mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-23 19:23:23 +01:00
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
|
|
|
|
; With reassociation, constant folding can eliminate the 12 and -12 constants.
|
|
define float @test1(float %arg) {
|
|
; CHECK-LABEL: @test1
|
|
; CHECK-NEXT: fsub fast float -0.000000e+00, %arg
|
|
; CHECK-NEXT: ret float
|
|
|
|
%tmp1 = fsub fast float -1.200000e+01, %arg
|
|
%tmp2 = fadd fast float %tmp1, 1.200000e+01
|
|
ret float %tmp2
|
|
}
|
|
|
|
define float @test2(float %reg109, float %reg1111) {
|
|
; CHECK-LABEL: @test2
|
|
; CHECK-NEXT: fadd float %reg109, -3.000000e+01
|
|
; CHECK-NEXT: fadd float %reg115, %reg1111
|
|
; CHECK-NEXT: fadd float %reg116, 3.000000e+01
|
|
; CHECK-NEXT: ret float
|
|
|
|
%reg115 = fadd float %reg109, -3.000000e+01
|
|
%reg116 = fadd float %reg115, %reg1111
|
|
%reg117 = fadd float %reg116, 3.000000e+01
|
|
ret float %reg117
|
|
}
|
|
|
|
define float @test3(float %reg109, float %reg1111) {
|
|
; CHECK-LABEL: @test3
|
|
; CHECK-NEXT: %reg117 = fadd fast float %reg109, %reg1111
|
|
; CHECK-NEXT: ret float %reg117
|
|
|
|
%reg115 = fadd fast float %reg109, -3.000000e+01
|
|
%reg116 = fadd fast float %reg115, %reg1111
|
|
%reg117 = fadd fast float %reg116, 3.000000e+01
|
|
ret float %reg117
|
|
}
|
|
|
|
@fe = external global float
|
|
@fa = external global float
|
|
@fb = external global float
|
|
@fc = external global float
|
|
@ff = external global float
|
|
|
|
define void @test4() {
|
|
; CHECK-LABEL: @test4
|
|
; CHECK: fadd fast float
|
|
; CHECK: fadd fast float
|
|
; CHECK-NOT: fadd fast float
|
|
; CHECK: ret void
|
|
|
|
%A = load float, float* @fa
|
|
%B = load float, float* @fb
|
|
%C = load float, float* @fc
|
|
%t1 = fadd fast float %A, %B
|
|
%t2 = fadd fast float %t1, %C
|
|
%t3 = fadd fast float %C, %A
|
|
%t4 = fadd fast float %t3, %B
|
|
; e = (a+b)+c;
|
|
store float %t2, float* @fe
|
|
; f = (a+c)+b
|
|
store float %t4, float* @ff
|
|
ret void
|
|
}
|
|
|
|
define void @test5() {
|
|
; CHECK-LABEL: @test5
|
|
; CHECK: fadd fast float
|
|
; CHECK: fadd fast float
|
|
; CHECK-NOT: fadd
|
|
; CHECK: ret void
|
|
|
|
%A = load float, float* @fa
|
|
%B = load float, float* @fb
|
|
%C = load float, float* @fc
|
|
%t1 = fadd fast float %A, %B
|
|
%t2 = fadd fast float %t1, %C
|
|
%t3 = fadd fast float %C, %A
|
|
%t4 = fadd fast float %t3, %B
|
|
; e = c+(a+b)
|
|
store float %t2, float* @fe
|
|
; f = (c+a)+b
|
|
store float %t4, float* @ff
|
|
ret void
|
|
}
|
|
|
|
define void @test6() {
|
|
; CHECK-LABEL: @test6
|
|
; CHECK: fadd fast float
|
|
; CHECK: fadd fast float
