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