lib/Target/X86/X86Subtarget.h

   1 //===-- X86Subtarget.h - Define Subtarget for the X86 ----------*- 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 X86 specific subclass of TargetSubtargetInfo.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #ifndef LLVM_LIB_TARGET_X86_X86SUBTARGET_H
  14 #define LLVM_LIB_TARGET_X86_X86SUBTARGET_H
  15
  16 #include "X86FrameLowering.h"
  17 #include "X86ISelLowering.h"
  18 #include "X86InstrInfo.h"
  19 #include "X86SelectionDAGInfo.h"
  20 #include "llvm/ADT/StringRef.h"
  21 #include "llvm/ADT/Triple.h"
  22 #include "llvm/CodeGen/GlobalISel/CallLowering.h"
  23 #include "llvm/CodeGen/GlobalISel/InstructionSelector.h"
  24 #include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
  25 #include "llvm/CodeGen/GlobalISel/RegisterBankInfo.h"
  26 #include "llvm/CodeGen/TargetSubtargetInfo.h"
  27 #include "llvm/IR/CallingConv.h"
  28 #include "llvm/Target/TargetMachine.h"
  29 #include <climits>
  30 #include <memory>
  31
  32 #define GET_SUBTARGETINFO_HEADER
  33 #include "X86GenSubtargetInfo.inc"
  34
  35 namespace llvm {
  36
  37 class GlobalValue;
  38
  39 /// The X86 backend supports a number of different styles of PIC.
  40 ///
  41 namespace PICStyles {
  42
  43 enum Style {
  44   StubPIC,          // Used on i386-darwin in pic mode.
  45   GOT,              // Used on 32 bit elf on when in pic mode.
  46   RIPRel,           // Used on X86-64 when in pic mode.
  47   None              // Set when not in pic mode.
  48 };
  49
  50 } // end namespace PICStyles
  51
  52 class X86Subtarget final : public X86GenSubtargetInfo {
  53 public:
  54   // NOTE: Do not add anything new to this list. Coarse, CPU name based flags
  55   // are not a good idea. We should be migrating away from these.
  56   enum X86ProcFamilyEnum {
  57     Others,
  58     IntelAtom,
  59     IntelSLM,
  60     IntelGLM,
  61     IntelGLP,
  62     IntelTRM
  63   };
  64
  65 protected:
  66   enum X86SSEEnum {
  67     NoSSE, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, AVX, AVX2, AVX512F
  68   };
  69
  70   enum X863DNowEnum {
  71     NoThreeDNow, MMX, ThreeDNow, ThreeDNowA
  72   };
  73
  74   /// X86 processor family: Intel Atom, and others
  75   X86ProcFamilyEnum X86ProcFamily = Others;
  76
  77   /// Which PIC style to use
  78   PICStyles::Style PICStyle;
  79
  80   const TargetMachine &TM;
  81
  82   /// SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, or none supported.
  83   X86SSEEnum X86SSELevel = NoSSE;
  84
  85   /// MMX, 3DNow, 3DNow Athlon, or none supported.
  86   X863DNowEnum X863DNowLevel = NoThreeDNow;
  87
  88   /// True if the processor supports X87 instructions.
  89   bool HasX87 = false;
  90
  91   /// True if the processor supports CMPXCHG8B.
  92   bool HasCmpxchg8b = false;
  93
  94   /// True if this processor has NOPL instruction
  95   /// (generally pentium pro+).
  96   bool HasNOPL = false;
  97
  98   /// True if this processor has conditional move instructions
  99   /// (generally pentium pro+).
 100   bool HasCMov = false;
 101
 102   /// True if the processor supports X86-64 instructions.
 103   bool HasX86_64 = false;
 104
 105   /// True if the processor supports POPCNT.
 106   bool HasPOPCNT = false;
 107
 108   /// True if the processor supports SSE4A instructions.
 109   bool HasSSE4A = false;
 110
 111   /// Target has AES instructions
 112   bool HasAES = false;
 113   bool HasVAES = false;
 114
 115   /// Target has FXSAVE/FXRESTOR instructions
 116   bool HasFXSR = false;
 117
 118   /// Target has XSAVE instructions
 119   bool HasXSAVE = false;
 120
 121   /// Target has XSAVEOPT instructions
 122   bool HasXSAVEOPT = false;
 123
 124   /// Target has XSAVEC instructions
 125   bool HasXSAVEC = false;
 126
 127   /// Target has XSAVES instructions
 128   bool HasXSAVES = false;
 129
 130   /// Target has carry-less multiplication
 131   bool HasPCLMUL = false;
 132   bool HasVPCLMULQDQ = false;
 133
 134   /// Target has Galois Field Arithmetic instructions
 135   bool HasGFNI = false;
 136
 137   /// Target has 3-operand fused multiply-add
 138   bool HasFMA = false;
 139
 140   /// Target has 4-operand fused multiply-add
 141   bool HasFMA4 = false;
 142
 143   /// Target has XOP instructions
 144   bool HasXOP = false;
 145
 146   /// Target has TBM instructions.
