gcc_byte_swaps.h

#ifndef GCC_BYTE_SWAPS_H
#define GCC_BYTE_SWAPS_H
 
#if defined(__i386__)
 
#if defined(HAVE_STDINT_H)
#include <stdint.h>
#endif
 
inline uint32_t
ArchSwap32(uint32_t n)
{
    asm("xchg %b0, %h0\n"
        "rorl $16, %0\n"
        "xchg %b0, %h0"
        : "=q"(n)
        : "0"(n));
    return n;
}
 
inline uint32_t
ArchSwap24(uint32_t n)
{
    asm("xchg %b0, %h0\n"
        "rorl $16, %0\n"
        "xchg %b0, %h0\n"
        "shrl $8, %0\n"
        : "=q"(n)
        : "0"(n));
    return n;
}
 
inline uint16_t
ArchSwap16(uint16_t n)
{
    asm("xchg %b0, %h0\n" : "=q"(n) : "0"(n));
    return n;
}
 
#define HAVE_BYTE_SWAPS
#endif
 
#endif