search for: canfus

...se is this: // Floating-point multiply-add with intermediate rounding. bool HasFMAD = (LegalOperations && TLI.isOperationLegal(ISD::FMAD, VT)); static bool isContractable(SDNode *N) { SDNodeFlags F = N->getFlags(); return F.hasAllowContract() || F.hasAllowReassociation(); } bool CanFuse = Options.UnsafeFPMath || isContractable(N); bool AllowFusionGlobally = (Options.AllowFPOpFusion == FPOpFusion::Fast || CanFuse || HasFMAD); // If the addition is not contractable, do not combine. if (!AllowFusionGlobally && !isContractable(N)) return SDValue(); Specifically the Allow...

...  bool HasFMAD = (LegalOperations && > TLI.isOperationLegal(ISD::FMAD, VT)); > > static bool isContractable(SDNode *N) { >   SDNodeFlags F = N->getFlags(); >   return F.hasAllowContract() || F.hasAllowReassociation(); > } > > bool CanFuse = Options.UnsafeFPMath || isContractable(N); > bool AllowFusionGlobally = (Options.AllowFPOpFusion == > FPOpFusion::Fast || CanFuse || HasFMAD); > // If the addition is not contractable, do not combine. > if (!AllowFusionGlobally && !isContractable(N)) >...

...erationLegal(ISD::FMAD, VT)); > > > >     static bool isContractable(SDNode *N) { > >        SDNodeFlags F = N->getFlags(); > >        return F.hasAllowContract() || F.hasAllowReassociation(); > >     } > > > >     bool CanFuse = Options.UnsafeFPMath || isContractable(N); > >     bool AllowFusionGlobally = (Options.AllowFPOpFusion == > >     FPOpFusion::Fast || CanFuse || HasFMAD); > >     // If the addition is not contractable, do not combine. > >     if (!AllowFusionGlobally...

...     static bool isContractable(SDNode *N) { > >      >        SDNodeFlags F = N->getFlags(); > >      >        return F.hasAllowContract() || > F.hasAllowReassociation(); > >      >     } > >      > > >      >     bool CanFuse = Options.UnsafeFPMath || isContractable(N); > >      >     bool AllowFusionGlobally = (Options.AllowFPOpFusion == > >      >     FPOpFusion::Fast || CanFuse || HasFMAD); > >      >     // If the addition is not contractable, do not combine. > >...

...;>> > static bool isContractable(SDNode *N) { >>> > SDNodeFlags F = N->getFlags(); >>> > return F.hasAllowContract() || F.hasAllowReassociation(); >>> > } >>> > >>> > bool CanFuse = Options.UnsafeFPMath || isContractable(N); >>> > bool AllowFusionGlobally = (Options.AllowFPOpFusion == >>> > FPOpFusion::Fast || CanFuse || HasFMAD); >>> > // If the addition is not contractable, do not combine. >>> &g...

...ouble %c) { %mul = fmul fast double %b, %a %add = fadd fast double %mul, %c ret double %add } $ llc -mattr=+fma fma.ll -fp-contract=off -o - | grep vfmadd vfmadd213sd %xmm2, %xmm1, %xmm0 # xmm0 = (xmm1 * xmm0) + xmm2 It still generates an fma due to the logic in DAGCombiner: bool CanFuse = Options.UnsafeFPMath || isContractable(N); bool AllowFusionGlobally = (Options.AllowFPOpFusion == FPOpFusion::Fast || CanFuse || HasFMAD); In this case, UnsafeFPMath is false but isContractable() is true since the FADD node is tagged as 'fast'. A simple...

...static bool isContractable(SDNode *N) { >>>> > SDNodeFlags F = N->getFlags(); >>>> > return F.hasAllowContract() || F.hasAllowReassociation(); >>>> > } >>>> > >>>> > bool CanFuse = Options.UnsafeFPMath || isContractable(N); >>>> > bool AllowFusionGlobally = (Options.AllowFPOpFusion == >>>> > FPOpFusion::Fast || CanFuse || HasFMAD); >>>> > // If the addition is not contractable, do not combine. >>...

...ntractable(SDNode *N) { >>>>> > SDNodeFlags F = N->getFlags(); >>>>> > return F.hasAllowContract() || F.hasAllowReassociation(); >>>>> > } >>>>> > >>>>> > bool CanFuse = Options.UnsafeFPMath || isContractable(N); >>>>> > bool AllowFusionGlobally = (Options.AllowFPOpFusion == >>>>> > FPOpFusion::Fast || CanFuse || HasFMAD); >>>>> > // If the addition is not contractable, do not combi...

...>>>> > return F.hasAllowContract() || >>>> F.hasAllowReassociation(); >>>> > } >>>> > >>>> > bool CanFuse = Options.UnsafeFPMath || >>>> isContractable(N); >>>> > bool AllowFusionGlobally = >>>> (Options.AllowFPOpFusion == >>>> > FPOpFusion::Fast || CanFus...