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llvm-project/llvm/lib/Target/X86/X86Subtarget.h

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//===-- X86Subtarget.h - Define Subtarget for the X86 ----------*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the X86 specific subclass of TargetSubtargetInfo.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_X86_X86SUBTARGET_H
#define LLVM_LIB_TARGET_X86_X86SUBTARGET_H
#include "X86FrameLowering.h"
#include "X86ISelLowering.h"
#include "X86InstrInfo.h"
#include "X86SelectionDAGInfo.h"
#include "llvm/ADT/Triple.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/Target/TargetSubtargetInfo.h"
#include <string>
#define GET_SUBTARGETINFO_HEADER
#include "X86GenSubtargetInfo.inc"
namespace llvm {
class GlobalValue;
class StringRef;
class TargetMachine;
/// The X86 backend supports a number of different styles of PIC.
///
namespace PICStyles {
enum Style {
StubPIC, // Used on i386-darwin in -fPIC mode.
StubDynamicNoPIC, // Used on i386-darwin in -mdynamic-no-pic mode.
GOT, // Used on many 32-bit unices in -fPIC mode.
RIPRel, // Used on X86-64 when not in -static mode.
None // Set when in -static mode (not PIC or DynamicNoPIC mode).
};
}
class X86Subtarget final : public X86GenSubtargetInfo {
protected:
enum X86SSEEnum {
NoSSE, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, AVX, AVX2, AVX512F
};
enum X863DNowEnum {
NoThreeDNow, MMX, ThreeDNow, ThreeDNowA
};
enum X86ProcFamilyEnum {
Others, IntelAtom, IntelSLM
};
/// X86 processor family: Intel Atom, and others
X86ProcFamilyEnum X86ProcFamily;
/// Which PIC style to use
PICStyles::Style PICStyle;
/// SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, or none supported.
X86SSEEnum X86SSELevel;
/// MMX, 3DNow, 3DNow Athlon, or none supported.
X863DNowEnum X863DNowLevel;
/// True if the processor supports X87 instructions.
bool HasX87;
/// True if this processor has conditional move instructions
/// (generally pentium pro+).
bool HasCMov;
/// True if the processor supports X86-64 instructions.
bool HasX86_64;
/// True if the processor supports POPCNT.
bool HasPOPCNT;
/// True if the processor supports SSE4A instructions.
bool HasSSE4A;
/// Target has AES instructions
bool HasAES;
/// Target has FXSAVE/FXRESTOR instructions
bool HasFXSR;
/// Target has XSAVE instructions
bool HasXSAVE;
/// Target has XSAVEOPT instructions
bool HasXSAVEOPT;
/// Target has XSAVEC instructions
bool HasXSAVEC;
/// Target has XSAVES instructions
bool HasXSAVES;
/// Target has carry-less multiplication
bool HasPCLMUL;
/// Target has 3-operand fused multiply-add
bool HasFMA;
/// Target has 4-operand fused multiply-add
bool HasFMA4;
/// Target has XOP instructions
bool HasXOP;
/// Target has TBM instructions.
bool HasTBM;
/// True if the processor has the MOVBE instruction.
bool HasMOVBE;
/// True if the processor has the RDRAND instruction.
bool HasRDRAND;
/// Processor has 16-bit floating point conversion instructions.
bool HasF16C;
/// Processor has FS/GS base insturctions.
bool HasFSGSBase;
/// Processor has LZCNT instruction.
bool HasLZCNT;
/// Processor has BMI1 instructions.
bool HasBMI;
/// Processor has BMI2 instructions.
bool HasBMI2;
/// Processor has VBMI instructions.
bool HasVBMI;
/// Processor has Integer Fused Multiply Add
bool HasIFMA;
/// Processor has RTM instructions.
bool HasRTM;
/// Processor has HLE.
bool HasHLE;
/// Processor has ADX instructions.
bool HasADX;
/// Processor has SHA instructions.
bool HasSHA;
/// Processor has PRFCHW instructions.
bool HasPRFCHW;
/// Processor has RDSEED instructions.
bool HasRDSEED;
/// Processor has LAHF/SAHF instructions.
bool HasLAHFSAHF;
/// Processor has Prefetch with intent to Write instruction
bool HasPFPREFETCHWT1;
/// True if BT (bit test) of memory instructions are slow.
bool IsBTMemSlow;
/// True if SHLD instructions are slow.
bool IsSHLDSlow;
/// True if unaligned memory accesses of 16-bytes are slow.
bool IsUAMem16Slow;
/// True if unaligned memory accesses of 32-bytes are slow.
bool IsUAMem32Slow;
/// True if SSE operations can have unaligned memory operands.
