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TTI: Estimate @llvm.fmuladd cost as fmul + fadd when FMA's aren't legal on the target.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208115 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -487,7 +487,7 @@ unsigned BasicTTI::getIntrinsicInstrCost(Intrinsic::ID IID, Type *RetTy,
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case Intrinsic::round: ISD = ISD::FROUND; break;
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case Intrinsic::pow: ISD = ISD::FPOW; break;
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case Intrinsic::fma: ISD = ISD::FMA; break;
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case Intrinsic::fmuladd: ISD = ISD::FMA; break; // FIXME: mul + add?
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case Intrinsic::fmuladd: ISD = ISD::FMA; break;
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case Intrinsic::lifetime_start:
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case Intrinsic::lifetime_end:
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return 0;
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@ -512,6 +512,12 @@ unsigned BasicTTI::getIntrinsicInstrCost(Intrinsic::ID IID, Type *RetTy,
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return LT.first * 2;
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}
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// If we can't lower fmuladd into an FMA estimate the cost as a floating
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// point mul followed by an add.
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if (IID == Intrinsic::fmuladd)
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return TopTTI->getArithmeticInstrCost(BinaryOperator::FMul, RetTy) +
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TopTTI->getArithmeticInstrCost(BinaryOperator::FAdd, RetTy);
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// Else, assume that we need to scalarize this intrinsic. For math builtins
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// this will emit a costly libcall, adding call overhead and spills. Make it
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// very expensive.
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@ -58,3 +58,31 @@ for.end: ; preds = %vector.body
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}
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declare <4 x float> @llvm.nearbyint.v4f32(<4 x float>) nounwind readnone
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define void @test3(float* nocapture %f, <4 x float> %b, <4 x float> %c) nounwind {
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vector.ph:
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br label %vector.body
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vector.body: ; preds = %vector.body, %vector.ph
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%index = phi i64 [ 0, %vector.ph ], [ %index.next, %vector.body ]
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%0 = getelementptr inbounds float* %f, i64 %index
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%1 = bitcast float* %0 to <4 x float>*
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%wide.load = load <4 x float>* %1, align 4
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%2 = call <4 x float> @llvm.fmuladd.v4f32(<4 x float> %wide.load, <4 x float> %b, <4 x float> %c)
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store <4 x float> %2, <4 x float>* %1, align 4
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%index.next = add i64 %index, 4
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%3 = icmp eq i64 %index.next, 1024
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br i1 %3, label %for.end, label %vector.body
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for.end: ; preds = %vector.body
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ret void
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; CORE2: Printing analysis 'Cost Model Analysis' for function 'test3':
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; CORE2: Cost Model: Found an estimated cost of 4 for instruction: %2 = call <4 x float> @llvm.fmuladd.v4f32(<4 x float> %wide.load, <4 x float> %b, <4 x float> %c)
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; COREI7: Printing analysis 'Cost Model Analysis' for function 'test3':
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; COREI7: Cost Model: Found an estimated cost of 4 for instruction: %2 = call <4 x float> @llvm.fmuladd.v4f32(<4 x float> %wide.load, <4 x float> %b, <4 x float> %c)
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}
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declare <4 x float> @llvm.fmuladd.v4f32(<4 x float>, <4 x float>, <4 x float>) nounwind readnone
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