1; RUN: opt -regions -analyze < %s | FileCheck %s
2
3; We should not crash if there are some bbs that are not reachable.
4define void @f() {
5entry:
6  br label %for.pre
7
8notintree:                                        ; No predecessors!
9  br label %ret
10
11for.pre:                                          ; preds = %entry
12  br label %for
13
14for:                                              ; preds = %for.inc, %for.pre
15  %indvar = phi i64 [ 0, %for.pre ], [ %indvar.next, %for.inc ]
16  %exitcond = icmp ne i64 %indvar, 200
17  br i1 %exitcond, label %for.inc, label %ret
18
19for.inc:                                          ; preds = %for
20  %indvar.next = add i64 %indvar, 1
21  br label %for
22
23ret:                                              ; preds = %for, %notintree
24  ret void
25}
26
27; CHECK: [0] entry => <Function Return>
28; CHECK:   [1] for => ret
29
30