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9ac7e74796
This is a continuation of adding FMF to call instructions: http://reviews.llvm.org/rL255555 The intent of the patch is to preserve the current behavior of the transform except that we use the sqrt instruction's 'fast' attribute as a trigger rather than the function-level attribute. But this raises a bug noted by the new FIXME comment. In order to do this transform: sqrt((x * x) * y) ---> fabs(x) * sqrt(y) ...we need all of the sqrt, the first fmul, and the second fmul to be 'fast'. If any of those ops is strict, we should bail out. Differential Revision: http://reviews.llvm.org/D15937 llvm-svn: 257400
19 lines
474 B
LLVM
19 lines
474 B
LLVM
; RUN: opt < %s -inline -instcombine -S | FileCheck %s
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; PR21403: http://llvm.org/bugs/show_bug.cgi?id=21403
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; When the call to sqrtf is replaced by an intrinsic call to fabs,
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; it should not cause a problem in CGSCC.
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define float @bar(float %f) #0 {
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%mul = fmul fast float %f, %f
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%call1 = call fast float @sqrtf(float %mul)
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ret float %call1
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; CHECK-LABEL: @bar(
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; CHECK-NEXT: call fast float @llvm.fabs.f32
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; CHECK-NEXT: ret float
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}
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declare float @sqrtf(float)
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