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

#define AS_DWORDS "%8.8lx %8.8lx"

__m64   a;
__m64   b = { 0x0004000300020001 };
__m64   c = { 0xff7fff800080007f };

void main()
  {
    a = _m_punpckhdq( b, c );
    printf( "m2="AS_DWORDS" "
            "m1="AS_DWORDS"\n"
            "mm="AS_DWORDS"\n",
        c._32[1], c._32[0],
        b._32[1], b._32[0],
        a._32[1], a._32[0] );
  }