//===-- TargetMachine.cpp - General Target Information ---------------------==//
//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and 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/TargetMachine.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Type.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 PrintMachineCode;
+ bool NoFramePointerElim;
+ bool NoExcessFPPrecision;
+ bool UnsafeFPMath;
+ bool FiniteOnlyFPMathOption;
+ Reloc::Model RelocationModel;
+ CodeModel::Model CMModel;
}
+namespace {
+ cl::opt<bool, true> PrintCode("print-machineinstrs",
+ cl::desc("Print generated machine code"),
+ cl::location(PrintMachineCode), cl::init(false));
+ cl::opt<bool, true>
+ DisableFPElim("disable-fp-elim",
+ cl::desc("Disable frame pointer elimination optimization"),
+ cl::location(NoFramePointerElim),
+ cl::init(false));
+ cl::opt<bool, true>
+ DisableExcessPrecision("disable-excess-fp-precision",
+ cl::desc("Disable optimizations that may increase FP precision"),
+ cl::location(NoExcessFPPrecision),
+ cl::init(false));
+ cl::opt<bool, true>
+ EnableUnsafeFPMath("enable-unsafe-fp-math",
+ cl::desc("Enable optimizations that may decrease FP precision"),
+ cl::location(UnsafeFPMath),
+ cl::init(false));
+ cl::opt<bool, true>
+ EnableFiniteOnltFPMath("enable-finite-only-fp-math",
+ cl::desc("Enable optimizations that assumes non- NaNs / +-Infs"),
+ cl::location(FiniteOnlyFPMathOption),
+ cl::init(false));
+ cl::opt<llvm::Reloc::Model, true>
+ 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));
+ cl::opt<llvm::CodeModel::Model, true>
+ DefCodeModel(
+ "code-model",
+ cl::desc("Choose relocation 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));
+}
//---------------------------------------------------------------------------
-// class MachineInstructionInfo
-// Interface to description of machine instructions
-//---------------------------------------------------------------------------
+// TargetMachine Class
+//
+TargetMachine::TargetMachine(const std::string &name, const Module &M)
+ : Name(name) {
+}
-/*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
-}
+TargetMachine::~TargetMachine() {
+}
+/// 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;
+}
-MachineInstrInfo::~MachineInstrInfo() {
- TargetInstrDescriptors = NULL; // reset global variable
+/// setRelocationModel - Sets the code generation relocation model.
+void TargetMachine::setRelocationModel(Reloc::Model Model) {
+ RelocationModel = Model;
}
+/// 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;
- }
-
- return false;
+namespace llvm {
+ /// 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; }
}
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