|
|
; CHECK-NOT: fadd
|
|
; CHECK: ret void
|
|
|
|
%A = load float, float* @fa
|
|
%B = load float, float* @fb
|
|
%C = load float, float* @fc
|
|
%t1 = fadd fast float %B, %A
|
|
%t2 = fadd fast float %t1, %C
|
|
%t3 = fadd fast float %C, %A
|
|
%t4 = fadd fast float %t3, %B
|
|
; e = c+(b+a)
|
|
store float %t2, float* @fe
|
|
; f = (c+a)+b
|
|
store float %t4, float* @ff
|
|
ret void
|
|
}
|
|
|
|
define float @test7(float %A, float %B, float %C) {
|
|
; CHECK-LABEL: @test7
|
|
; CHECK-NEXT: fadd fast float %C, %B
|
|
; CHECK-NEXT: fmul fast float %A, %A
|
|
; CHECK-NEXT: fmul fast float %tmp3, %tmp2
|
|
; CHECK-NEXT: ret float
|
|
|
|
%aa = fmul fast float %A, %A
|
|
%aab = fmul fast float %aa, %B
|
|
%ac = fmul fast float %A, %C
|
|
%aac = fmul fast float %ac, %A
|
|
%r = fadd fast float %aab, %aac
|
|
ret float %r
|
|
}
|
|
|
|
define float @test8(float %X, float %Y, float %Z) {
|
|
; CHECK-LABEL: @test8
|
|
; CHECK-NEXT: fmul fast float %Y, %X
|
|
; CHECK-NEXT: fsub fast float %Z
|
|
; CHECK-NEXT: ret float
|
|
|
|
%A = fsub fast float 0.0, %X
|
|
%B = fmul fast float %A, %Y
|
|
; (-X)*Y + Z -> Z-X*Y
|
|
%C = fadd fast float %B, %Z
|
|
ret float %C
|
|
}
|
|
|
|
define float @test9(float %X) {
|
|
; CHECK-LABEL: @test9
|
|
; CHECK-NEXT: fmul fast float %X, 9.400000e+01
|
|
; CHECK-NEXT: ret float
|
|
|
|
%Y = fmul fast float %X, 4.700000e+01
|
|
%Z = fadd fast float %Y, %Y
|
|
ret float %Z
|
|
}
|
|
|
|
define float @test10(float %X) {
|
|
; CHECK-LABEL: @test10
|
|
; CHECK-NEXT: fmul fast float %X, 3.000000e+00
|
|
; CHECK-NEXT: ret float
|
|
|
|
%Y = fadd fast float %X ,%X
|
|
%Z = fadd fast float %Y, %X
|
|
ret float %Z
|
|
}
|
|
|
|
define float @test11(float %W) {
|
|
; CHECK-LABEL: test11
|
|
; CHECK-NEXT: fmul fast float %W, 3.810000e+02
|
|
; CHECK-NEXT: ret float
|
|
|
|
%X = fmul fast float %W, 127.0
|
|
%Y = fadd fast float %X ,%X
|
|
%Z = fadd fast float %Y, %X
|
|
ret float %Z
|
|
}
|
|
|
|
define float @test12(float %X) {
|
|
; CHECK-LABEL: @test12
|
|
; CHECK-NEXT: fmul fast float %X, -3.000000e+00
|
|
; CHECK-NEXT: fadd fast float %factor, 6.000000e+00
|
|
; CHECK-NEXT: ret float
|
|
|
|
%A = fsub fast float 1.000000e+00, %X
|
|
%B = fsub fast float 2.000000e+00, %X
|
|
%C = fsub fast float 3.000000e+00, %X
|
|
%Y = fadd fast float %A ,%B
|
|
%Z = fadd fast float %Y, %C
|
|
ret float %Z
|
|
}
|
|
|
|
define float @test13(float %X1, float %X2, float %X3) {
|
|
; CHECK-LABEL: @test13
|
|
; CHECK-NEXT: fsub fast float %X3, %X2
|
|
; CHECK-NEXT: fmul fast float {{.*}}, %X1
|
|
; CHECK-NEXT: ret float
|
|
|
|
%A = fsub fast float 0.000000e+00, %X1
