; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; Test to make sure llvm.invariant.start calls are not treated as clobbers. ; RUN: opt < %s -passes=dse -S | FileCheck %s declare ptr @llvm.invariant.start.p0(i64, ptr nocapture) nounwind readonly ; We could remove either store here. The first store is dead in the ; conventional sense, because there is a later killing store. The second store ; is undefined behavior by the semantics of invariant.start, and as such ; unreachable. define void @test(ptr %p) { ; CHECK-LABEL: @test( ; CHECK-NEXT: store i8 3, ptr [[P:%.*]], align 4 ; CHECK-NEXT: ret void ; store i8 1, ptr %p, align 4 %i = call ptr @llvm.invariant.start.p0(i64 1, ptr %p) store i8 3, ptr %p, align 4 ret void } ; FIXME: We should be able to remove the first store to p, even though p and q ; may alias. define void @test2(ptr %p, ptr %q) { ; CHECK-LABEL: @test2( ; CHECK-NEXT: store i8 1, ptr [[P:%.*]], align 4 ; CHECK-NEXT: store i8 2, ptr [[Q:%.*]], align 4 ; CHECK-NEXT: [[I:%.*]] = call ptr @llvm.invariant.start.p0(i64 1, ptr [[Q]]) ; CHECK-NEXT: store i8 3, ptr [[P]], align 4 ; CHECK-NEXT: ret void ; store i8 1, ptr %p, align 4 store i8 2, ptr %q, align 4 %i = call ptr @llvm.invariant.start.p0(i64 1, ptr %q) store i8 3, ptr %p, align 4 ret void }