X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTarget%2FTargetMachine.cpp;h=c487cb805306ab221becf4ede0f19ca9184da639;hb=0eebf653a7b2978e7761f8d068b6fbec22aea0f6;hp=aecc88556707249e3918f00a578ee6bedb8dc629;hpb=78a81a24e148ec0e24b9c3253af0126f7b1f0c8b;p=oota-llvm.git diff --git a/lib/Target/TargetMachine.cpp b/lib/Target/TargetMachine.cpp index aecc8855670..c487cb80530 100644 --- a/lib/Target/TargetMachine.cpp +++ b/lib/Target/TargetMachine.cpp @@ -1,79 +1,240 @@ //===-- TargetMachine.cpp - General Target Information ---------------------==// // +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// // This file describes the general parts of a Target machine. -// This file also implements the InstInfo interface as well... // //===----------------------------------------------------------------------===// -#include "llvm/Target/InstInfo.h" -#include "llvm/DerivedTypes.h" +#include "llvm/Target/TargetAsmInfo.h" +#include "llvm/Target/TargetMachine.h" +#include "llvm/Target/TargetOptions.h" +#include "llvm/Support/CommandLine.h" +using namespace llvm; //--------------------------------------------------------------------------- -// class TargetMachine -// -// Purpose: -// Machine description. -// -//--------------------------------------------------------------------------- +// Command-line options that tend to be useful on more than one back-end. +// -// function TargetMachine::findOptimalStorageSize -// -// Purpose: -// This default implementation assumes that all sub-word data items use -// space equal to optSizeForSubWordData, and all other primitive data -// items use space according to the type. -// -unsigned int TargetMachine::findOptimalStorageSize(const Type* ty) const { - switch(ty->getPrimitiveID()) { - case Type::BoolTyID: - case Type::UByteTyID: - case Type::SByteTyID: - case Type::UShortTyID: - case Type::ShortTyID: - return optSizeForSubWordData; - - default: - return DataLayout.getTypeSize(ty); - } +namespace llvm { + bool LessPreciseFPMADOption; + bool PrintMachineCode; + bool NoFramePointerElim; + bool NoExcessFPPrecision; + bool UnsafeFPMath; + bool FiniteOnlyFPMathOption; + bool HonorSignDependentRoundingFPMathOption; + bool UseSoftFloat; + FloatABI::ABIType FloatABIType; + bool NoImplicitFloat; + bool NoZerosInBSS; + bool ExceptionHandling; + bool UnwindTablesMandatory; + Reloc::Model RelocationModel; + CodeModel::Model CMModel; + bool PerformTailCallOpt; + unsigned StackAlignment; + bool RealignStack; + bool DisableJumpTables; + bool StrongPHIElim; + bool AsmVerbosityDefault(false); } +static cl::opt +PrintCode("print-machineinstrs", + cl::desc("Print generated machine code"), + cl::location(PrintMachineCode), cl::init(false)); +static cl::opt +DisableFPElim("disable-fp-elim", + cl::desc("Disable frame pointer elimination optimization"), + cl::location(NoFramePointerElim), + cl::init(false)); +static cl::opt +DisableExcessPrecision("disable-excess-fp-precision", + cl::desc("Disable optimizations that may increase FP precision"), + cl::location(NoExcessFPPrecision), + cl::init(false)); +static cl::opt +EnableFPMAD("enable-fp-mad", + cl::desc("Enable less precise MAD instructions to be generated"), + cl::location(LessPreciseFPMADOption), + cl::init(false)); +static cl::opt +EnableUnsafeFPMath("enable-unsafe-fp-math", + cl::desc("Enable optimizations that may decrease FP precision"), + cl::location(UnsafeFPMath), + cl::init(false)); +static cl::opt +EnableFiniteOnlyFPMath("enable-finite-only-fp-math", + cl::desc("Enable optimizations that assumes non- NaNs / +-Infs"), + cl::location(FiniteOnlyFPMathOption), + cl::init(false)); +static cl::opt +EnableHonorSignDependentRoundingFPMath("enable-sign-dependent-rounding-fp-math", + cl::Hidden, + cl::desc("Force codegen to assume rounding mode can change dynamically"), + cl::location(HonorSignDependentRoundingFPMathOption), + cl::init(false)); +static cl::opt +GenerateSoftFloatCalls("soft-float", + cl::desc("Generate software floating point library calls"), + cl::location(UseSoftFloat), + cl::init(false)); +static cl::opt +FloatABIForCalls("float-abi", + cl::desc("Choose float ABI type"), + cl::location(FloatABIType), + cl::init(FloatABI::Default), + cl::values( + clEnumValN(FloatABI::Default, "default", + "Target default float ABI type"), + clEnumValN(FloatABI::Soft, "soft", + "Soft float ABI (implied by -soft-float)"), + clEnumValN(FloatABI::Hard, "hard", + "Hard float ABI (uses FP registers)"), + clEnumValEnd)); +static cl::opt +DontPlaceZerosInBSS("nozero-initialized-in-bss", + cl::desc("Don't place zero-initialized symbols into bss section"), + cl::location(NoZerosInBSS), + cl::init(false)); +static cl::opt +EnableExceptionHandling("enable-eh", + cl::desc("Emit DWARF exception handling (default if target supports)"), + cl::location(ExceptionHandling), + cl::init(false)); +static cl::opt +EnableUnwindTables("unwind-tables", + cl::desc("Generate unwinding tables for all functions"), + cl::location(UnwindTablesMandatory), + cl::init(false)); + +static cl::opt +DefRelocationModel("relocation-model", + cl::desc("Choose