diff options
Diffstat (limited to 'libc/sysdeps/x86_64/bits/byteswap.h')
| -rw-r--r-- | libc/sysdeps/x86_64/bits/byteswap.h | 126 |
1 files changed, 72 insertions, 54 deletions
diff --git a/libc/sysdeps/x86_64/bits/byteswap.h b/libc/sysdeps/x86_64/bits/byteswap.h index 5094a0540..417843933 100644 --- a/libc/sysdeps/x86_64/bits/byteswap.h +++ b/libc/sysdeps/x86_64/bits/byteswap.h @@ -1,6 +1,5 @@ /* Macros to swap the order of bytes in integer values. - Copyright (C) 1997, 1998, 2000, 2002, 2003, 2007, 2008, 2010, 2011 - Free Software Foundation, Inc. + 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 @@ -24,78 +23,75 @@ #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))) -#if defined __GNUC__ && __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 - +/* 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 || (defined __i486__ || defined __pentium__ \ - || defined __pentiumpro__ || defined __pentium4__ \ - || defined __k8__ || defined __athlon__ \ - || defined __k6__ || defined __nocona__ \ - || defined __core2__ || defined __geode__ \ - || defined __amdfam10__) +#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; })) +# 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) \ +# 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; })) + ({ register unsigned int __x = (x); __bswap_constant_32 (__x); })) # endif #else -# define __bswap_32(x) \ - (__extension__ \ - ({ register unsigned int __x = (x); __bswap_constant_32 (__x); })) +static __inline unsigned int +__bswap_32 (unsigned int __bsx) +{ + return __bswap_constant_32 (__bsx); +} #endif -#if defined __GNUC__ && __GNUC__ >= 2 +#if __GNUC_PREREQ (2, 0) /* Swap bytes in 64 bit value. */ # define __bswap_constant_64(x) \ (__extension__ ((((x) & 0xff00000000000000ull) >> 56) \ @@ -107,7 +103,13 @@ | (((x) & 0x000000000000ff00ull) << 40) \ | (((x) & 0x00000000000000ffull) << 56))) -# if __WORDSIZE == 64 +# 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); \ @@ -131,6 +133,22 @@ } \ __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 */ |