d0cdb2f861
This is a retry of r326502 with updates to the reassociate test file that I missed the first time. @test15_reassoc in the supposed -reassociate test file (except that it tests 2 other passes too...) shows that there's no clear responsiblity for reassociation transforms. Instcombine now gets that case, but only because the constant values are identical. Otherwise, it would still miss that pattern. Reassociate doesn't get that case because it hasn't been updated to use less than 'fast' FMF. llvm-svn: 326513
518 lines
17 KiB
LLVM
518 lines
17 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -reassociate -gvn -instcombine -S | FileCheck %s
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; With reassociation, constant folding can eliminate the 12 and -12 constants.
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define float @test1(float %arg) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: [[ARG_NEG:%.*]] = fsub fast float -0.000000e+00, [[ARG:%.*]]
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; CHECK-NEXT: ret float [[ARG_NEG]]
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;
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%t1 = fsub fast float -1.200000e+01, %arg
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%t2 = fadd fast float %t1, 1.200000e+01
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ret float %t2
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}
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define float @test1_reassoc(float %arg) {
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; CHECK-LABEL: @test1_reassoc(
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; CHECK-NEXT: [[T1:%.*]] = fsub reassoc float -1.200000e+01, [[ARG:%.*]]
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; CHECK-NEXT: [[T2:%.*]] = fadd reassoc float [[T1]], 1.200000e+01
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; CHECK-NEXT: ret float [[T2]]
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;
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%t1 = fsub reassoc float -1.200000e+01, %arg
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%t2 = fadd reassoc float %t1, 1.200000e+01
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ret float %t2
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}
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define float @test2(float %reg109, float %reg1111) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: [[REG115:%.*]] = fadd float [[REG109:%.*]], -3.000000e+01
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; CHECK-NEXT: [[REG116:%.*]] = fadd float [[REG115]], [[REG1111:%.*]]
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; CHECK-NEXT: [[REG117:%.*]] = fadd float [[REG116]], 3.000000e+01
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; CHECK-NEXT: ret float [[REG117]]
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;
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%reg115 = fadd float %reg109, -3.000000e+01
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%reg116 = fadd float %reg115, %reg1111
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%reg117 = fadd float %reg116, 3.000000e+01
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ret float %reg117
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}
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define float @test3(float %reg109, float %reg1111) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: [[REG117:%.*]] = fadd fast float [[REG109:%.*]], [[REG1111:%.*]]
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; CHECK-NEXT: ret float [[REG117]]
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;
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%reg115 = fadd fast float %reg109, -3.000000e+01
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%reg116 = fadd fast float %reg115, %reg1111
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%reg117 = fadd fast float %reg116, 3.000000e+01
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ret float %reg117
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}
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define float @test3_reassoc(float %reg109, float %reg1111) {
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; CHECK-LABEL: @test3_reassoc(
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; CHECK-NEXT: [[REG115:%.*]] = fadd reassoc float [[REG109:%.*]], -3.000000e+01
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; CHECK-NEXT: [[REG116:%.*]] = fadd reassoc float [[REG115]], [[REG1111:%.*]]
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; CHECK-NEXT: [[REG117:%.*]] = fadd reassoc float [[REG116]], 3.000000e+01
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; CHECK-NEXT: ret float [[REG117]]
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;
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%reg115 = fadd reassoc float %reg109, -3.000000e+01
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%reg116 = fadd reassoc float %reg115, %reg1111
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%reg117 = fadd reassoc float %reg116, 3.000000e+01
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ret float %reg117
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}
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@fe = external global float
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@fa = external global float
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@fb = external global float
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@fc = external global float
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@ff = external global float
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define void @test4() {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: [[A:%.*]] = load float, float* @fa, align 4
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; CHECK-NEXT: [[B:%.*]] = load float, float* @fb, align 4
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; CHECK-NEXT: [[C:%.*]] = load float, float* @fc, align 4
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; CHECK-NEXT: [[T1:%.*]] = fadd fast float [[B]], [[A]]
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; CHECK-NEXT: [[T2:%.*]] = fadd fast float [[T1]], [[C]]
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; CHECK-NEXT: store float [[T2]], float* @fe, align 4
