arguments. We need custom C++ code
434 /// to handle special constraints in the ABI like reversing the order of the
435 /// pieces of splitted arguments. In addition, all pieces of a certain argument
436 /// have to be passed either using registers or the stack but never mixing both.
437 template<typename ArgT>
438 static void AnalyzeArguments(CCState &State,
439 SmallVectorImpl<CCValAssign> &ArgLocs,
440 const SmallVectorImpl<ArgT> &Args) {
441 static const MCPhysReg CRegList[] = {
442 MSP430::R12, MSP430::R13, MSP430::R14, MSP430::R15
444 static const unsigned CNbRegs = array_lengthof(CRegList);
445 static const MCPhysReg BuiltinRegList[] = {
446 MSP430::R8, MSP430::R9, MSP430::R10, MSP430::R11,
447 MSP430::R12, MSP430::R13, MSP430::R14, MSP430::R15
449 static const unsigned BuiltinNbRegs = array_lengthof(BuiltinRegList);
451 ArrayRef<MCPhysReg> RegList;
454 bool Builtin = (State.getCallingConv() == CallingConv::MSP430_BUILTIN);
456 RegList = BuiltinRegList;
457 NbRegs = BuiltinNbRegs;
463 if (State.isVarArg()) {
464 AnalyzeVarArgs(State, Args);
468 SmallVector<unsigned, 4> ArgsParts;
469 ParseFunctionArgs(Args, ArgsParts);
472 assert(ArgsParts.size() == 2 &&
473 "Builtin calling convention requires two arguments");
476 unsigned RegsLeft = NbRegs;
477 bool UsedStack = false;
480 for (unsigned i = 0, e = ArgsParts.size(); i != e; i++) {
481 MVT ArgVT = Args[ValNo].VT;
482 ISD::ArgFlagsTy ArgFlags = Args[ValNo].Flags;
484 CCValAssign::LocInfo LocInfo = CCValAssign::Full;
487 if (LocVT == MVT::i8) {
489 if (ArgFlags.isSExt())
490 LocInfo = CCValAssign::SExt;
491 else if (ArgFlags.isZExt())
492 LocInfo = CCValAssign::ZExt;
494 LocInfo = CCValAssign::AExt;
497 // Handle byval arguments
498 if (ArgFlags.isByVal()) {
499 State.HandleByVal(ValNo++, ArgVT, LocVT, LocInfo, 2, 2, ArgFlags);
503 unsigned Parts = ArgsParts[i];
507 "Builtin calling convention requires 64-bit arguments");
510 if (!UsedStack && Parts == 2 && RegsLeft == 1) {
511 // Special case for 32-bit register split, see EABI section 3.3.3
512 unsigned Reg = State.AllocateReg(RegList);
513 State.addLoc(CCValAssign::getReg(ValNo++, ArgVT, Reg, LocVT, LocInfo));
517 CC_MSP430_AssignStack(ValNo++, ArgVT, LocVT, LocInfo, ArgFlags, State);
518 } else if (Parts <= RegsLeft) {
519 for (unsigned j = 0; j < Parts; j++) {
520 unsigned Reg = State.AllocateReg(RegList);
521 State.addLoc(CCValAssign::getReg(ValNo++, ArgVT, Reg, LocVT, LocInfo));
526 for (unsigned j = 0; j < Parts; j++)
527 CC_MSP430_AssignStack(ValNo++, ArgVT, LocVT, LocInfo, ArgFlags, State);
532 static void AnalyzeRetResult(CCState &State,
533 const SmallVectorImpl<ISD::InputArg> &Ins) {
534 State.AnalyzeCallResult(Ins, RetCC_MSP430);
537 static void AnalyzeRetResult(CCState &State,
538 const SmallVectorImpl<ISD::OutputArg> &Outs) {
539 State.AnalyzeReturn(Outs, RetCC_MSP430);
542 template<typename ArgT>
543 static void AnalyzeReturnValues(CCState &State,
544 SmallVectorImpl<CCValAssign> &RVLocs,
545 const SmallVectorImpl<ArgT> &Args) {
546 AnalyzeRetResult(State, Args);
549 SDValue MSP430TargetLowering::LowerFormalArguments(
550 SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
551 const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl,
552 SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const {
556 report_fatal_error("Unsupported calling convention");
558 case CallingConv::Fast:
559 return LowerCCCArguments(Chain, CallConv, isVarArg, Ins, dl, DAG, InVals);
560 case CallingConv::MSP430_INTR:
563 report_fatal_error("ISRs cannot have arguments");
568 MSP430TargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
569 SmallVectorImpl<SDValue> &InVals) const {
570 SelectionDAG &DAG = CLI.DAG;
572 SmallVectorImpl<ISD::OutputArg> &Outs = CLI.Outs;
573 SmallVectorImpl<SDValue> &OutVals = CLI.OutVals;
574 SmallVectorImpl<ISD::InputArg> &Ins = CLI.Ins;
575 SDValue Chain = CLI.Chain;
576 SDValue Callee = CLI.Callee;
577 bool &isTailCall = CLI.IsTailCall;
578 CallingConv::ID CallConv = CLI.CallConv;
579 bool isVarArg = CLI.IsVarArg;
581 // MSP430 target does not yet support tail call optimization.
