func: static inline void hScale_altivec_real(int16_t *dst, int dstW, uint8_t *src, int srcW, int xInc, int16_t *filter, int16_t *filterPos, int filterSize) {
  
    register int i;
  
    int __attribute__ ((aligned (16))) tempo[4];
  
  
  
    if (filterSize % 4) {
  
      for(i=0; i<dstW; i++) {
  
        register int j;
  
        register int srcPos = filterPos[i];
  
        register int val = 0;
  
        for(j=0; j<filterSize; j++) {
  
  	val += ((int)src[srcPos + j])*filter[filterSize*i + j];
  
        }
  
        dst[i] = av_clip(val>>7, 0, (1<<15)-1);
  
      }
  
    }
  
    else
  
    switch (filterSize) {
  
    case 4:
  
      {
  
        for(i=0; i<dstW; i++) {
  
  	register int srcPos = filterPos[i];
  
  
  
  	vector unsigned char src_v0 = vec_ld(srcPos, src);
  
  	vector unsigned char src_v1, src_vF;
  
  	vector signed short src_v, filter_v;
  
  	vector signed int val_vEven, val_s;
  
  	if ((((int)src + srcPos)% 16) > 12) {
  
  	  src_v1 = vec_ld(srcPos + 16, src);
  
  	}
  
  	src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
  
  
  
  	src_v = // vec_unpackh sign-extends...
  
  	  (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
  
  	// now put our elements in the even slots
  
  	src_v = vec_mergeh(src_v, (vector signed short)vzero);
  
  
  
  	filter_v = vec_ld(i << 3, filter);
  
          // the 3 above is 2 (filterSize == 4) + 1 (sizeof(short) == 2)
  
  
  
          // the neat trick : we only care for half the elements,
  
          // high or low depending on (i<<3)%16 (it's 0 or 8 here),
  
          // and we're going to use vec_mule, so we chose
  
          // carefully how to "unpack" the elements into the even slots
  
  	if ((i << 3) % 16)
  
  	  filter_v = vec_mergel(filter_v,(vector signed short)vzero);
  
  	else
  
  	  filter_v = vec_mergeh(filter_v,(vector signed short)vzero);
  
  
  
  	val_vEven = vec_mule(src_v, filter_v);
  
  	val_s = vec_sums(val_vEven, vzero);
  
  	vec_st(val_s, 0, tempo);
  
  	dst[i] = av_clip(tempo[3]>>7, 0, (1<<15)-1);
  
        }
  
      }
  
      break;
  
  
  
    case 8:
  
      {
  
        for(i=0; i<dstW; i++) {
  
  	register int srcPos = filterPos[i];
  
  
  
  	vector unsigned char src_v0 = vec_ld(srcPos, src);
  
  	vector unsigned char src_v1, src_vF;
  
  	vector signed short src_v, filter_v;
  
  	vector signed int val_v, val_s;
  
  	if ((((int)src + srcPos)% 16) > 8) {
  
  	  src_v1 = vec_ld(srcPos + 16, src);
  
  	}
  
  	src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
  
  
  
  	src_v = // vec_unpackh sign-extends...
  
  	  (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
  
  	filter_v = vec_ld(i << 4, filter);
  
          // the 4 above is 3 (filterSize == 8) + 1 (sizeof(short) == 2)
  
  
  
  	val_v = vec_msums(src_v, filter_v, (vector signed int)vzero);
  
  	val_s = vec_sums(val_v, vzero);
  
  	vec_st(val_s, 0, tempo);
  
  	dst[i] = av_clip(tempo[3]>>7, 0, (1<<15)-1);
  
        }
  
      }
  
      break;
  
  
  
    case 16:
  
      {
  
        for(i=0; i<dstW; i++) {
  
  	register int srcPos = filterPos[i];
  
  
  
  	vector unsigned char src_v0 = vec_ld(srcPos, src);
  
  	vector unsigned char src_v1 = vec_ld(srcPos + 16, src);
  
  	vector unsigned char src_vF = vec_perm(src_v0, src_v1, vec_lvsl(srcPos, src));
  
  
  
  	vector signed short src_vA = // vec_unpackh sign-extends...
  
