106 lines
3.0 KiB
C++
106 lines
3.0 KiB
C++
/*
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* Copyright 2016-present 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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#if defined(_WIN32) && !defined(__clang__)
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#include <assert.h>
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#include <folly/Portability.h>
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#include <intrin.h>
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#include <stdint.h>
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namespace folly {
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namespace portability {
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namespace detail {
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void call_flush_instruction_cache_self_pid(void* begin, size_t size);
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}
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} // namespace portability
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} // namespace folly
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FOLLY_ALWAYS_INLINE void __builtin___clear_cache(char* begin, char* end) {
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if (folly::kIsArchAmd64) {
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// x86_64 doesn't require the instruction cache to be flushed after
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// modification.
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} else {
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// Default to flushing it for everything else, such as ARM.
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folly::portability::detail::call_flush_instruction_cache_self_pid(
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static_cast<void*>(begin), static_cast<size_t>(end - begin));
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}
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}
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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_ctz(unsigned int x) {
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unsigned long index;
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return int(_BitScanForward(&index, (unsigned long)x) ? index : 32);
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}
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FOLLY_ALWAYS_INLINE int __builtin_ctzl(unsigned long x) {
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return __builtin_ctz((unsigned int)x);
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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) {
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return __builtin_ffs(int(x));
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}
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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_popcount(unsigned int x) {
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return int(__popcnt(x));
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}
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FOLLY_ALWAYS_INLINE int __builtin_popcountl(unsigned long x) {
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static_assert(sizeof(x) == 4, "");
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return int(__popcnt(x));
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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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(void)frame;
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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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