56 lines
1.4 KiB
C++
56 lines
1.4 KiB
C++
/*
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* This file is open source software, licensed to you under the terms
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* of the Apache License, Version 2.0 (the "License"). See the NOTICE file
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* distributed with this work for additional information regarding copyright
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* ownership. You may not use this file except in compliance with the License.
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*
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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,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/*
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* Copyright (C) 2014 Cloudius Systems, Ltd.
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*/
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#ifndef BITOPS_HH_
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#define BITOPS_HH_
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inline
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constexpr unsigned count_leading_zeros(unsigned x) {
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return __builtin_clz(x);
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}
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inline
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constexpr unsigned count_leading_zeros(unsigned long x) {
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return __builtin_clzl(x);
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}
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inline
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constexpr unsigned count_leading_zeros(unsigned long long x) {
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return __builtin_clzll(x);
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}
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inline
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constexpr unsigned count_trailing_zeros(unsigned x) {
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return __builtin_ctz(x);
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}
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inline
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constexpr unsigned count_trailing_zeros(unsigned long x) {
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return __builtin_ctzl(x);
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}
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inline
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constexpr unsigned count_trailing_zeros(unsigned long long x) {
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return __builtin_ctzll(x);
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}
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#endif /* BITOPS_HH_ */
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