; RUN: opt -basic-aa -dse -enable-dse-memoryssa=false -S < %s | FileCheck %s

declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture, i64, i1) nounwind

define void @fn(i8* nocapture %buf) #0 {
entry:

; We would not eliminate the first memcpy with data layout, and we should not
; eliminate it without data layout.
; CHECK-LABEL: @fn
; CHECK: tail call void @llvm.memcpy.p0i8.p0i8.i64
; CHECK: tail call void @llvm.memcpy.p0i8.p0i8.i64
; CHECK: ret void

  %arrayidx = getelementptr i8, i8* %buf, i64 18
  tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %arrayidx, i8* %buf, i64 18, i1 false)
  store i8 1, i8* %arrayidx, align 1
  tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* %buf, i8* %arrayidx, i64 18, i1 false)
  ret void
}