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387f28aff4
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121944 91177308-0d34-0410-b5e6-96231b3b80d8
24 lines
1004 B
LLVM
24 lines
1004 B
LLVM
; RUN: opt -S -tbaa -basicaa -memcpyopt -instcombine < %s | FileCheck %s
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target datalayout = "e-p:64:64:64"
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; The second memcpy is redundant and can be deleted. There's an intervening store, but
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; it has a TBAA tag which declares that it is unrelated.
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; CHECK: @foo
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; CHECK-NEXT: tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %p, i8* %q, i64 16, i32 1, i1 false), !tbaa !0
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; CHECK-NEXT: store i8 2, i8* %s, align 1, !tbaa !2
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; CHECK-NEXT: ret void
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define void @foo(i8* nocapture %p, i8* nocapture %q, i8* nocapture %s) nounwind {
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %p, i8* %q, i64 16, i32 1, i1 false), !tbaa !2
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store i8 2, i8* %s, align 1, !tbaa !1
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %q, i8* %p, i64 16, i32 1, i1 false), !tbaa !2
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ret void
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}
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i32, i1) nounwind
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!0 = metadata !{metadata !"tbaa root", null}
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!1 = metadata !{metadata !"A", metadata !0}
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!2 = metadata !{metadata !"B", metadata !0}
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