indirectbr.ll
4.14 KB
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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -ipsccp < %s | FileCheck %s
declare void @BB0_f()
declare void @BB1_f()
; Make sure we can eliminate what is in BB0 as we know that the indirectbr is going to BB1.
;
define void @indbrtest1() {
; CHECK-LABEL: @indbrtest1(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: BB1:
; CHECK-NEXT: call void @BB1_f()
; CHECK-NEXT: ret void
;
entry:
indirectbr i8* blockaddress(@indbrtest1, %BB1), [label %BB0, label %BB1]
BB0:
call void @BB0_f()
br label %BB1
BB1:
call void @BB1_f()
ret void
}
; Make sure we can eliminate what is in BB0 as we know that the indirectbr is going to BB1
; by looking through the casts. The casts should be folded away when they are visited
; before the indirectbr instruction.
;
define void @indbrtest2() {
; CHECK-LABEL: @indbrtest2(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: BB1:
; CHECK-NEXT: call void @BB1_f()
; CHECK-NEXT: ret void
;
entry:
%a = ptrtoint i8* blockaddress(@indbrtest2, %BB1) to i64
%b = inttoptr i64 %a to i8*
%c = bitcast i8* %b to i8*
indirectbr i8* %b, [label %BB0, label %BB1]
BB0:
call void @BB0_f()
br label %BB1
BB1:
call void @BB1_f()
ret void
}
; Make sure we can not eliminate BB0 as we do not know the target of the indirectbr.
define void @indbrtest3(i8** %Q) {
; CHECK-LABEL: @indbrtest3(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[T:%.*]] = load i8*, i8** [[Q:%.*]], align 8
; CHECK-NEXT: indirectbr i8* [[T]], [label [[BB0:%.*]], label %BB1]
; CHECK: BB0:
; CHECK-NEXT: call void @BB0_f()
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: BB1:
; CHECK-NEXT: call void @BB1_f()
; CHECK-NEXT: ret void
;
entry:
%t = load i8*, i8** %Q
indirectbr i8* %t, [label %BB0, label %BB1]
BB0:
call void @BB0_f()
br label %BB1
BB1:
call void @BB1_f()
ret void
}
; Make sure we eliminate BB1 as we pick the first successor on undef.
define void @indbrtest4(i8** %Q) {
; CHECK-LABEL: @indbrtest4(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[BB0:%.*]]
; CHECK: BB0:
; CHECK-NEXT: call void @BB0_f()
; CHECK-NEXT: ret void
;
entry:
indirectbr i8* undef, [label %BB0, label %BB1]
BB0:
call void @BB0_f()
ret void
BB1:
call void @BB1_f()
ret void
}
define internal i32 @indbrtest5(i1 %c) {
; CHECK-LABEL: @indbrtest5(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[C:%.*]], label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: br label [[BRANCH_BLOCK:%.*]]
; CHECK: bb2:
; CHECK-NEXT: br label [[BRANCH_BLOCK]]
; CHECK: branch.block:
; CHECK-NEXT: [[ADDR:%.*]] = phi i8* [ blockaddress(@indbrtest5, [[TARGET1:%.*]]), [[BB1]] ], [ blockaddress(@indbrtest5, [[TARGET2:%.*]]), [[BB2]] ]
; CHECK-NEXT: indirectbr i8* [[ADDR]], [label [[TARGET1]], label %target2]
; CHECK: target1:
; CHECK-NEXT: br label [[TARGET2]]
; CHECK: target2:
; CHECK-NEXT: ret i32 undef
;
entry:
br i1 %c, label %bb1, label %bb2
bb1:
br label %branch.block
bb2:
br label %branch.block
branch.block:
%addr = phi i8* [blockaddress(@indbrtest5, %target1), %bb1], [blockaddress(@indbrtest5, %target2), %bb2]
indirectbr i8* %addr, [label %target1, label %target2]
target1:
br label %target2
target2:
ret i32 10
}
define i32 @indbrtest5_callee(i1 %c) {
; CHECK-LABEL: @indbrtest5_callee(
; CHECK-NEXT: [[R:%.*]] = call i32 @indbrtest5(i1 [[C:%.*]])
; CHECK-NEXT: ret i32 10
;
%r = call i32 @indbrtest5(i1 %c)
ret i32 %r
}
define i32 @indbr_duplicate_successors_phi(i1 %c, i32 %x) {
; CHECK-LABEL: @indbr_duplicate_successors_phi(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[C:%.*]], label [[INDBR:%.*]], label [[BB0:%.*]]
; CHECK: indbr:
; CHECK-NEXT: br label [[BB0]]
; CHECK: BB0:
; CHECK-NEXT: [[PHI:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ 0, [[INDBR]] ]
; CHECK-NEXT: ret i32 [[PHI]]
;
entry:
br i1 %c, label %indbr, label %BB0
indbr:
indirectbr i8* blockaddress(@indbr_duplicate_successors_phi, %BB0), [label %BB0, label %BB0, label %BB1]
BB0:
%phi = phi i32 [ %x, %entry ], [ 0, %indbr ], [ 0, %indbr ]
ret i32 %phi
BB1:
ret i32 0
}