|
|
%B = fmul fast float %A, %X2 ; -X1*X2
|
|
%C = fmul fast float %X1, %X3 ; X1*X3
|
|
%D = fadd fast float %B, %C ; -X1*X2 + X1*X3 -> X1*(X3-X2)
|
|
ret float %D
|
|
}
|
|
|
|
define float @test14(float %X1, float %X2) {
|
|
; CHECK-LABEL: @test14
|
|
; CHECK-NEXT: fsub fast float %X1, %X2
|
|
; CHECK-NEXT: fmul fast float %1, 4.700000e+01
|
|
; CHECK-NEXT: ret float
|
|
|
|
%B = fmul fast float %X1, 47. ; X1*47
|
|
%C = fmul fast float %X2, -47. ; X2*-47
|
|
%D = fadd fast float %B, %C ; X1*47 + X2*-47 -> 47*(X1-X2)
|
|
ret float %D
|
|
}
|
|
|
|
define float @test15(float %arg) {
|
|
; CHECK-LABEL: test15
|
|
; CHECK-NEXT: fmul fast float %arg, 1.440000e+02
|
|
; CHECK-NEXT: ret float %tmp2
|
|
|
|
%tmp1 = fmul fast float 1.200000e+01, %arg
|
|
%tmp2 = fmul fast float %tmp1, 1.200000e+01
|
|
ret float %tmp2
|
|
}
|
|
|
|
; (b+(a+1234))+-a -> b+1234
|
|
define float @test16(float %b, float %a) {
|
|
; CHECK-LABEL: @test16
|
|
; CHECK-NEXT: fadd fast float %b, 1.234000e+03
|
|
; CHECK-NEXT: ret float
|
|
|
|
%1 = fadd fast float %a, 1234.0
|
|
%2 = fadd fast float %b, %1
|
|
%3 = fsub fast float 0.0, %a
|
|
%4 = fadd fast 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: fmul fast float %a, 1.234500e+04
|
|
; CHECK-NEXT: fmul fast float %e, %b
|
|
; CHECK-NEXT: fmul fast float %f, %z
|
|
; CHECK-NEXT: ret float
|
|
|
|
%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 @test18(float %a, float %b, float %z) {
|
|
; CHECK-LABEL: test18
|
|
; CHECK-NEXT: fmul fast float %a, 4.000000e+01
|
|
; CHECK-NEXT: fmul fast float %e, %z
|
|
; CHECK-NEXT: ret float
|
|
|
|
%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
|
|
}
|
|
|
|
; With sub reassociation, constant folding can eliminate the 12 and -12 constants.
|
|
define float @test19(float %A, float %B) {
|
|
; CHECK-LABEL: @test19
|
|
; CHECK-NEXT: fsub fast float %A, %B
|
|
; CHECK-NEXT: ret float
|
|
%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
|
|
}
|
|
|
|
; With sub reassociation, constant folding can eliminate the uses of %a.
|
|
define float @test20(float %a, float %b, float %c) nounwind {
|
|
; CHECK-LABEL: @test20
|
|
; CHECK-NEXT: fsub fast float -0.000000e+00, %b
|
|
; CHECK-NEXT: fsub fast float %b.neg, %c
|
|
; CHECK-NEXT: ret float
|
|
|
|
; FIXME: Should be able to generate the below, which may expose more
|
|
; opportunites for FAdd reassociation.
|
|
; %sum = fadd fast float %c, %b
|
|
; %tmp7 = fsub fast float 0, %sum
|
|
|
|
%tmp3 = fsub fast float %a, %b
|
|
%tmp5 = fsub fast float %tmp3, %c
|
|
%tmp7 = fsub fast float %tmp5, %a
|
|
ret float %tmp7
|
|
}
|