diff options
Diffstat (limited to 'llvm/lib/CodeGen/BasicTargetTransformInfo.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/BasicTargetTransformInfo.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/BasicTargetTransformInfo.cpp b/llvm/lib/CodeGen/BasicTargetTransformInfo.cpp index 6ad1f28bb25..4b895092d3b 100644 --- a/llvm/lib/CodeGen/BasicTargetTransformInfo.cpp +++ b/llvm/lib/CodeGen/BasicTargetTransformInfo.cpp @@ -487,7 +487,7 @@ unsigned BasicTTI::getIntrinsicInstrCost(Intrinsic::ID IID, Type *RetTy, case Intrinsic::round: ISD = ISD::FROUND; break; case Intrinsic::pow: ISD = ISD::FPOW; break; case Intrinsic::fma: ISD = ISD::FMA; break; - case Intrinsic::fmuladd: ISD = ISD::FMA; break; // FIXME: mul + add? + case Intrinsic::fmuladd: ISD = ISD::FMA; break; case Intrinsic::lifetime_start: case Intrinsic::lifetime_end: return 0; @@ -512,6 +512,12 @@ unsigned BasicTTI::getIntrinsicInstrCost(Intrinsic::ID IID, Type *RetTy, return LT.first * 2; } + // If we can't lower fmuladd into an FMA estimate the cost as a floating + // point mul followed by an add. + if (IID == Intrinsic::fmuladd) + return TopTTI->getArithmeticInstrCost(BinaryOperator::FMul, RetTy) + + TopTTI->getArithmeticInstrCost(BinaryOperator::FAdd, RetTy); + // Else, assume that we need to scalarize this intrinsic. For math builtins // this will emit a costly libcall, adding call overhead and spills. Make it // very expensive. |
