diff options
Diffstat (limited to 'sysdeps/s390/bits/byteswap-16.h')
| -rw-r--r-- | sysdeps/s390/bits/byteswap-16.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/sysdeps/s390/bits/byteswap-16.h b/sysdeps/s390/bits/byteswap-16.h new file mode 100644 index 0000000000..8bfec78ffe --- /dev/null +++ b/sysdeps/s390/bits/byteswap-16.h @@ -0,0 +1,65 @@ +/* Macros to swap the order of bytes in 16-bit integer values. s390 version + Copyright (C) 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/>. */ + +#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 = (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 = (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 |