1 //===-- MipsSubtarget.h - Define Subtarget for the Mips ---------*- C++ -*-===//
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //===----------------------------------------------------------------------===//
9 // This file declares the Mips specific subclass of TargetSubtargetInfo.
11 //===----------------------------------------------------------------------===//
13 #ifndef LLVM_LIB_TARGET_MIPS_MIPSSUBTARGET_H
14 #define LLVM_LIB_TARGET_MIPS_MIPSSUBTARGET_H
16 #include "MCTargetDesc/MipsABIInfo.h"
17 #include "MipsFrameLowering.h"
18 #include "MipsISelLowering.h"
19 #include "MipsInstrInfo.h"
20 #include "llvm/CodeGen/SelectionDAGTargetInfo.h"
21 #include "llvm/CodeGen/TargetSubtargetInfo.h"
22 #include "llvm/CodeGen/GlobalISel/CallLowering.h"
23 #include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
24 #include "llvm/CodeGen/GlobalISel/RegisterBankInfo.h"
25 #include "llvm/CodeGen/GlobalISel/InstructionSelector.h"
26 #include "llvm/IR/DataLayout.h"
27 #include "llvm/MC/MCInstrItineraries.h"
28 #include "llvm/Support/ErrorHandling.h"
31 #define GET_SUBTARGETINFO_HEADER
32 #include "MipsGenSubtargetInfo.inc"
37 class MipsTargetMachine;
39 class MipsSubtarget : public MipsGenSubtargetInfo {
40 virtual void anchor();
44 Mips1, Mips2, Mips32, Mips32r2, Mips32r3, Mips32r5, Mips32r6, Mips32Max,
45 Mips3, Mips4, Mips5, Mips64, Mips64r2, Mips64r3, Mips64r5, Mips64r6
48 enum class CPU { P5600 };
50 // Used to avoid printing dsp warnings multiple times.
51 static bool DspWarningPrinted;
53 // Used to avoid printing msa warnings multiple times.
54 static bool MSAWarningPrinted;
56 // Used to avoid printing crc warnings multiple times.
57 static bool CRCWarningPrinted;
59 // Used to avoid printing ginv warnings multiple times.
60 static bool GINVWarningPrinted;
62 // Used to avoid printing virt warnings multiple times.
63 static bool VirtWarningPrinted;
65 // Mips architecture version
66 MipsArchEnum MipsArchVersion;
68 // Processor implementation (unused but required to exist by
69 // tablegen-erated code).
72 // IsLittle - The target is Little Endian
75 // IsSoftFloat - The target does not support any floating point instructions.
78 // IsSingleFloat - The target only supports single precision float
79 // point operations. This enable the target to use all 32 32-bit
80 // floating point registers instead of only using even ones.
83 // IsFPXX - MIPS O32 modeless ABI.
86 // NoABICalls - Disable SVR4-style position-independent code.
89 // Abs2008 - Use IEEE 754-2008 abs.fmt instruction.
92 // IsFP64bit - The target processor has 64-bit floating point registers.
95 /// Are odd single-precision registers permitted?
96 /// This corresponds to -modd-spreg and -mno-odd-spreg
99 // IsNan2008 - IEEE 754-2008 NaN encoding.
102 // IsGP64bit - General-purpose registers are 64 bits wide
105 // IsPTR64bit - Pointers are 64 bit wide
108 // HasVFPU - Processor has a vector floating point unit.
111 // CPU supports cnMIPS (Cavium Networks Octeon CPU).
114 // CPU supports cnMIPSP (Cavium Networks Octeon+ CPU).
117 // isLinux - Target system is Linux. Is false we consider ELFOS for now.
120 // UseSmallSection - Small section is used.
121 bool UseSmallSection;
123 /// Features related to the presence of specific instructions.
125 // HasMips3_32 - The subset of MIPS-III instructions added to MIPS32
128 // HasMips3_32r2 - The subset of MIPS-III instructions added to MIPS32r2
131 // HasMips4_32 - Has the subset of MIPS-IV present in MIPS32
134 // HasMips4_32r2 - Has the subset of MIPS-IV present in MIPS32r2
137 // HasMips5_32r2 - Has the subset of MIPS-V present in MIPS32r2
140 // InMips16 -- can process Mips16 instructions
144 bool InMips16HardFloat;
146 // InMicroMips -- can process MicroMips instructions
147 bool InMicroMipsMode;
149 // HasDSP, HasDSPR2, HasDSPR3 -- supports DSP ASE.
150 bool HasDSP, HasDSPR2, HasDSPR3;
152 // Allow mixed Mips16 and Mips32 in one source file
153 bool AllowMixed16_32;
155 // Optimize for space by compiling all functions as Mips 16 unless
156 // it needs floating point. Functions needing floating point are
157 // compiled as Mips32
160 // HasMSA -- supports MSA ASE.
