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/* Macros to swap the order of bytes in integer values. s390 version.
Copyright (C) 2000-2012 Free Software Foundation, Inc.
Contributed by Martin Schwidefsky (schwidefsky@de.ibm.com).
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
#include <bits/wordsize.h>
#ifndef _BITS_BYTESWAP_H
#define _BITS_BYTESWAP_H 1
#define __bswap_constant_16(x) \
((unsigned short int) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)))
/* Get __bswap_16. */
#include <bits/byteswap-16.h>
/* Swap bytes in 32 bit value. */
#define __bswap_constant_32(x) \
((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >> 8) | \
(((x) & 0x0000ff00) << 8) | (((x) & 0x000000ff) << 24))
#if defined __GNUC__ && __GNUC__ >= 2
# if __WORDSIZE == 64
# define __bswap_32(x) \
(__extension__ \
({ unsigned int __v, __x = (x); \
if (__builtin_constant_p (x)) \
__v = __bswap_constant_32 (__x); \
else { \
unsigned int __tmp = (unsigned int) (__x); \
__asm__ __volatile__ ( \
"lrv %0,%1" \
: "=&d" (__v) : "m" (__tmp)); \
} \
__v; }))
# else
# define __bswap_32(x) \
(__extension__ \
({ unsigned int __v, __x = (x); \
if (__builtin_constant_p (x)) \
__v = __bswap_constant_32 (__x); \
else { \
unsigned int __tmp = (unsigned int) (__x); \
__asm__ __volatile__ ( \
"la 1,%1\n" \
"icm %0,8,3(1)\n" \
"icm %0,4,2(1)\n" \
"icm %0,2,1(1)\n" \
"ic %0,0(1)" \
: "=&d" (__v) : "m" (__tmp) : "1"); \
} \
__v; }))
# endif
#else
static __inline unsigned int
__bswap_32 (unsigned int __bsx)
{
return __bswap_constant_32 (__bsx);
}
#endif
/* Swap bytes in 64 bit value. */
#if defined __GNUC__ && __GNUC__ >= 2
# define __bswap_constant_64(x) \
(__extension__ ((((x) & 0xff00000000000000ul) >> 56) \
| (((x) & 0x00ff000000000000ul) >> 40) \
| (((x) & 0x0000ff0000000000ul) >> 24) \
| (((x) & 0x000000ff00000000ul) >> 8) \
| (((x) & 0x00000000ff000000ul) << 8) \
| (((x) & 0x0000000000ff0000ul) << 24) \
| (((x) & 0x000000000000ff00ul) << 40) \
| (((x) & 0x00000000000000fful) << 56)))
# if __WORDSIZE == 64
# define __bswap_64(x) \
(__extension__ \
({ unsigned long __w, __x = (x); \
if (__builtin_constant_p (x)) \
__w = __bswap_constant_64 (__x); \
else { \
unsigned long __tmp = (unsigned long) (__x); \
__asm__ __volatile__ ( \
"lrvg %0,%1" \
: "=&d" (__w) : "m" (__tmp)); \
} \
__w; }))
# else
# define __bswap_64(x) \
__extension__ \
({ union { unsigned long long int __ll; \
unsigned long int __l[2]; } __w, __r; \
__w.__ll = (x); \
__r.__l[0] = __bswap_32 (__w.__l[1]); \
__r.__l[1] = __bswap_32 (__w.__l[0]); \
__r.__ll; })
# endif
#elif __GLIBC_HAVE_LONG_LONG
# define __bswap_constant_64(x) \
((((x) & 0xff00000000000000ull) >> 56) \
| (((x) & 0x00ff000000000000ull) >> 40) \
| (((x) & 0x0000ff0000000000ull) >> 24) \
| (((x) & 0x000000ff00000000ull) >> 8) \
| (((x) & 0x00000000ff000000ull) << 8) \
| (((x) & 0x0000000000ff0000ull) << 24) \
| (((x) & 0x000000000000ff00ull) << 40) \
| (((x) & 0x00000000000000ffull) << 56))
static __inline unsigned long long int
__bswap_64 (unsigned long long int __bsx)
{
return __bswap_constant_64 (__bsx);
}
#endif
#endif /* _BITS_BYTESWAP_H */
|
