#include <stdio.h>
#include <mmintrin.h>

#define AS_BYTES "%2.2x %2.2x %2.2x %2.2x " \
                 "%2.2x %2.2x %2.2x %2.2x"

__m64   a;
__m64   b = { 0x8aacceef02244668 };
__m64   c = { 0x76543211fedcba98 };

void main()
  {
    a = _m_psubusb( b, c );
    printf( "m1="AS_BYTES"\n"
            "m2="AS_BYTES"\n"
            "mm="AS_BYTES"\n",
        b._8[7], b._8[6], b._8[5], b._8[4],
        b._8[3], b._8[2], b._8[1], b._8[0],
        c._8[7], c._8[6], c._8[5], c._8[4],
        c._8[3], c._8[2], c._8[1], c._8[0],
        a._8[7], a._8[6], a._8[5], a._8[4],
        a._8[3], a._8[2], a._8[1], a._8[0] );
  }