| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py |
| ; RUN: opt -S -passes=dse < %s | FileCheck %s |
| |
| ; Assume that %p1 != %p2 if and only if %c is true. In that case the noalias |
| ; metadata is correct, but the first store cannot be eliminated, as it may be |
| ; read-clobbered by the load. |
| define void @test(i1 %c, ptr %p1, ptr %p2) { |
| ; CHECK-LABEL: @test( |
| ; CHECK-NEXT: store i8 0, ptr [[P1:%.*]], align 1 |
| ; CHECK-NEXT: [[TMP1:%.*]] = load i8, ptr [[P2:%.*]], align 1, !alias.scope !0 |
| ; CHECK-NEXT: br i1 [[C:%.*]], label [[IF:%.*]], label [[ELSE:%.*]] |
| ; CHECK: if: |
| ; CHECK-NEXT: store i8 1, ptr [[P1]], align 1, !noalias !0 |
| ; CHECK-NEXT: ret void |
| ; CHECK: else: |
| ; CHECK-NEXT: store i8 2, ptr [[P1]], align 1 |
| ; CHECK-NEXT: ret void |
| ; |
| store i8 0, ptr %p1 |
| load i8, ptr %p2, !alias.scope !2 |
| br i1 %c, label %if, label %else |
| |
| if: |
| store i8 1, ptr %p1, !noalias !2 |
| ret void |
| |
| else: |
| store i8 2, ptr %p1 |
| ret void |
| } |
| |
| !0 = !{!0} |
| !1 = !{!1, !0} |
| !2 = !{!1} |
