LLVM  9.0.0svn
MipsSubtarget.h
Go to the documentation of this file.
1 //===-- MipsSubtarget.h - Define Subtarget for the Mips ---------*- C++ -*-===//
2 //
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
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file declares the Mips specific subclass of TargetSubtargetInfo.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_LIB_TARGET_MIPS_MIPSSUBTARGET_H
14 #define LLVM_LIB_TARGET_MIPS_MIPSSUBTARGET_H
15 
17 #include "MipsFrameLowering.h"
18 #include "MipsISelLowering.h"
19 #include "MipsInstrInfo.h"
26 #include "llvm/IR/DataLayout.h"
29 #include <string>
30 
31 #define GET_SUBTARGETINFO_HEADER
32 #include "MipsGenSubtargetInfo.inc"
33 
34 namespace llvm {
35 class StringRef;
36 
37 class MipsTargetMachine;
38 
40  virtual void anchor();
41 
42  enum MipsArchEnum {
43  MipsDefault,
44  Mips1, Mips2, Mips32, Mips32r2, Mips32r3, Mips32r5, Mips32r6, Mips32Max,
45  Mips3, Mips4, Mips5, Mips64, Mips64r2, Mips64r3, Mips64r5, Mips64r6
46  };
47 
48  enum class CPU { P5600 };
49 
50  // Used to avoid printing dsp warnings multiple times.
51  static bool DspWarningPrinted;
52 
53  // Used to avoid printing msa warnings multiple times.
54  static bool MSAWarningPrinted;
55 
56  // Used to avoid printing crc warnings multiple times.
57  static bool CRCWarningPrinted;
58 
59  // Used to avoid printing ginv warnings multiple times.
60  static bool GINVWarningPrinted;
61 
62  // Used to avoid printing virt warnings multiple times.
63  static bool VirtWarningPrinted;
64 
65  // Mips architecture version
66  MipsArchEnum MipsArchVersion;
67 
68  // Processor implementation (unused but required to exist by
69  // tablegen-erated code).
70  CPU ProcImpl;
71 
72  // IsLittle - The target is Little Endian
73  bool IsLittle;
74 
75  // IsSoftFloat - The target does not support any floating point instructions.
76  bool IsSoftFloat;
77 
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.
81  bool IsSingleFloat;
82 
83  // IsFPXX - MIPS O32 modeless ABI.
84  bool IsFPXX;
85 
86  // NoABICalls - Disable SVR4-style position-independent code.
87  bool NoABICalls;
88 
89  // Abs2008 - Use IEEE 754-2008 abs.fmt instruction.
90  bool Abs2008;
91 
92  // IsFP64bit - The target processor has 64-bit floating point registers.
93  bool IsFP64bit;
94 
95  /// Are odd single-precision registers permitted?
96  /// This corresponds to -modd-spreg and -mno-odd-spreg
97  bool UseOddSPReg;
98 
99  // IsNan2008 - IEEE 754-2008 NaN encoding.
100  bool IsNaN2008bit;
101 
102  // IsGP64bit - General-purpose registers are 64 bits wide
103  bool IsGP64bit;
104 
105  // IsPTR64bit - Pointers are 64 bit wide
106  bool IsPTR64bit;
107 
108  // HasVFPU - Processor has a vector floating point unit.
109  bool HasVFPU;
110 
111  // CPU supports cnMIPS (Cavium Networks Octeon CPU).
112  bool HasCnMips;
113 
114  // isLinux - Target system is Linux. Is false we consider ELFOS for now.
115  bool IsLinux;
116 
117  // UseSmallSection - Small section is used.
118  bool UseSmallSection;
119 
120  /// Features related to the presence of specific instructions.
