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 -passes=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(ptr, ptr)
14 ; Check strcspn(s, "") -> strlen(s).
16 define i64 @test_simplify1(ptr %str) {
17 ; CHECK-LABEL: @test_simplify1(
18 ; CHECK-NEXT: [[STRLEN:%.*]] = call i64 @strlen(ptr noundef nonnull dereferenceable(1) [[STR:%.*]])
19 ; CHECK-NEXT: ret i64 [[STRLEN]]
22 %ret = call i64 @strcspn(ptr %str, ptr @null)
26 ; Check strcspn("", s) -> 0.
28 define i64 @test_simplify2(ptr %pat) {
29 ; CHECK-LABEL: @test_simplify2(
30 ; CHECK-NEXT: ret i64 0
33 %ret = call i64 @strcspn(ptr @null, ptr %pat)
37 ; Check strcspn(s1, s2), where s1 and s2 are constants.
39 define i64 @test_simplify3() {
40 ; CHECK-LABEL: @test_simplify3(
41 ; CHECK-NEXT: ret i64 0
44 %ret = call i64 @strcspn(ptr @abcba, ptr @abc)
48 ; Check cases that shouldn't be simplified.
50 define i64 @test_no_simplify1(ptr %str, ptr %pat) {
51 ; CHECK-LABEL: @test_no_simplify1(
52 ; CHECK-NEXT: [[RET:%.*]] = call i64 @strcspn(ptr [[STR:%.*]], ptr [[PAT:%.*]])
53 ; CHECK-NEXT: ret i64 [[RET]]
56 %ret = call i64 @strcspn(ptr %str, ptr %pat)