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
70
71
72
73
74
75
76
77
78
79
80
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
; RUN: opt < %s -S -passes='simplifycfg<speculate-blocks>' | FileCheck %s --check-prefix=YES
; RUN: opt < %s -S -passes='simplifycfg<no-speculate-blocks>' | FileCheck %s --check-prefix=NO
define i32 @f(i1 %a) {
; YES-LABEL: define i32 @f
; YES-SAME: (i1 [[A:%.*]]) {
; YES-NEXT: entry:
; YES-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[A]], i32 5, i32 2
; YES-NEXT: ret i32 [[SPEC_SELECT]]
;
; NO-LABEL: define i32 @f
; NO-SAME: (i1 [[A:%.*]]) {
; NO-NEXT: entry:
; NO-NEXT: br i1 [[A]], label [[BB:%.*]], label [[BB2:%.*]]
; NO: bb:
; NO-NEXT: br label [[BB2]]
; NO: bb2:
; NO-NEXT: [[R:%.*]] = phi i32 [ 2, [[ENTRY:%.*]] ], [ 5, [[BB]] ]
; NO-NEXT: ret i32 [[R]]
;
entry:
br i1 %a, label %bb, label %bb2
bb:
br label %bb2
bb2:
%r = phi i32 [ 2, %entry ], [ 5, %bb ]
ret i32 %r
}
define void @fold_branch_to_common_dest(i8 %v0, i8 %v1) {
; YES-LABEL: define void @fold_branch_to_common_dest
; YES-SAME: (i8 [[V0:%.*]], i8 [[V1:%.*]]) {
; YES-NEXT: pred:
; YES-NEXT: [[C0:%.*]] = icmp eq i8 [[V0]], 0
; YES-NEXT: [[C1:%.*]] = icmp eq i8 [[V1]], 0
; YES-NEXT: [[OR_COND:%.*]] = select i1 [[C0]], i1 [[C1]], i1 false
; YES-NEXT: br i1 [[OR_COND]], label [[FINAL_LEFT:%.*]], label [[FINAL_RIGHT:%.*]]
; YES: common.ret:
; YES-NEXT: ret void
; YES: final_left:
; YES-NEXT: call void @sideeffect0()
; YES-NEXT: br label [[COMMON_RET:%.*]]
; YES: final_right:
; YES-NEXT: call void @sideeffect1()
; YES-NEXT: br label [[COMMON_RET]]
;
; NO-LABEL: define void @fold_branch_to_common_dest
; NO-SAME: (i8 [[V0:%.*]], i8 [[V1:%.*]]) {
; NO-NEXT: pred:
; NO-NEXT: [[C0:%.*]] = icmp eq i8 [[V0]], 0
; NO-NEXT: br i1 [[C0]], label [[DISPATCH:%.*]], label [[FINAL_RIGHT:%.*]]
; NO: dispatch:
; NO-NEXT: [[C1:%.*]] = icmp eq i8 [[V1]], 0
; NO-NEXT: br i1 [[C1]], label [[FINAL_LEFT:%.*]], label [[FINAL_RIGHT]]
; NO: common.ret:
; NO-NEXT: ret void
; NO: final_left:
; NO-NEXT: call void @sideeffect0()
; NO-NEXT: br label [[COMMON_RET:%.*]]
; NO: final_right:
; NO-NEXT: call void @sideeffect1()
; NO-NEXT: br label [[COMMON_RET]]
;
pred:
%c0 = icmp eq i8 %v0, 0
br i1 %c0, label %dispatch, label %final_right
dispatch:
%c1 = icmp eq i8 %v1, 0
br i1 %c1, label %final_left, label %final_right
final_left:
call void @sideeffect0()
ret void
final_right:
call void @sideeffect1()
ret void
}
declare void @sideeffect0()
declare void @sideeffect1()
|