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; CHECK-NEXT: store float [[T2]], float* @ff, align 4
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; CHECK-NEXT: ret void
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;
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%A = load float, float* @fa
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%B = load float, float* @fb
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%C = load float, float* @fc
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%t1 = fadd fast float %A, %B
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%t2 = fadd fast float %t1, %C
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%t3 = fadd fast float %C, %A
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%t4 = fadd fast float %t3, %B
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; e = (a+b)+c;
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store float %t2, float* @fe
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; f = (a+c)+b
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store float %t4, float* @ff
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ret void
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}
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define void @test5() {
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: [[A:%.*]] = load float, float* @fa, align 4
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; CHECK-NEXT: [[B:%.*]] = load float, float* @fb, align 4
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; CHECK-NEXT: [[C:%.*]] = load float, float* @fc, align 4
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; CHECK-NEXT: [[T1:%.*]] = fadd fast float [[B]], [[A]]
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; CHECK-NEXT: [[T2:%.*]] = fadd fast float [[T1]], [[C]]
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; CHECK-NEXT: store float [[T2]], float* @fe, align 4
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; CHECK-NEXT: store float [[T2]], float* @ff, align 4
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; CHECK-NEXT: ret void
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;
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%A = load float, float* @fa
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%B = load float, float* @fb
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%C = load float, float* @fc
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%t1 = fadd fast float %A, %B
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%t2 = fadd fast float %t1, %C
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%t3 = fadd fast float %C, %A
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%t4 = fadd fast float %t3, %B
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; e = c+(a+b)
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store float %t2, float* @fe
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; f = (c+a)+b
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store float %t4, float* @ff
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ret void
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}
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define void @test6() {
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; CHECK-LABEL: @test6(
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; CHECK-NEXT: [[A:%.*]] = load float, float* @fa, align 4
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; CHECK-NEXT: [[B:%.*]] = load float, float* @fb, align 4
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; CHECK-NEXT: [[C:%.*]] = load float, float* @fc, align 4
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; CHECK-NEXT: [[T1:%.*]] = fadd fast float [[B]], [[A]]
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; CHECK-NEXT: [[T2:%.*]] = fadd fast float [[T1]], [[C]]
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; CHECK-NEXT: store float [[T2]], float* @fe, align 4
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; CHECK-NEXT: store float [[T2]], float* @ff, align 4
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; CHECK-NEXT: ret void
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;
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%A = load float, float* @fa
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%B = load float, float* @fb
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%C = load float, float* @fc
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%t1 = fadd fast float %B, %A
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%t2 = fadd fast float %t1, %C
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%t3 = fadd fast float %C, %A
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%t4 = fadd fast float %t3, %B
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; e = c+(b+a)
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store float %t2, float* @fe
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; f = (c+a)+b
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store float %t4, float* @ff
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ret void
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}
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define float @test7(float %A, float %B, float %C) {
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; CHECK-LABEL: @test7(
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; CHECK-NEXT: [[REASS_ADD1:%.*]] = fadd fast float [[C:%.*]], [[B:%.*]]
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; CHECK-NEXT: [[REASS_MUL2:%.*]] = fmul fast float [[A:%.*]], [[A]]
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; CHECK-NEXT: [[REASS_MUL:%.*]] = fmul fast float [[REASS_MUL2]], [[REASS_ADD1]]
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; CHECK-NEXT: ret float [[REASS_MUL]]
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;
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%aa = fmul fast float %A, %A
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%aab = fmul fast float %aa, %B
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%ac = fmul fast float %A, %C
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%aac = fmul fast float %ac, %A
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%r = fadd fast float %aab, %aac
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ret float %r