586 report_fatal_error("Unsupported calling convention");
587 case CallingConv::MSP430_BUILTIN:
588 case CallingConv::Fast:
590 return LowerCCCCallTo(Chain, Callee, CallConv, isVarArg, isTailCall,
591 Outs, OutVals, Ins, dl, DAG, InVals);
592 case CallingConv::MSP430_INTR:
593 report_fatal_error("ISRs cannot be called directly");
597 /// LowerCCCArguments - transform physical registers into virtual registers and
598 /// generate load operations for arguments places on the stack.
599 // FIXME: struct return stuff
600 SDValue MSP430TargetLowering::LowerCCCArguments(
601 SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
602 const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl,
603 SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const {
604 MachineFunction &MF = DAG.getMachineFunction();
605 MachineFrameInfo &MFI = MF.getFrameInfo();
606 MachineRegisterInfo &RegInfo = MF.getRegInfo();
607 MSP430MachineFunctionInfo *FuncInfo = MF.getInfo<MSP430MachineFunctionInfo>();
609 // Assign locations to all of the incoming arguments.
610 SmallVector<CCValAssign, 16> ArgLocs;
611 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), ArgLocs,
613 AnalyzeArguments(CCInfo, ArgLocs, Ins);
615 // Create frame index for the start of the first vararg value
617 unsigned Offset = CCInfo.getNextStackOffset();
618 FuncInfo->setVarArgsFrameIndex(MFI.CreateFixedObject(1, Offset, true));
621 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
622 CCValAssign &VA = ArgLocs[i];
624 // Arguments passed in registers
625 EVT RegVT = VA.getLocVT();
626 switch (RegVT.getSimpleVT().SimpleTy) {
630 errs() << "LowerFormalArguments Unhandled argument type: "
631 << RegVT.getEVTString() << "\n";
633 llvm_unreachable(nullptr);
636 unsigned VReg = RegInfo.createVirtualRegister(&MSP430::GR16RegClass);
637 RegInfo.addLiveIn(VA.getLocReg(), VReg);
638 SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, VReg, RegVT);
640 // If this is an 8-bit value, it is really passed promoted to 16
641 // bits. Insert an assert[sz]ext to capture this, then truncate to the
643 if (VA.getLocInfo() == CCValAssign::SExt)
644 ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
645 DAG.getValueType(VA.getValVT()));
646 else if (VA.getLocInfo() == CCValAssign::ZExt)
647 ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
648 DAG.getValueType(VA.getValVT()));
650 if (VA.getLocInfo() != CCValAssign::Full)
651 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
653 InVals.push_back(ArgValue);
657 assert(VA.isMemLoc());
660 ISD::ArgFlagsTy Flags = Ins[i].Flags;
662 if (Flags.isByVal()) {
663 int FI = MFI.CreateFixedObject(Flags.getByValSize(),
664 VA.getLocMemOffset(), true);
665 InVal = DAG.getFrameIndex(FI, getPointerTy(DAG.getDataLayout()));
667 // Load the argument to a virtual register
668 unsigned ObjSize = VA.getLocVT().getSizeInBits()/8;
670 errs() << "LowerFormalArguments Unhandled argument type: "
671 << EVT(VA.getLocVT()).getEVTString()
674 // Create the frame index object for this incoming parameter...
675 int FI = MFI.CreateFixedObject(ObjSize, VA.getLocMemOffset(), true);
677 // Create the SelectionDAG nodes corresponding to a load
678 //from this parameter
679 SDValue FIN = DAG.getFrameIndex(FI, MVT::i16);
681 VA.getLocVT(), dl, Chain, FIN,
682 MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FI));
685 InVals.push_back(InVal);
689 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
690 if (Ins[i].Flags.isSRet()) {
691 unsigned Reg = FuncInfo->getSRetReturnReg();
693 Reg = MF.getRegInfo().createVirtualRegister(
694 getRegClassFor(MVT::i16));
695 FuncInfo->setSRetReturnReg(Reg);
697 SDValue Copy = DAG.getCopyToReg(DAG.getEntryNode(), dl, Reg, InVals[i]);
698 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Copy, Chain);
706 MSP430TargetLowering::CanLowerReturn(CallingConv::ID CallConv,
709 const SmallVectorImpl<ISD::OutputArg> &Outs,
710 LLVMContext &Context) const {
711 SmallVector<CCValAssign, 16> RVLocs;
712 CCState CCInfo(CallConv, IsVarArg, MF, RVLocs, Context);
713 return CCInfo.CheckReturn(Outs, RetCC_MSP430);
717 MSP430TargetLowering::LowerReturn(SDValue Chain, CallingConv::ID CallConv,
719 const SmallVectorImpl<ISD::OutputArg> &Outs,
720 const SmallVectorImpl<SDValue> &OutVals,
721 const SDLoc &dl, SelectionDAG &DAG) const {
723 MachineFunction &MF = DAG.getMachineFunction();
725 // CCValAssign - represent the assignment of the return value to a location
726 SmallVector<CCValAssign, 16> RVLocs;
728 // ISRs cannot return any value.
729 if (CallConv == CallingConv::MSP430_INTR && !Outs.empty())
730 report_fatal_error("ISRs cannot return any value");
732 // CCState - Info about the registers and stack slot.
733 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), RVLocs,
736 // Analize return values.
737 AnalyzeReturnValues(CCInfo, RVLocs, Outs);
740 SmallVector<SDValue, 4> RetOps(1, Chain);
742 // Copy the result values into the output registers.
743 for (unsigned i = 0; i != RVLocs.size(); ++i) {
744 CCValAssign &VA = RVLocs[i];
745 assert(VA.isRegLoc() && "Can only return in registers!");
747 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
750 // Guarantee that all emitted copies are stuck together,
751 // avoiding something bad.
