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Diffstat (limited to 'sysdeps/ia64/bits/byteswap.h')
| -rw-r--r-- | sysdeps/ia64/bits/byteswap.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/sysdeps/ia64/bits/byteswap.h b/sysdeps/ia64/bits/byteswap.h new file mode 100644 index 0000000000..afcb1747e3 --- /dev/null +++ b/sysdeps/ia64/bits/byteswap.h @@ -0,0 +1,95 @@ +/* Macros to swap the order of bytes in integer values. + Copyright (C) 1997, 1998, 2000 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#if !defined _BYTESWAP_H && !defined _NETINET_IN_H +# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead." +#endif + +/* Swap bytes in 16 bit value. */ +#define __bswap_constant_16(x) \ + ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)) + +#if defined __GNUC__ && __GNUC__ >= 2 +# define __bswap_16(x) \ + (__extension__ \ + ({ register unsigned short int __v; \ + if (__builtin_constant_p (x)) \ + __v = __bswap_constant_16 (x); \ + else \ + __asm__ __volatile__ ("shl %0 = %1, 48 ;;" \ + "mux1 %0 = %2, @rev ;;" \ + : "=r" (__v) \ + : "r" ((unsigned short int) (x)), "0" (__v));\ + __v; })) +#else +/* This is better than nothing. */ +# define __bswap_16(x) __bswap_constant_16 (x) +#endif + + +/* 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 +/* To swap the bytes in a word the i486 processors and up provide the + `bswap' opcode. On i386 we have to use three instructions. */ +# define __bswap_32(x) \ + (__extension__ \ + ({ register unsigned int __v; \ + if (__builtin_constant_p (x)) \ + __v = __bswap_constant_32 (x); \ + else \ + __asm__ __volatile__ ("shl %0 = %1, 32 ;;" \ + "mux1 %0 = %2, @rev ;;" \ + : "=r" (__v) \ + : "r" ((unsigned int) (x)), "0" (__v)); \ + __v; })) +#else +# define __bswap_32(x) __bswap_constant_32 (x) +#endif + + +/* Swap bytes in 64 bit value. */ +#define __bswap_constant_64(x) \ + ((((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 defined __GNUC__ && __GNUC__ >= 2 +# define __bswap_64(x) \ + (__extension__ \ + ({ register unsigned long int __v; \ + if (__builtin_constant_p (x)) \ + __v = __bswap_constant_64 (x); \ + else \ + __asm__ __volatile__ ("mux1 %0 = %1, @rev ;;" \ + : "=r" (__v) \ + : "r" ((unsigned long int) (x))); \ + __v; })) + +#else +# define __bswap_64(x) __bswap_constant_64 (x) +#endif |