//===-- llvm/Target/TargetOptions.h - Target Options ------------*- C++ -*-===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This file defines command line option flags that are shared across various // targets. // //===----------------------------------------------------------------------===// #ifndef LLVM_TARGET_TARGETOPTIONS_H #define LLVM_TARGET_TARGETOPTIONS_H #include <string> namespace llvm { class MachineFunction; class StringRef; // Possible float ABI settings. Used with FloatABIType in TargetOptions.h. namespace FloatABI { enum ABIType { Default, // Target-specific (either soft or hard depending on triple, etc). Soft, // Soft float. Hard // Hard float. }; } namespace FPOpFusion { enum FPOpFusionMode { Fast, // Enable fusion of FP ops wherever it's profitable. Standard, // Only allow fusion of 'blessed' ops (currently just fmuladd). Strict // Never fuse FP-ops. }; } class TargetOptions { public: TargetOptions() : PrintMachineCode(false), NoFramePointerElim(false), NoFramePointerElimNonLeaf(false), LessPreciseFPMADOption(false), UnsafeFPMath(false), NoInfsFPMath(false), NoNaNsFPMath(false), HonorSignDependentRoundingFPMathOption(false), UseSoftFloat(false), NoZerosInBSS(false), JITExceptionHandling(false), JITEmitDebugInfo(false), JITEmitDebugInfoToDisk(false), GuaranteedTailCallOpt(false), DisableTailCalls(false), StackAlignmentOverride(0), RealignStack(true), EnableFastISel(false), PositionIndependentExecutable(false), EnableSegmentedStacks(false), UseInitArray(false), TrapFuncName(""), FloatABIType(FloatABI::Default), AllowFPOpFusion(FPOpFusion::Standard) {} /// PrintMachineCode - This flag is enabled when the -print-machineinstrs /// option is specified on the command line, and should enable debugging /// output from the code generator. unsigned PrintMachineCode : 1; /// NoFramePointerElim - This flag is enabled when the -disable-fp-elim is /// specified on the command line. If the target supports the frame pointer /// elimination optimization, this option should disable it. unsigned NoFramePointerElim : 1; /// NoFramePointerElimNonLeaf - This flag is enabled when the /// -disable-non-leaf-fp-elim is specified on the command line. If the /// target supports the frame pointer elimination optimization, this option /// should disable it for non-leaf functions. unsigned NoFramePointerElimNonLeaf : 1; /// DisableFramePointerElim - This returns true if frame pointer elimination /// optimization should be disabled for the given machine function. bool DisableFramePointerElim(const MachineFunction &MF) const; /// LessPreciseFPMAD - This flag is enabled when the /// -enable-fp-mad is specified on the command line. When this flag is off /// (the default), the code generator is not allowed to generate mad /// (multiply add) if the result is "less precise" than doing those /// operations individually. unsigned LessPreciseFPMADOption : 1; bool LessPreciseFPMAD() const; /// UnsafeFPMath - This flag is enabled when the /// -enable-unsafe-fp-math flag is specified on the command line. When /// this flag is off (the default), the code generator is not allowed to /// produce results that are "less precise" than IEEE allows. This includes /// use of X86 instructions like FSIN and FCOS instead of libcalls. /// UnsafeFPMath implies LessPreciseFPMAD. unsigned UnsafeFPMath : 1; /// NoInfsFPMath - This flag is enabled when the /// -enable-no-infs-fp-math flag is specified on the command line. When /// this flag is off (the default), the code generator is not allowed to /// assume the FP arithmetic arguments and results are never +-Infs. unsigned NoInfsFPMath : 1; /// NoNaNsFPMath - This flag is enabled when the /// -enable-no-nans-fp-math flag is specified on the command line. When /// this flag is off (the default), the code generator is not allowed to /// assume the FP arithmetic arguments and results are never NaNs. unsigned NoNaNsFPMath : 1; /// HonorSignDependentRoundingFPMath - This returns true when the /// -enable-sign-dependent-rounding-fp-math is specified. If this returns /// false (the default), the code generator is allowed to assume that the /// rounding behavior is the default (round-to-zero for all floating point /// to integer conversions, and round-to-nearest for all other arithmetic /// truncations). If this is enabled (set to true), the code generator must /// assume that the rounding mode may dynamically change. unsigned HonorSignDependentRoundingFPMathOption : 1; bool HonorSignDependentRoundingFPMath() const; /// UseSoftFloat - This flag is enabled when the -soft-float flag is /// specified on the command line. When this flag is on, the code generator /// will generate libcalls to the software floating point library instead of /// target FP instructions. unsigned UseSoftFloat : 1; /// NoZerosInBSS - By default some codegens place zero-initialized data to /// .bss section. This flag disables such behaviour (necessary, e.g. for /// crt*.o compiling). unsigned NoZerosInBSS : 1; /// JITExceptionHandling - This flag indicates that the JIT should emit /// exception handling information. unsigned JITExceptionHandling : 1; /// JITEmitDebugInfo - This flag indicates that the JIT should try to emit /// debug information and notify a debugger about it. unsigned JITEmitDebugInfo : 1; /// JITEmitDebugInfoToDisk - This flag indicates that the JIT should write /// the object files generated by the JITEmitDebugInfo flag to disk. This /// flag is hidden and is only for debugging the debug info. unsigned JITEmitDebugInfoToDisk : 1; /// GuaranteedTailCallOpt - This flag is enabled when -tailcallopt is /// specified on the commandline. When the flag is on, participating targets /// will perform tail call optimization on all calls which use the fastcc /// calling convention and which satisfy certain target-independent /// criteria (being at the end of a function, having the same return type /// as their parent function, etc.), using an alternate ABI if necessary. unsigned GuaranteedTailCallOpt : 1; /// DisableTailCalls - This flag controls whether we will use tail calls. /// Disabling them may be useful to maintain a correct call stack. unsigned DisableTailCalls : 1; /// StackAlignmentOverride - Override default stack alignment for target. unsigned StackAlignmentOverride; /// RealignStack - This flag indicates whether the stack should be /// automatically realigned, if needed. unsigned RealignStack : 1; /// SSPBufferSize - The minimum size of buffers that will receive stack /// smashing protection when -fstack-protection is used. unsigned SSPBufferSize; /// EnableFastISel - This flag enables fast-path instruction selection /// which trades away generated code quality in favor of reducing /// compile time. unsigned EnableFastISel : 1; /// PositionIndependentExecutable - This flag indicates whether the code /// will eventually be linked into a single executable, despite the PIC /// relocation model being in use. It's value is undefined (and irrelevant) /// if the relocation model is anything other than PIC. unsigned PositionIndependentExecutable : 1; unsigned EnableSegmentedStacks : 1; /// UseInitArray - Use .init_array instead of .ctors for static /// constructors. unsigned UseInitArray : 1; /// 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. std::string TrapFuncName; StringRef getTrapFunctionName() const; /// FloatABIType - This setting is set by -float-abi=xxx option is specfied /// on the command line. This setting may either be Default, Soft, or Hard. /// Default selects the target's default behavior. Soft selects the ABI for /// UseSoftFloat, but does not indicate that FP hardware may not be used. /// Such a combination is unfortunately popular (e.g. arm-apple-darwin). /// Hard presumes that the normal FP ABI is used. FloatABI::ABIType FloatABIType; /// AllowFPOpFusion - This flag is set by the -fuse-fp-ops=xxx option. /// This controls the creation of fused FP ops that store intermediate /// results in higher precision than IEEE allows (E.g. FMAs). /// /// Fast mode - allows formation of fused FP ops whenever they're /// profitable. /// Standard mode - allow fusion only for 'blessed' FP ops. At present the /// only blessed op is the fmuladd intrinsic. In the future more blessed ops /// may be added. /// Strict mode - allow fusion only if/when it can be proven that the excess /// precision won't effect the result. /// /// Note: This option only controls formation of fused ops by the optimizers. /// Fused operations that are explicitly specified (e.g. FMA via the /// llvm.fma.* intrinsic) will always be honored, regardless of the value of /// this option. FPOpFusion::FPOpFusionMode AllowFPOpFusion; }; } // End llvm namespace #endif