752 Flag = Chain.getValue(1);
753 RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT()));
756 if (MF.getFunction().hasStructRetAttr()) {
757 MSP430MachineFunctionInfo *FuncInfo = MF.getInfo<MSP430MachineFunctionInfo>();
758 unsigned Reg = FuncInfo->getSRetReturnReg();
761 llvm_unreachable("sret virtual register not created in entry block");
764 DAG.getCopyFromReg(Chain, dl, Reg, getPointerTy(DAG.getDataLayout()));
765 unsigned R12 = MSP430::R12;
767 Chain = DAG.getCopyToReg(Chain, dl, R12, Val, Flag);
768 Flag = Chain.getValue(1);
769 RetOps.push_back(DAG.getRegister(R12, getPointerTy(DAG.getDataLayout())));
772 unsigned Opc = (CallConv == CallingConv::MSP430_INTR ?
773 MSP430ISD::RETI_FLAG : MSP430ISD::RET_FLAG);
775 RetOps[0] = Chain; // Update chain.
777 // Add the flag if we have it.
779 RetOps.push_back(Flag);
781 return DAG.getNode(Opc, dl, MVT::Other, RetOps);
784 /// LowerCCCCallTo - functions arguments are copied from virtual regs to
785 /// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted.
786 SDValue MSP430TargetLowering::LowerCCCCallTo(
787 SDValue Chain, SDValue Callee, CallingConv::ID CallConv, bool isVarArg,
788 bool isTailCall, const SmallVectorImpl<ISD::OutputArg> &Outs,
789 const SmallVectorImpl<SDValue> &OutVals,
790 const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl,
791 SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const {
792 // Analyze operands of the call, assigning locations to each operand.
793 SmallVector<CCValAssign, 16> ArgLocs;
794 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), ArgLocs,
796 AnalyzeArguments(CCInfo, ArgLocs, Outs);
798 // Get a count of how many bytes are to be pushed on the stack.
799 unsigned NumBytes = CCInfo.getNextStackOffset();
800 auto PtrVT = getPointerTy(DAG.getDataLayout());
802 Chain = DAG.getCALLSEQ_START(Chain, NumBytes, 0, dl);
804 SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
805 SmallVector<SDValue, 12> MemOpChains;
808 // Walk the register/memloc assignments, inserting copies/loads.
809 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
810 CCValAssign &VA = ArgLocs[i];
812 SDValue Arg = OutVals[i];
814 // Promote the value if needed.
815 switch (VA.getLocInfo()) {
816 default: llvm_unreachable("Unknown loc info!");
817 case CCValAssign::Full: break;
818 case CCValAssign::SExt:
819 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
821 case CCValAssign::ZExt:
822 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
824 case CCValAssign::AExt:
825 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
829 // Arguments that can be passed on register must be kept at RegsToPass
832 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
834 assert(VA.isMemLoc());
836 if (!StackPtr.getNode())
837 StackPtr = DAG.getCopyFromReg(Chain, dl, MSP430::SP, PtrVT);
840 DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr,
841 DAG.getIntPtrConstant(VA.getLocMemOffset(), dl));
844 ISD::ArgFlagsTy Flags = Outs[i].Flags;
846 if (Flags.isByVal()) {
847 SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), dl, MVT::i16);
848 MemOp = DAG.getMemcpy(Chain, dl, PtrOff, Arg, SizeNode,
849 Flags.getByValAlign(),
851 /*AlwaysInline=*/true,
852 /*isTailCall=*/false,
853 MachinePointerInfo(),
854 MachinePointerInfo());
856 MemOp = DAG.getStore(Chain, dl, Arg, PtrOff, MachinePointerInfo());
859 MemOpChains.push_back(MemOp);
863 // Transform all store nodes into one single node because all store nodes are
864 // independent of each other.
865 if (!MemOpChains.empty())
866 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOpChains);
868 // Build a sequence of copy-to-reg nodes chained together with token chain and
869 // flag operands which copy the outgoing args into registers. The InFlag in
870 // necessary since all emitted instructions must be stuck together.
872 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
873 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
874 RegsToPass[i].second, InFlag);
875 InFlag = Chain.getValue(1);
878 // If the callee is a GlobalAddress node (quite common, every direct call is)
879 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
880 // Likewise ExternalSymbol -> TargetExternalSymbol.
881 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
882 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl, MVT::i16);
883 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
884 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i16);
886 // Returns a chain & a flag for retval copy to use.
887 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
888 SmallVector<SDValue, 8> Ops;
889 Ops.push_back(Chain);
890 Ops.push_back(Callee);
892 // Add argument registers to the end of the list so that they are
893 // known live into the call.
894 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
895 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
896 RegsToPass[i].second.getValueType()));
898 if (InFlag.getNode())
899 Ops.push_back(InFlag);
901 Chain = DAG.getNode(MSP430ISD::CALL, dl, NodeTys, Ops);
902 InFlag = Chain.getValue(1);
904 // Create the CALLSEQ_END node.
905 Chain = DAG.getCALLSEQ_END(Chain, DAG.getConstant(NumBytes, dl, PtrVT, true),
906 DAG.getConstant(0, dl, PtrVT, true), InFlag, dl);
907 InFlag = Chain.getValue(1);
909 // Handle result values, copying them out of physregs into vregs that we
911 return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins, dl,
915 /// LowerCallResult - Lower the result values of a call into the
916 /// appropriate copies out of appropriate physical registers.