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}
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define float @test7_reassoc(float %A, float %B, float %C) {
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; CHECK-LABEL: @test7_reassoc(
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; CHECK-NEXT: [[AA:%.*]] = fmul reassoc float [[A:%.*]], [[A]]
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; CHECK-NEXT: [[AAB:%.*]] = fmul reassoc float [[AA]], [[B:%.*]]
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; CHECK-NEXT: [[TMP1:%.*]] = fmul reassoc float [[A]], [[A]]
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; CHECK-NEXT: [[AAC:%.*]] = fmul reassoc float [[TMP1]], [[C:%.*]]
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; CHECK-NEXT: [[R:%.*]] = fadd reassoc float [[AAB]], [[AAC]]
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; CHECK-NEXT: ret float [[R]]
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;
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%aa = fmul reassoc float %A, %A
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%aab = fmul reassoc float %aa, %B
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%ac = fmul reassoc float %A, %C
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%aac = fmul reassoc float %ac, %A
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%r = fadd reassoc float %aab, %aac
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ret float %r
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}
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; (-X)*Y + Z -> Z-X*Y
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define float @test8(float %X, float %Y, float %Z) {
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; CHECK-LABEL: @test8(
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; CHECK-NEXT: [[A:%.*]] = fmul fast float [[Y:%.*]], [[X:%.*]]
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; CHECK-NEXT: [[C:%.*]] = fsub fast float [[Z:%.*]], [[A]]
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; CHECK-NEXT: ret float [[C]]
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;
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%A = fsub fast float 0.0, %X
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%B = fmul fast float %A, %Y
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%C = fadd fast float %B, %Z
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ret float %C
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}
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define float @test8_reassoc(float %X, float %Y, float %Z) {
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; CHECK-LABEL: @test8_reassoc(
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; CHECK-NEXT: [[A:%.*]] = fsub reassoc float 0.000000e+00, [[X:%.*]]
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; CHECK-NEXT: [[B:%.*]] = fmul reassoc float [[A]], [[Y:%.*]]
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; CHECK-NEXT: [[C:%.*]] = fadd reassoc float [[B]], [[Z:%.*]]
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; CHECK-NEXT: ret float [[C]]
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;
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%A = fsub reassoc float 0.0, %X
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%B = fmul reassoc float %A, %Y
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%C = fadd reassoc float %B, %Z
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ret float %C
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}
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define float @test9(float %X) {
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; CHECK-LABEL: @test9(
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; CHECK-NEXT: [[FACTOR:%.*]] = fmul fast float [[X:%.*]], 9.400000e+01
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; CHECK-NEXT: ret float [[FACTOR]]
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;
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%Y = fmul fast float %X, 4.700000e+01
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%Z = fadd fast float %Y, %Y
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ret float %Z
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}
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define float @test9_reassoc(float %X) {
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; CHECK-LABEL: @test9_reassoc(
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; CHECK-NEXT: [[Y:%.*]] = fmul reassoc float [[X:%.*]], 4.700000e+01
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; CHECK-NEXT: [[Z:%.*]] = fadd reassoc float [[Y]], [[Y]]
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; CHECK-NEXT: ret float [[Z]]
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;
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%Y = fmul reassoc float %X, 4.700000e+01
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%Z = fadd reassoc float %Y, %Y
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ret float %Z
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}
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define float @test10(float %X) {
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; CHECK-LABEL: @test10(
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; CHECK-NEXT: [[FACTOR:%.*]] = fmul fast float [[X:%.*]], 3.000000e+00
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; CHECK-NEXT: ret float [[FACTOR]]
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;
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%Y = fadd fast float %X ,%X
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%Z = fadd fast float %Y, %X
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ret float %Z
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}
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define float @test10_reassoc(float %X) {
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; CHECK-LABEL: @test10_reassoc(
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; CHECK-NEXT: [[Y:%.*]] = fadd reassoc float [[X:%.*]], [[X]]
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; CHECK-NEXT: [[Z:%.*]] = fadd reassoc float [[Y]], [[X]]
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; CHECK-NEXT: ret float [[Z]]
