1; RUN: opt -basicaa -memcpyopt -instcombine -S < %s | FileCheck %s
2
3target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
4target triple = "x86_64-unknown-linux-gnu"
5
6define void @foo([8 x i64]* noalias nocapture sret dereferenceable(64) %sret) {
7entry-block:
8  %a = alloca [8 x i64], align 8
9  %a.cast = bitcast [8 x i64]* %a to i8*
10  call void @llvm.lifetime.start(i64 64, i8* %a.cast)
11  call void @llvm.memset.p0i8.i64(i8* %a.cast, i8 0, i64 64, i32 8, i1 false)
12  %sret.cast = bitcast [8 x i64]* %sret to i8*
13  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %sret.cast, i8* %a.cast, i64 64, i32 8, i1 false)
14  call void @llvm.lifetime.end(i64 64, i8* %a.cast)
15  ret void
16
17; CHECK-LABEL: @foo(
18; CHECK:         %[[sret_cast:[^=]+]] = bitcast [8 x i64]* %sret to i8*
19; CHECK-NEXT:    call void @llvm.memset.p0i8.i64(i8* %[[sret_cast]], i8 0, i64 64
20; CHECK-NOT: call void @llvm.memcpy
21; CHECK: ret void
22}
23
24define void @bar([8 x i64]* noalias nocapture sret dereferenceable(64) %sret, [8 x i64]* noalias nocapture dereferenceable(64) %out) {
25entry-block:
26  %a = alloca [8 x i64], align 8
27  %a.cast = bitcast [8 x i64]* %a to i8*
28  call void @llvm.lifetime.start(i64 64, i8* %a.cast)
29  call void @llvm.memset.p0i8.i64(i8* %a.cast, i8 0, i64 64, i32 8, i1 false)
30  %sret.cast = bitcast [8 x i64]* %sret to i8*
31  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %sret.cast, i8* %a.cast, i64 64, i32 8, i1 false)
32  call void @llvm.memset.p0i8.i64(i8* %a.cast, i8 42, i64 32, i32 8, i1 false)
33  %out.cast = bitcast [8 x i64]* %out to i8*
34  call void @llvm.memcpy.p0i8.p0i8.i64(i8* %out.cast, i8* %a.cast, i64 64, i32 8, i1 false)
35  call void @llvm.lifetime.end(i64 64, i8* %a.cast)
36  ret void
37
38; CHECK-LABEL: @bar(
39; CHECK:         %[[a:[^=]+]] = alloca [8 x i64]
40; CHECK:         %[[a_cast:[^=]+]] = bitcast [8 x i64]* %[[a]] to i8*
41; CHECK:         call void @llvm.memset.p0i8.i64(i8* %[[a_cast]], i8 0, i64 64
42; CHECK:         %[[sret_cast:[^=]+]] = bitcast [8 x i64]* %sret to i8*
43; CHECK:         call void @llvm.memcpy.p0i8.p0i8.i64(i8* %[[sret_cast]], i8* %[[a_cast]], i64 64
44; CHECK:         call void @llvm.memset.p0i8.i64(i8* %[[a_cast]], i8 42, i64 32
45; CHECK:         %[[out_cast:[^=]+]] = bitcast [8 x i64]* %out to i8*
46; CHECK:         call void @llvm.memcpy.p0i8.p0i8.i64(i8* %[[out_cast]], i8* %[[a_cast]], i64 64
47; CHECK-NOT: call void @llvm.memcpy
48; CHECK: ret void
49}
50
51declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
52declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
53
54declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) nounwind
55declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
56