| ; RUN: opt < %s -S -memcpyopt | FileCheck --match-full-lines %s |
| |
| ; Make sure callslot optimization merges alias.scope metadata correctly when it merges instructions. |
| ; Merging here naively generates: |
| ; call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %dst, i8* align 8 %src, i64 1, i1 false), !alias.scope !3 |
| ; call void @llvm.lifetime.end.p0i8(i64 8, i8* nonnull %src), !noalias !0 |
| ; ... |
| ; !0 = !{!1} |
| ; !1 = distinct !{!1, !2, !"callee1: %a"} |
| ; !2 = distinct !{!2, !"callee1"} |
| ; !3 = !{!1, !4} |
| ; !4 = distinct !{!4, !5, !"callee0: %a"} |
| ; !5 = distinct !{!5, !"callee0"} |
| ; Which is incorrect because the lifetime.end of %src will now "noalias" the above memcpy. |
| define i8 @test(i8 %input) { |
| %tmp = alloca i8 |
| %dst = alloca i8 |
| %src = alloca i8 |
| ; NOTE: we're matching the full line and looking for the lack of !alias.scope here |
| ; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %dst, i8* align 8 %src, i64 1, i1 false) |
| call void @llvm.lifetime.start.p0i8(i64 8, i8* nonnull %src), !noalias !3 |
| store i8 %input, i8* %src |
| call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %tmp, i8* align 8 %src, i64 1, i1 false), !alias.scope !0 |
| call void @llvm.lifetime.end.p0i8(i64 8, i8* nonnull %src), !noalias !3 |
| call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 8 %dst, i8* align 8 %tmp, i64 1, i1 false), !alias.scope !3 |
| %ret_value = load i8, i8* %dst |
| ret i8 %ret_value |
| } |
| |
| declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) |
| declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) |
| declare void @llvm.memcpy.p0i8.p0i8.i64(i8*, i8*, i64, i1) |
| |
| !0 = !{!1} |
| !1 = distinct !{!1, !2, !"callee0: %a"} |
| !2 = distinct !{!2, !"callee0"} |
| !3 = !{!4} |
| !4 = distinct !{!4, !5, !"callee1: %a"} |
| !5 = distinct !{!5, !"callee1"} |