1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; Test that the strcspn library call simplifier works correctly.
4 ; RUN: opt < %s -instcombine -S | FileCheck %s
6 target 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"
8 @abcba = constant [6 x i8] c"abcba\00"
9 @abc = constant [4 x i8] c"abc\00"
10 @null = constant [1 x i8] zeroinitializer
12 declare i64 @strcspn(i8*, i8*)
14 ; Check strcspn(s, "") -> strlen(s).
16 define i64 @test_simplify1(i8* %str) {
17 ; CHECK-LABEL: @test_simplify1(
18 ; CHECK-NEXT: [[STRLEN:%.*]] = call i64 @strlen(i8* nonnull dereferenceable(1) [[STR:%.*]])
19 ; CHECK-NEXT: ret i64 [[STRLEN]]
21 %pat = getelementptr [1 x i8], [1 x i8]* @null, i32 0, i32 0
23 %ret = call i64 @strcspn(i8* %str, i8* %pat)
27 ; Check strcspn("", s) -> 0.
29 define i64 @test_simplify2(i8* %pat) {
30 ; CHECK-LABEL: @test_simplify2(
31 ; CHECK-NEXT: ret i64 0
33 %str = getelementptr [1 x i8], [1 x i8]* @null, i32 0, i32 0
35 %ret = call i64 @strcspn(i8* %str, i8* %pat)
39 ; Check strcspn(s1, s2), where s1 and s2 are constants.
41 define i64 @test_simplify3() {
42 ; CHECK-LABEL: @test_simplify3(
43 ; CHECK-NEXT: ret i64 0
45 %str = getelementptr [6 x i8], [6 x i8]* @abcba, i32 0, i32 0
46 %pat = getelementptr [4 x i8], [4 x i8]* @abc, i32 0, i32 0
48 %ret = call i64 @strcspn(i8* %str, i8* %pat)
52 ; Check cases that shouldn't be simplified.
54 define i64 @test_no_simplify1(i8* %str, i8* %pat) {
55 ; CHECK-LABEL: @test_no_simplify1(
56 ; CHECK-NEXT: [[RET:%.*]] = call i64 @strcspn(i8* [[STR:%.*]], i8* [[PAT:%.*]])
57 ; CHECK-NEXT: ret i64 [[RET]]
60 %ret = call i64 @strcspn(i8* %str, i8* %pat)