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Diffstat (limited to 'contrib/llvm/lib/Target/X86/X86Subtarget.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/X86/X86Subtarget.cpp | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/X86/X86Subtarget.cpp b/contrib/llvm/lib/Target/X86/X86Subtarget.cpp new file mode 100644 index 0000000..8ef08c9 --- /dev/null +++ b/contrib/llvm/lib/Target/X86/X86Subtarget.cpp @@ -0,0 +1,343 @@ +//===-- X86Subtarget.cpp - X86 Subtarget Information ----------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements the X86 specific subclass of TargetSubtargetInfo. +// +//===----------------------------------------------------------------------===// + +#include "X86Subtarget.h" +#include "X86InstrInfo.h" +#include "X86TargetMachine.h" +#include "llvm/IR/Attributes.h" +#include "llvm/IR/Function.h" +#include "llvm/IR/GlobalValue.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/Support/Debug.h" +#include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/Host.h" +#include "llvm/Support/raw_ostream.h" +#include "llvm/Target/TargetMachine.h" +#include "llvm/Target/TargetOptions.h" + +#if defined(_MSC_VER) +#include <intrin.h> +#endif + +using namespace llvm; + +#define DEBUG_TYPE "subtarget" + +#define GET_SUBTARGETINFO_TARGET_DESC +#define GET_SUBTARGETINFO_CTOR +#include "X86GenSubtargetInfo.inc" + +// Temporary option to control early if-conversion for x86 while adding machine +// models. +static cl::opt<bool> +X86EarlyIfConv("x86-early-ifcvt", cl::Hidden, + cl::desc("Enable early if-conversion on X86")); + + +/// Classify a blockaddress reference for the current subtarget according to how +/// we should reference it in a non-pcrel context. +unsigned char X86Subtarget::ClassifyBlockAddressReference() const { + if (isPICStyleGOT()) // 32-bit ELF targets. + return X86II::MO_GOTOFF; + + if (isPICStyleStubPIC()) // Darwin/32 in PIC mode. + return X86II::MO_PIC_BASE_OFFSET; + + // Direct static reference to label. + return X86II::MO_NO_FLAG; +} + +/// Classify a global variable reference for the current subtarget according to +/// how we should reference it in a non-pcrel context. +unsigned char X86Subtarget:: +ClassifyGlobalReference(const GlobalValue *GV, const TargetMachine &TM) const { + // DLLImport only exists on windows, it is implemented as a load from a + // DLLIMPORT stub. + if (GV->hasDLLImportStorageClass()) + return X86II::MO_DLLIMPORT; + + bool isDef = GV->isStrongDefinitionForLinker(); + + // X86-64 in PIC mode. + if (isPICStyleRIPRel()) { + // Large model never uses stubs. + if (TM.getCodeModel() == CodeModel::Large) + return X86II::MO_NO_FLAG; + + if (isTargetDarwin()) { + // If symbol visibility is hidden, the extra load is not needed if + // target is x86-64 or the symbol is definitely defined in the current + // translation unit. + if (GV->hasDefaultVisibility() && !isDef) + return X86II::MO_GOTPCREL; + } else if (!isTargetWin64()) { + assert(isTargetELF() && "Unknown rip-relative target"); + + // Extra load is needed for all externally visible. + if (!GV->hasLocalLinkage() && GV->hasDefaultVisibility()) + return X86II::MO_GOTPCREL; + } + + return X86II::MO_NO_FLAG; + } + + if (isPICStyleGOT()) { // 32-bit ELF targets. + // Extra load is needed for all externally visible. + if (GV->hasLocalLinkage() || GV->hasHiddenVisibility()) + return X86II::MO_GOTOFF; + return X86II::MO_GOT; + } + + if (isPICStyleStubPIC()) { // Darwin/32 in PIC mode. + // Determine whether we have a stub reference and/or whether the reference + // is relative to the PIC base or not. + + // If this is a strong reference to a definition, it is definitely