blob: 03d12e3e4c9724de9b45be670e71bf640c15f125 (
plain)
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
|
; RUN: llvm-as < %s | opt -condprop | llvm-dis | not grep phi
declare i1 @foo()
define i32 @test(i32 %C) {
%Val = call i1 @foo( ) ; <i1> [#uses=2]
switch i32 %C, label %T1 [
i32 4, label %T2
i32 17, label %T3
]
T1: ; preds = %0
call void @a( )
br label %Cont
T2: ; preds = %0
call void @b( )
br label %Cont
T3: ; preds = %0
call void @c( )
br label %Cont
Cont: ; preds = %T3, %T2, %T1
;; PHI becomes dead after threading T2
%C2 = phi i1 [ %Val, %T1 ], [ true, %T2 ], [ %Val, %T3 ] ; <i1> [#uses=1]
br i1 %C2, label %L2, label %F2
L2: ; preds = %Cont
call void @d( )
ret i32 17
F2: ; preds = %Cont
call void @e( )
ret i32 1
}
declare void @a()
declare void @b()
declare void @c()
declare void @d()
declare void @e()
|
