diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/llvm/Target/TargetOptions.h | 40 |
1 files changed, 30 insertions, 10 deletions
diff --git a/include/llvm/Target/TargetOptions.h b/include/llvm/Target/TargetOptions.h index 84287fb5d7..3a1809a80a 100644 --- a/include/llvm/Target/TargetOptions.h +++ b/include/llvm/Target/TargetOptions.h @@ -30,12 +30,20 @@ namespace llvm { }; } + 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), - AllowExcessFPPrecision(false), UnsafeFPMath(false), NoInfsFPMath(false), + UnsafeFPMath(false), NoInfsFPMath(false), NoNaNsFPMath(false), HonorSignDependentRoundingFPMathOption(false), UseSoftFloat(false), NoZerosInBSS(false), JITExceptionHandling(false), JITEmitDebugInfo(false), JITEmitDebugInfoToDisk(false), @@ -43,7 +51,8 @@ namespace llvm { StackAlignmentOverride(0), RealignStack(true), DisableJumpTables(false), EnableFastISel(false), PositionIndependentExecutable(false), EnableSegmentedStacks(false), - UseInitArray(false), TrapFuncName(""), FloatABIType(FloatABI::Default) + UseInitArray(false), TrapFuncName(""), FloatABIType(FloatABI::Default), + AllowFPOpFusion(FPOpFusion::Standard) {} /// PrintMachineCode - This flag is enabled when the -print-machineinstrs @@ -74,14 +83,6 @@ namespace llvm { unsigned LessPreciseFPMADOption : 1; bool LessPreciseFPMAD() const; - /// AllowExcessFPPrecision - This flag is enabled when the - /// -enable-excess-fp-precision flag is specified on the command line. This - /// flag is OFF by default. When it is turned on, the code generator is - /// allowed to produce results that are "more precise" than IEEE allows. - /// This includes use of FMA-like operations and use of the X86 FP registers - /// without rounding all over the place. - unsigned AllowExcessFPPrecision : 1; - /// 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 @@ -189,6 +190,25 @@ namespace llvm { /// 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 |