| Evan Cheng | 2c33915 | 2011-03-23 22:52:04 +0000 | [diff] [blame] | 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 | |
| 10 | define i32 @t() nounwind { |
| 11 | ; CHECK: t: |
| 12 | entry: |
| 13 | br label %bb2 |
| 14 | |
| 15 | bb: ; 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 | |
| 20 | bb1: ; preds = %bb |
| 21 | %tmp = tail call i32 @puts() nounwind |
| 22 | %indvar.next = add i32 %indvar, 1 |
| 23 | br label %bb2 |
| 24 | |
| 25 | bb2: ; 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 | |
| 35 | bb3: ; preds = %bb2, %bb |
| 36 | ret i32 0 |
| 37 | } |
| 38 | |
| 39 | declare i32 @rand() |
| 40 | |
| 41 | declare i32 @puts() nounwind |