121 
122  // HasMips3_32 - The subset of MIPS-III instructions added to MIPS32
123  bool HasMips3_32;
124 
125  // HasMips3_32r2 - The subset of MIPS-III instructions added to MIPS32r2
126  bool HasMips3_32r2;
127 
128  // HasMips4_32 - Has the subset of MIPS-IV present in MIPS32
129  bool HasMips4_32;
130 
131  // HasMips4_32r2 - Has the subset of MIPS-IV present in MIPS32r2
132  bool HasMips4_32r2;
133 
134  // HasMips5_32r2 - Has the subset of MIPS-V present in MIPS32r2
135  bool HasMips5_32r2;
136 
137  // InMips16 -- can process Mips16 instructions
138  bool InMips16Mode;
139 
140  // Mips16 hard float
141  bool InMips16HardFloat;
142 
143  // InMicroMips -- can process MicroMips instructions
144  bool InMicroMipsMode;
145 
146  // HasDSP, HasDSPR2, HasDSPR3 -- supports DSP ASE.
147  bool HasDSP, HasDSPR2, HasDSPR3;
148 
149  // Allow mixed Mips16 and Mips32 in one source file
150  bool AllowMixed16_32;
151 
152  // Optimize for space by compiling all functions as Mips 16 unless
153  // it needs floating point. Functions needing floating point are
154  // compiled as Mips32
155  bool Os16;
156 
157  // HasMSA -- supports MSA ASE.
158  bool HasMSA;
159 
160  // UseTCCInDIV -- Enables the use of trapping in the assembler.
161  bool UseTCCInDIV;
162 
163  // Sym32 -- On Mips64 symbols are 32 bits.
164  bool HasSym32;
165 
166  // HasEVA -- supports EVA ASE.
167  bool HasEVA;
168 
169  // nomadd4 - disables generation of 4-operand madd.s, madd.d and
170  // related instructions.
171  bool DisableMadd4;
172 
173  // HasMT -- support MT ASE.
174  bool HasMT;
175 
176  // HasCRC -- supports R6 CRC ASE
177  bool HasCRC;
178 
179  // HasVirt -- supports Virtualization ASE
180  bool HasVirt;
181 
182  // HasGINV -- supports R6 Global INValidate ASE
183  bool HasGINV;
184 
185  // Use hazard variants of the jump register instructions for indirect
186  // function calls and jump tables.
187  bool UseIndirectJumpsHazard;
188 
189  // Disable use of the `jal` instruction.
190  bool UseLongCalls = false;
191 
192  /// The minimum alignment known to hold of the stack frame on
193  /// entry to the function and which must be maintained by every function.
194  unsigned stackAlignment;
195 
196  /// The overridden stack alignment.
197  unsigned StackAlignOverride;
198 
199  InstrItineraryData InstrItins;
200 
201  // We can override the determination of whether we are in mips16 mode
202  // as from the command line
203  enum {NoOverride, Mips16Override, NoMips16Override} OverrideMode;
204 
205  const MipsTargetMachine &TM;
206 
207  Triple TargetTriple;
208 
209  const SelectionDAGTargetInfo TSInfo;
210  std::unique_ptr<const MipsInstrInfo> InstrInfo;
211  std::unique_ptr<const MipsFrameLowering> FrameLowering;
212  std::unique_ptr<const MipsTargetLowering> TLInfo;
213 
214 public:
215  bool isPositionIndependent() const;
216  /// This overrides the PostRAScheduler bit in the SchedModel for each CPU.
217  bool enablePostRAScheduler() const override;
218  void getCriticalPathRCs(RegClassVector &CriticalPathRCs) const override;
220 
221  bool isABI_N64() const;
222  bool isABI_N32() const;
223  bool isABI_O32() const;
224  const MipsABIInfo &getABI() const;
225  bool isABI_FPXX() const { return isABI_O32() && IsFPXX; }
226 
227  /// This constructor initializes the data members to match that
228  /// of the specified triple.
229  MipsSubtarget(const Triple &TT, StringRef CPU, StringRef FS, bool little,
230  const MipsTargetMachine &TM, unsigned StackAlignOverride);
231 
232  /// ParseSubtargetFeatures - Parses features string setting specified
233  /// subtarget options. Definition of function is auto generated by tblgen.
