1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt < %s -instcombine -S | FileCheck %s
3
4
5@str = constant [2 x i8] c"a\00"
6@str2 = constant [3 x i8] c"abc"
7@str3 = constant [4 x i8] c"abcd"
8
9declare i8* @strncpy(i8*, i8*, i64)
10
11
12define void @fill_with_zeros(i8* %dst) {
13; CHECK-LABEL: @fill_with_zeros(
14; CHECK-NEXT:    [[TMP1:%.*]] = bitcast i8* [[DST:%.*]] to i32*
15; CHECK-NEXT:    store i32 97, i32* [[TMP1]], align 1
16; CHECK-NEXT:    ret void
17;
18  tail call i8* @strncpy(i8* %dst, i8* getelementptr inbounds ([2 x i8], [2 x i8]* @str, i64 0, i64 0), i64 4)
19  ret void
20}
21
22define void @fill_with_zeros2(i8* %dst) {
23; CHECK-LABEL: @fill_with_zeros2(
24; CHECK-NEXT:    [[TMP1:%.*]] = bitcast i8* [[DST:%.*]] to i32*
25; CHECK-NEXT:    store i32 6513249, i32* [[TMP1]], align 1
26; CHECK-NEXT:    ret void
27;
28  tail call i8* @strncpy(i8* %dst, i8* getelementptr inbounds ([3 x i8], [3 x i8]* @str2, i64 0, i64 0), i64 4)
29  ret void
30}
31
32define void @fill_with_zeros3(i8* %dst) {
33; CHECK-LABEL: @fill_with_zeros3(
34; CHECK-NEXT:    [[TMP1:%.*]] = bitcast i8* [[DST:%.*]] to i32*
35; CHECK-NEXT:    store i32 1684234849, i32* [[TMP1]], align 1
36; CHECK-NEXT:    ret void
37;
38  tail call i8* @strncpy(i8* %dst, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @str3, i64 0, i64 0), i64 4)
39  ret void
40}
41
42define void @fill_with_zeros4(i8* %dst) {
43; CHECK-LABEL: @fill_with_zeros4(
44; CHECK-NEXT:    call void @llvm.memcpy.p0i8.p0i8.i64(i8* nonnull align 1 dereferenceable(128) [[DST:%.*]], i8* nonnull align 1 dereferenceable(128) getelementptr inbounds ([129 x i8], [129 x i8]* @str.2, i64 0, i64 0), i64 128, i1 false)
45; CHECK-NEXT:    ret void
46;
47  tail call i8* @strncpy(i8* %dst, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @str3, i64 0, i64 0), i64 128)
48  ret void
49}
50
51define void @no_simplify(i8* %dst) {
52; CHECK-LABEL: @no_simplify(
53; CHECK-NEXT:    [[TMP1:%.*]] = tail call i8* @strncpy(i8* nonnull dereferenceable(1) [[DST:%.*]], i8* nonnull dereferenceable(5) getelementptr inbounds ([4 x i8], [4 x i8]* @str3, i64 0, i64 0), i64 129)
54; CHECK-NEXT:    ret void
55;
56  tail call i8* @strncpy(i8* %dst, i8* getelementptr inbounds ([4 x i8], [4 x i8]* @str3, i64 0, i64 0), i64 129)
57  ret void
58}
59