918 SDValue MSP430TargetLowering::LowerCallResult(
919 SDValue Chain, SDValue InFlag, CallingConv::ID CallConv, bool isVarArg,
920 const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl,
921 SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const {
923 // Assign locations to each value returned by this call.
924 SmallVector<CCValAssign, 16> RVLocs;
925 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), RVLocs,
928 AnalyzeReturnValues(CCInfo, RVLocs, Ins);
930 // Copy all of the result registers out of their specified physreg.
931 for (unsigned i = 0; i != RVLocs.size(); ++i) {
932 Chain = DAG.getCopyFromReg(Chain, dl, RVLocs[i].getLocReg(),
933 RVLocs[i].getValVT(), InFlag).getValue(1);
934 InFlag = Chain.getValue(2);
935 InVals.push_back(Chain.getValue(0));
941 SDValue MSP430TargetLowering::LowerShifts(SDValue Op,
942 SelectionDAG &DAG) const {
943 unsigned Opc = Op.getOpcode();
944 SDNode* N = Op.getNode();
945 EVT VT = Op.getValueType();
948 // Expand non-constant shifts to loops:
949 if (!isa<ConstantSDNode>(N->getOperand(1)))
952 uint64_t ShiftAmount = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue();
954 // Expand the stuff into sequence of shifts.
955 SDValue Victim = N->getOperand(0);
957 if (ShiftAmount >= 8) {
958 assert(VT == MVT::i16 && "Can not shift i8 by 8 and more");
961 llvm_unreachable("Unknown shift");
963 // foo << (8 + N) => swpb(zext(foo)) << N
964 Victim = DAG.getZeroExtendInReg(Victim, dl, MVT::i8);
965 Victim = DAG.getNode(ISD::BSWAP, dl, VT, Victim);
969 // foo >> (8 + N) => sxt(swpb(foo)) >> N
970 Victim = DAG.getNode(ISD::BSWAP, dl, VT, Victim);
971 Victim = (Opc == ISD::SRA)
972 ? DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, VT, Victim,
973 DAG.getValueType(MVT::i8))
974 : DAG.getZeroExtendInReg(Victim, dl, MVT::i8);
980 if (Opc == ISD::SRL && ShiftAmount) {
981 // Emit a special goodness here:
982 // srl A, 1 => clrc; rrc A
983 Victim = DAG.getNode(MSP430ISD::RRCL, dl, VT, Victim);
987 while (ShiftAmount--)
988 Victim = DAG.getNode((Opc == ISD::SHL ? MSP430ISD::RLA : MSP430ISD::RRA),
994 SDValue MSP430TargetLowering::LowerGlobalAddress(SDValue Op,
995 SelectionDAG &DAG) const {
996 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
997 int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset();
998 auto PtrVT = getPointerTy(DAG.getDataLayout());
1000 // Create the TargetGlobalAddress node, folding in the constant offset.
1001 SDValue Result = DAG.getTargetGlobalAddress(GV, SDLoc(Op), PtrVT, Offset);
1002 return DAG.getNode(MSP430ISD::Wrapper, SDLoc(Op), PtrVT, Result);
1005 SDValue MSP430TargetLowering::LowerExternalSymbol(SDValue Op,
1006 SelectionDAG &DAG) const {
1008 const char *Sym = cast<ExternalSymbolSDNode>(Op)->getSymbol();
1009 auto PtrVT = getPointerTy(DAG.getDataLayout());
1010 SDValue Result = DAG.getTargetExternalSymbol(Sym, PtrVT);
1012 return DAG.getNode(MSP430ISD::Wrapper, dl, PtrVT, Result);
1015 SDValue MSP430TargetLowering::LowerBlockAddress(SDValue Op,
1016 SelectionDAG &DAG) const {
1018 auto PtrVT = getPointerTy(DAG.getDataLayout());
1019 const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
1020 SDValue Result = DAG.getTargetBlockAddress(BA, PtrVT);
1022 return DAG.getNode(MSP430ISD::Wrapper, dl, PtrVT, Result);
1025 static SDValue EmitCMP(SDValue &LHS, SDValue &RHS, SDValue &TargetCC,
1026 ISD::CondCode CC, const SDLoc &dl, SelectionDAG &DAG) {
1027 // FIXME: Handle bittests someday
1028 assert(!LHS.getValueType().isFloatingPoint() && "We don't handle FP yet");
1030 // FIXME: Handle jump negative someday
1031 MSP430CC::CondCodes TCC = MSP430CC::COND_INVALID;
1033 default: llvm_unreachable("Invalid integer condition!");
1035 TCC = MSP430CC::COND_E; // aka COND_Z
1036 // Minor optimization: if LHS is a constant, swap operands, then the
1037 // constant can be folded into comparison.
1038 if (LHS.getOpcode() == ISD::Constant)
1039 std::swap(LHS, RHS);
1042 TCC = MSP430CC::COND_NE; // aka COND_NZ
1043 // Minor optimization: if LHS is a constant, swap operands, then the
1044 // constant can be folded into comparison.
1045 if (LHS.getOpcode() == ISD::Constant)
1046 std::swap(LHS, RHS);
1049 std::swap(LHS, RHS);
1052 // Turn lhs u>= rhs with lhs constant into rhs u< lhs+1, this allows us to
1053 // fold constant into instruction.
