1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -reassociate -constprop -instcombine -S | FileCheck %s
3
4define float @test1(float %A, float %B) {
5; CHECK-LABEL: @test1(
6; CHECK-NEXT:    [[W:%.*]] = fadd float [[B:%.*]], 5.000000e+00
7; CHECK-NEXT:    [[X:%.*]] = fadd float [[A:%.*]], -7.000000e+00
8; CHECK-NEXT:    [[Y:%.*]] = fsub float [[X]], [[W]]
9; CHECK-NEXT:    [[Z:%.*]] = fadd float [[Y]], 1.200000e+01
10; CHECK-NEXT:    ret float [[Z]]
11;
12  %W = fadd float 5.0, %B
13  %X = fadd float -7.0, %A
14  %Y = fsub float %X, %W
15  %Z = fadd float %Y, 12.0
16  ret float %Z
17}
18
19; With sub reassociation, constant folding can eliminate all of the constants.
20define float @test2(float %A, float %B) {
21; CHECK-LABEL: @test2(
22; CHECK-NEXT:    [[Z:%.*]] = fsub fast float [[A:%.*]], [[B:%.*]]
23; CHECK-NEXT:    ret float [[Z]]
24;
25  %W = fadd fast float %B, 5.000000e+00
26  %X = fadd fast float %A, -7.000000e+00
27  %Y = fsub fast float %X, %W
28  %Z = fadd fast float %Y, 1.200000e+01
29  ret float %Z
30}
31
32; Check again using minimal subset of FMF.
33; Both 'reassoc' and 'nsz' are required.
34define float @test2_minimal(float %A, float %B) {
35; CHECK-LABEL: @test2_minimal(
36; CHECK-NEXT:    [[TMP1:%.*]] = fsub reassoc nsz float [[A:%.*]], [[B:%.*]]
37; CHECK-NEXT:    ret float [[TMP1]]
38;
39  %W = fadd reassoc nsz float %B, 5.000000e+00
40  %X = fadd reassoc nsz float %A, -7.000000e+00
41  %Y = fsub reassoc nsz float %X, %W
42  %Z = fadd reassoc nsz float %Y, 1.200000e+01
43  ret float %Z
44}
45
46; Verify the fold is not done with only 'reassoc' ('nsz' is required).
47define float @test2_reassoc(float %A, float %B) {
48; CHECK-LABEL: @test2_reassoc(
49; CHECK-NEXT:    [[W:%.*]] = fadd reassoc float [[B:%.*]], 5.000000e+00
50; CHECK-NEXT:    [[X:%.*]] = fadd reassoc float [[A:%.*]], -7.000000e+00
51; CHECK-NEXT:    [[Y:%.*]] = fsub reassoc float [[X]], [[W]]
52; CHECK-NEXT:    [[Z:%.*]] = fadd reassoc float [[Y]], 1.200000e+01
53; CHECK-NEXT:    ret float [[Z]]
54;
55  %W = fadd reassoc float %B, 5.000000e+00
56  %X = fadd reassoc float %A, -7.000000e+00
57  %Y = fsub reassoc float %X, %W
58  %Z = fadd reassoc float %Y, 1.200000e+01
59  ret float %Z
60}
61
62define float @test3(float %A, float %B, float %C, float %D) {
63; CHECK-LABEL: @test3(
64; CHECK-NEXT:    [[M:%.*]] = fadd float [[A:%.*]], 1.200000e+01
65; CHECK-NEXT:    [[N:%.*]] = fadd float [[M]], [[B:%.*]]
66; CHECK-NEXT:    [[O:%.*]] = fadd float [[N]], [[C:%.*]]
67; CHECK-NEXT:    [[P:%.*]] = fsub float [[D:%.*]], [[O]]
68; CHECK-NEXT:    [[Q:%.*]] = fadd float [[P]], 1.200000e+01
69; CHECK-NEXT:    ret float [[Q]]
70;
71  %M = fadd float %A, 1.200000e+01
72  %N = fadd float %M, %B
73  %O = fadd float %N, %C
74  %P = fsub float %D, %O
75  %Q = fadd float %P, 1.200000e+01
76  ret float %Q
77}
78
79; With sub reassociation, constant folding can eliminate the two 12 constants.
80
81define float @test4(float %A, float %B, float %C, float %D) {
82; FIXME: InstCombine should be able to get us to the following:
83; %sum = fadd fast float %B, %A
84; %sum1 = fadd fast float %sum, %C
85; %Q = fsub fast float %D, %sum1
86; ret i32 %Q
87; CHECK-LABEL: @test4(
88; CHECK-NEXT:    [[B_NEG:%.*]] = fsub fast float -0.000000e+00, [[B:%.*]]
89; CHECK-NEXT:    [[O_NEG:%.*]] = fsub fast float [[B_NEG]], [[A:%.*]]
90; CHECK-NEXT:    [[P:%.*]] = fsub fast float [[O_NEG]], [[C:%.*]]
91; CHECK-NEXT:    [[Q:%.*]] = fadd fast float [[P]], [[D:%.*]]
92; CHECK-NEXT:    ret float [[Q]]
93;
94  %M = fadd fast float 1.200000e+01, %A
95  %N = fadd fast float %M, %B
96  %O = fadd fast float %N, %C
97  %P = fsub fast float %D, %O
98  %Q = fadd fast float 1.200000e+01, %P
99  ret float %Q
100}
101
102; Check again using minimal subset of FMF.
103
104define float @test4_reassoc(float %A, float %B, float %C, float %D) {
105; CHECK-LABEL: @test4_reassoc(
106; CHECK-NEXT:    [[M:%.*]] = fadd reassoc float [[A:%.*]], 1.200000e+01
107; CHECK-NEXT:    [[N:%.*]] = fadd reassoc float [[M]], [[B:%.*]]
108; CHECK-NEXT:    [[O:%.*]] = fadd reassoc float [[N]], [[C:%.*]]
109; CHECK-NEXT:    [[P:%.*]] = fsub reassoc float [[D:%.*]], [[O]]
110; CHECK-NEXT:    [[Q:%.*]] = fadd reassoc float [[P]], 1.200000e+01
111; CHECK-NEXT:    ret float [[Q]]
112;
113  %M = fadd reassoc float 1.200000e+01, %A
114  %N = fadd reassoc float %M, %B
115  %O = fadd reassoc float %N, %C
116  %P = fsub reassoc float %D, %O
117  %Q = fadd reassoc float 1.200000e+01, %P
118  ret float %Q
119}
120
121