mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-24 11:41:07 +00:00
66 lines
2.7 KiB
C
66 lines
2.7 KiB
C
/* Macros to swap the order of bytes in 16-bit integer values. s390 version
|
|
Copyright (C) 2012-2013 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/>. */
|
|
|
|
#ifndef _BITS_BYTESWAP_H
|
|
# error "Never use <bits/byteswap-16.h> directly; include <byteswap.h> instead."
|
|
#endif
|
|
|
|
#include <bits/wordsize.h>
|
|
|
|
/* Swap bytes in 16 bit value. */
|
|
#if defined __GNUC__ && __GNUC__ >= 2
|
|
# if __WORDSIZE == 64
|
|
# define __bswap_16(x) \
|
|
(__extension__ \
|
|
({ unsigned short int __v, __x = (unsigned short int) (x); \
|
|
if (__builtin_constant_p (x)) \
|
|
__v = __bswap_constant_16 (__x); \
|
|
else { \
|
|
unsigned short int __tmp = (unsigned short int) (__x); \
|
|
__asm__ __volatile__ ( \
|
|
"lrvh %0,%1" \
|
|
: "=&d" (__v) : "m" (__tmp) ); \
|
|
} \
|
|
__v; }))
|
|
# else
|
|
# define __bswap_16(x) \
|
|
(__extension__ \
|
|
({ unsigned short int __v, __x = (unsigned short int) (x); \
|
|
if (__builtin_constant_p (x)) \
|
|
__v = __bswap_constant_16 (__x); \
|
|
else { \
|
|
unsigned short int __tmp = (unsigned short int) (__x); \
|
|
__asm__ __volatile__ ( \
|
|
"sr %0,%0\n" \
|
|
"la 1,%1\n" \
|
|
"icm %0,2,1(1)\n" \
|
|
"ic %0,0(1)" \
|
|
: "=&d" (__v) : "m" (__tmp) : "1"); \
|
|
} \
|
|
__v; }))
|
|
# endif
|
|
#else
|
|
/* This is better than nothing. */
|
|
static __inline unsigned short int
|
|
__bswap_16 (unsigned short int __bsx)
|
|
{
|
|
return __bswap_constant_16 (__bsx);
|
|
}
|
|
#endif
|