1; RUN: opt -indvars -S < %s | FileCheck %s
2
3@b = common global i32 0, align 4
4@c = common global i32 0, align 4
5@a = common global i32 0, align 4
6
7declare void @abort() #1
8
9; Function Attrs: nounwind ssp uwtable
10define i32 @main() {
11entry:
12  %a.promoted13 = load i32, i32* @a, align 4
13  br label %for.cond1.preheader
14
15for.cond1.preheader:                              ; preds = %entry, %for.end
16  %or.lcssa14 = phi i32 [ %a.promoted13, %entry ], [ %or.lcssa, %for.end ]
17  %d.010 = phi i32 [ 1, %entry ], [ 0, %for.end ]
18  br label %for.body3
19
20for.body3:                                        ; preds = %for.cond1.preheader, %for.body3
21  %inc12 = phi i32 [ 0, %for.cond1.preheader ], [ %inc, %for.body3 ]
22  %or11 = phi i32 [ %or.lcssa14, %for.cond1.preheader ], [ %or, %for.body3 ]
23; CHECK-NOT: sub nuw i32 %inc12, %d.010
24; CHECK: sub i32 %inc12, %d.010
25  %add = sub i32 %inc12, %d.010
26  %or = or i32 %or11, %add
27  %inc = add i32 %inc12, 1
28  br i1 false, label %for.body3, label %for.end
29
30for.end:                                          ; preds = %for.body3
31  %or.lcssa = phi i32 [ %or, %for.body3 ]
32  br i1 false, label %for.cond1.preheader, label %for.end6
33
34for.end6:                                         ; preds = %for.end
35  %or.lcssa.lcssa = phi i32 [ %or.lcssa, %for.end ]
36  store i32 %or.lcssa.lcssa, i32* @a, align 4
37  %cmp7 = icmp eq i32 %or.lcssa.lcssa, -1
38  br i1 %cmp7, label %if.end, label %if.then
39
40if.then:                                          ; preds = %for.end6
41  tail call void @abort() #2
42  unreachable
43
44if.end:                                           ; preds = %for.end6
45  ret i32 0
46}
47