diff options
Diffstat (limited to 'sysdeps/x86')
| -rw-r--r-- | sysdeps/x86/bits/byteswap-16.h | 49 | ||||
| -rw-r--r-- | sysdeps/x86/bits/byteswap.h | 154 |
2 files changed, 203 insertions, 0 deletions
diff --git a/sysdeps/x86/bits/byteswap-16.h b/sysdeps/x86/bits/byteswap-16.h new file mode 100644 index 0000000000..584eb86b74 --- /dev/null +++ b/sysdeps/x86/bits/byteswap-16.h @@ -0,0 +1,49 @@ +/* Macros to swap the order of bytes in 16-bit integer values. + Copyright (C) 2012 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 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 + +#ifdef __GNUC__ +# if __GNUC__ >= 2 +# define __bswap_16(x) \ + (__extension__ \ + ({ register unsigned short int __v, __x = (unsigned short int) (x); \ + if (__builtin_constant_p (__x)) \ + __v = __bswap_constant_16 (__x); \ + else \ + __asm__ ("rorw $8, %w0" \ + : "=r" (__v) \ + : "0" (__x) \ + : "cc"); \ + __v; })) +# else +/* This is better than nothing. */ +# define __bswap_16(x) \ + (__extension__ \ + ({ register unsigned short int __x = (unsigned short int) (x); \ + __bswap_constant_16 (__x); })) +# endif +#else +static __inline unsigned short int +__bswap_16 (unsigned short int __bsx) +{ + return __bswap_constant_16 (__bsx); +} +#endif diff --git a/sysdeps/x86/bits/byteswap.h b/sysdeps/x86/bits/byteswap.h new file mode 100644 index 0000000000..4178439334 --- /dev/null +++ b/sysdeps/x86/bits/byteswap.h @@ -0,0 +1,154 @@ +/* Macros to swap the order of bytes in integer values. + Copyright (C) 1997-2012 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 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 + +#ifndef _BITS_BYTESWAP_H +#define _BITS_BYTESWAP_H 1 + +#include <features.h> +#include <bits/wordsize.h> + +/* Swap bytes in 16 bit value. */ +#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)) + +#ifdef __GNUC__ +# if __GNUC_PREREQ (4, 2) +static __inline unsigned int +__bswap_32 (unsigned int __bsx) +{ + return __builtin_bswap32 (__bsx); +} +# elif __GNUC__ >= 2 +# if __WORDSIZE == 64 || (defined __i486__ || defined __pentium__ \ + || defined __pentiumpro__ || defined __pentium4__ \ + || defined __k8__ || defined __athlon__ \ + || defined __k6__ || defined __nocona__ \ + || defined __core2__ || defined __geode__ \ + || defined __amdfam10__) +/* 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, __x = (x); \ + if (__builtin_constant_p (__x)) \ + __v = __bswap_constant_32 (__x); \ + else \ + __asm__ ("bswap %0" : "=r" (__v) : "0" (__x)); \ + __v; })) +# else +# define __bswap_32(x) \ + (__extension__ \ + ({ register unsigned int __v, __x = (x); \ + if (__builtin_constant_p (__x)) \ + __v = __bswap_constant_32 (__x); \ + else \ + __asm__ ("rorw $8, %w0;" \ + "rorl $16, %0;" \ + "rorw $8, %w0" \ + : "=r" (__v) \ + : "0" (__x) \ + : "cc"); \ + __v; })) +# endif +# else +# define __bswap_32(x) \ + (__extension__ \ + ({ register unsigned int __x = (x); __bswap_constant_32 (__x); })) +# endif +#else +static __inline unsigned int +__bswap_32 (unsigned int __bsx) +{ + return __bswap_constant_32 (__bsx); +} +#endif + + +#if __GNUC_PREREQ (2, 0) +/* Swap bytes in 64 bit value. */ +# define __bswap_constant_64(x) \ + (__extension__ ((((x) & 0xff00000000000000ull) >> 56) \ + | (((x) & 0x00ff000000000000ull) >> 40) \ + | (((x) & 0x0000ff0000000000ull) >> 24) \ + | (((x) & 0x000000ff00000000ull) >> 8) \ + | (((x) & 0x00000000ff000000ull) << 8) \ + | (((x) & 0x0000000000ff0000ull) << 24) \ + | (((x) & 0x000000000000ff00ull) << 40) \ + | (((x) & 0x00000000000000ffull) << 56))) + +# if __GNUC_PREREQ (4, 2) +static __inline unsigned long long int +__bswap_64 (unsigned long long int __bsx) +{ + return __builtin_bswap64 (__bsx); +} +# elif __WORDSIZE == 64 +# define __bswap_64(x) \ + (__extension__ \ + ({ register unsigned long __v, __x = (x); \ + if (__builtin_constant_p (__x)) \ + __v = __bswap_constant_64 (__x); \ + else \ + __asm__ ("bswap %q0" : "=r" (__v) : "0" (__x)); \ + __v; })) +# else +# define __bswap_64(x) \ + (__extension__ \ + ({ union { __extension__ unsigned long long int __ll; \ + unsigned int __l[2]; } __w, __r; \ + if (__builtin_constant_p (x)) \ + __r.__ll = __bswap_constant_64 (x); \ + else \ + { \ + __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 */ |