/* * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> * * This 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 of the License, or (at your option) any later version. * * This 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 this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file bswap.h * byte swap. */ #ifndef __BSWAP_H__ #define __BSWAP_H__ #ifdef HAVE_BYTESWAP_H #include <byteswap.h> #else #ifdef ARCH_X86_64 # define LEGACY_REGS "=Q" #else # define LEGACY_REGS "=q" #endif #if defined(ARCH_X86) || defined(ARCH_X86_64) static always_inline uint16_t bswap_16(uint16_t x) { __asm("rorw $8, %0" : LEGACY_REGS (x) : "0" (x)); return x; } static always_inline uint32_t bswap_32(uint32_t x) { #if __CPU__ != 386 __asm("bswap %0": "=r" (x) : #else __asm("xchgb %b0,%h0\n" " rorl $16,%0\n" " xchgb %b0,%h0": LEGACY_REGS (x) : #endif "0" (x)); return x; } static inline uint64_t bswap_64(uint64_t x) { #ifdef ARCH_X86_64 __asm("bswap %0": "=r" (x) : "0" (x)); return x; #else union { uint64_t ll; struct { uint32_t l,h; } l; } r; r.l.l = bswap_32 (x); r.l.h = bswap_32 (x>>32); return r.ll; #endif } #elif defined(ARCH_SH4) static always_inline uint16_t bswap_16(uint16_t x) { __asm__("swap.b %0,%0":"=r"(x):"0"(x)); return x; } static always_inline uint32_t bswap_32(uint32_t x) { __asm__( "swap.b %0,%0\n" "swap.w %0,%0\n" "swap.b %0,%0\n" :"=r"(x):"0"(x)); return x; } static inline uint64_t bswap_64(uint64_t x) { union { uint64_t ll; struct { uint32_t l,h; } l; } r; r.l.l = bswap_32 (x); r.l.h = bswap_32 (x>>32); return r.ll; } #else static always_inline uint16_t bswap_16(uint16_t x){ return (x>>8) | (x<<8); } #ifdef ARCH_ARM static always_inline uint32_t bswap_32(uint32_t x){ uint32_t t; __asm__ ( "eor %1, %0, %0, ror #16 \n\t" "bic %1, %1, #0xFF0000 \n\t" "mov %0, %0, ror #8 \n\t" "eor %0, %0, %1, lsr #8 \n\t" : "+r"(x), "+r"(t)); return x; } #else static always_inline uint32_t bswap_32(uint32_t x){ x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF); return (x>>16) | (x<<16); } #endif static inline uint64_t bswap_64(uint64_t x) { #if 0 x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL); x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL); return (x>>32) | (x<<32); #else union { uint64_t ll; uint32_t l[2]; } w, r; w.ll = x; r.l[0] = bswap_32 (w.l[1]); r.l[1] = bswap_32 (w.l[0]); return r.ll; #endif } #endif /* !ARCH_X86 */ #endif /* !HAVE_BYTESWAP_H */ // be2me ... BigEndian to MachineEndian // le2me ... LittleEndian to MachineEndian #ifdef WORDS_BIGENDIAN #define be2me_16(x) (x) #define be2me_32(x) (x) #define be2me_64(x) (x) #define le2me_16(x) bswap_16(x) #define le2me_32(x) bswap_32(x) #define le2me_64(x) bswap_64(x) #else #define be2me_16(x) bswap_16(x) #define be2me_32(x) bswap_32(x) #define be2me_64(x) bswap_64(x) #define le2me_16(x) (x) #define le2me_32(x) (x) #define le2me_64(x) (x) #endif #endif /* __BSWAP_H__ */