uint32_t
sad8_altivec_c(const uint8_t * cur,
const uint8_t *ref,
const uint32_t stride)
{
uint32_t result = 0;
register vector unsigned int sad;
register vector unsigned char c;
register vector unsigned char r;
/* initialize */
sad = vec_splat_u32(0);
/* Perform sad operations */
SAD8();
SAD8();
SAD8();
SAD8();
SAD8();
SAD8();
SAD8();
SAD8();
/* finish addition, add the first 2 together */
sad = vec_and(sad, (vector unsigned int)vec_pack(vec_splat_u16(-1),vec_splat_u16(0)));
sad = (vector unsigned int)vec_sums((vector signed int)sad, vec_splat_s32(0));
sad = vec_splat(sad,3);
vec_ste(sad, 0, &result);
return result;
}
/*
* This function assumes cur is 8 bytes aligned, stride is 16 bytes
* aligned and ref is unaligned
*/
unsigned long
sad8_altivec(const vector unsigned char *cur,
const vector unsigned char *ref,
unsigned long stride)
{
vector unsigned char t1, t2, t3, t4, t5, tp;
vector unsigned int sad;
vector signed int sumdiffs;
vector unsigned char perm_cur;
vector unsigned char perm_ref1, perm_ref2;
unsigned long result;
ZERODEF;
#ifdef DEBUG
if (((unsigned long) cur) & 0x7)
fprintf(stderr, "sad8_altivec:incorrect align, cur: %x\n", cur);
// if (((unsigned long)ref) & 0x7)
// fprintf(stderr, "sad8_altivec:incorrect align, ref: %x\n", ref);
if (stride & 0xf)
fprintf(stderr, "sad8_altivec:incorrect align, stride: %x\n", stride);
#endif
perm_cur = get_perm((((unsigned long) cur) >> 3) & 0x01);
perm_ref1 = vec_lvsl(0, (unsigned char *) ref);
perm_ref2 = get_perm(0);
/* initialization */
sad = (vector unsigned int) (ZEROVEC);
stride >>= 4;
/* perform sum of differences between current and previous */
SAD8();
SAD8();
SAD8();
SAD8();
/* sum all parts of difference into one 32 bit quantity */
sumdiffs = vec_sums((vector signed int) sad, (vector signed int) ZEROVEC);
/* copy vector sum into unaligned result */
sumdiffs = vec_splat(sumdiffs, 3);
vec_ste(sumdiffs, 0, (int *) &result);
return (result);
}