235 
236  bool hasMips1() const { return MipsArchVersion >= Mips1; }
237  bool hasMips2() const { return MipsArchVersion >= Mips2; }
238  bool hasMips3() const { return MipsArchVersion >= Mips3; }
239  bool hasMips4() const { return MipsArchVersion >= Mips4; }
240  bool hasMips5() const { return MipsArchVersion >= Mips5; }
241  bool hasMips4_32() const { return HasMips4_32; }
242  bool hasMips4_32r2() const { return HasMips4_32r2; }
243  bool hasMips32() const {
244  return (MipsArchVersion >= Mips32 && MipsArchVersion < Mips32Max) ||
245  hasMips64();
246  }
247  bool hasMips32r2() const {
248  return (MipsArchVersion >= Mips32r2 && MipsArchVersion < Mips32Max) ||
249  hasMips64r2();
250  }
251  bool hasMips32r3() const {
252  return (MipsArchVersion >= Mips32r3 && MipsArchVersion < Mips32Max) ||
253  hasMips64r2();
254  }
255  bool hasMips32r5() const {
256  return (MipsArchVersion >= Mips32r5 && MipsArchVersion < Mips32Max) ||
257  hasMips64r5();
258  }
259  bool hasMips32r6() const {
260  return (MipsArchVersion >= Mips32r6 && MipsArchVersion < Mips32Max) ||
261  hasMips64r6();
262  }
263  bool hasMips64() const { return MipsArchVersion >= Mips64; }
264  bool hasMips64r2() const { return MipsArchVersion >= Mips64r2; }
265  bool hasMips64r3() const { return MipsArchVersion >= Mips64r3; }
266  bool hasMips64r5() const { return MipsArchVersion >= Mips64r5; }
267  bool hasMips64r6() const { return MipsArchVersion >= Mips64r6; }
268 
269  bool hasCnMips() const { return HasCnMips; }
270 
271  bool isLittle() const { return IsLittle; }
272  bool isABICalls() const { return !NoABICalls; }
273  bool isFPXX() const { return IsFPXX; }
274  bool isFP64bit() const { return IsFP64bit; }
275  bool useOddSPReg() const { return UseOddSPReg; }
276  bool noOddSPReg() const { return !UseOddSPReg; }
277  bool isNaN2008() const { return IsNaN2008bit; }
278  bool inAbs2008Mode() const { return Abs2008; }
279  bool isGP64bit() const { return IsGP64bit; }
280  bool isGP32bit() const { return !IsGP64bit; }
281  unsigned getGPRSizeInBytes() const { return isGP64bit() ? 8 : 4; }
282  bool isPTR64bit() const { return IsPTR64bit; }
283  bool isPTR32bit() const { return !IsPTR64bit; }
284  bool hasSym32() const {
285  return (HasSym32 && isABI_N64()) || isABI_N32() || isABI_O32();
286  }
287  bool isSingleFloat() const { return IsSingleFloat; }
288  bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
289  bool hasVFPU() const { return HasVFPU; }
290  bool inMips16Mode() const { return InMips16Mode; }
291  bool inMips16ModeDefault() const {
292  return InMips16Mode;
293  }
294  // Hard float for mips16 means essentially to compile as soft float
295  // but to use a runtime library for soft float that is written with
296  // native mips32 floating point instructions (those runtime routines
297  // run in mips32 hard float mode).
