forked from OSchip/llvm-project
26 lines
949 B
LLVM
26 lines
949 B
LLVM
; RUN: opt < %s -O1 -S | FileCheck %s
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; performCallSlotOptzn in MemCpy should not exchange the calls to
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; @llvm.lifetime.start and @llvm.memcpy.
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) #1
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declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
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declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
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define void @_ZN4CordC2EOS_(i8* nocapture dereferenceable(16) %arg1) {
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bb:
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; CHECK-LABEL: @_ZN4CordC2EOS_
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; CHECK-NOT: call void @llvm.lifetime.start
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; CHECK: ret void
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%tmp = alloca [8 x i8], align 8
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%tmp5 = bitcast [8 x i8]* %tmp to i8*
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call void @llvm.lifetime.start.p0i8(i64 16, i8* %tmp5)
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%tmp10 = getelementptr inbounds i8, i8* %tmp5, i64 7
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store i8 0, i8* %tmp10, align 1
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %arg1, i8* %tmp5, i64 16, i32 8, i1 false)
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call void @llvm.lifetime.end.p0i8(i64 16, i8* %tmp5)
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ret void
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}
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attributes #1 = { argmemonly nounwind }
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