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_ROTATE_H 10*4bdff4beSrobert #define _LIBCPP___BIT_ROTATE_H 11*4bdff4beSrobert 12*4bdff4beSrobert #include <__concepts/arithmetic.h> 13*4bdff4beSrobert #include <__config> 14*4bdff4beSrobert #include <__type_traits/is_unsigned_integer.h> 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 template<class _Tp> 24*4bdff4beSrobert _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 __rotr(_Tp __t,unsigned int __cnt)25*4bdff4beSrobert_Tp __rotr(_Tp __t, unsigned int __cnt) _NOEXCEPT 26*4bdff4beSrobert { 27*4bdff4beSrobert static_assert(__libcpp_is_unsigned_integer<_Tp>::value, "__rotr requires an unsigned integer type"); 28*4bdff4beSrobert const unsigned int __dig = numeric_limits<_Tp>::digits; 29*4bdff4beSrobert if ((__cnt % __dig) == 0) 30*4bdff4beSrobert return __t; 31*4bdff4beSrobert return (__t >> (__cnt % __dig)) | (__t << (__dig - (__cnt % __dig))); 32*4bdff4beSrobert } 33*4bdff4beSrobert 34*4bdff4beSrobert #if _LIBCPP_STD_VER >= 20 35*4bdff4beSrobert 36*4bdff4beSrobert template <__libcpp_unsigned_integer _Tp> rotl(_Tp __t,unsigned int __cnt)37*4bdff4beSrobert_LIBCPP_HIDE_FROM_ABI constexpr _Tp rotl(_Tp __t, unsigned int __cnt) noexcept { 38*4bdff4beSrobert const unsigned int __dig = numeric_limits<_Tp>::digits; 39*4bdff4beSrobert if ((__cnt % __dig) == 0) 40*4bdff4beSrobert return __t; 41*4bdff4beSrobert return (__t << (__cnt % __dig)) | (__t >> (__dig - (__cnt % __dig))); 42*4bdff4beSrobert } 43*4bdff4beSrobert 44*4bdff4beSrobert template <__libcpp_unsigned_integer _Tp> rotr(_Tp __t,unsigned int __cnt)45*4bdff4beSrobert_LIBCPP_HIDE_FROM_ABI constexpr _Tp rotr(_Tp __t, unsigned int __cnt) noexcept { 46*4bdff4beSrobert return std::__rotr(__t, __cnt); 47*4bdff4beSrobert } 48*4bdff4beSrobert 49*4bdff4beSrobert #endif // _LIBCPP_STD_VER >= 20 50*4bdff4beSrobert 51*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD 52*4bdff4beSrobert 53*4bdff4beSrobert #endif // _LIBCPP___BIT_ROTATE_H 54