1054 if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) {
1056 RHS = DAG.getConstant(C->getSExtValue() + 1, dl, C->getValueType(0));
1057 TCC = MSP430CC::COND_LO;
1060 TCC = MSP430CC::COND_HS; // aka COND_C
1063 std::swap(LHS, RHS);
1066 // Turn lhs u< rhs with lhs constant into rhs u>= lhs+1, this allows us to
1067 // fold constant into instruction.
1068 if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) {
1070 RHS = DAG.getConstant(C->getSExtValue() + 1, dl, C->getValueType(0));
1071 TCC = MSP430CC::COND_HS;
1074 TCC = MSP430CC::COND_LO; // aka COND_NC
1077 std::swap(LHS, RHS);
1080 // Turn lhs >= rhs with lhs constant into rhs < lhs+1, this allows us to
1081 // fold constant into instruction.
1082 if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) {
1084 RHS = DAG.getConstant(C->getSExtValue() + 1, dl, C->getValueType(0));
1085 TCC = MSP430CC::COND_L;
1088 TCC = MSP430CC::COND_GE;
1091 std::swap(LHS, RHS);
1094 // Turn lhs < rhs with lhs constant into rhs >= lhs+1, this allows us to
1095 // fold constant into instruction.
1096 if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) {
1098 RHS = DAG.getConstant(C->getSExtValue() + 1, dl, C->getValueType(0));
1099 TCC = MSP430CC::COND_GE;
1102 TCC = MSP430CC::COND_L;
1106 TargetCC = DAG.getConstant(TCC, dl, MVT::i8);
1107 return DAG.getNode(MSP430ISD::CMP, dl, MVT::Glue, LHS, RHS);
1111 SDValue MSP430TargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) const {
1112 SDValue Chain = Op.getOperand(0);
1113 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
1114 SDValue LHS = Op.getOperand(2);
1115 SDValue RHS = Op.getOperand(3);
1116 SDValue Dest = Op.getOperand(4);
1120 SDValue Flag = EmitCMP(LHS, RHS, TargetCC, CC, dl, DAG);
1122 return DAG.getNode(MSP430ISD::BR_CC, dl, Op.getValueType(),
1123 Chain, Dest, TargetCC, Flag);
1126 SDValue MSP430TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
1127 SDValue LHS = Op.getOperand(0);
1128 SDValue RHS = Op.getOperand(1);
1131 // If we are doing an AND and testing against zero, then the CMP
1132 // will not be generated. The AND (or BIT) will generate the condition codes,
1133 // but they are different from CMP.
1134 // FIXME: since we're doing a post-processing, use a pseudoinstr here, so
1135 // lowering & isel wouldn't diverge.
1137 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS)) {
1138 if (RHSC->isNullValue() && LHS.hasOneUse() &&
1139 (LHS.getOpcode() == ISD::AND ||
1140 (LHS.getOpcode() == ISD::TRUNCATE &&
1141 LHS.getOperand(0).getOpcode() == ISD::AND))) {
1145 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
1147 SDValue Flag = EmitCMP(LHS, RHS, TargetCC, CC, dl, DAG);
1149 // Get the condition codes directly from the status register, if its easy.
1150 // Otherwise a branch will be generated. Note that the AND and BIT
1151 // instructions generate different flags than CMP, the carry bit can be used
1153 bool Invert = false;
1155 bool Convert = true;
1156 switch (cast<ConstantSDNode>(TargetCC)->getZExtValue()) {
1160 case MSP430CC::COND_HS:
1161 // Res = SR & 1, no processing is required
1163 case MSP430CC::COND_LO:
1167 case MSP430CC::COND_NE:
1169 // C = ~Z, thus Res = SR & 1, no processing is required
1171 // Res = ~((SR >> 1) & 1)
1176 case MSP430CC::COND_E:
1178 // C = ~Z for AND instruction, thus we can put Res = ~(SR & 1), however,
1179 // Res = (SR >> 1) & 1 is 1 word shorter.
1182 EVT VT = Op.getValueType();
1183 SDValue One = DAG.getConstant(1, dl, VT);
1185 SDValue SR = DAG.getCopyFromReg(DAG.getEntryNode(), dl, MSP430::SR,
1188 // FIXME: somewhere this is turned into a SRL, lower it MSP specific?
1189 SR = DAG.getNode(ISD::SRA, dl, MVT::i16, SR, One);
1190 SR = DAG.getNode(ISD::AND, dl, MVT::i16, SR, One);
1192 SR = DAG.getNode(ISD::XOR, dl, MVT::i16, SR, One);
1195 SDValue Zero = DAG.getConstant(0, dl, VT);
1196 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Glue);
1197 SDValue Ops[] = {One, Zero, TargetCC, Flag};
1198 return DAG.getNode(MSP430ISD::SELECT_CC, dl, VTs, Ops);
1202 SDValue MSP430TargetLowering::LowerSELECT_CC(SDValue Op,
1203 SelectionDAG &DAG) const {
1204 SDValue LHS = Op.getOperand(0);
1205 SDValue RHS = Op.getOperand(1);
1206 SDValue TrueV = Op.getOperand(2);
1207 SDValue FalseV = Op.getOperand(3);
1208 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
1212 SDValue Flag = EmitCMP(LHS, RHS, TargetCC, CC, dl, DAG);
1214 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Glue);
1215 SDValue Ops[] = {TrueV, FalseV, TargetCC, Flag};
1217 return DAG.getNode(MSP430ISD::SELECT_CC, dl, VTs, Ops);
1220 SDValue MSP430TargetLowering::LowerSIGN_EXTEND(SDValue Op,
1221 SelectionDAG &DAG) const {
1222 SDValue Val = Op.getOperand(0);
1223 EVT VT = Op.getValueType();
1226 assert(VT == MVT::i16 && "Only support i16 for now!");
1228 return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, VT,
1229 DAG.getNode(ISD::ANY_EXTEND, dl, VT, Val),
1230 DAG.getValueType(Val.getValueType()));
1234 MSP430TargetLowering::getReturnAddressFrameIndex(SelectionDAG &DAG) const {
1235 MachineFunction &MF = DAG.getMachineFunction();
1236 MSP430MachineFunctionInfo *FuncInfo = MF.getInfo<MSP430MachineFunctionInfo>();
1237 int ReturnAddrIndex = FuncInfo->getRAIndex();
1238 auto PtrVT = getPointerTy(MF.getDataLayout());
1240 if (ReturnAddrIndex == 0) {
1241 // Set up a frame object for the return address.
