mirror of
https://github.com/RPCS3/llvm.git
synced 2024-12-15 07:59:57 +00:00
2234dddb07
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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257400 91177308-0d34-0410-b5e6-96231b3b80d8
19 lines
474 B
LLVM
19 lines
474 B
LLVM
; RUN: opt < %s -inline -instcombine -S | FileCheck %s
|
|
|
|
; PR21403: http://llvm.org/bugs/show_bug.cgi?id=21403
|
|
; When the call to sqrtf is replaced by an intrinsic call to fabs,
|
|
; it should not cause a problem in CGSCC.
|
|
|
|
define float @bar(float %f) #0 {
|
|
%mul = fmul fast float %f, %f
|
|
%call1 = call fast float @sqrtf(float %mul)
|
|
ret float %call1
|
|
|
|
; CHECK-LABEL: @bar(
|
|
; CHECK-NEXT: call fast float @llvm.fabs.f32
|
|
; CHECK-NEXT: ret float
|
|
}
|
|
|
|
declare float @sqrtf(float)
|
|
|