1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; Verify that strlen calls with variable offsets into elements of constant
3; arrays are folded.
4;
5; RUN: opt < %s -passes=instcombine -S | FileCheck %s
6
7declare i64 @strlen(i8*)
8
9@a5_4 = constant [5 x [4 x i8]] [[4 x i8] c"123\00", [4 x i8] c"12\00\00", [4 x i8] c"1\00\00\00", [4 x i8] zeroinitializer, [4 x i8] zeroinitializer]
10
11
12; Fold strlen(&a5_4[0][I]) to I <= 3 ? 3 - I : 0.
13
14define i64 @fold_a5_4_i0_pI(i64 %I) {
15; CHECK-LABEL: @fold_a5_4_i0_pI(
16; CHECK-NEXT:    [[PTR:%.*]] = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 0, i64 [[I:%.*]]
17; CHECK-NEXT:    [[LEN:%.*]] = call i64 @strlen(i8* noundef nonnull dereferenceable(1) [[PTR]])
18; CHECK-NEXT:    ret i64 [[LEN]]
19;
20  %ptr = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 0, i64 %I
21  %len = call i64 @strlen(i8* %ptr)
22  ret i64 %len
23}
24
25
26; Fold strlen(&a5_4[1][I]) to I <= 2 ? 2 - I : 0.
27
28define i64 @fold_a5_4_i1_pI(i64 %I) {
29; CHECK-LABEL: @fold_a5_4_i1_pI(
30; CHECK-NEXT:    [[PTR:%.*]] = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 1, i64 [[I:%.*]]
31; CHECK-NEXT:    [[LEN:%.*]] = call i64 @strlen(i8* noundef nonnull dereferenceable(1) [[PTR]])
32; CHECK-NEXT:    ret i64 [[LEN]]
33;
34  %ptr = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 1, i64 %I
35  %len = call i64 @strlen(i8* %ptr)
36  ret i64 %len
37}
38
39
40; Fold strlen(&a5_4[2][I]) to i <= 1 ? 1 - I : 0.
41
42define i64 @fold_a5_4_i2_pI(i64 %I) {
43; CHECK-LABEL: @fold_a5_4_i2_pI(
44; CHECK-NEXT:    [[LEN:%.*]] = call i64 @strlen(i8* noundef nonnull dereferenceable(1) getelementptr inbounds ([5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 2, i64 1))
45; CHECK-NEXT:    ret i64 [[LEN]]
46;
47  %ptr = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 2, i64 1
48  %len = call i64 @strlen(i8* %ptr)
49  ret i64 %len
50}
51
52
53; Fold strlen(&a5_4[3][I]) to 0.
54
55define i64 @fold_a5_4_i3_pI_to_0(i64 %I) {
56; CHECK-LABEL: @fold_a5_4_i3_pI_to_0(
57; CHECK-NEXT:    [[PTR:%.*]] = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 3, i64 [[I:%.*]]
58; CHECK-NEXT:    [[LEN:%.*]] = call i64 @strlen(i8* noundef nonnull dereferenceable(1) [[PTR]])
59; CHECK-NEXT:    ret i64 [[LEN]]
60;
61  %ptr = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 3, i64 %I
62  %len = call i64 @strlen(i8* %ptr)
63  ret i64 %len
64}
65
66
67; Fold strlen(&a5_4[4][I]) to 0.
68
69define i64 @fold_a5_4_i4_pI_to_0(i64 %I) {
70; CHECK-LABEL: @fold_a5_4_i4_pI_to_0(
71; CHECK-NEXT:    [[PTR:%.*]] = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 4, i64 [[I:%.*]]
72; CHECK-NEXT:    [[LEN:%.*]] = call i64 @strlen(i8* noundef nonnull dereferenceable(1) [[PTR]])
73; CHECK-NEXT:    ret i64 [[LEN]]
74;
75  %ptr = getelementptr [5 x [4 x i8]], [5 x [4 x i8]]* @a5_4, i64 0, i64 4, i64 %I
76  %len = call i64 @strlen(i8* %ptr)
77  ret i64 %len
78}
79