1*4bdff4beSrobert //===----------------------------------------------------------------------===// 2*4bdff4beSrobert // 3*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information. 5*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*4bdff4beSrobert // 7*4bdff4beSrobert //===----------------------------------------------------------------------===// 8*4bdff4beSrobert 9*4bdff4beSrobert #ifndef _LIBCPP___BIT_BIT_FLOOR_H 10*4bdff4beSrobert #define _LIBCPP___BIT_BIT_FLOOR_H 11*4bdff4beSrobert 12*4bdff4beSrobert #include <__bit/bit_log2.h> 13*4bdff4beSrobert #include <__concepts/arithmetic.h> 14*4bdff4beSrobert #include <__config> 15*4bdff4beSrobert #include <limits> 16*4bdff4beSrobert 17*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18*4bdff4beSrobert # pragma GCC system_header 19*4bdff4beSrobert #endif 20*4bdff4beSrobert 21*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD 22*4bdff4beSrobert 23*4bdff4beSrobert #if _LIBCPP_STD_VER >= 20 24*4bdff4beSrobert 25*4bdff4beSrobert template <__libcpp_unsigned_integer _Tp> bit_floor(_Tp __t)26*4bdff4beSrobert_LIBCPP_HIDE_FROM_ABI constexpr _Tp bit_floor(_Tp __t) noexcept { 27*4bdff4beSrobert return __t == 0 ? 0 : _Tp{1} << std::__bit_log2(__t); 28*4bdff4beSrobert } 29*4bdff4beSrobert 30*4bdff4beSrobert #endif // _LIBCPP_STD_VER >= 20 31*4bdff4beSrobert 32*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD 33*4bdff4beSrobert 34*4bdff4beSrobert #endif // _LIBCPP___BIT_BIT_FLOOR_H 35