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;
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%Y = fadd reassoc float %X ,%X
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%Z = fadd reassoc float %Y, %X
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ret float %Z
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}
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define float @test11(float %W) {
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; CHECK-LABEL: @test11(
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; CHECK-NEXT: [[FACTOR:%.*]] = fmul fast float [[W:%.*]], 3.810000e+02
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; CHECK-NEXT: ret float [[FACTOR]]
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;
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%X = fmul fast float %W, 127.0
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%Y = fadd fast float %X ,%X
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%Z = fadd fast float %Y, %X
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ret float %Z
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}
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define float @test11_reassoc(float %W) {
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; CHECK-LABEL: @test11_reassoc(
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; CHECK-NEXT: [[X:%.*]] = fmul reassoc float [[W:%.*]], 1.270000e+02
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; CHECK-NEXT: [[Y:%.*]] = fadd reassoc float [[X]], [[X]]
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; CHECK-NEXT: [[Z:%.*]] = fadd reassoc float [[X]], [[Y]]
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; CHECK-NEXT: ret float [[Z]]
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;
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%X = fmul reassoc float %W, 127.0
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%Y = fadd reassoc float %X ,%X
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%Z = fadd reassoc float %Y, %X
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ret float %Z
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}
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define float @test12(float %X) {
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; CHECK-LABEL: @test12(
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; CHECK-NEXT: [[FACTOR:%.*]] = fmul fast float [[X:%.*]], -3.000000e+00
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; CHECK-NEXT: [[Z:%.*]] = fadd fast float [[FACTOR]], 6.000000e+00
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; CHECK-NEXT: ret float [[Z]]
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;
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%A = fsub fast float 1.000000e+00, %X
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%B = fsub fast float 2.000000e+00, %X
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%C = fsub fast float 3.000000e+00, %X
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%Y = fadd fast float %A ,%B
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%Z = fadd fast float %Y, %C
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ret float %Z
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}
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define float @test12_reassoc(float %X) {
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; CHECK-LABEL: @test12_reassoc(
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; CHECK-NEXT: [[A:%.*]] = fsub reassoc float 1.000000e+00, [[X:%.*]]
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; CHECK-NEXT: [[B:%.*]] = fsub reassoc float 2.000000e+00, [[X]]
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; CHECK-NEXT: [[C:%.*]] = fsub reassoc float 3.000000e+00, [[X]]
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; CHECK-NEXT: [[Y:%.*]] = fadd reassoc float [[A]], [[B]]
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; CHECK-NEXT: [[Z:%.*]] = fadd reassoc float [[C]], [[Y]]
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; CHECK-NEXT: ret float [[Z]]
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;
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%A = fsub reassoc float 1.000000e+00, %X
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%B = fsub reassoc float 2.000000e+00, %X
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%C = fsub reassoc float 3.000000e+00, %X
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%Y = fadd reassoc float %A ,%B
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%Z = fadd reassoc float %Y, %C
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ret float %Z
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}
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define float @test13(float %X1, float %X2, float %X3) {
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; CHECK-LABEL: @test13(
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; CHECK-NEXT: [[REASS_ADD:%.*]] = fsub fast float [[X3:%.*]], [[X2:%.*]]
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; CHECK-NEXT: [[REASS_MUL:%.*]] = fmul fast float [[REASS_ADD]], [[X1:%.*]]
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; CHECK-NEXT: ret float [[REASS_MUL]]
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;
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%A = fsub fast float 0.000000e+00, %X1
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%B = fmul fast float %A, %X2 ; -X1*X2
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%C = fmul fast float %X1, %X3 ; X1*X3
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%D = fadd fast float %B, %C ; -X1*X2 + X1*X3 -> X1*(X3-X2)
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ret float %D
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}
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define float @test13_reassoc(float %X1, float %X2, float %X3) {
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; CHECK-LABEL: @test13_reassoc(
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; CHECK-NEXT: [[A:%.*]] = fsub reassoc float 0.000000e+00, [[X1:%.*]]
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; CHECK-NEXT: [[B:%.*]] = fmul reassoc float [[A]], [[X2:%.*]]
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; CHECK-NEXT: [[C:%.*]] = fmul reassoc float [[X1]], [[X3:%.*]]
