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 // TODO: __builtin_popcountg is available since Clang 19 and GCC 14. When support for older versions is dropped, we can 10 // refactor this code to exclusively use __builtin_popcountg. 11 12 #ifndef _LIBCPP___CXX03___BIT_POPCOUNT_H 13 #define _LIBCPP___CXX03___BIT_POPCOUNT_H 14 15 #include <__cxx03/__bit/rotate.h> 16 #include <__cxx03/__config> 17 #include <__cxx03/limits> 18 19 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 20 # pragma GCC system_header 21 #endif 22 23 _LIBCPP_PUSH_MACROS 24 #include <__cxx03/__undef_macros> 25 26 _LIBCPP_BEGIN_NAMESPACE_STD 27 __libcpp_popcount(unsigned __x)28inline _LIBCPP_HIDE_FROM_ABI int __libcpp_popcount(unsigned __x) _NOEXCEPT { return __builtin_popcount(__x); } 29 __libcpp_popcount(unsigned long __x)30inline _LIBCPP_HIDE_FROM_ABI int __libcpp_popcount(unsigned long __x) _NOEXCEPT { return __builtin_popcountl(__x); } 31 __libcpp_popcount(unsigned long long __x)32inline _LIBCPP_HIDE_FROM_ABI int __libcpp_popcount(unsigned long long __x) _NOEXCEPT { 33 return __builtin_popcountll(__x); 34 } 35 36 _LIBCPP_END_NAMESPACE_STD 37 38 _LIBCPP_POP_MACROS 39 40 #endif // _LIBCPP___CXX03___BIT_POPCOUNT_H 41