1 ; RUN: opt < %s -reassociate -constprop -instcombine -S | FileCheck %s
3 define float @test1(float %A, float %B) {
5 ; CHECK-NEXT: %W = fadd float %B, 5.000000e+00
6 ; CHECK-NEXT: %X = fadd float %A, -7.000000e+00
7 ; CHECK-NEXT: %Y = fsub float %X, %W
8 ; CHECK-NEXT: %Z = fadd float %Y, 1.200000e+01
9 ; CHECK-NEXT: ret float %Z
11 %W = fadd float 5.0, %B
12 %X = fadd float -7.0, %A
13 %Y = fsub float %X, %W
14 %Z = fadd float %Y, 12.0
18 ; With sub reassociation, constant folding can eliminate all of the constants.
19 define float @test2(float %A, float %B) {
21 ; CHECK-NEXT: %Z = fsub fast float %A, %B
22 ; CHECK-NEXT: ret float %Z
24 %W = fadd fast float %B, 5.000000e+00
25 %X = fadd fast float %A, -7.000000e+00
26 %Y = fsub fast float %X, %W
27 %Z = fadd fast float %Y, 1.200000e+01
32 define float @test3(float %A, float %B, float %C, float %D) {
34 ; CHECK-NEXT: %M = fadd float %A, 1.200000e+01
35 ; CHECK-NEXT: %N = fadd float %M, %B
36 ; CHECK-NEXT: %O = fadd float %N, %C
37 ; CHECK-NEXT: %P = fsub float %D, %O
38 ; CHECK-NEXT: %Q = fadd float %P, 1.200000e+01
39 ; CHECK-NEXT: ret float %Q
41 %M = fadd float %A, 1.200000e+01
42 %N = fadd float %M, %B
43 %O = fadd float %N, %C
44 %P = fsub float %D, %O
45 %Q = fadd float %P, 1.200000e+01
49 ; With sub reassociation, constant folding can eliminate the two 12 constants.
50 define float @test4(float %A, float %B, float %C, float %D) {
52 ; CHECK-NEXT: %B.neg = fsub fast float -0.000000e+00, %B
53 ; CHECK-NEXT: %O.neg = fsub fast float %B.neg, %A
54 ; CHECK-NEXT: %P = fsub fast float %O.neg, %C
55 ; CHECK-NEXT: %Q = fadd fast float %P, %D
56 ; CHECK-NEXT: ret float %Q
58 ; FIXME: InstCombine should be able to get us to the following:
59 ; %sum = fadd fast float %B, %A
60 ; %sum1 = fadd fast float %sum, %C
61 ; %Q = fsub fast float %D, %sum1
64 %M = fadd fast float 1.200000e+01, %A
65 %N = fadd fast float %M, %B
66 %O = fadd fast float %N, %C
67 %P = fsub fast float %D, %O
68 %Q = fadd fast float 1.200000e+01, %P