1; RUN: opt < %s -basicaa -dse -S | FileCheck %s
2
3define void @write4to7(i32* nocapture %p) {
4; CHECK-LABEL: @write4to7(
5entry:
6  %arrayidx0 = getelementptr inbounds i32, i32* %p, i64 1
7  %p3 = bitcast i32* %arrayidx0 to i8*
8; CHECK: [[GEP:%[0-9]+]] = getelementptr inbounds i8, i8* %p3, i64 4
9; CHECK: call void @llvm.memset.p0i8.i64(i8* [[GEP]], i8 0, i64 24, i32 4, i1 false)
10  call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 28, i32 4, i1 false)
11  %arrayidx1 = getelementptr inbounds i32, i32* %p, i64 1
12  store i32 1, i32* %arrayidx1, align 4
13  ret void
14}
15
16define void @write0to3(i32* nocapture %p) {
17; CHECK-LABEL: @write0to3(
18entry:
19  %p3 = bitcast i32* %p to i8*
20; CHECK: [[GEP:%[0-9]+]] = getelementptr inbounds i8, i8* %p3, i64 4
21; CHECK: call void @llvm.memset.p0i8.i64(i8* [[GEP]], i8 0, i64 24, i32 4, i1 false)
22  call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 28, i32 4, i1 false)
23  store i32 1, i32* %p, align 4
24  ret void
25}
26
27define void @write0to7(i32* nocapture %p) {
28; CHECK-LABEL: @write0to7(
29entry:
30  %p3 = bitcast i32* %p to i8*
31; CHECK: [[GEP:%[0-9]+]] = getelementptr inbounds i8, i8* %p3, i64 8
32; CHECK: call void @llvm.memset.p0i8.i64(i8* [[GEP]], i8 0, i64 24, i32 4, i1 false)
33  call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 32, i32 4, i1 false)
34  %p4 = bitcast i32* %p to i64*
35  store i64 1, i64* %p4, align 8
36  ret void
37}
38
39define void @write0to7_2(i32* nocapture %p) {
40; CHECK-LABEL: @write0to7_2(
41entry:
42  %arrayidx0 = getelementptr inbounds i32, i32* %p, i64 1
43  %p3 = bitcast i32* %arrayidx0 to i8*
44; CHECK: [[GEP:%[0-9]+]] = getelementptr inbounds i8, i8* %p3, i64 4
45; CHECK: call void @llvm.memset.p0i8.i64(i8* [[GEP]], i8 0, i64 24, i32 4, i1 false)
46  call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 28, i32 4, i1 false)
47  %p4 = bitcast i32* %p to i64*
48  store i64 1, i64* %p4, align 8
49  ret void
50}
51
52; We do not trim the beginning of the eariler write if the alignment of the
53; start pointer is changed.
54define void @dontwrite0to3_align8(i32* nocapture %p) {
55; CHECK-LABEL: @dontwrite0to3_align8(
56entry:
57  %p3 = bitcast i32* %p to i8*
58; CHECK: call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 32, i32 8, i1 false)
59  call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 32, i32 8, i1 false)
60  store i32 1, i32* %p, align 4
61  ret void
62}
63
64define void @dontwrite0to1(i32* nocapture %p) {
65; CHECK-LABEL: @dontwrite0to1(
66entry:
67  %p3 = bitcast i32* %p to i8*
68; CHECK: call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 32, i32 4, i1 false)
69  call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 32, i32 4, i1 false)
70  %p4 = bitcast i32* %p to i16*
71  store i16 1, i16* %p4, align 4
72  ret void
73}
74
75define void @dontwrite2to9(i32* nocapture %p) {
76; CHECK-LABEL: @dontwrite2to9(
77entry:
78  %arrayidx0 = getelementptr inbounds i32, i32* %p, i64 1
79  %p3 = bitcast i32* %arrayidx0 to i8*
80; CHECK: call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 32, i32 4, i1 false)
81  call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 32, i32 4, i1 false)
82  %p4 = bitcast i32* %p to i16*
83  %arrayidx2 = getelementptr inbounds i16, i16* %p4, i64 1
84  %p5 = bitcast i16* %arrayidx2 to i64*
85  store i64 1, i64* %p5, align 8
86  ret void
87}
88
89declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
90
91