163 // UseTCCInDIV -- Enables the use of trapping in the assembler.
166 // Sym32 -- On Mips64 symbols are 32 bits.
169 // HasEVA -- supports EVA ASE.
172 // nomadd4 - disables generation of 4-operand madd.s, madd.d and
173 // related instructions.
176 // HasMT -- support MT ASE.
179 // HasCRC -- supports R6 CRC ASE
182 // HasVirt -- supports Virtualization ASE
185 // HasGINV -- supports R6 Global INValidate ASE
188 // Use hazard variants of the jump register instructions for indirect
189 // function calls and jump tables.
190 bool UseIndirectJumpsHazard;
192 // Disable use of the `jal` instruction.
193 bool UseLongCalls = false;
195 // Assume 32-bit GOT.
196 bool UseXGOT = false;
198 /// The minimum alignment known to hold of the stack frame on
199 /// entry to the function and which must be maintained by every function.
200 Align stackAlignment;
202 /// The overridden stack alignment.
203 MaybeAlign StackAlignOverride;
205 InstrItineraryData InstrItins;
207 // We can override the determination of whether we are in mips16 mode
208 // as from the command line
209 enum {NoOverride, Mips16Override, NoMips16Override} OverrideMode;
211 const MipsTargetMachine &TM;
215 const SelectionDAGTargetInfo TSInfo;
216 std::unique_ptr<const MipsInstrInfo> InstrInfo;
217 std::unique_ptr<const MipsFrameLowering> FrameLowering;
218 std::unique_ptr<const MipsTargetLowering> TLInfo;
221 bool isPositionIndependent() const;
222 /// This overrides the PostRAScheduler bit in the SchedModel for each CPU.
223 bool enablePostRAScheduler() const override;
224 void getCriticalPathRCs(RegClassVector &CriticalPathRCs) const override;
225 CodeGenOpt::Level getOptLevelToEnablePostRAScheduler() const override;
227 bool isABI_N64() const;
228 bool isABI_N32() const;
229 bool isABI_O32() const;
230 const MipsABIInfo &getABI() const;
231 bool isABI_FPXX() const { return isABI_O32() && IsFPXX; }
233 /// This constructor initializes the data members to match that
234 /// of the specified triple.
235 MipsSubtarget(const Triple &TT, StringRef CPU, StringRef FS, bool little,
236 const MipsTargetMachine &TM, MaybeAlign StackAlignOverride);
238 /// ParseSubtargetFeatures - Parses features string setting specified
239 /// subtarget options. Definition of function is auto generated by tblgen.
240 void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
242 bool hasMips1() const { return MipsArchVersion >= Mips1; }
243 bool hasMips2() const { return MipsArchVersion >= Mips2; }
244 bool hasMips3() const { return MipsArchVersion >= Mips3; }
245 bool hasMips4() const { return MipsArchVersion >= Mips4; }
246 bool hasMips5() const { return MipsArchVersion >= Mips5; }
247 bool hasMips4_32() const { return HasMips4_32; }
248 bool hasMips4_32r2() const { return HasMips4_32r2; }
249 bool hasMips32() const {
250 return (MipsArchVersion >= Mips32 && MipsArchVersion < Mips32Max) ||
253 bool hasMips32r2() const {
254 return (MipsArchVersion >= Mips32r2 && MipsArchVersion < Mips32Max) ||
257 bool hasMips32r3() const {
258 return (MipsArchVersion >= Mips32r3 && MipsArchVersion < Mips32Max) ||
261 bool hasMips32r5() const {
262 return (MipsArchVersion >= Mips32r5 && MipsArchVersion < Mips32Max) ||
265 bool hasMips32r6() const {
266 return (MipsArchVersion >= Mips32r6 && MipsArchVersion < Mips32Max) ||
269 bool hasMips64() const { return MipsArchVersion >= Mips64; }
270 bool hasMips64r2() const { return MipsArchVersion >= Mips64r2; }
271 bool hasMips64r3() const { return MipsArchVersion >= Mips64r3; }
272 bool hasMips64r5() const { return MipsArchVersion >= Mips64r5; }
273 bool hasMips64r6() const { return MipsArchVersion >= Mips64r6; }
275 bool hasCnMips() const { return HasCnMips; }
276 bool hasCnMipsP() const { return HasCnMipsP; }
278 bool isLittle() const { return IsLittle; }
279 bool isABICalls() const { return !NoABICalls; }
280 bool isFPXX() const { return IsFPXX; }
281 bool isFP64bit() const { return IsFP64bit; }
282 bool useOddSPReg() const { return UseOddSPReg; }
283 bool noOddSPReg() const { return !UseOddSPReg; }
284 bool isNaN2008() const { return IsNaN2008bit; }
285 bool inAbs2008Mode() const { return Abs2008; }
286 bool isGP64bit() const { return IsGP64bit; }
287 bool isGP32bit() const { return !IsGP64bit; }
288 unsigned getGPRSizeInBytes() const { return isGP64bit() ? 8 : 4; }
289 bool isPTR64bit() const { return IsPTR64bit; }
290 bool isPTR32bit() const { return !IsPTR64bit; }
291 bool hasSym32() const {
292 return (HasSym32 && isABI_N64()) || isABI_N32() || isABI_O32();
294 bool isSingleFloat() const { return IsSingleFloat; }
295 bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
296 bool hasVFPU() const { return HasVFPU; }
297 bool inMips16Mode() const { return InMips16Mode; }
298 bool inMips16ModeDefault() const {
301 // Hard float for mips16 means essentially to compile as soft float
302 // but to use a runtime library for soft float that is written with
303 // native mips32 floating point instructions (those runtime routines
304 // run in mips32 hard float mode).