/// This may require setting a configuration bit in the processor.
bool HasSSEUnalignedMem;
/// True if this processor has the CMPXCHG16B instruction;
/// this is true for most x86-64 chips, but not the first AMD chips.
bool HasCmpxchg16b;
/// True if the LEA instruction should be used for adjusting
/// the stack pointer. This is an optimization for Intel Atom processors.
bool UseLeaForSP;
/// True if there is no performance penalty to writing only the lower parts
/// of a YMM register without clearing the upper part.
bool HasFastPartialYMMWrite;
/// True if 8-bit divisions are significantly faster than
/// 32-bit divisions and should be used when possible.
bool HasSlowDivide32;
/// True if 16-bit divides are significantly faster than
/// 64-bit divisions and should be used when possible.
bool HasSlowDivide64;
/// True if the short functions should be padded to prevent
/// a stall when returning too early.
bool PadShortFunctions;
/// True if the Calls with memory reference should be converted
/// to a register-based indirect call.
bool CallRegIndirect;
/// True if the LEA instruction inputs have to be ready at address generation
/// (AG) time.
bool LEAUsesAG;
/// True if the LEA instruction with certain arguments is slow
bool SlowLEA;
/// True if INC and DEC instructions are slow when writing to flags
bool SlowIncDec;
/// Processor has AVX-512 PreFetch Instructions
bool HasPFI;
/// Processor has AVX-512 Exponential and Reciprocal Instructions
bool HasERI;
/// Processor has AVX-512 Conflict Detection Instructions
bool HasCDI;
/// Processor has AVX-512 Doubleword and Quadword instructions
bool HasDQI;
/// Processor has AVX-512 Byte and Word instructions
bool HasBWI;
/// Processor has AVX-512 Vector Length eXtenstions
bool HasVLX;
/// Processor has PKU extenstions
bool HasPKU;
/// Processor supports MPX - Memory Protection Extensions
bool HasMPX;
/// Processor supports Invalidate Process-Context Identifier
bool HasInvPCId;
/// Processor has VM Functions
bool HasVMFUNC;
/// Processor has Supervisor Mode Access Protection
bool HasSMAP;
/// Processor has Software Guard Extensions
bool HasSGX;
/// Processor supports Flush Cache Line instruction
bool HasCLFLUSHOPT;
/// Processor has Persistent Commit feature
bool HasPCOMMIT;
/// Processor supports Cache Line Write Back instruction
bool HasCLWB;
/// Use software floating point for code generation.
bool UseSoftFloat;
/// The minimum alignment known to hold of the stack frame on
/// entry to the function and which must be maintained by every function.
unsigned stackAlignment;
/// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops.
///
unsigned MaxInlineSizeThreshold;
/// What processor and OS we're targeting.
Triple TargetTriple;
/// Instruction itineraries for scheduling
InstrItineraryData InstrItins;
private:
/// Override the stack alignment.
unsigned StackAlignOverride;
/// True if compiling for 64-bit, false for 16-bit or 32-bit.
bool In64BitMode;
/// True if compiling for 32-bit, false for 16-bit or 64-bit.
bool In32BitMode;
/// True if compiling for 16-bit, false for 32-bit or 64-bit.
bool In16BitMode;
X86SelectionDAGInfo TSInfo;
// Ordering here is important. X86InstrInfo initializes X86RegisterInfo which
// X86TargetLowering needs.
X86InstrInfo InstrInfo;
X86TargetLowering TLInfo;
X86FrameLowering FrameLowering;
public:
/// This constructor initializes the data members to match that
/// of the specified triple.