not + // through a stub. + if (isDef) + return X86II::MO_PIC_BASE_OFFSET; + + // Unless we have a symbol with hidden visibility, we have to go through a + // normal $non_lazy_ptr stub because this symbol might be resolved late. + if (!GV->hasHiddenVisibility()) // Non-hidden $non_lazy_ptr reference. + return X86II::MO_DARWIN_NONLAZY_PIC_BASE; + + // If symbol visibility is hidden, we have a stub for common symbol + // references and external declarations. + if (GV->isDeclarationForLinker() || GV->hasCommonLinkage()) { + // Hidden $non_lazy_ptr reference. + return X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE; + } + + // Otherwise, no stub. + return X86II::MO_PIC_BASE_OFFSET; + } + + if (isPICStyleStubNoDynamic()) { // Darwin/32 in -mdynamic-no-pic mode. + // Determine whether we have a stub reference. + + // If this is a strong reference to a definition, it is definitely not + // through a stub. + if (isDef) + return X86II::MO_NO_FLAG; + + // Unless we have a symbol with hidden visibility, we have to go through a + // normal $non_lazy_ptr stub because this symbol might be resolved late. + if (!GV->hasHiddenVisibility()) // Non-hidden $non_lazy_ptr reference. + return X86II::MO_DARWIN_NONLAZY; + + // Otherwise, no stub. + return X86II::MO_NO_FLAG; + } + + // Direct static reference to global. + return X86II::MO_NO_FLAG; +} + + +/// 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 preferable over memset with zero +/// passed as the second argument. Otherwise it returns null. +const char *X86Subtarget::getBZeroEntry() const { + // Darwin 10 has a __bzero entry point for this purpose. + if (getTargetTriple().isMacOSX() && + !getTargetTriple().isMacOSXVersionLT(10, 6)) + return "__bzero"; + + return nullptr; +} + +bool X86Subtarget::hasSinCos() const { + return getTargetTriple().isMacOSX() && + !getTargetTriple().isMacOSXVersionLT(10, 9) && + is64Bit(); +} + +/// Return true if the subtarget allows calls to immediate address. +bool X86Subtarget::IsLegalToCallImmediateAddr(const TargetMachine &TM) const { + // FIXME: I386 PE/COFF supports PC relative calls using IMAGE_REL_I386_REL32 + // but WinCOFFObjectWriter::RecordRelocation cannot emit them. Once it does, + // the following check for Win32 should be removed. + if (In64BitMode || isTargetWin32()) + return false; + return isTargetELF() || TM.getRelocationModel() == Reloc::Static; +} + +void X86Subtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) { + std::string CPUName = CPU; + if (CPUName.empty()) + CPUName = "generic"; + + // Make sure 64-bit features are available in 64-bit mode. (But make sure + // SSE2 can be turned off explicitly.) + std::string FullFS = FS; + if (In64BitMode) { + if (!FullFS.empty()) + FullFS = "+64bit,+sse2," + FullFS; + else + FullFS = "+64bit,+sse2"; + } + + // LAHF/SAHF are always supported in non-64-bit mode. + if (!In64BitMode) { + if (!FullFS.empty()) + FullFS = "+sahf," + FullFS; + else + FullFS = "+sahf"; + } + + + // Parse features string and set the CPU. + ParseSubtargetFeatures(CPUName, FullFS); + + // All CPUs that implement SSE4.2 or SSE4A support unaligned accesses of + // 16-bytes and under that are reasonably fast. These features were + // introduced with Intel's Nehalem/Silvermont and AMD's Family10h + // micro-architectures respectively. + if (hasSSE42() || hasSSE4A()) + IsUAMem16Slow = false; + + InstrItins = getInstrItineraryForCPU(CPUName); + + // It's important to keep the MCSubtargetInfo feature bits in sync with + // target data structure which is shared with MC code emitter, etc. + if (In64BitMode) + ToggleFeature(X86::Mode64Bit); + else if (In32BitMode) + ToggleFeature(X86::Mode32Bit); + else