mirror of
https://github.com/RPCS3/llvm.git
synced 2024-12-24 13:06:56 +00:00
2e07dedce3
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218804 91177308-0d34-0410-b5e6-96231b3b80d8
373 lines
12 KiB
C++
373 lines
12 KiB
C++
//===-- 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"));
|
|
|
|
|
|
/// ClassifyBlockAddressReference - 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;
|
|
}
|
|
|
|
/// ClassifyGlobalReference - 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;
|
|
|
|
// Determine whether this is a reference to a definition or a declaration.
|
|
// Materializable GVs (in JIT lazy compilation mode) do not require an extra
|
|
// load from stub.
|
|
bool isDecl = GV->hasAvailableExternallyLinkage();
|
|
if (GV->isDeclaration() && !GV->isMaterializable())
|
|
isDecl = true;
|
|
|
|
// 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() &&
|
|
(isDecl || GV->isWeakForLinker()))
|
|
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 (!isDecl && !GV->isWeakForLinker())
|
|
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 (isDecl || 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 (!isDecl && !GV->isWeakForLinker())
|
|
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;
|
|
}
|
|
|
|
|
|
/// getBZeroEntry - 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 *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();
|
|
}
|
|
|
|
/// IsLegalToCallImmediateAddr - 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";
|
|
}
|
|
|
|
// If feature string is not empty, parse features string.
|
|
ParseSubtargetFeatures(CPUName, FullFS);
|
|
|
|
// Make sure the right MCSchedModel is used.
|
|
InitCPUSchedModel(CPUName);
|
|
|
|
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 = NoMMXSSE;
|
|
X863DNowLevel = NoThreeDNow;
|
|
HasCMov = false;
|
|
HasX86_64 = false;
|
|
HasPOPCNT = false;
|
|
HasSSE4A = false;
|
|
HasAES = 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;
|
|
HasSHA = false;
|
|
HasSGX = false;
|
|
HasPRFCHW = false;
|
|
HasRDSEED = false;
|
|
HasSMAP = false;
|
|
IsBTMemSlow = false;
|
|
IsSHLDSlow = false;
|
|
IsUAMemFast = false;
|
|
HasVectorUAMem = false;
|
|
HasCmpxchg16b = false;
|
|
UseLeaForSP = false;
|
|
HasSlowDivide = 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;
|
|
}
|
|
|
|
static std::string computeDataLayout(const Triple &TT) {
|
|
// X86 is little endian
|
|
std::string Ret = "e";
|
|
|
|
Ret += DataLayout::getManglingComponent(TT);
|
|
// X86 and x32 have 32 bit pointers.
|
|
if ((TT.isArch64Bit() &&
|
|
(TT.getEnvironment() == Triple::GNUX32 || TT.isOSNaCl())) ||
|
|
!TT.isArch64Bit())
|
|
Ret += "-p:32:32";
|
|
|
|
// Some ABIs align 64 bit integers and doubles to 64 bits, others to 32.
|
|
if (TT.isArch64Bit() || TT.isOSWindows() || TT.isOSNaCl())
|
|
Ret += "-i64:64";
|
|
else
|
|
Ret += "-f64:32:64";
|
|
|
|
// Some ABIs align long double to 128 bits, others to 32.
|
|
if (TT.isOSNaCl())
|
|
; // No f80
|
|
else if (TT.isArch64Bit() || TT.isOSDarwin())
|
|
Ret += "-f80:128";
|
|
else
|
|
Ret += "-f80:32";
|
|
|
|
// The registers can hold 8, 16, 32 or, in x86-64, 64 bits.
|
|
if (TT.isArch64Bit())
|
|
Ret += "-n8:16:32:64";
|
|
else
|
|
Ret += "-n8:16:32";
|
|
|
|
// The stack is aligned to 32 bits on some ABIs and 128 bits on others.
|
|
if (!TT.isArch64Bit() && TT.isOSWindows())
|
|
Ret += "-S32";
|
|
else
|
|
Ret += "-S128";
|
|
|
|
return Ret;
|
|
}
|
|
|
|
X86Subtarget &X86Subtarget::initializeSubtargetDependencies(StringRef CPU,
|
|
StringRef FS) {
|
|
initializeEnvironment();
|
|
initSubtargetFeatures(CPU, FS);
|
|
return *this;
|
|
}
|
|
|
|
X86Subtarget::X86Subtarget(const std::string &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),
|
|
DL(computeDataLayout(TargetTriple)),
|
|
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(DL), InstrInfo(initializeSubtargetDependencies(CPU, FS)),
|
|
TLInfo(TM), FrameLowering(TargetFrameLowering::StackGrowsDown,
|
|
getStackAlignment(), is64Bit() ? -8 : -4) {
|
|
// 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;
|
|
}
|
|
|