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51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
/*
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* Copyright 2016 Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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namespace folly {
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namespace detail {
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// If we're targeting an architecture with popcnt support, use
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// __builtin_popcount directly, as it's presumably inlined.
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// If not, use runtime detection using __attribute__((__ifunc__))
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// (see Bits.cpp)
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#ifdef _MSC_VER
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inline int popcount(unsigned int x) {
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return __popcnt(x);
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}
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inline int popcountll(unsigned long long x) {
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return __popcnt64(x);
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}
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#elif defined(__POPCNT__)
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inline int popcount(unsigned int x) {
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return __builtin_popcount(x);
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}
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inline int popcountll(unsigned long long x) {
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return __builtin_popcountll(x);
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}
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#else /* !__POPCNT__ */
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int popcount(unsigned int x);
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int popcountll(unsigned long long x);
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#endif /* !__POPCNT__ */
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} // namespace detail
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} // namespace folly
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