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104 lines
3.7 KiB
C++
104 lines
3.7 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 was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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/Target/TargetOptions.h"
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#include "llvm/Type.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 PrintMachineCode;
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bool NoFramePointerElim;
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bool NoExcessFPPrecision;
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bool UnsafeFPMath;
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bool FiniteOnlyFPMathOption;
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Reloc::Model RelocationModel;
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}
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namespace {
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cl::opt<bool, true> PrintCode("print-machineinstrs",
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cl::desc("Print generated machine code"),
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cl::location(PrintMachineCode), cl::init(false));
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cl::opt<bool, true>
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DisableFPElim("disable-fp-elim",
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cl::desc("Disable frame pointer elimination optimization"),
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cl::location(NoFramePointerElim),
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cl::init(false));
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cl::opt<bool, true>
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DisableExcessPrecision("disable-excess-fp-precision",
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cl::desc("Disable optimizations that may increase FP precision"),
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cl::location(NoExcessFPPrecision),
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cl::init(false));
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cl::opt<bool, true>
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EnableUnsafeFPMath("enable-unsafe-fp-math",
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cl::desc("Enable optimizations that may decrease FP precision"),
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cl::location(UnsafeFPMath),
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cl::init(false));
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cl::opt<bool, true>
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EnableFiniteOnltFPMath("enable-finite-only-fp-math",
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cl::desc("Enable optimizations that assumes non- NaNs / +-Infs"),
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cl::location(FiniteOnlyFPMathOption),
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cl::init(false));
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cl::opt<llvm::Reloc::Model, true>
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DefRelocationModel(
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"relocation-model",
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cl::desc("Choose relocation model"),
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cl::location(RelocationModel),
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cl::init(Reloc::Default),
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cl::values(
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clEnumValN(Reloc::Default, "default",
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"Target default relocation model"),
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clEnumValN(Reloc::Static, "static",
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"Non-relocatable code"),
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clEnumValN(Reloc::PIC, "pic",
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"Fully relocatable, position independent code"),
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clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
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"Relocatable external references, non-relocatable code"),
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clEnumValEnd));
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}
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//---------------------------------------------------------------------------
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// TargetMachine Class
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//
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TargetMachine::TargetMachine(const std::string &name, const Module &M)
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: Name(name) {
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}
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TargetMachine::~TargetMachine() {
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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() {
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return RelocationModel;
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}
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/// setRelocationModel - Sets the code generation relocation model.
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void TargetMachine::setRelocationModel(Reloc::Model Model) {
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RelocationModel = Model;
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}
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namespace llvm {
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/// FiniteOnlyFPMath - This returns true when the -enable-finite-only-fp-math
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/// option is specified on the command line. If this returns false (default),
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/// the code generator is not allowed to assume that FP arithmetic arguments
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/// and results are never NaNs or +-Infs.
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bool FiniteOnlyFPMath() { return UnsafeFPMath || FiniteOnlyFPMathOption; }
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}
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