305 bool inMips16HardFloat() const {
306 return inMips16Mode() && InMips16HardFloat;
308 bool inMicroMipsMode() const { return InMicroMipsMode && !InMips16Mode; }
309 bool inMicroMips32r6Mode() const {
310 return inMicroMipsMode() && hasMips32r6();
312 bool hasDSP() const { return HasDSP; }
313 bool hasDSPR2() const { return HasDSPR2; }
314 bool hasDSPR3() const { return HasDSPR3; }
315 bool hasMSA() const { return HasMSA; }
316 bool disableMadd4() const { return DisableMadd4; }
317 bool hasEVA() const { return HasEVA; }
318 bool hasMT() const { return HasMT; }
319 bool hasCRC() const { return HasCRC; }
320 bool hasVirt() const { return HasVirt; }
321 bool hasGINV() const { return HasGINV; }
322 bool useIndirectJumpsHazard() const {
323 return UseIndirectJumpsHazard && hasMips32r2();
325 bool useSmallSection() const { return UseSmallSection; }
327 bool hasStandardEncoding() const { return !InMips16Mode && !InMicroMipsMode; }
329 bool useSoftFloat() const { return IsSoftFloat; }
331 bool useLongCalls() const { return UseLongCalls; }
333 bool useXGOT() const { return UseXGOT; }
335 bool enableLongBranchPass() const {
336 return hasStandardEncoding() || inMicroMipsMode() || allowMixed16_32();
339 /// Features related to the presence of specific instructions.
340 bool hasExtractInsert() const { return !inMips16Mode() && hasMips32r2(); }
341 bool hasMTHC1() const { return hasMips32r2(); }
343 bool allowMixed16_32() const { return inMips16ModeDefault() |
346 bool os16() const { return Os16; }
348 bool isTargetNaCl() const { return TargetTriple.isOSNaCl(); }
350 bool isXRaySupported() const override { return true; }
352 // for now constant islands are on for the whole compilation unit but we only
353 // really use them if in addition we are in mips16 mode
354 static bool useConstantIslands();
356 Align getStackAlignment() const { return stackAlignment; }
358 // Grab relocation model
359 Reloc::Model getRelocationModel() const;
361 MipsSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS,
362 const TargetMachine &TM);
364 /// Does the system support unaligned memory access.
366 /// MIPS32r6/MIPS64r6 require full unaligned access support but does not
367 /// specify which component of the system provides it. Hardware, software, and
368 /// hybrid implementations are all valid.
369 bool systemSupportsUnalignedAccess() const { return hasMips32r6(); }
371 // Set helper classes
372 void setHelperClassesMips16();
373 void setHelperClassesMipsSE();
375 const SelectionDAGTargetInfo *getSelectionDAGInfo() const override {
378 const MipsInstrInfo *getInstrInfo() const override { return InstrInfo.get(); }
379 const TargetFrameLowering *getFrameLowering() const override {
380 return FrameLowering.get();
382 const MipsRegisterInfo *getRegisterInfo() const override {
383 return &InstrInfo->getRegisterInfo();
385 const MipsTargetLowering *getTargetLowering() const override {
388 const InstrItineraryData *getInstrItineraryData() const override {
393 // GlobalISel related APIs.
394 std::unique_ptr<CallLowering> CallLoweringInfo;
395 std::unique_ptr<LegalizerInfo> Legalizer;
396 std::unique_ptr<RegisterBankInfo> RegBankInfo;
397 std::unique_ptr<InstructionSelector> InstSelector;
400 const CallLowering *getCallLowering() const override;
401 const LegalizerInfo *getLegalizerInfo() const override;
402 const RegisterBankInfo *getRegBankInfo() const override;
403 InstructionSelector *getInstructionSelector() const override;
405 } // End llvm namespace