llvm-6502/lib/Target/X86/X86TargetMachine.cpp
2014-01-08 00:08:50 +00:00

237 lines
7.4 KiB
C++

//===-- X86TargetMachine.cpp - Define TargetMachine for the X86 -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the X86 specific subclass of TargetMachine.
//
//===----------------------------------------------------------------------===//
#include "X86TargetMachine.h"
#include "X86.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/PassManager.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
extern "C" void LLVMInitializeX86Target() {
// Register the target.
RegisterTargetMachine<X86TargetMachine> X(TheX86_32Target);
RegisterTargetMachine<X86TargetMachine> Y(TheX86_64Target);
}
void X86TargetMachine::anchor() { }
static std::string computeDataLayout(const X86Subtarget &ST) {
// X86 is little endian
std::string Ret = "e";
Ret += DataLayout::getManglingComponent(ST.getTargetTriple());
// X86 and x32 have 32 bit pointers.
if (ST.isTarget64BitILP32() || !ST.is64Bit())
Ret += "-p:32:32";
// Some ABIs align 64 bit integers and doubles to 64 bits, others to 32.
if (ST.is64Bit() || ST.isTargetCygMing() || ST.isTargetWindows() ||
ST.isTargetNaCl())
Ret += "-i64:64";
else
Ret += "-f64:32:64";
// Some ABIs align long double to 128 bits, others to 32.
if (ST.isTargetNaCl())
; // No f80
else if (ST.is64Bit() || ST.isTargetDarwin())
Ret += "-f80:128";
else
Ret += "-f80:32";
// The registers can hold 8, 16, 32 or, in x86-64, 64 bits.
if (ST.is64Bit())
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 (!ST.is64Bit() && (ST.isTargetCygMing() || ST.isTargetWindows()))
Ret += "-S32";
else
Ret += "-S128";
return Ret;
}
/// X86TargetMachine ctor - Create an X86 target.
///
X86TargetMachine::X86TargetMachine(const Target &T, StringRef TT,
StringRef CPU, StringRef FS,
const TargetOptions &Options,
Reloc::Model RM, CodeModel::Model CM,
CodeGenOpt::Level OL)
: LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
Subtarget(TT, CPU, FS, Options.StackAlignmentOverride),
FrameLowering(*this, Subtarget),
InstrItins(Subtarget.getInstrItineraryData()),
DL(computeDataLayout(*getSubtargetImpl())),
InstrInfo(*this),
TLInfo(*this),
TSInfo(*this),
JITInfo(*this) {
// Determine the PICStyle based on the target selected.
if (getRelocationModel() == Reloc::Static) {
// Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.
Subtarget.setPICStyle(PICStyles::None);
} else if (Subtarget.is64Bit()) {
// PIC in 64 bit mode is always rip-rel.
Subtarget.setPICStyle(PICStyles::RIPRel);
} else if (Subtarget.isTargetCOFF()) {
Subtarget.setPICStyle(PICStyles::None);
} else if (Subtarget.isTargetDarwin()) {
if (getRelocationModel() == Reloc::PIC_)
Subtarget.setPICStyle(PICStyles::StubPIC);
else {
assert(getRelocationModel() == Reloc::DynamicNoPIC);
Subtarget.setPICStyle(PICStyles::StubDynamicNoPIC);
}
} else if (Subtarget.isTargetELF()) {
Subtarget.setPICStyle(PICStyles::GOT);
}
// default to hard float ABI
if (Options.FloatABIType == FloatABI::Default)
this->Options.FloatABIType = FloatABI::Hard;
initAsmInfo();
}
//===----------------------------------------------------------------------===//
// Command line options for x86
//===----------------------------------------------------------------------===//
static cl::opt<bool>
UseVZeroUpper("x86-use-vzeroupper", cl::Hidden,
cl::desc("Minimize AVX to SSE transition penalty"),
cl::init(true));
// 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"));
//===----------------------------------------------------------------------===//
// X86 Analysis Pass Setup
//===----------------------------------------------------------------------===//
void X86TargetMachine::addAnalysisPasses(PassManagerBase &PM) {
// Add first the target-independent BasicTTI pass, then our X86 pass. This
// allows the X86 pass to delegate to the target independent layer when
// appropriate.
PM.add(createBasicTargetTransformInfoPass(this));
PM.add(createX86TargetTransformInfoPass(this));
}
//===----------------------------------------------------------------------===//
// Pass Pipeline Configuration
//===----------------------------------------------------------------------===//
namespace {
/// X86 Code Generator Pass Configuration Options.
class X86PassConfig : public TargetPassConfig {
public:
X86PassConfig(X86TargetMachine *TM, PassManagerBase &PM)
: TargetPassConfig(TM, PM) {}
X86TargetMachine &getX86TargetMachine() const {
return getTM<X86TargetMachine>();
}
const X86Subtarget &getX86Subtarget() const {
return *getX86TargetMachine().getSubtargetImpl();
}
virtual bool addInstSelector();
virtual bool addILPOpts();
virtual bool addPreRegAlloc();
virtual bool addPostRegAlloc();
virtual bool addPreEmitPass();
};
} // namespace
TargetPassConfig *X86TargetMachine::createPassConfig(PassManagerBase &PM) {
return new X86PassConfig(this, PM);
}
bool X86PassConfig::addInstSelector() {
// Install an instruction selector.
addPass(createX86ISelDag(getX86TargetMachine(), getOptLevel()));
// For ELF, cleanup any local-dynamic TLS accesses.
if (getX86Subtarget().isTargetELF() && getOptLevel() != CodeGenOpt::None)
addPass(createCleanupLocalDynamicTLSPass());
// For 32-bit, prepend instructions to set the "global base reg" for PIC.
if (!getX86Subtarget().is64Bit())
addPass(createGlobalBaseRegPass());
return false;
}
bool X86PassConfig::addILPOpts() {
if (X86EarlyIfConv && getX86Subtarget().hasCMov()) {
addPass(&EarlyIfConverterID);
return true;
}
return false;
}
bool X86PassConfig::addPreRegAlloc() {
return false; // -print-machineinstr shouldn't print after this.
}
bool X86PassConfig::addPostRegAlloc() {
addPass(createX86FloatingPointStackifierPass());
return true; // -print-machineinstr should print after this.
}
bool X86PassConfig::addPreEmitPass() {
bool ShouldPrint = false;
if (getOptLevel() != CodeGenOpt::None && getX86Subtarget().hasSSE2()) {
addPass(createExecutionDependencyFixPass(&X86::VR128RegClass));
ShouldPrint = true;
}
if (getX86Subtarget().hasAVX() && UseVZeroUpper) {
addPass(createX86IssueVZeroUpperPass());
ShouldPrint = true;
}
if (getOptLevel() != CodeGenOpt::None &&
getX86Subtarget().padShortFunctions()) {
addPass(createX86PadShortFunctions());
ShouldPrint = true;
}
if (getOptLevel() != CodeGenOpt::None &&
getX86Subtarget().LEAusesAG()){
addPass(createX86FixupLEAs());
ShouldPrint = true;
}
return ShouldPrint;
}
bool X86TargetMachine::addCodeEmitter(PassManagerBase &PM,
JITCodeEmitter &JCE) {
PM.add(createX86JITCodeEmitterPass(*this, JCE));
return false;
}