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4d5ef8fb85
We sometimes create intermediate subtract instructions during reassociation. Adding these to the worklist to revisit exposes many additional reassociation opportunities. Patch by Aditya Nandakumar. llvm-svn: 253240
286 lines
7.2 KiB
LLVM
286 lines
7.2 KiB
LLVM
; 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: fsub fast float -0.000000e+00, %arg
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; CHECK-NEXT: ret float
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%tmp1 = fsub fast float -1.200000e+01, %arg
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%tmp2 = fadd fast float %tmp1, 1.200000e+01
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ret float %tmp2
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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: fadd float %reg109, -3.000000e+01
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; CHECK-NEXT: fadd float %reg115, %reg1111
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; CHECK-NEXT: fadd float %reg116, 3.000000e+01
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; CHECK-NEXT: ret float
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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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%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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@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: fadd fast float
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; CHECK: fadd fast float
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; CHECK-NOT: fadd fast float
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; CHECK: ret void
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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: fadd fast float
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; CHECK: fadd fast float
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; CHECK-NOT: fadd
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; CHECK: ret void
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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: fadd fast float
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; CHECK: fadd fast float
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; CHECK-NOT: fadd
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; CHECK: ret void
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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: fadd fast float %C, %B
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; CHECK-NEXT: fmul fast float %A, %A
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; CHECK-NEXT: fmul fast float %tmp3, %tmp2
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; CHECK-NEXT: ret float
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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 @test8(float %X, float %Y, float %Z) {
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; CHECK-LABEL: @test8
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; CHECK-NEXT: fmul fast float %Y, %X
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; CHECK-NEXT: fsub fast float %Z
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; CHECK-NEXT: ret float
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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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; (-X)*Y + Z -> Z-X*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 @test9(float %X) {
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; CHECK-LABEL: @test9
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; CHECK-NEXT: fmul fast float %X, 9.400000e+01
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; CHECK-NEXT: ret float
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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 @test10(float %X) {
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; CHECK-LABEL: @test10
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; CHECK-NEXT: fmul fast float %X, 3.000000e+00
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; CHECK-NEXT: ret float
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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(float %W) {
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; CHECK-LABEL: test11
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; CHECK-NEXT: fmul fast float %W, 3.810000e+02
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; CHECK-NEXT: ret float
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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 @test12(float %X) {
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; CHECK-LABEL: @test12
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; CHECK-NEXT: fmul fast float %X, -3.000000e+00
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; CHECK-NEXT: fadd fast float %factor, 6.000000e+00
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; CHECK-NEXT: ret float
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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 @test13(float %X1, float %X2, float %X3) {
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; CHECK-LABEL: @test13
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; CHECK-NEXT: fsub fast float %X3, %X2
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; CHECK-NEXT: fmul fast float {{.*}}, %X1
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; CHECK-NEXT: ret float
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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 @test14(float %X1, float %X2) {
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; CHECK-LABEL: @test14
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; CHECK-NEXT: fsub fast float %X1, %X2
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; CHECK-NEXT: fmul fast float %1, 4.700000e+01
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; CHECK-NEXT: ret float
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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 @test15(float %arg) {
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; CHECK-LABEL: test15
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; CHECK-NEXT: fmul fast float %arg, 1.440000e+02
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; CHECK-NEXT: ret float %tmp2
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%tmp1 = fmul fast float 1.200000e+01, %arg
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%tmp2 = fmul fast float %tmp1, 1.200000e+01
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ret float %tmp2
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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: fadd fast float %b, 1.234000e+03
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; CHECK-NEXT: ret float
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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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; Test that we can turn things like X*-(Y*Z) -> X*-1*Y*Z.
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define float @test17(float %a, float %b, float %z) {
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; CHECK-LABEL: test17
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; CHECK-NEXT: fmul fast float %a, 1.234500e+04
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; CHECK-NEXT: fmul fast float %e, %b
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; CHECK-NEXT: fmul fast float %f, %z
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; CHECK-NEXT: ret float
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%c = fsub fast float 0.000000e+00, %z
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%d = fmul fast float %a, %b
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%e = fmul fast float %c, %d
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%f = fmul fast float %e, 1.234500e+04
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%g = fsub fast float 0.000000e+00, %f
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ret float %g
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}
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define float @test18(float %a, float %b, float %z) {
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; CHECK-LABEL: test18
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; CHECK-NEXT: fmul fast float %a, 4.000000e+01
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; CHECK-NEXT: fmul fast float %e, %z
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; CHECK-NEXT: ret float
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%d = fmul fast float %z, 4.000000e+01
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%c = fsub fast float 0.000000e+00, %d
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%e = fmul fast float %a, %c
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%f = fsub fast float 0.000000e+00, %e
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ret float %f
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}
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; With sub reassociation, constant folding can eliminate the 12 and -12 constants.
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define float @test19(float %A, float %B) {
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; CHECK-LABEL: @test19
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; CHECK-NEXT: fsub fast float %A, %B
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; CHECK-NEXT: ret float
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%X = fadd fast float -1.200000e+01, %A
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%Y = fsub fast float %X, %B
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%Z = fadd fast float %Y, 1.200000e+01
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ret float %Z
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}
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; With sub reassociation, constant folding can eliminate the uses of %a.
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define float @test20(float %a, float %b, float %c) nounwind {
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; CHECK-LABEL: @test20
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; CHECK-NEXT: fsub fast float -0.000000e+00, %b
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; CHECK-NEXT: fsub fast float %b.neg, %c
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; CHECK-NEXT: ret float
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; FIXME: Should be able to generate the below, which may expose more
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; opportunites for FAdd reassociation.
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; %sum = fadd fast float %c, %b
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; %tmp7 = fsub fast float 0, %sum
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%tmp3 = fsub fast float %a, %b
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%tmp5 = fsub fast float %tmp3, %c
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%tmp7 = fsub fast float %tmp5, %a
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ret float %tmp7
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}
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