 147   bool HasTBM = false;
 148
 149   /// Target has LWP instructions
 150   bool HasLWP = false;
 151
 152   /// True if the processor has the MOVBE instruction.
 153   bool HasMOVBE = false;
 154
 155   /// True if the processor has the RDRAND instruction.
 156   bool HasRDRAND = false;
 157
 158   /// Processor has 16-bit floating point conversion instructions.
 159   bool HasF16C = false;
 160
 161   /// Processor has FS/GS base insturctions.
 162   bool HasFSGSBase = false;
 163
 164   /// Processor has LZCNT instruction.
 165   bool HasLZCNT = false;
 166
 167   /// Processor has BMI1 instructions.
 168   bool HasBMI = false;
 169
 170   /// Processor has BMI2 instructions.
 171   bool HasBMI2 = false;
 172
 173   /// Processor has VBMI instructions.
 174   bool HasVBMI = false;
 175
 176   /// Processor has VBMI2 instructions.
 177   bool HasVBMI2 = false;
 178
 179   /// Processor has Integer Fused Multiply Add
 180   bool HasIFMA = false;
 181
 182   /// Processor has RTM instructions.
 183   bool HasRTM = false;
 184
 185   /// Processor has ADX instructions.
 186   bool HasADX = false;
 187
 188   /// Processor has SHA instructions.
 189   bool HasSHA = false;
 190
 191   /// Processor has PRFCHW instructions.
 192   bool HasPRFCHW = false;
 193
 194   /// Processor has RDSEED instructions.
 195   bool HasRDSEED = false;
 196
 197   /// Processor has LAHF/SAHF instructions.
 198   bool HasLAHFSAHF = false;
 199
 200   /// Processor has MONITORX/MWAITX instructions.
 201   bool HasMWAITX = false;
 202
 203   /// Processor has Cache Line Zero instruction
 204   bool HasCLZERO = false;
 205
 206   /// Processor has Cache Line Demote instruction
 207   bool HasCLDEMOTE = false;
 208
 209   /// Processor has MOVDIRI instruction (direct store integer).
 210   bool HasMOVDIRI = false;
 211
 212   /// Processor has MOVDIR64B instruction (direct store 64 bytes).
 213   bool HasMOVDIR64B = false;
 214
 215   /// Processor has ptwrite instruction.
 216   bool HasPTWRITE = false;
 217
 218   /// Processor has Prefetch with intent to Write instruction
 219   bool HasPREFETCHWT1 = false;
 220
 221   /// True if SHLD instructions are slow.
 222   bool IsSHLDSlow = false;
 223
 224   /// True if the PMULLD instruction is slow compared to PMULLW/PMULHW and
 225   //  PMULUDQ.
 226   bool IsPMULLDSlow = false;
 227
 228   /// True if the PMADDWD instruction is slow compared to PMULLD.
 229   bool IsPMADDWDSlow = false;
 230
 231   /// True if unaligned memory accesses of 16-bytes are slow.
 232   bool IsUAMem16Slow = false;
 233
 234   /// True if unaligned memory accesses of 32-bytes are slow.
 235   bool IsUAMem32Slow = false;
 236
 237   /// True if SSE operations can have unaligned memory operands.
 238   /// This may require setting a configuration bit in the processor.
 239   bool HasSSEUnalignedMem = false;
 240
 241   /// True if this processor has the CMPXCHG16B instruction;
 242   /// this is true for most x86-64 chips, but not the first AMD chips.
 243   bool HasCmpxchg16b = false;
 244
 245   /// True if the LEA instruction should be used for adjusting
 246   /// the stack pointer. This is an optimization for Intel Atom processors.
 247   bool UseLeaForSP = false;
 248
 249   /// True if POPCNT instruction has a false dependency on the destination register.
 250   bool HasPOPCNTFalseDeps = false;
 251
 252   /// True if LZCNT/TZCNT instructions have a false dependency on the destination register.
 253   bool HasLZCNTFalseDeps = false;
 254
 255   /// True if its preferable to combine to a single shuffle using a variable
 256   /// mask over multiple fixed shuffles.
 257   bool HasFastVariableShuffle = false;
 258
 259   /// True if there is no performance penalty to writing only the lower parts
 260   /// of a YMM or ZMM register without clearing the upper part.
 261   bool HasFastPartialYMMorZMMWrite = false;
 262
 263   /// True if there is no performance penalty for writing NOPs with up to
 264   /// 11 bytes.
 265   bool HasFast11ByteNOP = false;
 266
 267   /// True if there is no performance penalty for writing NOPs with up to
 268   /// 15 bytes.