///
X86Subtarget(const Triple &TT, const std::string &CPU, const std::string &FS,
const X86TargetMachine &TM, unsigned StackAlignOverride);
const X86TargetLowering *getTargetLowering() const override {
return &TLInfo;
}
const X86InstrInfo *getInstrInfo() const override { return &InstrInfo; }
const X86FrameLowering *getFrameLowering() const override {
return &FrameLowering;
}
const X86SelectionDAGInfo *getSelectionDAGInfo() const override {
return &TSInfo;
}
const X86RegisterInfo *getRegisterInfo() const override {
return &getInstrInfo()->getRegisterInfo();
}
/// Returns the minimum alignment known to hold of the
/// stack frame on entry to the function and which must be maintained by every
/// function for this subtarget.
unsigned getStackAlignment() const { return stackAlignment; }
/// Returns the maximum memset / memcpy size
/// that still makes it profitable to inline the call.
unsigned getMaxInlineSizeThreshold() const { return MaxInlineSizeThreshold; }
/// ParseSubtargetFeatures - Parses features string setting specified
/// subtarget options. Definition of function is auto generated by tblgen.
void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
private:
/// Initialize the full set of dependencies so we can use an initializer
/// list for X86Subtarget.
X86Subtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS);
void initializeEnvironment();
void initSubtargetFeatures(StringRef CPU, StringRef FS);
public:
/// Is this x86_64? (disregarding specific ABI / programming model)
bool is64Bit() const {
return In64BitMode;
}
bool is32Bit() const {
return In32BitMode;
}
bool is16Bit() const {
return In16BitMode;
}
/// Is this x86_64 with the ILP32 programming model (x32 ABI)?
bool isTarget64BitILP32() const {
return In64BitMode && (TargetTriple.getEnvironment() == Triple::GNUX32 ||
TargetTriple.isOSNaCl());
}
/// Is this x86_64 with the LP64 programming model (standard AMD64, no x32)?
bool isTarget64BitLP64() const {
return In64BitMode && (TargetTriple.getEnvironment() != Triple::GNUX32 &&
!TargetTriple.isOSNaCl());
}
PICStyles::Style getPICStyle() const { return PICStyle; }
void setPICStyle(PICStyles::Style Style) { PICStyle = Style; }
bool hasX87() const { return HasX87; }
bool hasCMov() const { return HasCMov; }
bool hasSSE1() const { return X86SSELevel >= SSE1; }
bool hasSSE2() const { return X86SSELevel >= SSE2; }
bool hasSSE3() const { return X86SSELevel >= SSE3; }
bool hasSSSE3() const { return X86SSELevel >= SSSE3; }
bool hasSSE41() const { return X86SSELevel >= SSE41; }
bool hasSSE42() const { return X86SSELevel >= SSE42; }
bool hasAVX() const { return X86SSELevel >= AVX; }
bool hasAVX2() const { return X86SSELevel >= AVX2; }
bool hasAVX512() const { return X86SSELevel >= AVX512F; }
bool hasFp256() const { return hasAVX(); }
bool hasInt256() const { return hasAVX2(); }
bool hasSSE4A() const { return HasSSE4A; }
bool hasMMX() const { return X863DNowLevel >= MMX; }
bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
bool hasPOPCNT() const { return HasPOPCNT; }
bool hasAES() const { return HasAES; }
bool hasFXSR() const { return HasFXSR; }
bool hasXSAVE() const { return HasXSAVE; }
bool hasXSAVEOPT() const { return HasXSAVEOPT; }
bool hasXSAVEC() const { return HasXSAVEC; }
bool hasXSAVES() const { return HasXSAVES; }
bool hasPCLMUL() const { return HasPCLMUL; }
// Prefer FMA4 to FMA - its better for commutation/memory folding and
// has equal or better performance on all supported targets.
