1; RUN: opt < %s -gvn -simplifycfg -adce | llvm-dis
2; RUN: opt < %s -gvn -simplifycfg -adce -verify-dom-info | llvm-dis
3
4; This test makes sure that the DominatorTree properly handles
5; deletion of edges that go to forward-unreachable regions.
6; In this case, %land.end is already forward unreachable when
7; the DT gets informed about the deletion of %entry -> %land.end.
8
9@a = common global i32 0, align 4
10
11define i32 @main() {
12entry:
13  %retval = alloca i32, align 4
14  store i32 0, i32* %retval, align 4
15  %0 = load i32, i32* @a, align 4
16  %cmp = icmp ne i32 %0, 1
17  br i1 %cmp, label %land.rhs, label %land.end4
18
19land.rhs:                                         ; preds = %entry
20  %1 = load i32, i32* @a, align 4
21  %tobool = icmp ne i32 %1, 0
22  br i1 %tobool, label %land.rhs1, label %land.end
23
24land.rhs1:                                        ; preds = %land.rhs
25  br label %land.end
26
27land.end:                                         ; preds = %land.rhs1, %land.rhs
28  %2 = phi i1 [ false, %land.rhs ], [ true, %land.rhs1 ]
29  %land.ext = zext i1 %2 to i32
30  %conv = trunc i32 %land.ext to i16
31  %conv2 = sext i16 %conv to i32
32  %tobool3 = icmp ne i32 %conv2, 0
33  br label %land.end4
34
35land.end4:                                        ; preds = %land.end, %entry
36  %3 = phi i1 [ false, %entry ], [ %tobool3, %land.end ]
37  %land.ext5 = zext i1 %3 to i32
38  ret i32 0
39}
40