  	  (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
  
  	vector signed short src_vB = // vec_unpackh sign-extends...
  
  	  (vector signed short)(vec_mergel((vector unsigned char)vzero, src_vF));
  
  
  
  	vector signed short filter_v0 = vec_ld(i << 5, filter);
  
         	vector signed short filter_v1 = vec_ld((i << 5) + 16, filter);
  
          // the 5 above are 4 (filterSize == 16) + 1 (sizeof(short) == 2)
  
  
  
  	vector signed int val_acc = vec_msums(src_vA, filter_v0, (vector signed int)vzero);
  
  	vector signed int val_v = vec_msums(src_vB, filter_v1, val_acc);
  
  
  
  	vector signed int val_s = vec_sums(val_v, vzero);
  
  
  
  	vec_st(val_s, 0, tempo);
  
  	dst[i] = av_clip(tempo[3]>>7, 0, (1<<15)-1);
  
        }
  
      }
  
      break;
  
  
  
    default:
  
      {
  
        for(i=0; i<dstW; i++) {
  
  	register int j;
  
  	register int srcPos = filterPos[i];
  
  
  
          vector signed int val_s, val_v = (vector signed int)vzero;
  
  	vector signed short filter_v0R = vec_ld(i * 2 * filterSize, filter);
  
          vector unsigned char permF = vec_lvsl((i * 2 * filterSize), filter);
  
  
  
          vector unsigned char src_v0 = vec_ld(srcPos, src);
  
          vector unsigned char permS = vec_lvsl(srcPos, src);
  
  
  
          for (j = 0 ; j < filterSize - 15; j += 16) {
  
            vector unsigned char src_v1 = vec_ld(srcPos + j + 16, src);
  
            vector unsigned char src_vF = vec_perm(src_v0, src_v1, permS);
  
  
  
            vector signed short src_vA = // vec_unpackh sign-extends...
  
              (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
  
            vector signed short src_vB = // vec_unpackh sign-extends...
  
              (vector signed short)(vec_mergel((vector unsigned char)vzero, src_vF));
  
  
  
            vector signed short filter_v1R = vec_ld((i * 2 * filterSize) + (j * 2) + 16, filter);
  
            vector signed short filter_v2R = vec_ld((i * 2 * filterSize) + (j * 2) + 32, filter);
  
            vector signed short filter_v0 = vec_perm(filter_v0R, filter_v1R, permF);
  
            vector signed short filter_v1 = vec_perm(filter_v1R, filter_v2R, permF);
  
  
  
            vector signed int val_acc = vec_msums(src_vA, filter_v0, val_v);
  
            val_v = vec_msums(src_vB, filter_v1, val_acc);
  
  
  
            filter_v0R = filter_v2R;
  
            src_v0 = src_v1;
  
          }
  
  
  
          if (j < (filterSize-7)) {
  
            // loading src_v0 is useless, it's already done above
  
            //vector unsigned char src_v0 = vec_ld(srcPos + j, src);
  
            vector unsigned char src_v1, src_vF;
  
            vector signed short src_v, filter_v1R, filter_v;
  
            if ((((int)src + srcPos)% 16) > 8) {
  
              src_v1 = vec_ld(srcPos + j + 16, src);
  
            }
  
            src_vF = vec_perm(src_v0, src_v1, permS);
  
  
  
            src_v = // vec_unpackh sign-extends...
  
              (vector signed short)(vec_mergeh((vector unsigned char)vzero, src_vF));
  
            // loading filter_v0R is useless, it's already done above
  
            //vector signed short filter_v0R = vec_ld((i * 2 * filterSize) + j, filter);
  
            filter_v1R = vec_ld((i * 2 * filterSize) + (j * 2) + 16, filter);
  
            filter_v = vec_perm(filter_v0R, filter_v1R, permF);
  
  
  
            val_v = vec_msums(src_v, filter_v, val_v);
  
          }
  
  
  
          val_s = vec_sums(val_v, vzero);
  
  
  
          vec_st(val_s, 0, tempo);
  
          dst[i] = av_clip(tempo[3]>>7, 0, (1<<15)-1);
  
        }
  
  
  
      }
  
    }
  
  }
  