1; RUN: opt < %s -S -basicaa -memcpyopt | FileCheck %s
2target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
3
4declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) unnamed_addr nounwind
5declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
6
7; all bytes of %dst that are touch by the memset are dereferenceable
8define void @must_remove_memcpy(i8* noalias nocapture dereferenceable(4096) %dst) {
9; CHECK-LABEL: @must_remove_memcpy(
10; CHECK: call void @llvm.memset.p0i8.i64
11; CHECK-NOT: call void @llvm.memcpy.p0i8.p0i8.i64
12  %src = alloca [4096 x i8], align 1
13  %p = getelementptr inbounds [4096 x i8], [4096 x i8]* %src, i64 0, i64 0
14  call void @llvm.memset.p0i8.i64(i8* %p, i8 0, i64 4096, i32 1, i1 false)
15  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dst, i8* %p, i64 4096, i32 1, i1 false) #2
16  ret void
17}
18
19; memset touch more bytes than those guaranteed to be dereferenceable
20define void @must_not_remove_memcpy(i8* noalias nocapture dereferenceable(1024) %dst) {
21; CHECK-LABEL: @must_not_remove_memcpy(
22; CHECK: call void @llvm.memset.p0i8.i64
23; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64
24  %src = alloca [4096 x i8], align 1
25  %p = getelementptr inbounds [4096 x i8], [4096 x i8]* %src, i64 0, i64 0
26  call void @llvm.memset.p0i8.i64(i8* %p, i8 0, i64 4096, i32 1, i1 false)
27  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %dst, i8* %p, i64 4096, i32 1, i1 false) #2
28  ret void
29}
30