| Konstantin Zhuravlyov | 081385a | 2016-10-12 13:44:24 +0000 | [diff] [blame] | 1 | ; RUN: llc < %s -mtriple=arm-eabi -mattr=+v4t -O0 | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK_O0 |
| 2 | ; RUN: llc < %s -mtriple=arm-eabi -mattr=+v4t -O1 | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK_O1 |
| 3 | |
| 4 | ; In /O0, the addition must not be eliminated. This happens when the load |
| 5 | ; and store are folded by the DAGCombiner. In /O1 and above, the optimization |
| 6 | ; must be executed. |
| 7 | |
| 8 | ; CHECK-LABEL: {{^}}main |
| 9 | ; CHECK: mov [[TMP:r[0-9]+]], #0 |
| 10 | ; CHECK-NEXT: str [[TMP]], [sp, #4] |
| Nirav Dave | da8f221 | 2017-05-16 19:43:56 +0000 | [diff] [blame] | 11 | ; CHECK_O0: str [[TMP]], [sp] |
| Konstantin Zhuravlyov | 081385a | 2016-10-12 13:44:24 +0000 | [diff] [blame] | 12 | ; CHECK_O0: ldr [[TMP:r[0-9]+]], [sp] |
| 13 | ; CHECK_O0-NEXT: add [[TMP]], [[TMP]], #2 |
| 14 | ; CHECK_O1-NOT: ldr [[TMP:r[0-9]+]], [sp] |
| 15 | ; CHECK_O1-NOT: add [[TMP]], [[TMP]], #2 |
| 16 | |
| 17 | define i32 @main() { |
| 18 | bb: |
| 19 | %tmp = alloca i32, align 4 |
| 20 | %tmp1 = alloca i32, align 4 |
| 21 | store i32 0, i32* %tmp, align 4 |
| 22 | store i32 0, i32* %tmp1, align 4 |
| 23 | %tmp2 = load i32, i32* %tmp1, align 4 |
| 24 | %tmp3 = add nsw i32 %tmp2, 2 |
| 25 | store i32 %tmp3, i32* %tmp1, align 4 |
| 26 | %tmp4 = load i32, i32* %tmp1, align 4 |
| 27 | %tmp5 = icmp eq i32 %tmp4, 2 |
| 28 | br i1 %tmp5, label %bb6, label %bb7 |
| 29 | |
| 30 | bb6: ; preds = %bb |
| 31 | store i32 0, i32* %tmp, align 4 |
| 32 | br label %bb8 |
| 33 | |
| 34 | bb7: ; preds = %bb |
| 35 | store i32 5, i32* %tmp, align 4 |
| 36 | br label %bb8 |
| 37 | |
| 38 | bb8: ; preds = %bb7, %bb6 |
| 39 | %tmp9 = load i32, i32* %tmp, align 4 |
| 40 | ret i32 %tmp9 |
| 41 | } |