relocation model"), + cl::location(RelocationModel), + cl::init(Reloc::Default), + cl::values( + clEnumValN(Reloc::Default, "default", + "Target default relocation model"), + clEnumValN(Reloc::Static, "static", + "Non-relocatable code"), + clEnumValN(Reloc::PIC_, "pic", + "Fully relocatable, position independent code"), + clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic", + "Relocatable external references, non-relocatable code"), + clEnumValEnd)); +static cl::opt +DefCodeModel("code-model", + cl::desc("Choose code model"), + cl::location(CMModel), + cl::init(CodeModel::Default), + cl::values( + clEnumValN(CodeModel::Default, "default", + "Target default code model"), + clEnumValN(CodeModel::Small, "small", + "Small code model"), + clEnumValN(CodeModel::Kernel, "kernel", + "Kernel code model"), + clEnumValN(CodeModel::Medium, "medium", + "Medium code model"), + clEnumValN(CodeModel::Large, "large", + "Large code model"), + clEnumValEnd)); +static cl::opt +EnablePerformTailCallOpt("tailcallopt", + cl::desc("Turn on tail call optimization."), + cl::location(PerformTailCallOpt), + cl::init(false)); +static cl::opt +OverrideStackAlignment("stack-alignment", + cl::desc("Override default stack alignment"), + cl::location(StackAlignment), + cl::init(0)); +static cl::opt +EnableRealignStack("realign-stack", + cl::desc("Realign stack if needed"), + cl::location(RealignStack), + cl::init(true)); +static cl::opt +DisableSwitchTables(cl::Hidden, "disable-jump-tables", + cl::desc("Do not generate jump tables."), + cl::location(DisableJumpTables), + cl::init(false)); +static cl::opt +EnableStrongPHIElim(cl::Hidden, "strong-phi-elim", + cl::desc("Use strong PHI elimination."), + cl::location(StrongPHIElim), + cl::init(false)); //--------------------------------------------------------------------------- -// class MachineInstructionInfo -// Interface to description of machine instructions -//--------------------------------------------------------------------------- +// TargetMachine Class +// + +TargetMachine::TargetMachine() + : AsmInfo(0) { + // Typically it will be subtargets that will adjust FloatABIType from Default + // to Soft or Hard. + if (UseSoftFloat) + FloatABIType = FloatABI::Soft; +} +TargetMachine::~TargetMachine() { + delete AsmInfo; +} -/*ctor*/ -MachineInstrInfo::MachineInstrInfo(const MachineInstrDescriptor* _desc, - unsigned int _descSize, - unsigned int _numRealOpCodes) - : desc(_desc), descSize(_descSize), numRealOpCodes(_numRealOpCodes) -{ - // FIXME: TargetInstrDescriptors should not be global - assert(TargetInstrDescriptors == NULL && desc != NULL); - TargetInstrDescriptors = desc; // initialize global variable -} +/// getRelocationModel - Returns the code generation relocation model. The +/// choices are static, PIC, and dynamic-no-pic, and target default. +Reloc::Model TargetMachine::getRelocationModel() { + return RelocationModel; +} +/// setRelocationModel - Sets the code generation relocation model. +void TargetMachine::setRelocationModel(Reloc::Model Model) { + RelocationModel = Model; +} -MachineInstrInfo::~MachineInstrInfo() { - TargetInstrDescriptors = NULL; // reset global variable +/// getCodeModel - Returns the code model. The choices are small, kernel, +/// medium, large, and target default. +CodeModel::Model TargetMachine::getCodeModel() { + return CMModel; } +/// setCodeModel - Sets the code model. +void TargetMachine::setCodeModel(CodeModel::Model Model) { + CMModel = Model; +} -bool -MachineInstrInfo::constantFitsInImmedField(MachineOpCode opCode, - int64_t intValue) const -{ - // First, check if opCode has an immed field. - bool isSignExtended; - uint64_t maxImmedValue = maxImmedConstant(opCode, isSignExtended); - if (maxImmedValue != 0) { - // Now check if the constant fits - if (intValue <= (int64_t) maxImmedValue && - intValue >= -((int64_t) maxImmedValue+1)) - return true; - } +bool TargetMachine::getAsmVerbosityDefault() { + return AsmVerbosityDefault; +} + +void TargetMachine::setAsmVerbosityDefault(bool V) { + AsmVerbosityDefault = V; +} + +namespace llvm { + /// LessPreciseFPMAD - This flag return true when -enable-fp-mad option + /// is specified on the command line. When this flag is off(default), the + /// code generator is not allowed to generate mad (multiply add) if the + /// result is "less precise" than doing those operations individually. + bool LessPreciseFPMAD() { return UnsafeFPMath || LessPreciseFPMADOption; } + + /// FiniteOnlyFPMath - This returns true when the -enable-finite-only-fp-math + /// option is specified on the command line. If this returns false (default), + /// the code generator is not allowed to assume that FP arithmetic arguments + /// and results are never NaNs or +-Infs. + bool FiniteOnlyFPMath() { return UnsafeFPMath || FiniteOnlyFPMathOption; } - return false; + /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume + /// that the rounding mode of the FPU can change from its default. + bool HonorSignDependentRoundingFPMath() { + return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption; + } } +