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99 lines
2.7 KiB
C
Vendored
99 lines
2.7 KiB
C
Vendored
/*
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* Copyright (c) 2023 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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#ifndef _OS__OSBYTEORDERARM_H
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#define _OS__OSBYTEORDERARM_H
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#if defined (__arm__) || defined(__arm64__)
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#include <sys/_types.h>
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#if !defined(__DARWIN_OS_INLINE)
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# if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
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# define __DARWIN_OS_INLINE static inline
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# elif defined(__MWERKS__) || defined(__cplusplus)
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# define __DARWIN_OS_INLINE static inline
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# else
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# define __DARWIN_OS_INLINE static __inline__
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# endif
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#endif
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/* Generic byte swapping functions. */
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__DARWIN_OS_INLINE
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__uint16_t
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_OSSwapInt16(
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__uint16_t _data
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)
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{
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/* Reduces to 'rev16' with clang */
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return (__uint16_t)(_data << 8 | _data >> 8);
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}
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__DARWIN_OS_INLINE
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__uint32_t
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_OSSwapInt32(
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__uint32_t _data
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)
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{
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#if defined(__llvm__)
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_data = __builtin_bswap32(_data);
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#else
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/* This actually generates the best code */
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_data = (((_data ^ (_data >> 16 | (_data << 16))) & 0xFF00FFFF) >> 8) ^ (_data >> 8 | _data << 24);
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#endif
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return _data;
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}
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__DARWIN_OS_INLINE
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__uint64_t
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_OSSwapInt64(
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__uint64_t _data
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)
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{
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#if defined(__llvm__)
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return __builtin_bswap64(_data);
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#else
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union {
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__uint64_t _ull;
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__uint32_t _ul[2];
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} _u;
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/* This actually generates the best code */
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_u._ul[0] = (__uint32_t)(_data >> 32);
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_u._ul[1] = (__uint32_t)(_data & 0xffffffff);
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_u._ul[0] = _OSSwapInt32(_u._ul[0]);
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_u._ul[1] = _OSSwapInt32(_u._ul[1]);
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return _u._ull;
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#endif
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}
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#endif /* defined (__arm__) || defined(__arm64__) */
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#endif /* ! _OS__OSBYTEORDERARM_H */
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