 269   bool HasFast15ByteNOP = false;
 270
 271   /// True if gather is reasonably fast. This is true for Skylake client and
 272   /// all AVX-512 CPUs.
 273   bool HasFastGather = false;
 274
 275   /// True if hardware SQRTSS instruction is at least as fast (latency) as
 276   /// RSQRTSS followed by a Newton-Raphson iteration.
 277   bool HasFastScalarFSQRT = false;
 278
 279   /// True if hardware SQRTPS/VSQRTPS instructions are at least as fast
 280   /// (throughput) as RSQRTPS/VRSQRTPS followed by a Newton-Raphson iteration.
 281   bool HasFastVectorFSQRT = false;
 282
 283   /// True if 8-bit divisions are significantly faster than
 284   /// 32-bit divisions and should be used when possible.
 285   bool HasSlowDivide32 = false;
 286
 287   /// True if 32-bit divides are significantly faster than
 288   /// 64-bit divisions and should be used when possible.
 289   bool HasSlowDivide64 = false;
 290
 291   /// True if LZCNT instruction is fast.
 292   bool HasFastLZCNT = false;
 293
 294   /// True if SHLD based rotate is fast.
 295   bool HasFastSHLDRotate = false;
 296
 297   /// True if the processor supports macrofusion.
 298   bool HasMacroFusion = false;
 299
 300   /// True if the processor supports branch fusion.
 301   bool HasBranchFusion = false;
 302
 303   /// True if the processor has enhanced REP MOVSB/STOSB.
 304   bool HasERMSB = false;
 305
 306   /// True if the short functions should be padded to prevent
 307   /// a stall when returning too early.
 308   bool PadShortFunctions = false;
 309
 310   /// True if two memory operand instructions should use a temporary register
 311   /// instead.
 312   bool SlowTwoMemOps = false;
 313
 314   /// True if the LEA instruction inputs have to be ready at address generation
 315   /// (AG) time.
 316   bool LEAUsesAG = false;
 317
 318   /// True if the LEA instruction with certain arguments is slow
 319   bool SlowLEA = false;
 320
 321   /// True if the LEA instruction has all three source operands: base, index,
 322   /// and offset or if the LEA instruction uses base and index registers where
 323   /// the base is EBP, RBP,or R13
 324   bool Slow3OpsLEA = false;
 325
 326   /// True if INC and DEC instructions are slow when writing to flags
 327   bool SlowIncDec = false;
 328
 329   /// Processor has AVX-512 PreFetch Instructions
 330   bool HasPFI = false;
 331
 332   /// Processor has AVX-512 Exponential and Reciprocal Instructions
 333   bool HasERI = false;
 334
 335   /// Processor has AVX-512 Conflict Detection Instructions
 336   bool HasCDI = false;
 337
 338   /// Processor has AVX-512 population count Instructions
 339   bool HasVPOPCNTDQ = false;
 340
 341   /// Processor has AVX-512 Doubleword and Quadword instructions
 342   bool HasDQI = false;
 343
 344   /// Processor has AVX-512 Byte and Word instructions
 345   bool HasBWI = false;
 346
 347   /// Processor has AVX-512 Vector Length eXtenstions
 348   bool HasVLX = false;
 349
 350   /// Processor has PKU extenstions
 351   bool HasPKU = false;
 352
 353   /// Processor has AVX-512 Vector Neural Network Instructions
 354   bool HasVNNI = false;
 355
 356   /// Processor has AVX-512 bfloat16 floating-point extensions
 357   bool HasBF16 = false;
 358
 359   /// Processor supports ENQCMD instructions
 360   bool HasENQCMD = false;
 361
 362   /// Processor has AVX-512 Bit Algorithms instructions
 363   bool HasBITALG = false;
 364
 365   /// Processor has AVX-512 vp2intersect instructions
 366   bool HasVP2INTERSECT = false;
 367
 368   /// Deprecated flag for MPX instructions.
 369   bool DeprecatedHasMPX = false;
 370
 371   /// Processor supports CET SHSTK - Control-Flow Enforcement Technology
 372   /// using Shadow Stack
 373   bool HasSHSTK = false;
 374
 375   /// Processor supports Invalidate Process-Context Identifier
 376   bool HasINVPCID = false;
 377
 378   /// Processor has Software Guard Extensions
 379   bool HasSGX = false;
 380
 381   /// Processor supports Flush Cache Line instruction
 382   bool HasCLFLUSHOPT = false;
 383
 384   /// Processor supports Cache Line Write Back instruction
 385   bool HasCLWB = false;
 386
 387   /// Processor supports Write Back No Invalidate instruction
 388   bool HasWBNOINVD = false;
 389
 390   /// Processor support RDPID instruction
 391   bool HasRDPID = false;
 392
 393   /// Processor supports WaitPKG instructions
 394   bool HasWAITPKG = false;
 395
 396   /// Processor supports PCONFIG instruction
 397   bool HasPCONFIG = false;
 398
 399   /// Processor has a single uop BEXTR implementation.
