1; RUN: opt < %s  -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -dce
2
3; Check that we don't fall into an infinite loop.
4define void @test() nounwind {
5entry:
6 br label %for.body
7
8for.body:
9 %0 = phi i32 [ 1, %entry ], [ 0, %for.body ]
10 br label %for.body
11}
12
13
14
15define void @test2() nounwind {
16entry:
17 br label %for.body
18
19for.body:                                         ; preds = %for.body, %entry
20 %indvars.iv47 = phi i64 [ 0, %entry ], [ %indvars.iv.next48, %for.body ]
21 %0 = phi i32 [ 1, %entry ], [ 0, %for.body ]
22 %indvars.iv.next48 = add i64 %indvars.iv47, 1
23 br i1 undef, label %for.end, label %for.body
24
25for.end:                                          ; preds = %for.body
26 unreachable
27}
28
29;PR14701
30define void @start_model_rare() nounwind uwtable ssp {
31entry:
32  br i1 undef, label %return, label %if.end
33
34if.end:                                           ; preds = %entry
35  br i1 undef, label %cond.false, label %cond.true
36
37cond.true:                                        ; preds = %if.end
38  unreachable
39
40cond.false:                                       ; preds = %if.end
41  br i1 undef, label %cond.false28, label %cond.true20
42
43cond.true20:                                      ; preds = %cond.false
44  unreachable
45
46cond.false28:                                     ; preds = %cond.false
47  br label %for.body40
48
49for.body40:                                       ; preds = %for.inc50, %cond.false28
50  %indvars.iv123 = phi i64 [ 3, %cond.false28 ], [ %indvars.iv.next124, %for.inc50 ]
51  %step.0121 = phi i32 [ 1, %cond.false28 ], [ %step.1, %for.inc50 ]
52  br i1 undef, label %if.then46, label %for.inc50
53
54if.then46:                                        ; preds = %for.body40
55  %inc47 = add nsw i32 %step.0121, 1
56  br label %for.inc50
57
58for.inc50:                                        ; preds = %if.then46, %for.body40
59  %k.1 = phi i32 [ undef, %for.body40 ], [ %inc47, %if.then46 ]
60  %step.1 = phi i32 [ %step.0121, %for.body40 ], [ %inc47, %if.then46 ]
61  %indvars.iv.next124 = add i64 %indvars.iv123, 1
62  %lftr.wideiv = trunc i64 %indvars.iv.next124 to i32
63  %exitcond = icmp eq i32 %lftr.wideiv, 256
64  br i1 %exitcond, label %for.end52, label %for.body40
65
66for.end52:                                        ; preds = %for.inc50
67  unreachable
68
69return:                                           ; preds = %entry
70  ret void
71}
72