elide_memcpy.ll

%struct.S = type { [65536 x i8] }

; Function Attrs: nounwind uwtable
define void @f(%struct.S* noalias nocapture sret, %struct.S* nocapture readonly, %struct.S* nocapture readonly) local_unnamed_addr #0 {
  %4 = alloca %struct.S, align 1
  %5 = getelementptr inbounds %struct.S, %struct.S* %4, i64 0, i32 0, i64 0
  call void @llvm.lifetime.start(i64 65536, i8* %5) #2
  %6 = getelementptr inbounds %struct.S, %struct.S* %1, i64 0, i32 0, i64 0
  %7 = load i8, i8* %6, align 1
  %8 = getelementptr inbounds %struct.S, %struct.S* %2, i64 0, i32 0, i64 0
  %9 = load i8, i8* %8, align 1
  %10 = xor i8 %9, %7
  store i8 %10, i8* %5, align 1
  %11 = getelementptr inbounds %struct.S, %struct.S* %0, i64 0, i32 0, i64 0
  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %11, i8* %5, i64 65536, i32 1, i1 false)
  call void @llvm.lifetime.end(i64 65536, i8* %5) #2
  ret void
}

; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.start(i64, i8* nocapture)

; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.end(i64, i8* nocapture)

; Function Attrs: argmemonly nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i32, i1)