//===-- 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/CodeGen/MachineFunction.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/MC/MCAsmInfo.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"));
-
-static cl::opt<bool> DisableSched("nosched",
- cl::desc("Disable local scheduling pass"));
-
-static cl::opt<bool> DisablePeephole("nopeephole",
- cl::desc("Disable peephole optimization pass"));
-
-//---------------------------------------------------------------------------
-// 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 NoFramePointerElimNonLeaf;
+ bool NoExcessFPPrecision;
+ bool UnsafeFPMath;
+ bool NoInfsFPMath;
+ bool NoNaNsFPMath;
+ bool HonorSignDependentRoundingFPMathOption;
+ bool UseSoftFloat;
+ FloatABI::ABIType FloatABIType;
+ bool NoImplicitFloat;
+ bool NoZerosInBSS;
+ bool JITExceptionHandling;
+ bool JITEmitDebugInfo;
+ bool JITEmitDebugInfoToDisk;
+ bool GuaranteedTailCallOpt;
+ unsigned StackAlignmentOverride;
+ bool RealignStack;
+ bool DisableJumpTables;
+ bool StrongPHIElim;
+ bool HasDivModLibcall;
+ bool AsmVerbosityDefault(false);
+ bool EnableSegmentedStacks;
}
-
-//===---------------------------------------------------------------------===//
-// 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.
+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>
+DisableFPElimNonLeaf("disable-non-leaf-fp-elim",
+ cl::desc("Disable frame pointer elimination optimization for non-leaf funcs"),
+ cl::location(NoFramePointerElimNonLeaf),
+ 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>
+EnableFPMAD("enable-fp-mad",
+ cl::desc("Enable less precise MAD instructions to be generated"),
+ cl::location(LessPreciseFPMADOption),
+ 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>
+EnableNoInfsFPMath("enable-no-infs-fp-math",
+ cl::desc("Enable FP math optimizations that assume no +-Infs"),
+ cl::location(NoInfsFPMath),
+ cl::init(false));
+static cl::opt<bool, true>
+EnableNoNaNsFPMath("enable-no-nans-fp-math",
+ cl::desc("Enable FP math optimizations that assume no NaNs"),
+ cl::location(NoNaNsFPMath),
+ cl::init(false));
+static cl::opt<bool, true>
+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<bool, true>
+GenerateSoftFloatCalls("soft-float",
+ cl::desc("Generate software floating point library calls"),
+ cl::location(UseSoftFloat),
+ cl::init(false));
+static cl::opt<llvm::FloatABI::ABIType, true>
+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<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>
+EnableJITExceptionHandling("jit-enable-eh",
+ cl::desc("Emit exception handling information"),
+ cl::location(JITExceptionHandling),
+ cl::init(false));
+// In debug builds, make this default to true.
+#ifdef NDEBUG
+#define EMIT_DEBUG false
+#else
+#define EMIT_DEBUG true
+#endif
+static cl::opt<bool, true>
+EmitJitDebugInfo("jit-emit-debug",
+ cl::desc("Emit debug information to debugger"),
+ cl::location(JITEmitDebugInfo),
+ cl::init(EMIT_DEBUG));
+#undef EMIT_DEBUG
+static cl::opt<bool, true>
+EmitJitDebugInfoToDisk("jit-emit-debug-to-disk",
+ cl::Hidden,
+ cl::desc("Emit debug info objfiles to disk"),
+ cl::location(JITEmitDebugInfoToDisk),
+ cl::init(false));
+
+static cl::opt<bool, true>
+EnableGuaranteedTailCallOpt("tailcallopt",
+ cl::desc("Turn fastcc calls into tail calls by (potentially) changing ABI."),
+ cl::location(GuaranteedTailCallOpt),
+ cl::init(false));
+static cl::opt<unsigned, true>
+OverrideStackAlignment("stack-alignment",
+ cl::desc("Override default stack alignment"),
+ cl::location(StackAlignmentOverride),
+ 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>
+DisableSwitchTables(cl::Hidden, "disable-jump-tables",
+ cl::desc("Do not generate jump tables."),
+ cl::location(DisableJumpTables),
+ cl::init(false));
+static cl::opt<bool, true>
+EnableStrongPHIElim(cl::Hidden, "strong-phi-elim",
+ cl::desc("Use strong PHI elimination."),
+ cl::location(StrongPHIElim),
+ cl::init(false));
+static cl::opt<std::string>
+TrapFuncName("trap-func", cl::Hidden,
+ cl::desc("Emit a call to trap function rather than a trap instruction"),