if (In16BitMode) + ToggleFeature(X86::Mode16Bit); + else + llvm_unreachable("Not 16-bit, 32-bit or 64-bit mode!"); + + DEBUG(dbgs() << "Subtarget features: SSELevel " << X86SSELevel + << ", 3DNowLevel " << X863DNowLevel + << ", 64bit " << HasX86_64 << "\n"); + assert((!In64BitMode || HasX86_64) && + "64-bit code requested on a subtarget that doesn't support it!"); + + // Stack alignment is 16 bytes on Darwin, Linux and Solaris (both + // 32 and 64 bit) and for all 64-bit targets. + if (StackAlignOverride) + stackAlignment = StackAlignOverride; + else if (isTargetDarwin() || isTargetLinux() || isTargetSolaris() || + In64BitMode) + stackAlignment = 16; +} + +void X86Subtarget::initializeEnvironment() { + X86SSELevel = NoSSE; + X863DNowLevel = NoThreeDNow; + HasCMov = false; + HasX86_64 = false; + HasPOPCNT = false; + HasSSE4A = false; + HasAES = false; + HasFXSR = false; + HasXSAVE = false; + HasXSAVEOPT = false; + HasXSAVEC = false; + HasXSAVES = false; + HasPCLMUL = false; + HasFMA = false; + HasFMA4 = false; + HasXOP = false; + HasTBM = false; + HasMOVBE = false; + HasRDRAND = false; + HasF16C = false; + HasFSGSBase = false; + HasLZCNT = false; + HasBMI = false; + HasBMI2 = false; + HasRTM = false; + HasHLE = false; + HasERI = false; + HasCDI = false; + HasPFI = false; + HasDQI = false; + HasBWI = false; + HasVLX = false; + HasADX = false; + HasPKU = false; + HasSHA = false; + HasPRFCHW = false; + HasRDSEED = false; + HasLAHFSAHF = false; + HasMPX = false; + IsBTMemSlow = false; + IsSHLDSlow = false; + IsUAMem16Slow = false; + IsUAMem32Slow = false; + HasSSEUnalignedMem = false; + HasCmpxchg16b = false; + UseLeaForSP = false; + HasSlowDivide32 = false; + HasSlowDivide64 = false; + PadShortFunctions = false; + CallRegIndirect = false; + LEAUsesAG = false; + SlowLEA = false; + SlowIncDec = false; + stackAlignment = 4; + // FIXME: this is a known good value for Yonah. How about others? + MaxInlineSizeThreshold = 128; + UseSoftFloat = false; +} + +X86Subtarget &X86Subtarget::initializeSubtargetDependencies(StringRef CPU, + StringRef FS) { + initializeEnvironment(); + initSubtargetFeatures(CPU, FS); + return *this; +} + +X86Subtarget::X86Subtarget(const Triple &TT, const std::string &CPU, + const std::string &FS, const X86TargetMachine &TM, + unsigned StackAlignOverride) + : X86GenSubtargetInfo(TT, CPU, FS), X86ProcFamily(Others), + PICStyle(PICStyles::None), TargetTriple(TT), + StackAlignOverride(StackAlignOverride), + In64BitMode(TargetTriple.getArch() == Triple::x86_64), + In32BitMode(TargetTriple.getArch() == Triple::x86 && + TargetTriple.getEnvironment() != Triple::CODE16), + In16BitMode(TargetTriple.getArch() == Triple::x86 && + TargetTriple.getEnvironment() == Triple::CODE16), + TSInfo(), InstrInfo(initializeSubtargetDependencies(CPU, FS)), + TLInfo(TM, *this), FrameLowering(*this, getStackAlignment()) { + // Determine the PICStyle based on the target selected. + if (TM.getRelocationModel() == Reloc::Static) { + // Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None. + setPICStyle(PICStyles::None); + } else if (is64Bit()) { + // PIC in 64 bit mode is always rip-rel. + setPICStyle(PICStyles::RIPRel); + } else if (isTargetCOFF()) { + setPICStyle(PICStyles::None); + } else if (isTargetDarwin()) { + if (TM.getRelocationModel() == Reloc::PIC_) + setPICStyle(PICStyles::StubPIC); + else { + assert(TM.getRelocationModel() == Reloc::DynamicNoPIC); + setPICStyle(PICStyles::StubDynamicNoPIC); + } + } else if (isTargetELF()) { + setPICStyle(PICStyles::GOT); + } +} + +bool X86Subtarget::enableEarlyIfConversion() const { + return hasCMov() && X86EarlyIfConv; +} + |
