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_INLINE_VISIBILITY _LIBCPP_CONSTEXPR unsigned __libcpp_blsr(unsigned __x) _NOEXCEPT { 21 return __x ^ (__x & -__x); 22 } 23 24 inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR unsigned long __libcpp_blsr(unsigned long __x) _NOEXCEPT { 25 return __x ^ (__x & -__x); 26 } 27 28 inline _LIBCPP_INLINE_VISIBILITY _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