1242 uint64_t SlotSize = MF.getDataLayout().getPointerSize();
1243 ReturnAddrIndex = MF.getFrameInfo().CreateFixedObject(SlotSize, -SlotSize,
1245 FuncInfo->setRAIndex(ReturnAddrIndex);
1248 return DAG.getFrameIndex(ReturnAddrIndex, PtrVT);
1251 SDValue MSP430TargetLowering::LowerRETURNADDR(SDValue Op,
1252 SelectionDAG &DAG) const {
1253 MachineFrameInfo &MFI = DAG.getMachineFunction().getFrameInfo();
1254 MFI.setReturnAddressIsTaken(true);
1256 if (verifyReturnAddressArgumentIsConstant(Op, DAG))
1259 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
1261 auto PtrVT = getPointerTy(DAG.getDataLayout());
1264 SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
1266 DAG.getConstant(DAG.getDataLayout().getPointerSize(), dl, MVT::i16);
1267 return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
1268 DAG.getNode(ISD::ADD, dl, PtrVT, FrameAddr, Offset),
1269 MachinePointerInfo());
1272 // Just load the return address.
1273 SDValue RetAddrFI = getReturnAddressFrameIndex(DAG);
1274 return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), RetAddrFI,
1275 MachinePointerInfo());
1278 SDValue MSP430TargetLowering::LowerFRAMEADDR(SDValue Op,
1279 SelectionDAG &DAG) const {
1280 MachineFrameInfo &MFI = DAG.getMachineFunction().getFrameInfo();
1281 MFI.setFrameAddressIsTaken(true);
1283 EVT VT = Op.getValueType();
1284 SDLoc dl(Op); // FIXME probably not meaningful
1285 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
1286 SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl,
1289 FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr,
1290 MachinePointerInfo());
1294 SDValue MSP430TargetLowering::LowerVASTART(SDValue Op,
1295 SelectionDAG &DAG) const {
1296 MachineFunction &MF = DAG.getMachineFunction();
1297 MSP430MachineFunctionInfo *FuncInfo = MF.getInfo<MSP430MachineFunctionInfo>();
1298 auto PtrVT = getPointerTy(DAG.getDataLayout());
1300 // Frame index of first vararg argument
1301 SDValue FrameIndex =
1302 DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
1303 const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
1305 // Create a store of the frame index to the location operand
1306 return DAG.getStore(Op.getOperand(0), SDLoc(Op), FrameIndex, Op.getOperand(1),
1307 MachinePointerInfo(SV));
1310 SDValue MSP430TargetLowering::LowerJumpTable(SDValue Op,
1311 SelectionDAG &DAG) const {
1312 JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
1313 auto PtrVT = getPointerTy(DAG.getDataLayout());
1314 SDValue Result = DAG.getTargetJumpTable(JT->getIndex(), PtrVT);
1315 return DAG.getNode(MSP430ISD::Wrapper, SDLoc(JT), PtrVT, Result);
1318 /// getPostIndexedAddressParts - returns true by value, base pointer and
1319 /// offset pointer and addressing mode by reference if this node can be
1320 /// combined with a load / store to form a post-indexed load / store.
