176d0caaeSpatrick //===----------------------------------------------------------------------===// 276d0caaeSpatrick // 376d0caaeSpatrick // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 476d0caaeSpatrick // See https://llvm.org/LICENSE.txt for license information. 576d0caaeSpatrick // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 676d0caaeSpatrick // 776d0caaeSpatrick //===----------------------------------------------------------------------===// 876d0caaeSpatrick 976d0caaeSpatrick #ifndef _LIBCPP___ALGORITHM_HALF_POSITIVE_H 1076d0caaeSpatrick #define _LIBCPP___ALGORITHM_HALF_POSITIVE_H 1176d0caaeSpatrick 1276d0caaeSpatrick #include <__config> 1376d0caaeSpatrick #include <type_traits> 1476d0caaeSpatrick 1576d0caaeSpatrick #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 1676d0caaeSpatrick # pragma GCC system_header 1776d0caaeSpatrick #endif 1876d0caaeSpatrick 1976d0caaeSpatrick _LIBCPP_BEGIN_NAMESPACE_STD 2076d0caaeSpatrick 2176d0caaeSpatrick // Perform division by two quickly for positive integers (llvm.org/PR39129) 2276d0caaeSpatrick 2376d0caaeSpatrick template <typename _Integral> 2476d0caaeSpatrick _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 2576d0caaeSpatrick typename enable_if 2676d0caaeSpatrick < 2776d0caaeSpatrick is_integral<_Integral>::value, 2876d0caaeSpatrick _Integral 2976d0caaeSpatrick >::type __half_positive(_Integral __value)3076d0caaeSpatrick__half_positive(_Integral __value) 3176d0caaeSpatrick { 32*4bdff4beSrobert return static_cast<_Integral>(static_cast<__make_unsigned_t<_Integral> >(__value) / 2); 3376d0caaeSpatrick } 3476d0caaeSpatrick 3576d0caaeSpatrick template <typename _Tp> 3676d0caaeSpatrick _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR 3776d0caaeSpatrick typename enable_if 3876d0caaeSpatrick < 3976d0caaeSpatrick !is_integral<_Tp>::value, 4076d0caaeSpatrick _Tp 4176d0caaeSpatrick >::type __half_positive(_Tp __value)4276d0caaeSpatrick__half_positive(_Tp __value) 4376d0caaeSpatrick { 4476d0caaeSpatrick return __value / 2; 4576d0caaeSpatrick } 4676d0caaeSpatrick 4776d0caaeSpatrick _LIBCPP_END_NAMESPACE_STD 4876d0caaeSpatrick 4976d0caaeSpatrick #endif // _LIBCPP___ALGORITHM_HALF_POSITIVE_H 50