uvg266/src/strategies/avx2/sao-avx2.c

/*****************************************************************************
 * This file is part of Kvazaar HEVC encoder.
 *
 * Copyright (C) 2013-2015 Tampere University of Technology and others (see
 * COPYING file).
 *
 * Kvazaar is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the
 * Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 *
 * Kvazaar is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with Kvazaar.  If not, see <http://www.gnu.org/licenses/>.
 ****************************************************************************/

#include "strategies/avx2/sao-avx2.h"

#if COMPILE_INTEL_AVX2
#include <immintrin.h>
#include <nmmintrin.h>

#include "cu.h"
#include "encoder.h"
#include "encoderstate.h"
#include "kvazaar.h"
#include "sao.h"
#include "strategyselector.h"


// These optimizations are based heavily on sao-generic.c.
// Might be useful to check that if (when) this file
// is difficult to understand.

static INLINE __m128i load_6_pixels(const kvz_pixel* data)
{
  return _mm_insert_epi16(_mm_cvtsi32_si128(*(int32_t*)&(data[0])), *(int16_t*)&(data[4]), 2);
}


// Mapping of edge_idx values to eo-classes.
static int sao_calc_eo_cat(kvz_pixel a, kvz_pixel b, kvz_pixel c)
{
  // Mapping relationships between a, b and c to eo_idx.
  static const int sao_eo_idx_to_eo_category[] = { 1, 2, 0, 3, 4 };

  int eo_idx = 2 + SIGN3((int)c - (int)a) + SIGN3((int)c - (int)b);

  //printf("%d ", SIGN3((int)c - (int)a));
  return sao_eo_idx_to_eo_category[eo_idx];
}


// Mapping of edge_idx values to eo-classes.
static __m256i sao_calc_eo_cat_avx2(__m128i* vector_a_epi8, __m128i* vector_b_epi8, __m128i* vector_c_epi8)
{
  // Mapping relationships between a, b and c to eo_idx.
  __m256i vector_sao_eo_idx_to_eo_category_epi32 = _mm256_setr_epi32(1, 2, 0, 3, 4, 0, 0, 0);

  __m256i eo_idx_epi32 = _mm256_set1_epi32(2);
  __m256i vector_a_epi32 = _mm256_cvtepu8_epi32(*vector_a_epi8);
  __m256i vector_b_epi32 = _mm256_cvtepu8_epi32(*vector_b_epi8);
  __m256i vector_c_epi32 = _mm256_cvtepu8_epi32(*vector_c_epi8);

  __m256i temp1_epi32 = _mm256_sign_epi32(_mm256_set1_epi32(1), _mm256_sub_epi32(vector_c_epi32, vector_a_epi32));
  __m256i temp2_epi32 = _mm256_sign_epi32(_mm256_set1_epi32(1), _mm256_sub_epi32(vector_c_epi32, vector_b_epi32));


  eo_idx_epi32 = _mm256_add_epi32(eo_idx_epi32, temp1_epi32);
  eo_idx_epi32 = _mm256_add_epi32(eo_idx_epi32, temp2_epi32);

  __m256i v_cat_epi32 = _mm256_permutevar8x32_epi32(vector_sao_eo_idx_to_eo_category_epi32, eo_idx_epi32);
  return v_cat_epi32;
}

static int sao_edge_ddistortion_avx2(const kvz_pixel *orig_data,
 const kvz_pixel *rec_data,
 int block_width,
 int block_height,
 int eo_class,
 int offsets[NUM_SAO_EDGE_CATEGORIES])
{
  int y, x;
  vector2d_t a_ofs = g_sao_edge_offsets[eo_class][0];
  vector2d_t b_ofs = g_sao_edge_offsets[eo_class][1];

  __m256i offsets_epi32 = _mm256_inserti128_si256(_mm256_castsi128_si256(_mm_loadu_si128((__m128i*) offsets)), _mm_insert_epi32(_mm_setzero_si128(), offsets[4], 0), 1);
  __m256i tmp_diff_epi32;
  __m256i tmp_sum_epi32 = _mm256_setzero_si256();
  __m256i tmp_offset_epi32;
  __m256i tmp1_vec_epi32;
  __m256i tmp2_vec_epi32;

  int sum = 0;
  for (y = 1; y < block_height - 1; ++y) {
    for (x = 1; x < block_width - 8; x+=8) {
      const kvz_pixel *c_data = &rec_data[y * block_width + x];

      __m128i vector_a_epi8 = _mm_loadl_epi64((__m128i*)&c_data[a_ofs.y * block_width + a_ofs.x]);
      __m128i vector_c_epi8 = _mm_loadl_epi64((__m128i*)&c_data[0]);
      __m128i vector_b_epi8 = _mm_loadl_epi64((__m128i*)&c_data[b_ofs.y * block_width + b_ofs.x]);


      __m256i v_cat_epi32 = sao_calc_eo_cat_avx2(&vector_a_epi8, &vector_b_epi8, &vector_c_epi8);

      tmp_diff_epi32 = _mm256_sub_epi32(_mm256_cvtepu8_epi32(_mm_loadl_epi64((__m128i* __restrict)&(orig_data[y * block_width + x]))), _mm256_cvtepu8_epi32(vector_c_epi8));

      tmp_offset_epi32 = _mm256_permutevar8x32_epi32(offsets_epi32, v_cat_epi32);   

