| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___BIT_ROTATE_H |
| #define _LIBCPP___BIT_ROTATE_H |
| |
| #include <__concepts/arithmetic.h> |
| #include <__config> |
| #include <__type_traits/is_unsigned_integer.h> |
| #include <limits> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template<class _Tp> |
| _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 |
| _Tp __rotr(_Tp __t, unsigned int __cnt) _NOEXCEPT |
| { |
| static_assert(__libcpp_is_unsigned_integer<_Tp>::value, "__rotr requires an unsigned integer type"); |
| const unsigned int __dig = numeric_limits<_Tp>::digits; |
| if ((__cnt % __dig) == 0) |
| return __t; |
| return (__t >> (__cnt % __dig)) | (__t << (__dig - (__cnt % __dig))); |
| } |
| |
| #if _LIBCPP_STD_VER >= 20 |
| |
| template <__libcpp_unsigned_integer _Tp> |
| _LIBCPP_HIDE_FROM_ABI constexpr _Tp rotl(_Tp __t, unsigned int __cnt) noexcept { |
| const unsigned int __dig = numeric_limits<_Tp>::digits; |
| if ((__cnt % __dig) == 0) |
| return __t; |
| return (__t << (__cnt % __dig)) | (__t >> (__dig - (__cnt % __dig))); |
| } |
| |
| template <__libcpp_unsigned_integer _Tp> |
| _LIBCPP_HIDE_FROM_ABI constexpr _Tp rotr(_Tp __t, unsigned int __cnt) noexcept { |
| return std::__rotr(__t, __cnt); |
| } |
| |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___BIT_ROTATE_H |