//===-- 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 MachineInstrInfo and MachineCacheInfo.
//
//===----------------------------------------------------------------------===//
+#include "llvm/Target/TargetAsmInfo.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/MachineInstrInfo.h"
-#include "llvm/Target/MachineCacheInfo.h"
-#include "llvm/CodeGen/PreSelection.h"
-#include "llvm/CodeGen/StackSlots.h"
-#include "llvm/CodeGen/InstrSelection.h"
-#include "llvm/CodeGen/InstrScheduling.h"
-#include "llvm/CodeGen/RegisterAllocation.h"
-#include "llvm/CodeGen/PeepholeOpts.h"
-#include "llvm/CodeGen/MachineCodeForMethod.h"
-#include "llvm/CodeGen/MachineCodeForInstruction.h"
-#include "llvm/Reoptimizer/Mapping/MappingInfo.h"
-#include "llvm/Reoptimizer/Mapping/FInfo.h"
-#include "llvm/Transforms/Scalar.h"
-#include "Support/CommandLine.h"
-#include "llvm/PassManager.h"
-#include "llvm/Function.h"
-#include "llvm/DerivedTypes.h"
+#include "llvm/Target/TargetOptions.h"
+#include "llvm/Support/CommandLine.h"
+using namespace llvm;
//---------------------------------------------------------------------------
-// Command line options to control choice of code generation passes.
-//---------------------------------------------------------------------------
-
-static cl::opt<bool> DisablePreSelect("nopreselect",
- cl::desc("Disable preselection pass"));
+// Command-line options that tend to be useful on more than one back-end.
+//
-static cl::opt<bool> DisableSched("nosched",
- cl::desc("Disable local scheduling pass"));
+namespace llvm {
+ bool PrintMachineCode;
+ bool NoFramePointerElim;
+ bool NoExcessFPPrecision;
+ bool UnsafeFPMath;
+ bool FiniteOnlyFPMathOption;
+ bool HonorSignDependentRoundingFPMathOption;
+ bool UseSoftFloat;
+ bool NoZerosInBSS;
+ bool ExceptionHandling;
+ bool UnwindTablesMandatory;
+ Reloc::Model RelocationModel;
+ CodeModel::Model CMModel;
+ bool PerformTailCallOpt;
+ bool OptimizeForSize;
+ unsigned StackAlignment;
+ bool RealignStack;
+ bool VerboseAsm;
+ bool DisableJumpTables;
+ bool DisableCorrectBranchFolding;
+}
-static cl::opt<bool> DisablePeephole("nopeephole",
- cl::desc("Disable peephole optimization pass"));
+static cl::opt<bool, true> PrintCode("print-machineinstrs",
+ cl::desc("Print generated machine code"),
+ cl::location(PrintMachineCode), cl::init(false));
+
+static cl::opt<bool, true>
+DisableFPElim("disable-fp-elim",
+ cl::desc("Disable frame pointer elimination optimization"),
+ cl::location(NoFramePointerElim),
+ cl::init(false));
+static cl::opt<bool, true>
+DisableExcessPrecision("disable-excess-fp-precision",
+ cl::desc("Disable optimizations that may increase FP precision"),
+ cl::location(NoExcessFPPrecision),
+ cl::init(false));
+static cl::opt<bool, true>
+EnableUnsafeFPMath("enable-unsafe-fp-math",
+ cl::desc("Enable optimizations that may decrease FP precision"),
+ cl::location(UnsafeFPMath),
+ cl::init(false));
+static cl::opt<bool, true>
+EnableFiniteOnlyFPMath("enable-finite-only-fp-math",
+ cl::desc("Enable optimizations that assumes non- NaNs / +-Infs"),
+ cl::location(FiniteOnlyFPMathOption),
+ cl::init(false));
+static cl::opt<bool, true>
+EnableHonorSignDependentRoundingFPMath(cl::Hidden,
+ "enable-sign-dependent-rounding-fp-math",
+ cl::desc("Force codegen to assume rounding mode can change dynamically"),
+ cl::location(HonorSignDependentRoundingFPMathOption),
+ cl::init(false));
+
+static cl::opt<bool, true>
+GenerateSoftFloatCalls("soft-float",
+ cl::desc("Generate software floating point library calls"),
+ cl::location(UseSoftFloat),
+ cl::init(false));
+static cl::opt<bool, true>
+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<bool, true>
+EnableExceptionHandling("enable-eh",
