1; RUN: llc < %s -mtriple=thumbv7-apple-darwin10 -relocation-model=pic -disable-fp-elim -mcpu=cortex-a8 | FileCheck %s
2
3; subs r4, #1
4; cmp r4, 0
5; bgt
6; cmp cannot be optimized away since it will clear the overflow bit.
7; gt / ge, lt, le conditions all depend on V bit.
8; rdar://9172742
9
10define i32 @t() nounwind {
11; CHECK: t:
12entry:
13  br label %bb2
14
15bb:                                               ; preds = %bb2
16  %0 = tail call i32 @rand() nounwind
17  %1 = icmp eq i32 %0, 50
18  br i1 %1, label %bb3, label %bb1
19
20bb1:                                              ; preds = %bb
21  %tmp = tail call i32 @puts() nounwind
22  %indvar.next = add i32 %indvar, 1
23  br label %bb2
24
25bb2:                                              ; preds = %bb1, %entry
26; CHECK: bb2
27; CHECK: subs [[REG:r[0-9]+]], #1
28; CHECK: cmp [[REG]], #0
29; CHECK: bgt
30  %indvar = phi i32 [ %indvar.next, %bb1 ], [ 0, %entry ]
31  %tries.0 = sub i32 2147483647, %indvar
32  %tmp1 = icmp sgt i32 %tries.0, 0
33  br i1 %tmp1, label %bb, label %bb3
34
35bb3:                                              ; preds = %bb2, %bb
36  ret i32 0
37}
38
39declare i32 @rand()
40
41declare i32 @puts() nounwind
42