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; CHECK-NEXT: [[D:%.*]] = fadd reassoc float [[B]], [[C]]
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; CHECK-NEXT: ret float [[D]]
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;
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%A = fsub reassoc float 0.000000e+00, %X1
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%B = fmul reassoc float %A, %X2 ; -X1*X2
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%C = fmul reassoc float %X1, %X3 ; X1*X3
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%D = fadd reassoc float %B, %C ; -X1*X2 + X1*X3 -> X1*(X3-X2)
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ret float %D
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}
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define float @test14(float %X1, float %X2) {
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; CHECK-LABEL: @test14(
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; CHECK-NEXT: [[TMP1:%.*]] = fsub fast float [[X1:%.*]], [[X2:%.*]]
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; CHECK-NEXT: [[TMP2:%.*]] = fmul fast float [[TMP1]], 4.700000e+01
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; CHECK-NEXT: ret float [[TMP2]]
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;
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%B = fmul fast float %X1, 47. ; X1*47
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%C = fmul fast float %X2, -47. ; X2*-47
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%D = fadd fast float %B, %C ; X1*47 + X2*-47 -> 47*(X1-X2)
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ret float %D
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}
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define float @test14_reassoc(float %X1, float %X2) {
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; CHECK-LABEL: @test14_reassoc(
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; CHECK-NEXT: [[B:%.*]] = fmul reassoc float [[X1:%.*]], 4.700000e+01
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; CHECK-NEXT: [[C:%.*]] = fmul reassoc float [[X2:%.*]], 4.700000e+01
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; CHECK-NEXT: [[D1:%.*]] = fsub reassoc float [[B]], [[C]]
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; CHECK-NEXT: ret float [[D1]]
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;
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%B = fmul reassoc float %X1, 47. ; X1*47
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%C = fmul reassoc float %X2, -47. ; X2*-47
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%D = fadd reassoc float %B, %C ; X1*47 + X2*-47 -> 47*(X1-X2)
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ret float %D
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}
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define float @test15(float %arg) {
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; CHECK-LABEL: @test15(
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; CHECK-NEXT: [[T2:%.*]] = fmul fast float [[ARG:%.*]], 1.440000e+02
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; CHECK-NEXT: ret float [[T2]]
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;
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%t1 = fmul fast float 1.200000e+01, %arg
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%t2 = fmul fast float %t1, 1.200000e+01
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ret float %t2
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}
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define float @test15_reassoc(float %arg) {
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; CHECK-LABEL: @test15_reassoc(
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; CHECK-NEXT: [[T2:%.*]] = fmul reassoc float [[ARG:%.*]], 1.440000e+02
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; CHECK-NEXT: ret float [[T2]]
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;
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%t1 = fmul reassoc float 1.200000e+01, %arg
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%t2 = fmul reassoc float %t1, 1.200000e+01
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ret float %t2
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}
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; (b+(a+1234))+-a -> b+1234
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define float @test16(float %b, float %a) {
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; CHECK-LABEL: @test16(
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; CHECK-NEXT: [[TMP1:%.*]] = fadd fast float [[B:%.*]], 1.234000e+03
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; CHECK-NEXT: ret float [[TMP1]]
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;
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%1 = fadd fast float %a, 1234.0
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%2 = fadd fast float %b, %1
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%3 = fsub fast float 0.0, %a
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%4 = fadd fast float %2, %3
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ret float %4
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}
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define float @test16_reassoc(float %b, float %a) {
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; CHECK-LABEL: @test16_reassoc(
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; CHECK-NEXT: [[TMP1:%.*]] = fadd reassoc float [[A:%.*]], 1.234000e+03
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; CHECK-NEXT: [[TMP2:%.*]] = fadd reassoc float [[TMP1]], [[B:%.*]]
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; CHECK-NEXT: [[TMP3:%.*]] = fsub reassoc float 0.000000e+00, [[A]]
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; CHECK-NEXT: [[TMP4:%.*]] = fadd reassoc float [[TMP3]], [[TMP2]]
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; CHECK-NEXT: ret float [[TMP4]]
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;
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%1 = fadd reassoc float %a, 1234.0
|
|
%2 = fadd reassoc float %b, %1
|
|
%3 = fsub reassoc float 0.0, %a
|
|
%4 = fadd reassoc float %2, %3
|
|
ret float %4
|
|
}
|
|
|
|
; Test that we can turn things like X*-(Y*Z) -> X*-1*Y*Z.
