derek.holloway
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43 lines
1.7 KiB
LLVM
43 lines
1.7 KiB
LLVM
; RUN: opt < %s -S -passes=memcpyopt | FileCheck --match-full-lines %s
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declare void @use(ptr)
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; Make sure callslot optimization merges alias.scope metadata correctly when it merges instructions.
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; Merging here naively generates:
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; call void @llvm.memcpy.p0.p0.i64(ptr align 8 %dst, ptr align 8 %src, i64 1, i1 false), !alias.scope !3
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; call void @llvm.lifetime.end.p0(ptr nonnull %src), !noalias !0
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; ...
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; !0 = !{!1}
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; !1 = distinct !{!1, !2, !"callee1: %a"}
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; !2 = distinct !{!2, !"callee1"}
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; !3 = !{!1, !4}
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; !4 = distinct !{!4, !5, !"callee0: %a"}
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; !5 = distinct !{!5, !"callee0"}
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; Which is incorrect because the lifetime.end of %src will now "noalias" the above memcpy.
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define i8 @test(i8 %input) {
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%tmp = alloca i8
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%dst = alloca i8
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%src = alloca i8
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; NOTE: we're matching the full line and looking for the lack of !alias.scope here
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; CHECK: call void @llvm.memcpy.p0.p0.i64(ptr align 8 %dst, ptr align 8 %src, i64 1, i1 false)
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call void @llvm.lifetime.start.p0(ptr nonnull %src), !noalias !3
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store i8 %input, ptr %src
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call void @llvm.memcpy.p0.p0.i64(ptr align 8 %tmp, ptr align 8 %src, i64 1, i1 false), !alias.scope !0
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call void @llvm.lifetime.end.p0(ptr nonnull %src), !noalias !3
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call void @llvm.memcpy.p0.p0.i64(ptr align 8 %dst, ptr align 8 %tmp, i64 1, i1 false), !alias.scope !3
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%ret_value = load i8, ptr %dst
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call void @use(ptr %src)
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ret i8 %ret_value
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}
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declare void @llvm.lifetime.start.p0(ptr nocapture)
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declare void @llvm.lifetime.end.p0(ptr nocapture)
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declare void @llvm.memcpy.p0.p0.i64(ptr, ptr, i64, i1)
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!0 = !{!1}
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!1 = distinct !{!1, !2, !"callee0: %a"}
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!2 = distinct !{!2, !"callee0"}
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!3 = !{!4}
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!4 = distinct !{!4, !5, !"callee1: %a"}
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!5 = distinct !{!5, !"callee1"}
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