f785676f2a
all of the features in the current working draft of the upcoming C++ standard, provisionally named C++1y. The code generator's performance is greatly increased, and the loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3. The PowerPC backend has made several major improvements to code generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ backends have all seen major feature work. Release notes for llvm and clang can be found here: <http://llvm.org/releases/3.4/docs/ReleaseNotes.html> <http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html> MFC after: 1 month
195 lines
6.1 KiB
C++
195 lines
6.1 KiB
C++
//===-- TargetMachine.cpp - General Target Information ---------------------==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file describes the general parts of a Target machine.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/GlobalAlias.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCCodeGenInfo.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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//---------------------------------------------------------------------------
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// Command-line options that tend to be useful on more than one back-end.
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//
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namespace llvm {
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bool HasDivModLibcall;
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bool AsmVerbosityDefault(false);
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}
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static cl::opt<bool>
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DataSections("fdata-sections",
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cl::desc("Emit data into separate sections"),
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cl::init(false));
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static cl::opt<bool>
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FunctionSections("ffunction-sections",
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cl::desc("Emit functions into separate sections"),
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cl::init(false));
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//---------------------------------------------------------------------------
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// TargetMachine Class
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//
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TargetMachine::TargetMachine(const Target &T,
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StringRef TT, StringRef CPU, StringRef FS,
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const TargetOptions &Options)
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: TheTarget(T), TargetTriple(TT), TargetCPU(CPU), TargetFS(FS),
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CodeGenInfo(0), AsmInfo(0),
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MCRelaxAll(false),
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MCNoExecStack(false),
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MCSaveTempLabels(false),
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MCUseLoc(true),
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MCUseCFI(true),
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MCUseDwarfDirectory(false),
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Options(Options) {
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}
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TargetMachine::~TargetMachine() {
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delete CodeGenInfo;
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delete AsmInfo;
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}
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/// \brief Reset the target options based on the function's attributes.
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void TargetMachine::resetTargetOptions(const MachineFunction *MF) const {
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const Function *F = MF->getFunction();
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TargetOptions &TO = MF->getTarget().Options;
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#define RESET_OPTION(X, Y) \
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do { \
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if (F->hasFnAttribute(Y)) \
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TO.X = \
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(F->getAttributes(). \
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getAttribute(AttributeSet::FunctionIndex, \
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Y).getValueAsString() == "true"); \
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} while (0)
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RESET_OPTION(NoFramePointerElim, "no-frame-pointer-elim");
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RESET_OPTION(LessPreciseFPMADOption, "less-precise-fpmad");
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RESET_OPTION(UnsafeFPMath, "unsafe-fp-math");
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RESET_OPTION(NoInfsFPMath, "no-infs-fp-math");
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RESET_OPTION(NoNaNsFPMath, "no-nans-fp-math");
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RESET_OPTION(UseSoftFloat, "use-soft-float");
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RESET_OPTION(DisableTailCalls, "disable-tail-calls");
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}
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/// getRelocationModel - Returns the code generation relocation model. The
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/// choices are static, PIC, and dynamic-no-pic, and target default.
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Reloc::Model TargetMachine::getRelocationModel() const {
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if (!CodeGenInfo)
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return Reloc::Default;
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return CodeGenInfo->getRelocationModel();
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}
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/// getCodeModel - Returns the code model. The choices are small, kernel,
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/// medium, large, and target default.
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CodeModel::Model TargetMachine::getCodeModel() const {
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if (!CodeGenInfo)
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return CodeModel::Default;
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return CodeGenInfo->getCodeModel();
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}
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/// Get the IR-specified TLS model for Var.
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static TLSModel::Model getSelectedTLSModel(const GlobalVariable *Var) {
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switch (Var->getThreadLocalMode()) {
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case GlobalVariable::NotThreadLocal:
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llvm_unreachable("getSelectedTLSModel for non-TLS variable");
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break;
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case GlobalVariable::GeneralDynamicTLSModel:
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return TLSModel::GeneralDynamic;
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case GlobalVariable::LocalDynamicTLSModel:
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return TLSModel::LocalDynamic;
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case GlobalVariable::InitialExecTLSModel:
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return TLSModel::InitialExec;
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case GlobalVariable::LocalExecTLSModel:
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return TLSModel::LocalExec;
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}
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llvm_unreachable("invalid TLS model");
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}
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TLSModel::Model TargetMachine::getTLSModel(const GlobalValue *GV) const {
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// If GV is an alias then use the aliasee for determining
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// thread-localness.
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if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
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GV = GA->resolveAliasedGlobal(false);
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const GlobalVariable *Var = cast<GlobalVariable>(GV);
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bool isLocal = Var->hasLocalLinkage();
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bool isDeclaration = Var->isDeclaration();
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bool isPIC = getRelocationModel() == Reloc::PIC_;
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bool isPIE = Options.PositionIndependentExecutable;
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// FIXME: what should we do for protected and internal visibility?
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// For variables, is internal different from hidden?
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bool isHidden = Var->hasHiddenVisibility();
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TLSModel::Model Model;
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if (isPIC && !isPIE) {
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if (isLocal || isHidden)
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Model = TLSModel::LocalDynamic;
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else
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Model = TLSModel::GeneralDynamic;
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} else {
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if (!isDeclaration || isHidden)
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Model = TLSModel::LocalExec;
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else
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Model = TLSModel::InitialExec;
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}
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// If the user specified a more specific model, use that.
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TLSModel::Model SelectedModel = getSelectedTLSModel(Var);
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if (SelectedModel > Model)
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return SelectedModel;
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return Model;
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}
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/// getOptLevel - Returns the optimization level: None, Less,
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/// Default, or Aggressive.
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CodeGenOpt::Level TargetMachine::getOptLevel() const {
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if (!CodeGenInfo)
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return CodeGenOpt::Default;
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return CodeGenInfo->getOptLevel();
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}
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void TargetMachine::setOptLevel(CodeGenOpt::Level Level) const {
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if (CodeGenInfo)
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CodeGenInfo->setOptLevel(Level);
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}
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bool TargetMachine::getAsmVerbosityDefault() {
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return AsmVerbosityDefault;
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}
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void TargetMachine::setAsmVerbosityDefault(bool V) {
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AsmVerbosityDefault = V;
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}
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bool TargetMachine::getFunctionSections() {
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return FunctionSections;
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}
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bool TargetMachine::getDataSections() {
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return DataSections;
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}
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void TargetMachine::setFunctionSections(bool V) {
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FunctionSections = V;
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}
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void TargetMachine::setDataSections(bool V) {
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DataSections = V;
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}
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