8b2f27ce3a
These simplifications were previously enabled only with isFast(), but that is more restrictive than required. Since r317488, FMF has 'reassoc' to control these cases at a finer level. llvm-svn: 330089
40 lines
1.2 KiB
LLVM
40 lines
1.2 KiB
LLVM
; RUN: opt < %s -reassociate -instcombine -S | FileCheck %s
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define float @test1(float %A, float %B) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: [[Z:%.*]] = fadd fast float %A, %B
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; CHECK-NEXT: ret float [[Z]]
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;
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%W = fadd fast float %B, -5.0
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%Y = fadd fast float %A, 5.0
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%Z = fadd fast float %W, %Y
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ret float %Z
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}
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; Check again using minimal subset of FMF.
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; Both 'reassoc' and 'nsz' are required.
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define float @test1_reassoc_nsz(float %A, float %B) {
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; CHECK-LABEL: @test1_reassoc_nsz(
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; CHECK-NEXT: [[Z:%.*]] = fadd reassoc nsz float %A, %B
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; CHECK-NEXT: ret float [[Z]]
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;
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%W = fadd reassoc nsz float %B, -5.0
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%Y = fadd reassoc nsz float %A, 5.0
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%Z = fadd reassoc nsz float %W, %Y
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ret float %Z
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}
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; Verify the fold is not done with only 'reassoc' ('nsz' is required).
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define float @test1_reassoc(float %A, float %B) {
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; CHECK-LABEL: @test1_reassoc(
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; CHECK-NEXT: [[W:%.*]] = fadd reassoc float %B, -5.000000e+00
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; CHECK-NEXT: [[Y:%.*]] = fadd reassoc float %A, 5.000000e+00
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; CHECK-NEXT: [[Z:%.*]] = fadd reassoc float [[Y]], [[W]]
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; CHECK-NEXT: ret float [[Z]]
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;
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%W = fadd reassoc float %B, -5.0
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%Y = fadd reassoc float %A, 5.0
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%Z = fadd reassoc float %W, %Y
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ret float %Z
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}
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