298  bool inMips16HardFloat() const {
299  return inMips16Mode() && InMips16HardFloat;
300  }
301  bool inMicroMipsMode() const { return InMicroMipsMode && !InMips16Mode; }
302  bool inMicroMips32r6Mode() const {
303  return inMicroMipsMode() && hasMips32r6();
304  }
305  bool hasDSP() const { return HasDSP; }
306  bool hasDSPR2() const { return HasDSPR2; }
307  bool hasDSPR3() const { return HasDSPR3; }
308  bool hasMSA() const { return HasMSA; }
309  bool disableMadd4() const { return DisableMadd4; }
310  bool hasEVA() const { return HasEVA; }
311  bool hasMT() const { return HasMT; }
312  bool hasCRC() const { return HasCRC; }
313  bool hasVirt() const { return HasVirt; }
314  bool hasGINV() const { return HasGINV; }
315  bool useIndirectJumpsHazard() const {
316  return UseIndirectJumpsHazard && hasMips32r2();
317  }
318  bool useSmallSection() const { return UseSmallSection; }
319 
320  bool hasStandardEncoding() const { return !InMips16Mode && !InMicroMipsMode; }
321 
322  bool useSoftFloat() const { return IsSoftFloat; }
323 
324  bool useLongCalls() const { return UseLongCalls; }
325 
326  bool enableLongBranchPass() const {
328  }
329 
330  /// Features related to the presence of specific instructions.
331  bool hasExtractInsert() const { return !inMips16Mode() && hasMips32r2(); }
332  bool hasMTHC1() const { return hasMips32r2(); }
333 
334  bool allowMixed16_32() const { return inMips16ModeDefault() |
335  AllowMixed16_32; }
336 
337  bool os16() const { return Os16; }
338 
339  bool isTargetNaCl() const { return TargetTriple.isOSNaCl(); }
340 
341  bool isXRaySupported() const override { return true; }
342 
343  // for now constant islands are on for the whole compilation unit but we only
344  // really use them if in addition we are in mips16 mode
345  static bool useConstantIslands();
346 
347  unsigned getStackAlignment() const { return stackAlignment; }
348 
349  // Grab relocation model
351 
353  const TargetMachine &TM);
354 
355  /// Does the system support unaligned memory access.
356  ///
357  /// MIPS32r6/MIPS64r6 require full unaligned access support but does not
358  /// specify which component of the system provides it. Hardware, software, and
359  /// hybrid implementations are all valid.
360  bool systemSupportsUnalignedAccess() const { return hasMips32r6(); }
361 
362  // Set helper classes
363  void setHelperClassesMips16();
364  void setHelperClassesMipsSE();
365 
366  const SelectionDAGTargetInfo *getSelectionDAGInfo() const override {
367  return &TSInfo;
368  }
369  const MipsInstrInfo *getInstrInfo() const override { return InstrInfo.get(); }
370  const TargetFrameLowering *getFrameLowering() const override {
371  return FrameLowering.get();
372  }
373  const MipsRegisterInfo *getRegisterInfo() const override {
374  return &InstrInfo->getRegisterInfo();
375  }
376  const MipsTargetLowering *getTargetLowering() const override {
377  return TLInfo.get();
378  }
379  const InstrItineraryData *getInstrItineraryData() const override {
380  return &InstrItins;
381  }
382 
383 protected:
384  // GlobalISel related APIs.
385  std::unique_ptr<CallLowering> CallLoweringInfo;
386  std::unique_ptr<LegalizerInfo> Legalizer;
387  std::unique_ptr<RegisterBankInfo> RegBankInfo;
388  std::unique_ptr<InstructionSelector> InstSelector;
389 
390 public:
391  const CallLowering *getCallLowering() const override;
392  const LegalizerInfo *getLegalizerInfo() const override;
393  const RegisterBankInfo *getRegBankInfo() const override;
394  const InstructionSelector *getInstructionSelector() const override;
395 };
396 } // End llvm namespace
397 
398 #endif
const RegisterBankInfo * getRegBankInfo() const override
bool isABI_FPXX() const
bool isABICalls() const
bool inMips16HardFloat() const
bool isPTR64bit() const
bool hasVFPU() const
bool inMips16ModeDefault() const
std::unique_ptr< InstructionSelector > InstSelector
bool hasMTHC1() const
bool hasMips3() const
This class represents lattice values for constants.
Definition: AllocatorList.h:23
bool inMips16Mode() const
bool isOSBinFormatELF() const
Tests whether the OS uses the ELF binary format.
