1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
; RUN: opt < %s -instcombine -S | FileCheck %s
; Test an already canonical branch to make sure we don't flip those.
define i32 @test0(i32 %X, i32 %Y) {
%C = icmp eq i32 %X, %Y
br i1 %C, label %T, label %F, !prof !0
; CHECK-LABEL: @test0(
; CHECK: %C = icmp eq i32 %X, %Y
; CHECK: br i1 %C, label %T, label %F
T:
ret i32 12
F:
ret i32 123
}
define i32 @test1(i32 %X, i32 %Y) {
%C = icmp ne i32 %X, %Y
br i1 %C, label %T, label %F, !prof !1
; CHECK-LABEL: @test1(
; CHECK: %C = icmp eq i32 %X, %Y
; CHECK: br i1 %C, label %F, label %T
T:
ret i32 12
F:
ret i32 123
}
define i32 @test2(i32 %X, i32 %Y) {
%C = icmp ule i32 %X, %Y
br i1 %C, label %T, label %F, !prof !2
; CHECK-LABEL: @test2(
; CHECK: %C = icmp ugt i32 %X, %Y
; CHECK: br i1 %C, label %F, label %T
T:
ret i32 12
F:
ret i32 123
}
define i32 @test3(i32 %X, i32 %Y) {
%C = icmp uge i32 %X, %Y
br i1 %C, label %T, label %F, !prof !3
; CHECK-LABEL: @test3(
; CHECK: %C = icmp ult i32 %X, %Y
; CHECK: br i1 %C, label %F, label %T
T:
ret i32 12
F:
ret i32 123
}
!0 = metadata !{metadata !"branch_weights", i32 1, i32 2}
!1 = metadata !{metadata !"branch_weights", i32 3, i32 4}
!2 = metadata !{metadata !"branch_weights", i32 5, i32 6}
!3 = metadata !{metadata !"branch_weights", i32 7, i32 8}
; Base case shouldn't change.
; CHECK: !0 = {{.*}} i32 1, i32 2}
; Ensure that the branch metadata is reversed to match the reversals above.
; CHECK: !1 = {{.*}} i32 4, i32 3}
; CHECK: !2 = {{.*}} i32 6, i32 5}
; CHECK: !3 = {{.*}} i32 8, i32 7}
|
