1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt -passes=memcpyopt -S %s -verify-memoryssa | FileCheck %s
6 ; A global constant of %T
7 @C = external constant %T
9 ; Ensure load-store forwarding of an aggregate is interpreted as
10 ; a memmove when the source and dest may alias
11 define void @test_memmove(ptr align 8 %a, ptr align 16 %b) {
12 ; CHECK-LABEL: @test_memmove(
13 ; CHECK-NEXT: call void @llvm.memmove.p0.p0.i64(ptr align 16 [[B:%.*]], ptr align 8 [[A:%.*]], i64 8, i1 false)
14 ; CHECK-NEXT: ret void
16 %val = load %T, ptr %a, align 8
17 store %T %val, ptr %b, align 16
21 ; Ensure load-store forwarding of an aggregate is interpreted as
22 ; a memcpy when the source and dest do not alias
23 define void @test_memcpy(ptr noalias align 8 %a, ptr noalias align 16 %b) {
24 ; CHECK-LABEL: @test_memcpy(
25 ; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr align 16 [[B:%.*]], ptr align 8 [[A:%.*]], i64 8, i1 false)
26 ; CHECK-NEXT: ret void
28 %val = load %T, ptr %a, align 8
29 store %T %val, ptr %b, align 16
33 define void @test_memcpy_constant(ptr %d) {
34 ; CHECK-LABEL: @test_memcpy_constant(
35 ; CHECK-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr align 16 [[D:%.*]], ptr align 8 @C, i64 8, i1 false)
36 ; CHECK-NEXT: ret void
38 %val = load %T, ptr @C, align 8
39 store %T %val, ptr %d, align 16
43 ; memcpy(%d, %a) should not be generated since store2 may-aliases load %a.
44 define void @f(ptr %a, ptr %b, ptr %c, ptr %d) {
46 ; CHECK-NEXT: [[VAL:%.*]] = load [[T:%.*]], ptr [[A:%.*]], align 4, !alias.scope !0
47 ; CHECK-NEXT: store [[T]] { i8 23, i32 23 }, ptr [[B:%.*]], align 4, !alias.scope !3
48 ; CHECK-NEXT: store [[T]] { i8 44, i32 44 }, ptr [[C:%.*]], align 4, !alias.scope !6, !noalias !3
49 ; CHECK-NEXT: store [[T]] [[VAL]], ptr [[D:%.*]], align 4, !alias.scope !9, !noalias !12
50 ; CHECK-NEXT: ret void
52 %val = load %T, ptr %a, !alias.scope !{!10}
54 ; store1 may-aliases the load
55 store %T { i8 23, i32 23 }, ptr %b, !alias.scope !{!11}
57 ; store2 may-aliases the load and store3
58 store %T { i8 44, i32 44 }, ptr %c, !alias.scope !{!12}, !noalias !{!11}
61 store %T %val, ptr %d, !alias.scope !{!13}, !noalias !{!10, !11}