1321 bool MSP430TargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
1324 ISD::MemIndexedMode &AM,
1325 SelectionDAG &DAG) const {
1327 LoadSDNode *LD = cast<LoadSDNode>(N);
1328 if (LD->getExtensionType() != ISD::NON_EXTLOAD)
1331 EVT VT = LD->getMemoryVT();
1332 if (VT != MVT::i8 && VT != MVT::i16)
1335 if (Op->getOpcode() != ISD::ADD)
1338 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Op->getOperand(1))) {
1339 uint64_t RHSC = RHS->getZExtValue();
1340 if ((VT == MVT::i16 && RHSC != 2) ||
1341 (VT == MVT::i8 && RHSC != 1))
1344 Base = Op->getOperand(0);
1345 Offset = DAG.getConstant(RHSC, SDLoc(N), VT);
1354 const char *MSP430TargetLowering::getTargetNodeName(unsigned Opcode) const {
1355 switch ((MSP430ISD::NodeType)Opcode) {
1356 case MSP430ISD::FIRST_NUMBER: break;
1357 case MSP430ISD::RET_FLAG: return "MSP430ISD::RET_FLAG";
1358 case MSP430ISD::RETI_FLAG: return "MSP430ISD::RETI_FLAG";
1359 case MSP430ISD::RRA: return "MSP430ISD::RRA";
1360 case MSP430ISD::RLA: return "MSP430ISD::RLA";
1361 case MSP430ISD::RRC: return "MSP430ISD::RRC";
1362 case MSP430ISD::RRCL: return "MSP430ISD::RRCL";
1363 case MSP430ISD::CALL: return "MSP430ISD::CALL";
1364 case MSP430ISD::Wrapper: return "MSP430ISD::Wrapper";
1365 case MSP430ISD::BR_CC: return "MSP430ISD::BR_CC";
1366 case MSP430ISD::CMP: return "MSP430ISD::CMP";
1367 case MSP430ISD::SETCC: return "MSP430ISD::SETCC";
1368 case MSP430ISD::SELECT_CC: return "MSP430ISD::SELECT_CC";
1369 case MSP430ISD::DADD: return "MSP430ISD::DADD";
1374 bool MSP430TargetLowering::isTruncateFree(Type *Ty1,
1376 if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy())
1379 return (Ty1->getPrimitiveSizeInBits() > Ty2->getPrimitiveSizeInBits());
1382 bool MSP430TargetLowering::isTruncateFree(EVT VT1, EVT VT2) const {
1383 if (!VT1.isInteger() || !VT2.isInteger())
1386 return (VT1.getSizeInBits() > VT2.getSizeInBits());
1389 bool MSP430TargetLowering::isZExtFree(Type *Ty1, Type *Ty2) const {
1390 // MSP430 implicitly zero-extends 8-bit results in 16-bit registers.
1391 return 0 && Ty1->isIntegerTy(8) && Ty2->isIntegerTy(16);
1394 bool MSP430TargetLowering::isZExtFree(EVT VT1, EVT VT2) const {
1395 // MSP430 implicitly zero-extends 8-bit results in 16-bit registers.
1396 return 0 && VT1 == MVT::i8 && VT2 == MVT::i16;
1399 bool MSP430TargetLowering::isZExtFree(SDValue Val, EVT VT2) const {
1400 return isZExtFree(Val.getValueType(), VT2);
1403 //===----------------------------------------------------------------------===//
1404 // Other Lowering Code
1405 //===----------------------------------------------------------------------===//
1408 MSP430TargetLowering::EmitShiftInstr(MachineInstr &MI,
1409 MachineBasicBlock *BB) const {
1410 MachineFunction *F = BB->getParent();
1411 MachineRegisterInfo &RI = F->getRegInfo();
1412 DebugLoc dl = MI.getDebugLoc();
1413 const TargetInstrInfo &TII = *F->getSubtarget().getInstrInfo();
1416 bool ClearCarry = false;
1417 const TargetRegisterClass * RC;
1418 switch (MI.getOpcode()) {
1419 default: llvm_unreachable("Invalid shift opcode!");
1421 Opc = MSP430::ADD8rr;
1422 RC = &MSP430::GR8RegClass;
1425 Opc = MSP430::ADD16rr;
1426 RC = &MSP430::GR16RegClass;
1429 Opc = MSP430::RRA8r;
1430 RC = &MSP430::GR8RegClass;
1433 Opc = MSP430::RRA16r;
1434 RC = &MSP430::GR16RegClass;
1438 Opc = MSP430::RRC8r;
1439 RC = &MSP430::GR8RegClass;
1443 Opc = MSP430::RRC16r;
1444 RC = &MSP430::GR16RegClass;
1447 case MSP430::Rrcl16: {
1448 BuildMI(*BB, MI, dl, TII.get(MSP430::BIC16rc), MSP430::SR)
1449 .addReg(MSP430::SR).addImm(1);
1450 unsigned SrcReg = MI.getOperand(1).getReg();
1451 unsigned DstReg = MI.getOperand(0).getReg();
1452 unsigned RrcOpc = MI.getOpcode() == MSP430::Rrcl16
1453 ? MSP430::RRC16r : MSP430::RRC8r;
1454 BuildMI(*BB, MI, dl, TII.get(RrcOpc), DstReg)
1456 MI.eraseFromParent(); // The pseudo instruction is gone now.
1461 const BasicBlock *LLVM_BB = BB->getBasicBlock();
1462 MachineFunction::iterator I = ++BB->getIterator();
1464 // Create loop block
1465 MachineBasicBlock *LoopBB = F->CreateMachineBasicBlock(LLVM_BB);
1466 MachineBasicBlock *RemBB = F->CreateMachineBasicBlock(LLVM_BB);
1468 F->insert(I, LoopBB);
1469 F->insert(I, RemBB);
1471 // Update machine-CFG edges by transferring all successors of the current
1472 // block to the block containing instructions after shift.
