1; Test that the strcspn library call simplifier works correctly.
2;
3; RUN: opt < %s -instcombine -S | FileCheck %s
4
5target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
6
7@abcba = constant [6 x i8] c"abcba\00"
8@abc = constant [4 x i8] c"abc\00"
9@null = constant [1 x i8] zeroinitializer
10
11declare i64 @strcspn(i8*, i8*)
12
13; Check strcspn(s, "") -> strlen(s).
14
15define i64 @test_simplify1(i8* %str) {
16; CHECK-LABEL: @test_simplify1(
17  %pat = getelementptr [1 x i8], [1 x i8]* @null, i32 0, i32 0
18
19  %ret = call i64 @strcspn(i8* %str, i8* %pat)
20; CHECK-NEXT: [[VAR:%[a-z]+]] = call i64 @strlen(i8* %str)
21  ret i64 %ret
22; CHECK-NEXT: ret i64 [[VAR]]
23}
24
25; Check strcspn("", s) -> 0.
26
27define i64 @test_simplify2(i8* %pat) {
28; CHECK-LABEL: @test_simplify2(
29  %str = getelementptr [1 x i8], [1 x i8]* @null, i32 0, i32 0
30
31  %ret = call i64 @strcspn(i8* %str, i8* %pat)
32  ret i64 %ret
33; CHECK-NEXT: ret i64 0
34}
35
36; Check strcspn(s1, s2), where s1 and s2 are constants.
37
38define i64 @test_simplify3() {
39; CHECK-LABEL: @test_simplify3(
40  %str = getelementptr [6 x i8], [6 x i8]* @abcba, i32 0, i32 0
41  %pat = getelementptr [4 x i8], [4 x i8]* @abc, i32 0, i32 0
42
43  %ret = call i64 @strcspn(i8* %str, i8* %pat)
44  ret i64 %ret
45; CHECK-NEXT: ret i64 0
46}
47
48; Check cases that shouldn't be simplified.
49
50define i64 @test_no_simplify1(i8* %str, i8* %pat) {
51; CHECK-LABEL: @test_no_simplify1(
52
53  %ret = call i64 @strcspn(i8* %str, i8* %pat)
54; CHECK-NEXT: %ret = call i64 @strcspn(i8* %str, i8* %pat)
55  ret i64 %ret
56; CHECK-NEXT: ret i64 %ret
57}
58