; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; RUN: opt -passes=memcpyopt -S %s -verify-memoryssa | FileCheck %s %T = type { i8, i32 } ; A global constant of %T @C = external constant %T ; Ensure load-store forwarding of an aggregate is interpreted as ; a memmove when the source and dest may alias define void @test_memmove(ptr align 8 %a, ptr align 16 %b) { ; CHECK-LABEL: @test_memmove( ; CHECK-NEXT: call void @llvm.memmove.p0.p0.i64(ptr align 16 [[B:%.*]], ptr align 8 [[A:%.*]], i64 8, i1 false) ; CHECK-NEXT: ret void ; %val = load %T, ptr %a, align 8 store %T %val, ptr %b, align 16 ret void } ; Ensure load-store forwarding of an aggregate is interpreted as ; a memcpy when the source and dest do not alias define void @test_memcpy(ptr noalias align 8 %a, ptr noalias align 16 %b) { ; CHECK-LABEL: @test_memcpy( ; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr align 16 [[B:%.*]], ptr align 8 [[A:%.*]], i64 8, i1 false) ; CHECK-NEXT: ret void ; %val = load %T, ptr %a, align 8 store %T %val, ptr %b, align 16 ret void } define void @test_memcpy_constant(ptr %d) { ; CHECK-LABEL: @test_memcpy_constant( ; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr align 16 [[D:%.*]], ptr align 8 @C, i64 8, i1 false) ; CHECK-NEXT: ret void ; %val = load %T, ptr @C, align 8 store %T %val, ptr %d, align 16 ret void } ; memcpy(%d, %a) should not be generated since store2 may-aliases load %a. define void @f(ptr %a, ptr %b, ptr %c, ptr %d) { ; CHECK-LABEL: @f( ; CHECK-NEXT: [[VAL:%.*]] = load [[T:%.*]], ptr [[A:%.*]], align 4, !alias.scope !0 ; CHECK-NEXT: store [[T]] { i8 23, i32 23 }, ptr [[B:%.*]], align 4, !alias.scope !3 ; CHECK-NEXT: store [[T]] { i8 44, i32 44 }, ptr [[C:%.*]], align 4, !alias.scope !6, !noalias !3 ; CHECK-NEXT: store [[T]] [[VAL]], ptr [[D:%.*]], align 4, !alias.scope !9, !noalias !12 ; CHECK-NEXT: ret void ; %val = load %T, ptr %a, !alias.scope !{!10} ; store1 may-aliases the load store %T { i8 23, i32 23 }, ptr %b, !alias.scope !{!11} ; store2 may-aliases the load and store3 store %T { i8 44, i32 44 }, ptr %c, !alias.scope !{!12}, !noalias !{!11} ; store3 store %T %val, ptr %d, !alias.scope !{!13}, !noalias !{!10, !11} ret void } !0 = !{!0} !1 = !{!1} !2 = !{!2} !3 = !{!3} !10 = !{ !10, !0 } !11 = !{ !11, !1 } !12 = !{ !12, !2 } !13 = !{ !13, !3 }