bool hasFMA() const { return HasFMA && !HasFMA4; }
bool hasFMA4() const { return HasFMA4; }
bool hasAnyFMA() const { return hasFMA() || hasFMA4() || hasAVX512(); }
bool hasXOP() const { return HasXOP; }
bool hasTBM() const { return HasTBM; }
bool hasMOVBE() const { return HasMOVBE; }
bool hasRDRAND() const { return HasRDRAND; }
bool hasF16C() const { return HasF16C; }
bool hasFSGSBase() const { return HasFSGSBase; }
bool hasLZCNT() const { return HasLZCNT; }
bool hasBMI() const { return HasBMI; }
bool hasBMI2() const { return HasBMI2; }
bool hasVBMI() const { return HasVBMI; }
bool hasIFMA() const { return HasIFMA; }
bool hasRTM() const { return HasRTM; }
bool hasHLE() const { return HasHLE; }
bool hasADX() const { return HasADX; }
bool hasSHA() const { return HasSHA; }
bool hasPRFCHW() const { return HasPRFCHW; }
bool hasRDSEED() const { return HasRDSEED; }
bool hasLAHFSAHF() const { return HasLAHFSAHF; }
bool isBTMemSlow() const { return IsBTMemSlow; }
bool isSHLDSlow() const { return IsSHLDSlow; }
bool isUnalignedMem16Slow() const { return IsUAMem16Slow; }
bool isUnalignedMem32Slow() const { return IsUAMem32Slow; }
bool hasSSEUnalignedMem() const { return HasSSEUnalignedMem; }
bool hasCmpxchg16b() const { return HasCmpxchg16b; }
bool useLeaForSP() const { return UseLeaForSP; }
bool hasFastPartialYMMWrite() const { return HasFastPartialYMMWrite; }
bool hasSlowDivide32() const { return HasSlowDivide32; }
bool hasSlowDivide64() const { return HasSlowDivide64; }
bool padShortFunctions() const { return PadShortFunctions; }
bool callRegIndirect() const { return CallRegIndirect; }
bool LEAusesAG() const { return LEAUsesAG; }
bool slowLEA() const { return SlowLEA; }
bool slowIncDec() const { return SlowIncDec; }
bool hasCDI() const { return HasCDI; }
bool hasPFI() const { return HasPFI; }
bool hasERI() const { return HasERI; }
bool hasDQI() const { return HasDQI; }
bool hasBWI() const { return HasBWI; }
bool hasVLX() const { return HasVLX; }
bool hasPKU() const { return HasPKU; }
bool hasMPX() const { return HasMPX; }
bool isAtom() const { return X86ProcFamily == IntelAtom; }
bool isSLM() const { return X86ProcFamily == IntelSLM; }
bool useSoftFloat() const { return UseSoftFloat; }
/// Use mfence if we have SSE2 or we're on x86-64 (even if we asked for
/// no-sse2). There isn't any reason to disable it if the target processor
/// supports it.
bool hasMFence() const { return hasSSE2() || is64Bit(); }
const Triple &getTargetTriple() const { return TargetTriple; }
bool isTargetDarwin() const { return TargetTriple.isOSDarwin(); }
bool isTargetFreeBSD() const { return TargetTriple.isOSFreeBSD(); }
bool isTargetDragonFly() const { return TargetTriple.isOSDragonFly(); }
bool isTargetSolaris() const { return TargetTriple.isOSSolaris(); }
bool isTargetPS4() const { return TargetTriple.isPS4(); }
bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
bool isTargetCOFF() const { return TargetTriple.isOSBinFormatCOFF(); }
bool isTargetMachO() const { return TargetTriple.isOSBinFormatMachO(); }
bool isTargetLinux() const { return TargetTriple.isOSLinux(); }
bool isTargetKFreeBSD() const { return TargetTriple.isOSKFreeBSD(); }
bool isTargetGlibc() const { return TargetTriple.isOSGlibc(); }
bool isTargetAndroid() const { return TargetTriple.isAndroid(); }
bool isTargetNaCl() const { return TargetTriple.isOSNaCl(); }
bool isTargetNaCl32() const { return isTargetNaCl() && !is64Bit(); }
bool isTargetNaCl64() const { return isTargetNaCl() && is64Bit(); }
bool isTargetMCU() const { return TargetTriple.isOSIAMCU(); }
bool isTargetWindowsMSVC() const {
return TargetTriple.isWindowsMSVCEnvironment();
}
bool isTargetKnownWindowsMSVC() const {
return TargetTriple.isKnownWindowsMSVCEnvironment();
}
bool isTargetWindowsCoreCLR() const {
return TargetTriple.isWindowsCoreCLREnvironment();
