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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -simplifycfg < %s | FileCheck %s
; This used to infinitely thread between loop and loop.latch without reaching a
; fixed point.
declare void @dummy()
define i32 @main(i1 %c1, i1 %c2, i32 %y) {
; CHECK-LABEL: @main(
; CHECK-NEXT: br i1 [[C1:%.*]], label [[EXIT:%.*]], label [[LOOP_PRE_PREHEADER:%.*]]
; CHECK: loop.pre.preheader:
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i32 [[Y:%.*]], -1
; CHECK-NEXT: br i1 [[CMP]], label [[LOOP_PREHEADER:%.*]], label [[EXIT]]
; CHECK: loop.preheader:
; CHECK-NEXT: [[CMP2:%.*]] = icmp eq i32 [[Y]], 0
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: br i1 [[C1]], label [[LOOP2:%.*]], label [[LOOP_LATCH:%.*]]
; CHECK: loop.latch:
; CHECK-NEXT: br i1 [[CMP]], label [[LOOP]], label [[EXIT]]
; CHECK: loop2:
; CHECK-NEXT: br i1 [[CMP2]], label [[JOIN:%.*]], label [[IF:%.*]]
; CHECK: if:
; CHECK-NEXT: call void @dummy()
; CHECK-NEXT: br label [[JOIN]]
; CHECK: join:
; CHECK-NEXT: br i1 [[C2:%.*]], label [[LOOP2]], label [[LOOP_LATCH]]
; CHECK: exit:
; CHECK-NEXT: ret i32 0
;
br i1 %c1, label %exit, label %loop.pre.preheader
loop.pre.preheader:
%cmp = icmp sgt i32 %y, -1
br i1 %cmp, label %loop.preheader, label %exit
loop.preheader:
%cmp2 = icmp eq i32 %y, 0
br label %loop
loop:
br i1 %c1, label %loop2, label %loop.latch
loop.latch:
br i1 %cmp, label %loop, label %exit
loop2:
br i1 %cmp2, label %join, label %if
if:
call void @dummy()
br label %join
join:
br i1 %c2, label %loop2, label %loop.latch
exit:
ret i32 0
; uselistorder directives
uselistorder label %loop2, { 1, 0 }
}
|