 400   bool HasFastBEXTR = false;
 401
 402   /// Try harder to combine to horizontal vector ops if they are fast.
 403   bool HasFastHorizontalOps = false;
 404
 405   /// Prefer a left/right scalar logical shifts pair over a shift+and pair.
 406   bool HasFastScalarShiftMasks = false;
 407
 408   /// Prefer a left/right vector logical shifts pair over a shift+and pair.
 409   bool HasFastVectorShiftMasks = false;
 410
 411   /// Use a retpoline thunk rather than indirect calls to block speculative
 412   /// execution.
 413   bool UseRetpolineIndirectCalls = false;
 414
 415   /// Use a retpoline thunk or remove any indirect branch to block speculative
 416   /// execution.
 417   bool UseRetpolineIndirectBranches = false;
 418
 419   /// Deprecated flag, query `UseRetpolineIndirectCalls` and
 420   /// `UseRetpolineIndirectBranches` instead.
 421   bool DeprecatedUseRetpoline = false;
 422
 423   /// When using a retpoline thunk, call an externally provided thunk rather
 424   /// than emitting one inside the compiler.
 425   bool UseRetpolineExternalThunk = false;
 426
 427   /// Use software floating point for code generation.
 428   bool UseSoftFloat = false;
 429
 430   /// Use alias analysis during code generation.
 431   bool UseAA = false;
 432
 433   /// The minimum alignment known to hold of the stack frame on
 434   /// entry to the function and which must be maintained by every function.
 435   Align stackAlignment = Align(4);
 436
 437   /// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops.
 438   ///
 439   // FIXME: this is a known good value for Yonah. How about others?
 440   unsigned MaxInlineSizeThreshold = 128;
 441
 442   /// Indicates target prefers 128 bit instructions.
 443   bool Prefer128Bit = false;
 444
 445   /// Indicates target prefers 256 bit instructions.
 446   bool Prefer256Bit = false;
 447
 448   /// Threeway branch is profitable in this subtarget.
 449   bool ThreewayBranchProfitable = false;
 450
 451   /// What processor and OS we're targeting.
 452   Triple TargetTriple;
 453
 454   /// GlobalISel related APIs.
 455   std::unique_ptr<CallLowering> CallLoweringInfo;
 456   std::unique_ptr<LegalizerInfo> Legalizer;
 457   std::unique_ptr<RegisterBankInfo> RegBankInfo;
 458   std::unique_ptr<InstructionSelector> InstSelector;
 459
 460 private:
 461   /// Override the stack alignment.
 462   MaybeAlign StackAlignOverride;
 463
 464   /// Preferred vector width from function attribute.
 465   unsigned PreferVectorWidthOverride;
 466
 467   /// Resolved preferred vector width from function attribute and subtarget
 468   /// features.
 469   unsigned PreferVectorWidth = UINT32_MAX;
 470
 471   /// Required vector width from function attribute.
 472   unsigned RequiredVectorWidth;
 473
 474   /// True if compiling for 64-bit, false for 16-bit or 32-bit.
 475   bool In64BitMode;
 476
 477   /// True if compiling for 32-bit, false for 16-bit or 64-bit.
 478   bool In32BitMode;
 479
 480   /// True if compiling for 16-bit, false for 32-bit or 64-bit.
 481   bool In16BitMode;
 482
 483   /// Contains the Overhead of gather\scatter instructions
 484   int GatherOverhead = 1024;
 485   int ScatterOverhead = 1024;
 486
 487   X86SelectionDAGInfo TSInfo;
 488   // Ordering here is important. X86InstrInfo initializes X86RegisterInfo which
 489   // X86TargetLowering needs.
 490   X86InstrInfo InstrInfo;
 491   X86TargetLowering TLInfo;
 492   X86FrameLowering FrameLowering;
 493
 494 public:
 495   /// This constructor initializes the data members to match that
 496   /// of the specified triple.
 497   ///
 498   X86Subtarget(const Triple &TT, StringRef CPU, StringRef FS,
 499                const X86TargetMachine &TM, MaybeAlign StackAlignOverride,
 500                unsigned PreferVectorWidthOverride,
 501                unsigned RequiredVectorWidth);
 502
 503   const X86TargetLowering *getTargetLowering() const override {
 504     return &TLInfo;
 505   }
 506
 507   const X86InstrInfo *getInstrInfo() const override { return &InstrInfo; }
 508
 509   const X86FrameLowering *getFrameLowering() const override {
 510     return &FrameLowering;
 511   }
 512
 513   const X86SelectionDAGInfo *getSelectionDAGInfo() const override {
 514     return &TSInfo;
 515   }
 516
 517   const X86RegisterInfo *getRegisterInfo() const override {
 518     return &getInstrInfo()->getRegisterInfo();
 519   }
 520
 521   /// Returns the minimum alignment known to hold of the
 522   /// stack frame on entry to the function and which must be maintained by every
 523   /// function for this subtarget.
