/* * libc/sysdeps/linux/v850/bits/byteswap.h -- Macros to swap the order * of bytes in integer values * * Copyright (C) 2001 NEC Corporation * Copyright (C) 2001 Miles Bader <miles@gnu.org> * Copyright (C) 1997,1998,2001 Free Software Foundation, Inc. * * This file is subject to the terms and conditions of the GNU Lesser * General Public License. See the file COPYING.LIB in the main * directory of this archive for more details. */ #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)) #ifdef __GNUC__ # define __bswap_16(x) \ (__extension__ \ ({ unsigned long int __bswap_16_v; \ if (__builtin_constant_p (x)) \ __bswap_16_v = __bswap_constant_16 (x); \ else \ __asm__ ("bsh %1, %0" : "=r" (__bswap_16_v) : "r" (x)); \ __bswap_16_v; })) #else # 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)) #ifdef __GNUC__ # define __bswap_32(x) \ (__extension__ \ ({ unsigned long int __bswap_32_v; \ if (__builtin_constant_p (x)) \ __bswap_32_v = __bswap_constant_32 (x); \ else \ __asm__ ("bsw %1, %0" : "=r" (__bswap_32_v) : "r" (x)); \ __bswap_32_v; })) #else # define __bswap_32(x) __bswap_constant_32 (x) #endif #if defined __GNUC__ && __GNUC__ >= 2 /* Swap bytes in 64 bit value. */ # define __bswap_64(x) \ (__extension__ \ ({ union { unsigned long long int __ll; \ unsigned long int __l[2]; } __bswap_64_v, __bswap_64_r; \ __bswap_64_v.__ll = (x); \ __bswap_64_r.__l[0] = __bswap_32 (__bswap_64_v.__l[1]); \ __bswap_64_r.__l[1] = __bswap_32 (__bswap_64_v.__l[0]); \ __bswap_64_r.__ll; })) #endif