mirror of
https://sourceware.org/git/glibc.git
synced 2025-11-03 20:53:13 +03:00
89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
/* Macros to swap the order of bytes in integer values. m68k version.
|
|
Copyright (C) 1997-2017 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library. If not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#if !defined _BYTESWAP_H && !defined _NETINET_IN_H && !defined _ENDIAN_H
|
|
# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
|
|
#endif
|
|
|
|
#ifndef _BITS_BYTESWAP_H
|
|
#define _BITS_BYTESWAP_H 1
|
|
|
|
/* Swap bytes in 16 bit value. We don't provide an assembler version
|
|
because GCC is smart enough to generate optimal assembler output, and
|
|
this allows for better cse. */
|
|
#define __bswap_constant_16(x) \
|
|
((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))
|
|
|
|
static __always_inline unsigned short int
|
|
__bswap_16 (unsigned short int __bsx)
|
|
{
|
|
return __bswap_constant_16 (__bsx);
|
|
}
|
|
|
|
/* Swap bytes in 32 bit value. */
|
|
#define __bswap_constant_32(x) \
|
|
((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \
|
|
(((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24))
|
|
|
|
#if !defined(__mcoldfire__)
|
|
static __always_inline unsigned int
|
|
__bswap_32 (unsigned int __bsx)
|
|
{
|
|
if (__builtin_constant_p (__bsx))
|
|
return __bswap_constant_32 (__bsx);
|
|
__asm__ __volatile__ ("ror%.w %#8, %0;"
|
|
"swap %0;"
|
|
"ror%.w %#8, %0"
|
|
: "+d" (__bsx));
|
|
return __bsx;
|
|
}
|
|
#else
|
|
static __always_inline unsigned int
|
|
__bswap_32 (unsigned int __bsx)
|
|
{
|
|
return __bswap_constant_32 (__bsx);
|
|
}
|
|
#endif
|
|
|
|
#if defined __GNUC__ && __GNUC__ >= 2
|
|
/* Swap bytes in 64 bit value. */
|
|
# define __bswap_constant_64(x) \
|
|
__extension__ \
|
|
((((x) & 0xff00000000000000ull) >> 56) \
|
|
| (((x) & 0x00ff000000000000ull) >> 40) \
|
|
| (((x) & 0x0000ff0000000000ull) >> 24) \
|
|
| (((x) & 0x000000ff00000000ull) >> 8) \
|
|
| (((x) & 0x00000000ff000000ull) << 8) \
|
|
| (((x) & 0x0000000000ff0000ull) << 24) \
|
|
| (((x) & 0x000000000000ff00ull) << 40) \
|
|
| (((x) & 0x00000000000000ffull) << 56))
|
|
|
|
/* Swap bytes in 64 bit value. */
|
|
__extension__
|
|
static __always_inline unsigned long long
|
|
__bswap_64 (unsigned long long __bsx)
|
|
{
|
|
if (__builtin_constant_p (__bsx))
|
|
return __bswap_constant_64 (__bsx);
|
|
return (__bswap_32 (__bsx >> 32)
|
|
| ((unsigned long long) __bswap_32 (__bsx) << 32));
|
|
}
|
|
#endif
|
|
|
|
#endif /* _BITS_BYTESWAP_H */
|