 524   Align getStackAlignment() const { return stackAlignment; }
 525
 526   /// Returns the maximum memset / memcpy size
 527   /// that still makes it profitable to inline the call.
 528   unsigned getMaxInlineSizeThreshold() const { return MaxInlineSizeThreshold; }
 529
 530   /// ParseSubtargetFeatures - Parses features string setting specified
 531   /// subtarget options.  Definition of function is auto generated by tblgen.
 532   void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
 533
 534   /// Methods used by Global ISel
 535   const CallLowering *getCallLowering() const override;
 536   InstructionSelector *getInstructionSelector() const override;
 537   const LegalizerInfo *getLegalizerInfo() const override;
 538   const RegisterBankInfo *getRegBankInfo() const override;
 539
 540 private:
 541   /// Initialize the full set of dependencies so we can use an initializer
 542   /// list for X86Subtarget.
 543   X86Subtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS);
 544   void initSubtargetFeatures(StringRef CPU, StringRef FS);
 545
 546 public:
 547   /// Is this x86_64? (disregarding specific ABI / programming model)
 548   bool is64Bit() const {
 549     return In64BitMode;
 550   }
 551
 552   bool is32Bit() const {
 553     return In32BitMode;
 554   }
 555
 556   bool is16Bit() const {
 557     return In16BitMode;
 558   }
 559
 560   /// Is this x86_64 with the ILP32 programming model (x32 ABI)?
 561   bool isTarget64BitILP32() const {
 562     return In64BitMode && (TargetTriple.getEnvironment() == Triple::GNUX32 ||
 563                            TargetTriple.isOSNaCl());
 564   }
 565
 566   /// Is this x86_64 with the LP64 programming model (standard AMD64, no x32)?
 567   bool isTarget64BitLP64() const {
 568     return In64BitMode && (TargetTriple.getEnvironment() != Triple::GNUX32 &&
 569                            !TargetTriple.isOSNaCl());
 570   }
 571
 572   PICStyles::Style getPICStyle() const { return PICStyle; }
 573   void setPICStyle(PICStyles::Style Style)  { PICStyle = Style; }
 574
 575   bool hasX87() const { return HasX87; }
 576   bool hasCmpxchg8b() const { return HasCmpxchg8b; }
 577   bool hasNOPL() const { return HasNOPL; }
 578   // SSE codegen depends on cmovs, and all SSE1+ processors support them.
 579   // All 64-bit processors support cmov.
 580   bool hasCMov() const { return HasCMov || X86SSELevel >= SSE1 || is64Bit(); }
 581   bool hasSSE1() const { return X86SSELevel >= SSE1; }
 582   bool hasSSE2() const { return X86SSELevel >= SSE2; }
 583   bool hasSSE3() const { return X86SSELevel >= SSE3; }
 584   bool hasSSSE3() const { return X86SSELevel >= SSSE3; }
 585   bool hasSSE41() const { return X86SSELevel >= SSE41; }
 586   bool hasSSE42() const { return X86SSELevel >= SSE42; }
 587   bool hasAVX() const { return X86SSELevel >= AVX; }
 588   bool hasAVX2() const { return X86SSELevel >= AVX2; }
 589   bool hasAVX512() const { return X86SSELevel >= AVX512F; }
 590   bool hasInt256() const { return hasAVX2(); }
 591   bool hasSSE4A() const { return HasSSE4A; }
 592   bool hasMMX() const { return X863DNowLevel >= MMX; }
 593   bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
 594   bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
 595   bool hasPOPCNT() const { return HasPOPCNT; }
 596   bool hasAES() const { return HasAES; }
 597   bool hasVAES() const { return HasVAES; }
 598   bool hasFXSR() const { return HasFXSR; }
 599   bool hasXSAVE() const { return HasXSAVE; }
 600   bool hasXSAVEOPT() const { return HasXSAVEOPT; }
 601   bool hasXSAVEC() const { return HasXSAVEC; }
 602   bool hasXSAVES() const { return HasXSAVES; }
 603   bool hasPCLMUL() const { return HasPCLMUL; }
 604   bool hasVPCLMULQDQ() const { return HasVPCLMULQDQ; }
 605   bool hasGFNI() const { return HasGFNI; }
 606   // Prefer FMA4 to FMA - its better for commutation/memory folding and
 607   // has equal or better performance on all supported targets.
