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65 lines
1.9 KiB
C
Executable File
65 lines
1.9 KiB
C
Executable File
/*
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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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#ifdef _WIN32
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#include <assert.h>
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#include <intrin.h>
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#include <folly/Portability.h>
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FOLLY_ALWAYS_INLINE int __builtin_clz(unsigned int x) {
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unsigned long index;
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return (int)(_BitScanReverse(&index, (unsigned long)x) ? 31 - index : 32);
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}
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FOLLY_ALWAYS_INLINE int __builtin_clzl(unsigned long x) {
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return __builtin_clz((unsigned int)x);
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}
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FOLLY_ALWAYS_INLINE int __builtin_clzll(unsigned long long x) {
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unsigned long index;
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return (int)(_BitScanReverse64(&index, x) ? 63 - index : 64);
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}
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FOLLY_ALWAYS_INLINE int __builtin_ctzll(unsigned long long x) {
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unsigned long index;
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return (int)(_BitScanForward64(&index, x) ? index : 64);
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}
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FOLLY_ALWAYS_INLINE int __builtin_ffs(int x) {
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unsigned long index;
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return (int)(_BitScanForward(&index, (unsigned long)x) ? index + 1 : 0);
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}
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FOLLY_ALWAYS_INLINE int __builtin_ffsl(long x) { return __builtin_ffs((int)x); }
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FOLLY_ALWAYS_INLINE int __builtin_ffsll(long long x) {
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unsigned long index;
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return (int)(_BitScanForward64(&index, (unsigned long long)x) ? index + 1 : 0);
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}
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FOLLY_ALWAYS_INLINE int __builtin_popcountll(unsigned long long x) {
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return (int)__popcnt64(x);
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}
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FOLLY_ALWAYS_INLINE void* __builtin_return_address(unsigned int frame) {
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// I really hope frame is zero...
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assert(frame == 0);
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return _ReturnAddress();
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}
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#endif
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