1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// Test the __XXXX routines in the <bit> header.
10// These are not supposed to be exhaustive tests, just sanity checks.
11
12#include <__bit/bit_log2.h>
13#include <__bit/countl.h>
14#include <__bit/rotate.h>
15#include <cassert>
16
17#include "test_macros.h"
18
19TEST_CONSTEXPR_CXX14 bool test() {
20 const unsigned v = 0x12345678;
21
22 ASSERT_SAME_TYPE(unsigned, decltype(std::__rotr(v, 3)));
23 ASSERT_SAME_TYPE(int, decltype(std::__countl_zero(v)));
24
25 assert(std::__rotr(v, 3) == 0x02468acfU);
26 assert(std::__countl_zero(v) == 3);
27
28#if TEST_STD_VER > 17
29 ASSERT_SAME_TYPE(unsigned, decltype(std::__bit_log2(v)));
30 assert(std::__bit_log2(v) == 28);
31#endif
32
33 return true;
34}
35
36int main(int, char**) {
37 test();
38#if TEST_STD_VER > 11
39 static_assert(test(), "");
40#endif
41
42 return 0;
43}
44

source code of libcxx/test/libcxx/numerics/bit.ops.pass.cpp