 608   bool hasFMA() const { return HasFMA; }
 609   bool hasFMA4() const { return HasFMA4; }
 610   bool hasAnyFMA() const { return hasFMA() || hasFMA4(); }
 611   bool hasXOP() const { return HasXOP; }
 612   bool hasTBM() const { return HasTBM; }
 613   bool hasLWP() const { return HasLWP; }
 614   bool hasMOVBE() const { return HasMOVBE; }
 615   bool hasRDRAND() const { return HasRDRAND; }
 616   bool hasF16C() const { return HasF16C; }
 617   bool hasFSGSBase() const { return HasFSGSBase; }
 618   bool hasLZCNT() const { return HasLZCNT; }
 619   bool hasBMI() const { return HasBMI; }
 620   bool hasBMI2() const { return HasBMI2; }
 621   bool hasVBMI() const { return HasVBMI; }
 622   bool hasVBMI2() const { return HasVBMI2; }
 623   bool hasIFMA() const { return HasIFMA; }
 624   bool hasRTM() const { return HasRTM; }
 625   bool hasADX() const { return HasADX; }
 626   bool hasSHA() const { return HasSHA; }
 627   bool hasPRFCHW() const { return HasPRFCHW || HasPREFETCHWT1; }
 628   bool hasPREFETCHWT1() const { return HasPREFETCHWT1; }
 629   bool hasSSEPrefetch() const {
 630     // We implicitly enable these when we have a write prefix supporting cache
 631     // level OR if we have prfchw, but don't already have a read prefetch from
 632     // 3dnow.
 633     return hasSSE1() || (hasPRFCHW() && !has3DNow()) || hasPREFETCHWT1();
 634   }
 635   bool hasRDSEED() const { return HasRDSEED; }
 636   bool hasLAHFSAHF() const { return HasLAHFSAHF; }
 637   bool hasMWAITX() const { return HasMWAITX; }
 638   bool hasCLZERO() const { return HasCLZERO; }
 639   bool hasCLDEMOTE() const { return HasCLDEMOTE; }
 640   bool hasMOVDIRI() const { return HasMOVDIRI; }
 641   bool hasMOVDIR64B() const { return HasMOVDIR64B; }
 642   bool hasPTWRITE() const { return HasPTWRITE; }
 643   bool isSHLDSlow() const { return IsSHLDSlow; }
 644   bool isPMULLDSlow() const { return IsPMULLDSlow; }
 645   bool isPMADDWDSlow() const { return IsPMADDWDSlow; }
 646   bool isUnalignedMem16Slow() const { return IsUAMem16Slow; }
 647   bool isUnalignedMem32Slow() const { return IsUAMem32Slow; }
 648   int getGatherOverhead() const { return GatherOverhead; }
 649   int getScatterOverhead() const { return ScatterOverhead; }
 650   bool hasSSEUnalignedMem() const { return HasSSEUnalignedMem; }
 651   bool hasCmpxchg16b() const { return HasCmpxchg16b && is64Bit(); }
 652   bool useLeaForSP() const { return UseLeaForSP; }
 653   bool hasPOPCNTFalseDeps() const { return HasPOPCNTFalseDeps; }
 654   bool hasLZCNTFalseDeps() const { return HasLZCNTFalseDeps; }
 655   bool hasFastVariableShuffle() const {
 656     return HasFastVariableShuffle;
 657   }
 658   bool hasFastPartialYMMorZMMWrite() const {
 659     return HasFastPartialYMMorZMMWrite;
 660   }
 661   bool hasFastGather() const { return HasFastGather; }
 662   bool hasFastScalarFSQRT() const { return HasFastScalarFSQRT; }
 663   bool hasFastVectorFSQRT() const { return HasFastVectorFSQRT; }
 664   bool hasFastLZCNT() const { return HasFastLZCNT; }
 665   bool hasFastSHLDRotate() const { return HasFastSHLDRotate; }
 666   bool hasFastBEXTR() const { return HasFastBEXTR; }
 667   bool hasFastHorizontalOps() const { return HasFastHorizontalOps; }
 668   bool hasFastScalarShiftMasks() const { return HasFastScalarShiftMasks; }
 669   bool hasFastVectorShiftMasks() const { return HasFastVectorShiftMasks; }
 670   bool hasMacroFusion() const { return HasMacroFusion; }
 671   bool hasBranchFusion() const { return HasBranchFusion; }
 672   bool hasERMSB() const { return HasERMSB; }
 673   bool hasSlowDivide32() const { return HasSlowDivide32; }
