1; RUN: opt -indvars -S < %s | FileCheck %s
2
3define i32 @fn() {
4entry:
5  ret i32 10
6}
7
8define i32 @test_nested2(i32 %tnr) {
9; CHECK-LABEL: test_nested2
10; CHECK-NOT: %indvars.iv
11; CHECK: %i.0
12
13; indvars should not replace the i.0 variable with a new one; SCEVExpander
14; should determine that the old one is good to reuse.
15
16entry:
17  %res = alloca i32, align 4
18  store volatile i32 0, i32* %res, align 4
19  %call = call i32 @fn()
20  br label %for.cond
21
22for.cond:                                         ; preds = %for.inc6, %entry
23  %i.0 = phi i32 [ 0, %entry ], [ %inc7, %for.inc6 ]
24  %cmp = icmp slt i32 %i.0, %call
25  br i1 %cmp, label %for.body, label %for.cond.cleanup
26
27for.cond.cleanup:                                 ; preds = %for.cond
28  br label %for.end8
29
30for.body:                                         ; preds = %for.cond
31  br label %for.cond1
32
33for.cond1:                                        ; preds = %for.inc, %for.body
34  %j.0 = phi i32 [ 0, %for.body ], [ %inc5, %for.inc ]
35  %cmp2 = icmp slt i32 %j.0, %i.0
36  br i1 %cmp2, label %for.body4, label %for.cond.cleanup3
37
38for.cond.cleanup3:                                ; preds = %for.cond1
39  br label %for.end
40
41for.body4:                                        ; preds = %for.cond1
42  %0 = load volatile i32, i32* %res, align 4
43  %inc = add nsw i32 %0, 1
44  store volatile i32 %inc, i32* %res, align 4
45  br label %for.inc
46
47for.inc:                                          ; preds = %for.body4
48  %inc5 = add nsw i32 %j.0, 1
49  br label %for.cond1
50
51for.end:                                          ; preds = %for.cond.cleanup3
52  br label %for.inc6
53
54for.inc6:                                         ; preds = %for.end
55  %inc7 = add nsw i32 %i.0, 1
56  br label %for.cond
57
58for.end8:                                         ; preds = %for.cond.cleanup
59  %1 = load volatile i32, i32* %res, align 4
60  %cmp9 = icmp eq i32 %1, 45
61  %conv = zext i1 %cmp9 to i32
62  ret i32 %conv
63}
64