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glibc/sysdeps/s390/bits/byteswap.h
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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 */ |