}
bool isTargetWindowsCygwin() const {
return TargetTriple.isWindowsCygwinEnvironment();
}
bool isTargetWindowsGNU() const {
return TargetTriple.isWindowsGNUEnvironment();
}
bool isTargetWindowsItanium() const {
return TargetTriple.isWindowsItaniumEnvironment();
}
bool isTargetCygMing() const { return TargetTriple.isOSCygMing(); }
bool isOSWindows() const { return TargetTriple.isOSWindows(); }
bool isTargetWin64() const {
return In64BitMode && TargetTriple.isOSWindows();
}
bool isTargetWin32() const {
return !In64BitMode && (isTargetCygMing() || isTargetKnownWindowsMSVC());
}
bool isPICStyleSet() const { return PICStyle != PICStyles::None; }
bool isPICStyleGOT() const { return PICStyle == PICStyles::GOT; }
bool isPICStyleRIPRel() const { return PICStyle == PICStyles::RIPRel; }
bool isPICStyleStubPIC() const {
return PICStyle == PICStyles::StubPIC;
}
bool isPICStyleStubNoDynamic() const {
return PICStyle == PICStyles::StubDynamicNoPIC;
}
bool isPICStyleStubAny() const {
return PICStyle == PICStyles::StubDynamicNoPIC ||
PICStyle == PICStyles::StubPIC;
}
bool isCallingConvWin64(CallingConv::ID CC) const {
switch (CC) {
// On Win64, all these conventions just use the default convention.
case CallingConv::C:
case CallingConv::Fast:
case CallingConv::X86_FastCall:
case CallingConv::X86_StdCall:
case CallingConv::X86_ThisCall:
case CallingConv::X86_VectorCall:
case CallingConv::Intel_OCL_BI:
return isTargetWin64();
// This convention allows using the Win64 convention on other targets.
case CallingConv::X86_64_Win64:
return true;
// This convention allows using the SysV convention on Windows targets.
case CallingConv::X86_64_SysV:
return false;
// Otherwise, who knows what this is.
default:
return false;
}
}
/// Determine if this global is defined in a Position Independent
/// Executable (PIE) where its definition cannot be interposed.
bool isGlobalDefinedInPIE(const GlobalValue *GV,
const TargetMachine &TM) const {
return GV->getParent()->getPIELevel() != PIELevel::Default &&
!GV->isDeclarationForLinker();
}
/// ClassifyGlobalReference - Classify a global variable reference for the
/// current subtarget according to how we should reference it in a non-pcrel
/// context.
unsigned char ClassifyGlobalReference(const GlobalValue *GV,
const TargetMachine &TM)const;
/// classifyGlobalFunctionReference - Classify a global function reference
/// for the current subtarget.
unsigned char classifyGlobalFunctionReference(const GlobalValue *GV,
const TargetMachine &TM) const;
/// Classify a blockaddress reference for the current subtarget according to
/// how we should reference it in a non-pcrel context.
unsigned char ClassifyBlockAddressReference() const;
/// Return true if the subtarget allows calls to immediate address.
bool IsLegalToCallImmediateAddr(const TargetMachine &TM) const;
/// This function returns the name of a function which has an interface
/// like the non-standard bzero function, if such a function exists on
/// the current subtarget and it is considered prefereable over
/// memset with zero passed as the second argument. Otherwise it
/// returns null.
const char *getBZeroEntry() const;
/// This function returns true if the target has sincos() routine in its
/// compiler runtime or math libraries.
bool hasSinCos() const;
/// Enable the MachineScheduler pass for all X86 subtargets.
bool enableMachineScheduler() const override { return true; }
bool enableEarlyIfConversion() const override;
/// Return the instruction itineraries based on the subtarget selection.
const InstrItineraryData *getInstrItineraryData() const override {
return &InstrItins;
}
AntiDepBreakMode getAntiDepBreakMode() const override {
return TargetSubtargetInfo::ANTIDEP_CRITICAL;
}
};
} // End llvm namespace
#endif
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