 674   bool hasSlowDivide64() const { return HasSlowDivide64; }
 675   bool padShortFunctions() const { return PadShortFunctions; }
 676   bool slowTwoMemOps() const { return SlowTwoMemOps; }
 677   bool LEAusesAG() const { return LEAUsesAG; }
 678   bool slowLEA() const { return SlowLEA; }
 679   bool slow3OpsLEA() const { return Slow3OpsLEA; }
 680   bool slowIncDec() const { return SlowIncDec; }
 681   bool hasCDI() const { return HasCDI; }
 682   bool hasVPOPCNTDQ() const { return HasVPOPCNTDQ; }
 683   bool hasPFI() const { return HasPFI; }
 684   bool hasERI() const { return HasERI; }
 685   bool hasDQI() const { return HasDQI; }
 686   bool hasBWI() const { return HasBWI; }
 687   bool hasVLX() const { return HasVLX; }
 688   bool hasPKU() const { return HasPKU; }
 689   bool hasVNNI() const { return HasVNNI; }
 690   bool hasBF16() const { return HasBF16; }
 691   bool hasVP2INTERSECT() const { return HasVP2INTERSECT; }
 692   bool hasBITALG() const { return HasBITALG; }
 693   bool hasSHSTK() const { return HasSHSTK; }
 694   bool hasCLFLUSHOPT() const { return HasCLFLUSHOPT; }
 695   bool hasCLWB() const { return HasCLWB; }
 696   bool hasWBNOINVD() const { return HasWBNOINVD; }
 697   bool hasRDPID() const { return HasRDPID; }
 698   bool hasWAITPKG() const { return HasWAITPKG; }
 699   bool hasPCONFIG() const { return HasPCONFIG; }
 700   bool hasSGX() const { return HasSGX; }
 701   bool threewayBranchProfitable() const { return ThreewayBranchProfitable; }
 702   bool hasINVPCID() const { return HasINVPCID; }
 703   bool hasENQCMD() const { return HasENQCMD; }
 704   bool useRetpolineIndirectCalls() const { return UseRetpolineIndirectCalls; }
 705   bool useRetpolineIndirectBranches() const {
 706     return UseRetpolineIndirectBranches;
 707   }
 708   bool useRetpolineExternalThunk() const { return UseRetpolineExternalThunk; }
 709
 710   unsigned getPreferVectorWidth() const { return PreferVectorWidth; }
 711   unsigned getRequiredVectorWidth() const { return RequiredVectorWidth; }
 712
 713   // Helper functions to determine when we should allow widening to 512-bit
 714   // during codegen.
 715   // TODO: Currently we're always allowing widening on CPUs without VLX,
 716   // because for many cases we don't have a better option.
 717   bool canExtendTo512DQ() const {
 718     return hasAVX512() && (!hasVLX() || getPreferVectorWidth() >= 512);
 719   }
 720   bool canExtendTo512BW() const  {
 721     return hasBWI() && canExtendTo512DQ();
 722   }
 723
 724   // If there are no 512-bit vectors and we prefer not to use 512-bit registers,
 725   // disable them in the legalizer.
 726   bool useAVX512Regs() const {
 727     return hasAVX512() && (canExtendTo512DQ() || RequiredVectorWidth > 256);
 728   }
 729
 730   bool useBWIRegs() const {
 731     return hasBWI() && useAVX512Regs();
 732   }
 733
 734   bool isXRaySupported() const override { return is64Bit(); }
 735
 736   X86ProcFamilyEnum getProcFamily() const { return X86ProcFamily; }
 737
 738   /// TODO: to be removed later and replaced with suitable properties
 739   bool isAtom() const { return X86ProcFamily == IntelAtom; }
 740   bool isSLM() const { return X86ProcFamily == IntelSLM; }
 741   bool isGLM() const {
 742     return X86ProcFamily == IntelGLM ||
 743            X86ProcFamily == IntelGLP ||
 744            X86ProcFamily == IntelTRM;
 745   }
 746   bool useSoftFloat() const { return UseSoftFloat; }
 747   bool useAA() const override { return UseAA; }
 748
 749   /// Use mfence if we have SSE2 or we're on x86-64 (even if we asked for
 750   /// no-sse2). There isn't any reason to disable it if the target processor
 751   /// supports it.
