| ; RUN: llc < %s -mtriple=arm-eabi -mattr=+v4t -O0 | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK_O0 |
| ; RUN: llc < %s -mtriple=arm-eabi -mattr=+v4t -O1 | FileCheck %s -check-prefix=CHECK -check-prefix=CHECK_O1 |
| |
| ; In /O0, the addition must not be eliminated. This happens when the load |
| ; and store are folded by the DAGCombiner. In /O1 and above, the optimization |
| ; must be executed. |
| |
| ; CHECK-LABEL: {{^}}main |
| ; CHECK: mov [[TMP:r[0-9]+]], #0 |
| ; CHECK-NEXT: str [[TMP]], [sp, #4] |
| ; CHECK_O0: str [[TMP]], [sp] |
| ; CHECK_O0: ldr [[TMP:r[0-9]+]], [sp] |
| ; CHECK_O0-NEXT: add [[TMP]], [[TMP]], #2 |
| ; CHECK_O1-NOT: ldr [[TMP:r[0-9]+]], [sp] |
| ; CHECK_O1-NOT: add [[TMP]], [[TMP]], #2 |
| |
| define i32 @main() { |
| bb: |
| %tmp = alloca i32, align 4 |
| %tmp1 = alloca i32, align 4 |
| store i32 0, i32* %tmp, align 4 |
| store i32 0, i32* %tmp1, align 4 |
| %tmp2 = load i32, i32* %tmp1, align 4 |
| %tmp3 = add nsw i32 %tmp2, 2 |
| store i32 %tmp3, i32* %tmp1, align 4 |
| %tmp4 = load i32, i32* %tmp1, align 4 |
| %tmp5 = icmp eq i32 %tmp4, 2 |
| br i1 %tmp5, label %bb6, label %bb7 |
| |
| bb6: ; preds = %bb |
| store i32 0, i32* %tmp, align 4 |
| br label %bb8 |
| |
| bb7: ; preds = %bb |
| store i32 5, i32* %tmp, align 4 |
| br label %bb8 |
| |
| bb8: ; preds = %bb7, %bb6 |
| %tmp9 = load i32, i32* %tmp, align 4 |
| ret i32 %tmp9 |
| } |
