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979ed44feb
turning (fptrunc (sqrt (fpext x))) -> (sqrtf x) is great, but we have to delete the original sqrt as well. Not doing so causes us to do two sqrt's when building with -fmath-errno (the default on linux). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113260 91177308-0d34-0410-b5e6-96231b3b80d8
33 lines
915 B
LLVM
33 lines
915 B
LLVM
; RUN: opt -S -instcombine %s | FileCheck %s
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define float @test1(float %x) nounwind readnone ssp {
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entry:
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; CHECK: @test1
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; CHECK-NOT: fpext
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; CHECK-NOT: sqrt(
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; CHECK: sqrtf(
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; CHECK-NOT: fptrunc
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%conv = fpext float %x to double ; <double> [#uses=1]
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%call = tail call double @sqrt(double %conv) readnone nounwind ; <double> [#uses=1]
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%conv1 = fptrunc double %call to float ; <float> [#uses=1]
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; CHECK: ret float
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ret float %conv1
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}
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declare double @sqrt(double)
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; PR8096
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define float @test2(float %x) nounwind readnone ssp {
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entry:
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; CHECK: @test2
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; CHECK-NOT: fpext
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; CHECK-NOT: sqrt(
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; CHECK: sqrtf(
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; CHECK-NOT: fptrunc
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%conv = fpext float %x to double ; <double> [#uses=1]
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%call = tail call double @sqrt(double %conv) nounwind ; <double> [#uses=1]
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%conv1 = fptrunc double %call to float ; <float> [#uses=1]
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; CHECK: ret float
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ret float %conv1
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}
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