|
|
|
|
define float @test17(float %a, float %b, float %z) {
|
|
; CHECK-LABEL: @test17(
|
|
; CHECK-NEXT: [[E:%.*]] = fmul fast float [[A:%.*]], 1.234500e+04
|
|
; CHECK-NEXT: [[F:%.*]] = fmul fast float [[E]], [[B:%.*]]
|
|
; CHECK-NEXT: [[G:%.*]] = fmul fast float [[F]], [[Z:%.*]]
|
|
; CHECK-NEXT: ret float [[G]]
|
|
;
|
|
%c = fsub fast float 0.000000e+00, %z
|
|
%d = fmul fast float %a, %b
|
|
%e = fmul fast float %c, %d
|
|
%f = fmul fast float %e, 1.234500e+04
|
|
%g = fsub fast float 0.000000e+00, %f
|
|
ret float %g
|
|
}
|
|
|
|
define float @test17_reassoc(float %a, float %b, float %z) {
|
|
; CHECK-LABEL: @test17_reassoc(
|
|
; CHECK-NEXT: [[C:%.*]] = fsub reassoc float 0.000000e+00, [[Z:%.*]]
|
|
; CHECK-NEXT: [[D:%.*]] = fmul reassoc float [[A:%.*]], [[B:%.*]]
|
|
; CHECK-NEXT: [[E:%.*]] = fmul reassoc float [[D]], [[C]]
|
|
; CHECK-NEXT: [[F:%.*]] = fmul reassoc float [[E]], 1.234500e+04
|
|
; CHECK-NEXT: [[G:%.*]] = fsub reassoc float 0.000000e+00, [[F]]
|
|
; CHECK-NEXT: ret float [[G]]
|
|
;
|
|
%c = fsub reassoc float 0.000000e+00, %z
|
|
%d = fmul reassoc float %a, %b
|
|
%e = fmul reassoc float %c, %d
|
|
%f = fmul reassoc float %e, 1.234500e+04
|
|
%g = fsub reassoc float 0.000000e+00, %f
|
|
ret float %g
|
|
}
|
|
|
|
define float @test18(float %a, float %b, float %z) {
|
|
; CHECK-LABEL: @test18(
|
|
; CHECK-NEXT: [[E:%.*]] = fmul fast float [[A:%.*]], 4.000000e+01
|
|
; CHECK-NEXT: [[F:%.*]] = fmul fast float [[E]], [[Z:%.*]]
|
|
; CHECK-NEXT: ret float [[F]]
|
|
;
|
|
%d = fmul fast float %z, 4.000000e+01
|
|
%c = fsub fast float 0.000000e+00, %d
|
|
%e = fmul fast float %a, %c
|
|
%f = fsub fast float 0.000000e+00, %e
|
|
ret float %f
|
|
}
|
|
|
|
define float @test18_reassoc(float %a, float %b, float %z) {
|
|
; CHECK-LABEL: @test18_reassoc(
|
|
; CHECK-NEXT: [[D:%.*]] = fmul reassoc float [[Z:%.*]], 4.000000e+01
|
|
; CHECK-NEXT: [[C:%.*]] = fsub reassoc float 0.000000e+00, [[D]]
|
|
; CHECK-NEXT: [[E:%.*]] = fmul reassoc float [[C]], [[A:%.*]]
|
|
; CHECK-NEXT: [[F:%.*]] = fsub reassoc float 0.000000e+00, [[E]]
|
|
; CHECK-NEXT: ret float [[F]]
|
|
;
|
|
%d = fmul reassoc float %z, 4.000000e+01
|
|
%c = fsub reassoc float 0.000000e+00, %d
|
|
%e = fmul reassoc float %a, %c
|
|
%f = fsub reassoc float 0.000000e+00, %e
|
|
ret float %f
|
|
}
|
|
|
|
; With sub reassociation, constant folding can eliminate the 12 and -12 constants.