 752   bool hasMFence() const { return hasSSE2() || is64Bit(); }
 753
 754   const Triple &getTargetTriple() const { return TargetTriple; }
 755
 756   bool isTargetDarwin() const { return TargetTriple.isOSDarwin(); }
 757   bool isTargetFreeBSD() const { return TargetTriple.isOSFreeBSD(); }
 758   bool isTargetDragonFly() const { return TargetTriple.isOSDragonFly(); }
 759   bool isTargetSolaris() const { return TargetTriple.isOSSolaris(); }
 760   bool isTargetPS4() const { return TargetTriple.isPS4CPU(); }
 761
 762   bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
 763   bool isTargetCOFF() const { return TargetTriple.isOSBinFormatCOFF(); }
 764   bool isTargetMachO() const { return TargetTriple.isOSBinFormatMachO(); }
 765
 766   bool isTargetLinux() const { return TargetTriple.isOSLinux(); }
 767   bool isTargetKFreeBSD() const { return TargetTriple.isOSKFreeBSD(); }
 768   bool isTargetGlibc() const { return TargetTriple.isOSGlibc(); }
 769   bool isTargetAndroid() const { return TargetTriple.isAndroid(); }
 770   bool isTargetNaCl() const { return TargetTriple.isOSNaCl(); }
 771   bool isTargetNaCl32() const { return isTargetNaCl() && !is64Bit(); }
 772   bool isTargetNaCl64() const { return isTargetNaCl() && is64Bit(); }
 773   bool isTargetMCU() const { return TargetTriple.isOSIAMCU(); }
 774   bool isTargetFuchsia() const { return TargetTriple.isOSFuchsia(); }
 775
 776   bool isTargetWindowsMSVC() const {
 777     return TargetTriple.isWindowsMSVCEnvironment();
 778   }
 779
 780   bool isTargetWindowsCoreCLR() const {
 781     return TargetTriple.isWindowsCoreCLREnvironment();
 782   }
 783
 784   bool isTargetWindowsCygwin() const {
 785     return TargetTriple.isWindowsCygwinEnvironment();
 786   }
 787
 788   bool isTargetWindowsGNU() const {
 789     return TargetTriple.isWindowsGNUEnvironment();
 790   }
 791
 792   bool isTargetWindowsItanium() const {
 793     return TargetTriple.isWindowsItaniumEnvironment();
 794   }
 795
 796   bool isTargetCygMing() const { return TargetTriple.isOSCygMing(); }
 797
 798   bool isOSWindows() const { return TargetTriple.isOSWindows(); }
 799
 800   bool isTargetWin64() const { return In64BitMode && isOSWindows(); }
 801
 802   bool isTargetWin32() const { return !In64BitMode && isOSWindows(); }
 803
 804   bool isPICStyleGOT() const { return PICStyle == PICStyles::GOT; }
 805   bool isPICStyleRIPRel() const { return PICStyle == PICStyles::RIPRel; }
 806
 807   bool isPICStyleStubPIC() const {
 808     return PICStyle == PICStyles::StubPIC;
 809   }
 810
 811   bool isPositionIndependent() const { return TM.isPositionIndependent(); }
 812
 813   bool isCallingConvWin64(CallingConv::ID CC) const {
 814     switch (CC) {
 815     // On Win64, all these conventions just use the default convention.
 816     case CallingConv::C:
 817     case CallingConv::Fast:
 818     case CallingConv::Tail:
 819     case CallingConv::Swift:
 820     case CallingConv::X86_FastCall:
 821     case CallingConv::X86_StdCall:
 822     case CallingConv::X86_ThisCall:
 823     case CallingConv::X86_VectorCall:
 824     case CallingConv::Intel_OCL_BI:
 825       return isTargetWin64();
 826     // This convention allows using the Win64 convention on other targets.
 827     case CallingConv::Win64:
 828       return true;
 829     // This convention allows using the SysV convention on Windows targets.
 830     case CallingConv::X86_64_SysV:
 831       return false;
 832     // Otherwise, who knows what this is.
 833     default:
 834       return false;
 835     }
 836   }
 837
 838   /// Classify a global variable reference for the current subtarget according
 839   /// to how we should reference it in a non-pcrel context.
 840   unsigned char classifyLocalReference(const GlobalValue *GV) const;
 841
 842   unsigned char classifyGlobalReference(const GlobalValue *GV,
 843                                         const Module &M) const;
 844   unsigned char classifyGlobalReference(const GlobalValue *GV) const;
 845
 846   /// Classify a global function reference for the current subtarget.
 847   unsigned char classifyGlobalFunctionReference(const GlobalValue *GV,
 848                                                 const Module &M) const;
 849   unsigned char classifyGlobalFunctionReference(const GlobalValue *GV) const;
 850
 851   /// Classify a blockaddress reference for the current subtarget according to
 852   /// how we should reference it in a non-pcrel context.
 853   unsigned char classifyBlockAddressReference() const;
 854
 855   /// Return true if the subtarget allows calls to immediate address.
 856   bool isLegalToCallImmediateAddr() const;
 857
 858   /// If we are using retpolines, we need to expand indirectbr to avoid it
 859   /// lowering to an actual indirect jump.
 860   bool enableIndirectBrExpand() const override {
 861     return useRetpolineIndirectBranches();
 862   }
 863
 864   /// Enable the MachineScheduler pass for all X86 subtargets.
 865   bool enableMachineScheduler() const override { return true; }
 866
 867   bool enableEarlyIfConversion() const override;
 868
 869   void getPostRAMutations(std::vector<std::unique_ptr<ScheduleDAGMutation>>
 870                               &Mutations) const override;
 871
 872   AntiDepBreakMode getAntiDepBreakMode() const override {
 873     return TargetSubtargetInfo::ANTIDEP_CRITICAL;
 874   }
 875
 876   bool enableAdvancedRASplitCost() const override { return true; }
 877 };
 878
 879 } // end namespace llvm
 880
 881 #endif // LLVM_LIB_TARGET_X86_X86SUBTARGET_H