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clib/libmpeg2/motion_comp_mmx.c  view on Meta::CPAN

 * (x+y+1)>>1 == (x|y)-((x^y)>>1)
 */

/* some rounding constants */
static mmx_t mask1 = {0xfefefefefefefefeLL};
static mmx_t round4 = {0x0002000200020002LL};

/*
 * This code should probably be compiled with loop unrolling
 * (ie, -funroll-loops in gcc)becuase some of the loops
 * use a small static number of iterations. This was written
 * with the assumption the compiler knows best about when
 * unrolling will help
 */

static inline void mmx_zero_reg (void)
{
    /* load 0 into mm0 */
    pxor_r2r (mm0, mm0);
}