derek.holloway
7502bf64a4
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41 lines
1.6 KiB
LLVM
41 lines
1.6 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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; Alias scopes are merged by taking the intersection of domains, then the union of the scopes within those domains
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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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; CHECK: call void @llvm.memcpy.p0.p0.i64(ptr align 8 %dst, ptr align 8 %src, i64 1, i1 false), !alias.scope ![[SCOPE:[0-9]+]]
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call void @llvm.lifetime.start.p0(ptr nonnull %src), !noalias !4
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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 !4
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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 !4
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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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; Merged scope contains "callee0: %a" and "callee0 : %b"
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; CHECK-DAG: ![[CALLEE0_A:[0-9]+]] = distinct !{!{{[0-9]+}}, !{{[0-9]+}}, !"callee0: %a"}
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; CHECK-DAG: ![[CALLEE0_B:[0-9]+]] = distinct !{!{{[0-9]+}}, !{{[0-9]+}}, !"callee0: %b"}
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; CHECK-DAG: ![[SCOPE]] = !{![[CALLEE0_A]], ![[CALLEE0_B]]}
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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, !7}
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!1 = distinct !{!1, !3, !"callee0: %a"}
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!2 = distinct !{!2, !3, !"callee0: %b"}
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!3 = distinct !{!3, !"callee0"}
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!4 = !{!2, !5}
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!5 = distinct !{!5, !6, !"callee1: %a"}
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!6 = distinct !{!6, !"callee1"}
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!7 = distinct !{!7, !8, !"callee2: %a"}
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!8 = distinct !{!8, !"callee2"}
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