|
|
define float @test19(float %A, float %B) {
|
|
; CHECK-LABEL: @test19(
|
|
; CHECK-NEXT: [[Z:%.*]] = fsub fast float [[A:%.*]], [[B:%.*]]
|
|
; CHECK-NEXT: ret float [[Z]]
|
|
;
|
|
%X = fadd fast float -1.200000e+01, %A
|
|
%Y = fsub fast float %X, %B
|
|
%Z = fadd fast float %Y, 1.200000e+01
|
|
ret float %Z
|
|
}
|
|
|
|
define float @test19_reassoc(float %A, float %B) {
|
|
; CHECK-LABEL: @test19_reassoc(
|
|
; CHECK-NEXT: [[X:%.*]] = fadd reassoc float [[A:%.*]], -1.200000e+01
|
|
; CHECK-NEXT: [[Y:%.*]] = fsub reassoc float [[X]], [[B:%.*]]
|
|
; CHECK-NEXT: [[Z:%.*]] = fadd reassoc float [[Y]], 1.200000e+01
|
|
; CHECK-NEXT: ret float [[Z]]
|
|
;
|
|
%X = fadd reassoc float -1.200000e+01, %A
|
|
%Y = fsub reassoc float %X, %B
|
|
%Z = fadd reassoc float %Y, 1.200000e+01
|
|
ret float %Z
|
|
}
|
|
|
|
; With sub reassociation, constant folding can eliminate the uses of %a.
|
|
define float @test20(float %a, float %b, float %c) nounwind {
|
|
; FIXME: Should be able to generate the below, which may expose more
|
|
; opportunites for FAdd reassociation.
|
|
; %sum = fadd fast float %c, %b
|
|
; %t7 = fsub fast float 0, %sum
|
|
; CHECK-LABEL: @test20(
|
|
; CHECK-NEXT: [[B_NEG:%.*]] = fsub fast float -0.000000e+00, [[B:%.*]]
|
|
; CHECK-NEXT: [[T7:%.*]] = fsub fast float [[B_NEG]], [[C:%.*]]
|
|
; CHECK-NEXT: ret float [[T7]]
|
|
;
|
|
%t3 = fsub fast float %a, %b
|
|
%t5 = fsub fast float %t3, %c
|
|
%t7 = fsub fast float %t5, %a
|
|
ret float %t7
|
|
}
|
|
|
|
define float @test20_reassoc(float %a, float %b, float %c) nounwind {
|
|
; CHECK-LABEL: @test20_reassoc(
|
|
; CHECK-NEXT: [[T3:%.*]] = fsub reassoc float [[A:%.*]], [[B:%.*]]
|
|
; CHECK-NEXT: [[T5:%.*]] = fsub reassoc float [[T3]], [[C:%.*]]
|
|
; CHECK-NEXT: [[T7:%.*]] = fsub reassoc float [[T5]], [[A]]
|
|
; CHECK-NEXT: ret float [[T7]]
|
|
;
|
|
%t3 = fsub reassoc float %a, %b
|
|
%t5 = fsub reassoc float %t3, %c
|
|
%t7 = fsub reassoc float %t5, %a
|
|
ret float %t7
|
|
}
|
|
|