Definition: Triple.h:623
MipsSubtarget(const Triple &TT, StringRef CPU, StringRef FS, bool little, const MipsTargetMachine &TM, unsigned StackAlignOverride)
This constructor initializes the data members to match that of the specified triple.
bool hasMips2() const
void setHelperClassesMips16()
void getCriticalPathRCs(RegClassVector &CriticalPathRCs) const override
bool isOSNaCl() const
Tests whether the OS is NaCl (Native Client)
Definition: Triple.h:581
const MipsInstrInfo * getInstrInfo() const override
const InstrItineraryData * getInstrItineraryData() const override
bool isABI_O32() const
bool hasMips4_32() const
bool hasExtractInsert() const
Features related to the presence of specific instructions.
bool enableLongBranchPass() const
const InstructionSelector * getInstructionSelector() const override
bool isFPXX() const
bool hasMips64() const
bool hasDSPR3() const
bool hasDSPR2() const
Holds all the information related to register banks.
bool hasSym32() const
bool inMicroMipsMode() const
bool isXRaySupported() const override
bool hasStandardEncoding() const
bool useIndirectJumpsHazard() const
bool hasMips4_32r2() const
bool isGP64bit() const
bool hasMips32r6() const
bool hasMips1() const
bool hasMips64r3() const
Itinerary data supplied by a subtarget to be used by a target.
bool useSmallSection() const
bool isPTR32bit() const
bool hasMips32r5() const
bool isTargetNaCl() const
const TargetFrameLowering * getFrameLowering() const override
unsigned getGPRSizeInBytes() const
unsigned getStackAlignment() const
bool hasCRC() const
const LegalizerInfo * getLegalizerInfo() const override
bool useLongCalls() const
std::unique_ptr< RegisterBankInfo > RegBankInfo
bool hasMips64r2() const
bool hasMips32r3() const
Targets can subclass this to parameterize the SelectionDAG lowering and instruction selection process...
bool isSingleFloat() const
bool hasMips64r6() const
const MipsABIInfo & getABI() const
bool isABI_N32() const
bool isNaN2008() const
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:43
std::unique_ptr< CallLowering > CallLoweringInfo
bool hasMips64r5() const
bool hasMT() const
static bool useConstantIslands()
const SelectionDAGTargetInfo * getSelectionDAGInfo() const override
bool hasEVA() const
bool isLittle() const
const MipsRegisterInfo * getRegisterInfo() const override
bool isPositionIndependent() const
bool enablePostRAScheduler() const override
This overrides the PostRAScheduler bit in the SchedModel for each CPU.
bool hasCnMips() const
void setHelperClassesMipsSE()
Information about stack frame layout on the target.
bool inAbs2008Mode() const
bool hasMips5() const
bool hasDSP() const
const CallLowering * getCallLowering() const override
const MipsTargetLowering * getTargetLowering() const override
bool hasVirt() const
bool isTargetELF() const
bool hasMips4() const
Provides the logic to select generic machine instructions.
bool hasGINV() const
bool noOddSPReg() const
bool hasMips32() const
bool useOddSPReg() const
bool hasMips32r2() const
bool isABI_N64() const
bool allowMixed16_32() const
CodeGenOpt::Level getOptLevelToEnablePostRAScheduler() const override
Reloc::Model getRelocationModel() const
bool isGP32bit() const
void ParseSubtargetFeatures(StringRef CPU, StringRef FS)
ParseSubtargetFeatures - Parses features string setting specified subtarget options.
This file describes how to lower LLVM calls to machine code calls.
MipsSubtarget & initializeSubtargetDependencies(StringRef CPU, StringRef FS, const TargetMachine &TM)
bool useSoftFloat() const
Primary interface to the complete machine description for the target machine.
Definition: TargetMachine.h:65
bool inMicroMips32r6Mode() const
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48
bool systemSupportsUnalignedAccess() const
Does the system support unaligned memory access.
bool isFP64bit() const
bool disableMadd4() const
bool hasMSA() const
std::unique_ptr< LegalizerInfo > Legalizer