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