+ cl::desc("Emit DWARF exception handling (default if target supports)"),
+ cl::location(ExceptionHandling),
+ cl::init(false));
+static cl::opt<bool, true>
+EnableUnwindTables("unwind-tables",
+ cl::desc("Generate unwinding tables for all functions"),
+ cl::location(UnwindTablesMandatory),
+ cl::init(false));
+
+static 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));
+static cl::opt<llvm::CodeModel::Model, true>
+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<bool, true>
+EnablePerformTailCallOpt("tailcallopt",
+ cl::desc("Turn on tail call optimization."),
+ cl::location(PerformTailCallOpt),
+ cl::init(false));
+static cl::opt<bool, true>
+EnableOptimizeForSize("optimize-size",
+ cl::desc("Optimize for size."),
+ cl::location(OptimizeForSize),
+ cl::init(false));
+
+static cl::opt<unsigned, true>
+OverrideStackAlignment("stack-alignment",
+ cl::desc("Override default stack alignment"),
+ cl::location(StackAlignment),
+ cl::init(0));
+
+static cl::opt<bool, true>
+EnableRealignStack("realign-stack",
+ cl::desc("Realign stack if needed"),
+ cl::location(RealignStack),
+ cl::init(true));
+
+static cl::opt<bool, true>
+AsmVerbose("asm-verbose", cl::desc("Add comments to directives."),
+ cl::location(VerboseAsm),
+ cl::init(false));
+
+static cl::opt<bool, true>
+DisableSwitchTables(cl::Hidden, "disable-jump-tables",
+ cl::desc("Do not generate jump tables."),
+ cl::location(DisableJumpTables),
+ cl::init(false));
+
+static cl::opt<bool, true>
+DisableCorrectISelFolding(cl::Hidden, "disable-correct-folding",
+cl::desc("Do not perform correct branch folding in the instruction selector."),
+cl::location(DisableCorrectBranchFolding), cl::init(false));
//---------------------------------------------------------------------------
-// class TargetMachine
-//
-// Purpose:
-// Machine description.
-//
-//---------------------------------------------------------------------------
-
+// TargetMachine Class
+//
-// 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);
- }
+TargetMachine::~TargetMachine() {
+ delete AsmInfo;
}
-
-//===---------------------------------------------------------------------===//
-// Default code generation passes.
-//
-// Native code generation for a specified target.
-//===---------------------------------------------------------------------===//
-
-class ConstructMachineCodeForFunction : public FunctionPass {
- TargetMachine &Target;
-public:
- inline ConstructMachineCodeForFunction(TargetMachine &T) : Target(T) {}
-
- const char *getPassName() const {
- return "ConstructMachineCodeForFunction";
- }
-
- bool runOnFunction(Function &F) {
- MachineCodeForMethod::construct(&F, Target);
- return false;
- }
-};
-
-struct FreeMachineCodeForFunction : public FunctionPass {
- const char *getPassName() const { return "FreeMachineCodeForFunction"; }
-
- static void freeMachineCode(Instruction &I) {
- MachineCodeForInstruction::destroy(&I);
- }
-
- bool runOnFunction(Function &F) {
- for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI)
- for (BasicBlock::iterator I = FI->begin(), E = FI->end(); I != E; ++I)
- MachineCodeForInstruction::get(I).dropAllReferences();
-
- for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI)
- for_each(FI->begin(), FI->end(), freeMachineCode);
-
- return false;
- }
-};
-
-// addPassesToEmitAssembly - This method controls the entire code generation
-// process for the ultra sparc.
-//
-void
-TargetMachine::addPassesToEmitAssembly(PassManager &PM, std::ostream &Out)
-{
- // Construct and initialize the MachineCodeForMethod object for this fn.
- PM.add(new ConstructMachineCodeForFunction(*this));
-
- //Insert empty stackslots in the stack frame of each function
- //so %fp+offset-8 and %fp+offset-16 are empty slots now!