+ cl::init(""));
+static cl::opt<bool>
+DataSections("fdata-sections",
+ cl::desc("Emit data into separate sections"),
+ cl::init(false));
+static cl::opt<bool>
+FunctionSections("ffunction-sections",
+ cl::desc("Emit functions into separate sections"),
+ cl::init(false));
+static cl::opt<bool, true>
+SegmentedStacks("segmented-stacks",
+ cl::desc("Use segmented stacks if possible."),
+ cl::location(EnableSegmentedStacks),
+ cl::init(false));
+
+//---------------------------------------------------------------------------
+// TargetMachine Class
//
-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(createGCSEPass());
- PM.add(createLICMPass());
- }
-
- 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
+TargetMachine::TargetMachine(const Target &T,
+ StringRef TT, StringRef CPU, StringRef FS)
+ : TheTarget(T), TargetTriple(TT), TargetCPU(CPU), TargetFS(FS),
+ CodeGenInfo(0), AsmInfo(0),
+ MCRelaxAll(false),
+ MCNoExecStack(false),
+ MCSaveTempLabels(false),
+ MCUseLoc(true),
+ MCUseCFI(true) {
+ // Typically it will be subtargets that will adjust FloatABIType from Default
+ // to Soft or Hard.
+ if (UseSoftFloat)
+ FloatABIType = FloatABI::Soft;
+}
- // Emit Module level assembly after all of the functions have been processed.
- PM.add(getModuleAsmPrinterPass(Out));
+TargetMachine::~TargetMachine() {
+ delete CodeGenInfo;
+ delete AsmInfo;
+}
- // 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() const {
+ if (!CodeGenInfo)
+ return Reloc::Default;
+ return CodeGenInfo->getRelocationModel();
}
+/// getCodeModel - Returns the code model. The choices are small, kernel,
+/// medium, large, and target default.
+CodeModel::Model TargetMachine::getCodeModel() const {
+ if (!CodeGenInfo)
+ return CodeModel::Default;
+ return CodeGenInfo->getCodeModel();
+}
-//---------------------------------------------------------------------------
-// class MachineInstructionInfo
-// Interface to description of machine instructions
-//---------------------------------------------------------------------------
+bool TargetMachine::getAsmVerbosityDefault() {
+ return AsmVerbosityDefault;
+}
+void TargetMachine::setAsmVerbosityDefault(bool V) {
+ AsmVerbosityDefault = V;
+}
-/*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
-}
+bool TargetMachine::getFunctionSections() {
+ return FunctionSections;
+}
+bool TargetMachine::getDataSections() {
+ return DataSections;
+}
-MachineInstrInfo::~MachineInstrInfo()
-{
- TargetInstrDescriptors = NULL; // reset global variable
+void TargetMachine::setFunctionSections(bool V) {
+ FunctionSections = V;
}
+void TargetMachine::setDataSections(bool V) {
+ DataSections = V;
+}
-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;
+namespace llvm {
+ /// DisableFramePointerElim - This returns true if frame pointer elimination
+ /// optimization should be disabled for the given machine function.
+ bool DisableFramePointerElim(const MachineFunction &MF) {
+ // Check to see if we should eliminate non-leaf frame pointers and then
+ // check to see if we should eliminate all frame pointers.
+ if (NoFramePointerElimNonLeaf && !NoFramePointerElim) {
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ return MFI->hasCalls();
}
-
- return false;
-}
+ return NoFramePointerElim;
+ }
-//---------------------------------------------------------------------------
-// class MachineCacheInfo
-//
-// Purpose:
-// Describes properties of the target cache architecture.
-//---------------------------------------------------------------------------
+ /// 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; }
-/*ctor*/
-MachineCacheInfo::MachineCacheInfo(const TargetMachine& tgt)
- : target(tgt)
-{
- Initialize();
-}
+ /// 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;
+ }
-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);
+ /// getTrapFunctionName - If this returns a non-empty string, this means isel
+ /// should lower Intrinsic::trap to a call to the specified function name
+ /// instead of an ISD::TRAP node.
+ StringRef getTrapFunctionName() {
+ return TrapFuncName;
+ }
}