xref: /freebsd/contrib/llvm-project/libcxx/include/__bit/blsr.h (revision 56b17de1e8360fe131d425de20b5e75ff3ea897c)
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 #ifndef _LIBCPP___BIT_BLSR_H
10 #define _LIBCPP___BIT_BLSR_H
11 
12 #include <__config>
13 
14 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
15 #  pragma GCC system_header
16 #endif
17 
18 _LIBCPP_BEGIN_NAMESPACE_STD
19 
20 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR unsigned __libcpp_blsr(unsigned __x) _NOEXCEPT {
21   return __x ^ (__x & -__x);
22 }
23 
24 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR unsigned long __libcpp_blsr(unsigned long __x) _NOEXCEPT {
25   return __x ^ (__x & -__x);
26 }
27 
28 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR unsigned long long __libcpp_blsr(unsigned long long __x) _NOEXCEPT {
29   return __x ^ (__x & -__x);
30 }
31 
32 _LIBCPP_END_NAMESPACE_STD
33 
34 #endif // _LIBCPP___BIT_BLSR_H
35