- PM.add(createStackSlotsPass(*this));
-
- // Specialize LLVM code for this target machine and then
- // run basic dataflow optimizations on LLVM code.
- if (!DisablePreSelect)
- {
- PM.add(createPreSelectionPass(*this));
- /* PM.add(createReassociatePass()); */
- PM.add(createLICMPass());
- PM.add(createGCSEPass());
- }
-
- PM.add(createInstructionSelectionPass(*this));
-
- if (!DisableSched)
- PM.add(createInstructionSchedulingWithSSAPass(*this));
-
- PM.add(getRegisterAllocator(*this));
-
- PM.add(getPrologEpilogInsertionPass());
-
- if (!DisablePeephole)
- PM.add(createPeepholeOptsPass(*this));
-
- PM.add(MappingInfoForFunction(Out));
-
- // Output assembly language to the .s file. Assembly emission is split into
- // two parts: Function output and Global value output. This is because
- // function output is pipelined with all of the rest of code generation stuff,
- // allowing machine code representations for functions to be free'd after the
- // function has been emitted.
- //
- PM.add(getFunctionAsmPrinterPass(Out));
- PM.add(new FreeMachineCodeForFunction()); // Free stuff no longer needed
-
- // Emit Module level assembly after all of the functions have been processed.
- PM.add(getModuleAsmPrinterPass(Out));
-
- // Emit bytecode to the assembly file into its special section next
- PM.add(getEmitBytecodeToAsmPass(Out));
- PM.add(getFunctionInfo(Out));
+/// 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;
}
-
-//---------------------------------------------------------------------------
-// class MachineInstructionInfo
-// Interface to description of machine instructions
-//---------------------------------------------------------------------------
-
-
-/*ctor*/
-MachineInstrInfo::MachineInstrInfo(const TargetMachine& tgt,
- const MachineInstrDescriptor* _desc,
- unsigned int _descSize,
- unsigned int _numRealOpCodes)
- : target(tgt),
- desc(_desc), descSize(_descSize), numRealOpCodes(_numRealOpCodes)
-{
- // FIXME: TargetInstrDescriptors should not be global
- assert(TargetInstrDescriptors == NULL && desc != NULL);
- TargetInstrDescriptors = desc; // initialize global variable
-}
-
-
-MachineInstrInfo::~MachineInstrInfo()
-{
- TargetInstrDescriptors = NULL; // reset global variable
+/// setRelocationModel - Sets the code generation relocation model.
+void TargetMachine::setRelocationModel(Reloc::Model Model) {
+ RelocationModel = 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)
- {
- // NEED TO HANDLE UNSIGNED VALUES SINCE THEY MAY BECOME MUCH
- // SMALLER AFTER CASTING TO SIGN-EXTENDED int, short, or char.
- // See CreateUIntSetInstruction in SparcInstrInfo.cpp.
-
- // Now check if the constant fits
- if (intValue <= (int64_t) maxImmedValue &&
- intValue >= -((int64_t) maxImmedValue+1))
- return true;
- }
-
- return false;
+/// getCodeModel - Returns the code model. The choices are small, kernel,
+/// medium, large, and target default.
+CodeModel::Model TargetMachine::getCodeModel() {
+ return CMModel;
}
-
-//---------------------------------------------------------------------------
-// class MachineCacheInfo
-//
-// Purpose:
-// Describes properties of the target cache architecture.
-//---------------------------------------------------------------------------
-
-/*ctor*/
-MachineCacheInfo::MachineCacheInfo(const TargetMachine& tgt)
- : target(tgt)
-{
- Initialize();
+/// setCodeModel - Sets the code model.
+void TargetMachine::setCodeModel(CodeModel::Model Model) {
+ CMModel = Model;
}
-void
-MachineCacheInfo::Initialize()
-{
- numLevels = 2;
- cacheLineSizes.push_back(16); cacheLineSizes.push_back(32);
- cacheSizes.push_back(1 << 15); cacheSizes.push_back(1 << 20);
- cacheAssoc.push_back(1); cacheAssoc.push_back(4);
+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; }
+
+ /// 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;
+ }
}
+
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