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TTI: Estimate @llvm.fmuladd cost as fmul + fadd when FMA's aren't legal on the target.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208115 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2014-05-06 18:36:23 +00:00
parent 8a712ba229
commit 2c06cd8612
2 changed files with 35 additions and 1 deletions
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8
lib/CodeGen/BasicTargetTransformInfo.cpp
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@ -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.