1473 RemBB->splice(RemBB->begin(), BB, std::next(MachineBasicBlock::iterator(MI)),
1475 RemBB->transferSuccessorsAndUpdatePHIs(BB);
1477 // Add edges BB => LoopBB => RemBB, BB => RemBB, LoopBB => LoopBB
1478 BB->addSuccessor(LoopBB);
1479 BB->addSuccessor(RemBB);
1480 LoopBB->addSuccessor(RemBB);
1481 LoopBB->addSuccessor(LoopBB);
1483 unsigned ShiftAmtReg = RI.createVirtualRegister(&MSP430::GR8RegClass);
1484 unsigned ShiftAmtReg2 = RI.createVirtualRegister(&MSP430::GR8RegClass);
1485 unsigned ShiftReg = RI.createVirtualRegister(RC);
1486 unsigned ShiftReg2 = RI.createVirtualRegister(RC);
1487 unsigned ShiftAmtSrcReg = MI.getOperand(2).getReg();
1488 unsigned SrcReg = MI.getOperand(1).getReg();
1489 unsigned DstReg = MI.getOperand(0).getReg();
1494 BuildMI(BB, dl, TII.get(MSP430::CMP8ri))
1495 .addReg(ShiftAmtSrcReg).addImm(0);
1496 BuildMI(BB, dl, TII.get(MSP430::JCC))
1498 .addImm(MSP430CC::COND_E);
1501 // ShiftReg = phi [%SrcReg, BB], [%ShiftReg2, LoopBB]
1502 // ShiftAmt = phi [%N, BB], [%ShiftAmt2, LoopBB]
1503 // ShiftReg2 = shift ShiftReg
1504 // ShiftAmt2 = ShiftAmt - 1;
1505 BuildMI(LoopBB, dl, TII.get(MSP430::PHI), ShiftReg)
1506 .addReg(SrcReg).addMBB(BB)
1507 .addReg(ShiftReg2).addMBB(LoopBB);
1508 BuildMI(LoopBB, dl, TII.get(MSP430::PHI), ShiftAmtReg)
1509 .addReg(ShiftAmtSrcReg).addMBB(BB)
1510 .addReg(ShiftAmtReg2).addMBB(LoopBB);
1512 BuildMI(LoopBB, dl, TII.get(MSP430::BIC16rc), MSP430::SR)
1513 .addReg(MSP430::SR).addImm(1);
1514 if (Opc == MSP430::ADD8rr || Opc == MSP430::ADD16rr)
1515 BuildMI(LoopBB, dl, TII.get(Opc), ShiftReg2)
1519 BuildMI(LoopBB, dl, TII.get(Opc), ShiftReg2)
1521 BuildMI(LoopBB, dl, TII.get(MSP430::SUB8ri), ShiftAmtReg2)
1522 .addReg(ShiftAmtReg).addImm(1);
1523 BuildMI(LoopBB, dl, TII.get(MSP430::JCC))
1525 .addImm(MSP430CC::COND_NE);
1528 // DestReg = phi [%SrcReg, BB], [%ShiftReg, LoopBB]
1529 BuildMI(*RemBB, RemBB->begin(), dl, TII.get(MSP430::PHI), DstReg)
1530 .addReg(SrcReg).addMBB(BB)
1531 .addReg(ShiftReg2).addMBB(LoopBB);
1533 MI.eraseFromParent(); // The pseudo instruction is gone now.
1538 MSP430TargetLowering::EmitInstrWithCustomInserter(MachineInstr &MI,
1539 MachineBasicBlock *BB) const {
1540 unsigned Opc = MI.getOpcode();
1542 if (Opc == MSP430::Shl8 || Opc == MSP430::Shl16 ||
1543 Opc == MSP430::Sra8 || Opc == MSP430::Sra16 ||
1544 Opc == MSP430::Srl8 || Opc == MSP430::Srl16 ||
1545 Opc == MSP430::Rrcl8 || Opc == MSP430::Rrcl16)
1546 return EmitShiftInstr(MI, BB);
1548 const TargetInstrInfo &TII = *BB->getParent()->getSubtarget().getInstrInfo();
1549 DebugLoc dl = MI.getDebugLoc();
1551 assert((Opc == MSP430::Select16 || Opc == MSP430::Select8) &&
1552 "Unexpected instr type to insert");
1554 // To "insert" a SELECT instruction, we actually have to insert the diamond
1555 // control-flow pattern. The incoming instruction knows the destination vreg
1556 // to set, the condition code register to branch on, the true/false values to
1557 // select between, and a branch opcode to use.
1558 const BasicBlock *LLVM_BB = BB->getBasicBlock();
1559 MachineFunction::iterator I = ++BB->getIterator();
1564 // cmpTY ccX, r1, r2
1566 // fallthrough --> copy0MBB
1567 MachineBasicBlock *thisMBB = BB;
1568 MachineFunction *F = BB->getParent();
1569 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
1570 MachineBasicBlock *copy1MBB = F->CreateMachineBasicBlock(LLVM_BB);
1571 F->insert(I, copy0MBB);
1572 F->insert(I, copy1MBB);
1573 // Update machine-CFG edges by transferring all successors of the current
1574 // block to the new block which will contain the Phi node for the select.
1575 copy1MBB->splice(copy1MBB->begin(), BB,
1576 std::next(MachineBasicBlock::iterator(MI)), BB->end());
1577 copy1MBB->transferSuccessorsAndUpdatePHIs(BB);
1578 // Next, add the true and fallthrough blocks as its successors.
1579 BB->addSuccessor(copy0MBB);
1580 BB->addSuccessor(copy1MBB);
1582 BuildMI(BB, dl, TII.get(MSP430::JCC))
1584 .addImm(MI.getOperand(3).getImm());
1587 // %FalseValue = ...
1588 // # fallthrough to copy1MBB
1591 // Update machine-CFG edges
1592 BB->addSuccessor(copy1MBB);
1595 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
1598 BuildMI(*BB, BB->begin(), dl, TII.get(MSP430::PHI), MI.getOperand(0).getReg())
1599 .addReg(MI.getOperand(2).getReg())
1601 .addReg(MI.getOperand(1).getReg())
1604 MI.eraseFromParent(); // The pseudo instruction is gone now.