      // (diff - offset) * (diff - offset)
      tmp1_vec_epi32 = _mm256_mullo_epi32(_mm256_sub_epi32(tmp_diff_epi32, tmp_offset_epi32), _mm256_sub_epi32(tmp_diff_epi32, tmp_offset_epi32));

      // diff * diff
      tmp2_vec_epi32 = _mm256_mullo_epi32(tmp_diff_epi32, tmp_diff_epi32);

      // Offset is applied to reconstruction, so it is subtracted from diff.
      // sum += (diff - offset) * (diff - offset) - diff * diff;

      tmp_sum_epi32 = _mm256_add_epi32(tmp_sum_epi32, _mm256_sub_epi32(tmp1_vec_epi32, tmp2_vec_epi32));
    }

    // Load the last 6 pixels to use

    const kvz_pixel *c_data = &rec_data[y * block_width + x];

    __m128i vector_a_epi8 = load_6_pixels(&c_data[a_ofs.y * block_width + a_ofs.x]);
    __m128i vector_c_epi8 = load_6_pixels(c_data);
    __m128i vector_b_epi8 = load_6_pixels(&c_data[b_ofs.y * block_width + b_ofs.x]);

    __m256i v_cat_epi32 = sao_calc_eo_cat_avx2(&vector_a_epi8, &vector_b_epi8, &vector_c_epi8);

    const kvz_pixel* orig_ptr = &(orig_data[y * block_width + x]);

    tmp_diff_epi32 = _mm256_cvtepu8_epi32(load_6_pixels(orig_ptr));

    tmp_diff_epi32 = _mm256_sub_epi32(tmp_diff_epi32, _mm256_cvtepu8_epi32(vector_c_epi8));

    tmp_offset_epi32 = _mm256_permutevar8x32_epi32(offsets_epi32, v_cat_epi32);

    // (diff - offset) * (diff - offset)
    tmp1_vec_epi32 = _mm256_mullo_epi32(_mm256_sub_epi32(tmp_diff_epi32, tmp_offset_epi32), _mm256_sub_epi32(tmp_diff_epi32, tmp_offset_epi32));

    // diff * diff
    tmp2_vec_epi32 = _mm256_mullo_epi32(tmp_diff_epi32, tmp_diff_epi32);

    // Offset is applied to reconstruction, so it is subtracted from diff.
    // sum += (diff - offset) * (diff - offset) - diff * diff;

    tmp_sum_epi32 = _mm256_add_epi32(tmp_sum_epi32, _mm256_sub_epi32(tmp1_vec_epi32, tmp2_vec_epi32));

    tmp_sum_epi32 = _mm256_hadd_epi32(tmp_sum_epi32, tmp_sum_epi32);
    tmp_sum_epi32 = _mm256_hadd_epi32(tmp_sum_epi32, tmp_sum_epi32);

    tmp_sum_epi32 = _mm256_add_epi32(tmp_sum_epi32, _mm256_shuffle_epi32(tmp_sum_epi32, _MM_SHUFFLE(0, 1, 0, 1)));
    sum += _mm_cvtsi128_si32(_mm256_castsi256_si128(tmp_sum_epi32));

    tmp_sum_epi32 = _mm256_setzero_si256();
  }
  return sum;
}




/**
* \param orig_data  Original pixel data. 64x64 for luma, 32x32 for chroma.
* \param rec_data  Reconstructed pixel data. 64x64 for luma, 32x32 for chroma.
* \param dir_offsets
* \param is_chroma  0 for luma, 1 for chroma. Indicates
*/

// For some reason this solution doesn't work currently. Bug appears while adding. Counting should work
static void calc_sao_edge_dir_avx2(const kvz_pixel *orig_data,
 const kvz_pixel *rec_data,
 int eo_class,
 int block_width,
 int block_height,
 int cat_sum_cnt[2][NUM_SAO_EDGE_CATEGORIES])
{
  int y, x;
  vector2d_t a_ofs = g_sao_edge_offsets[eo_class][0];
  vector2d_t b_ofs = g_sao_edge_offsets[eo_class][1];
  // Arrays orig_data and rec_data are quarter size for chroma.

  // Don't sample the edge pixels because this function doesn't have access to
  // their neighbours.
  __m256i zeros_epi32 = _mm256_setzero_si256();
  __m256i ones_epi32 = _mm256_set1_epi32(1);
  __m256i twos_epi32 = _mm256_set1_epi32(2);
  __m256i threes_epi32 = _mm256_set1_epi32(3);
  __m256i fours_epi32 = _mm256_set1_epi32(4);

  __m256i v_diff_accum[NUM_SAO_EDGE_CATEGORIES] = { { 0 } };



  __m256i temp_epi32 = _mm256_setzero_si256();
  __m256i temp_mem_epi32 = _mm256_setzero_si256();

  for (y = 1; y < block_height - 1; ++y) {
    for (x = 1; x < block_width - 8; x += 8) {
      const kvz_pixel *c_data = &rec_data[y * block_width + x];

      __m128i vector_a_epi8 = _mm_loadl_epi64((__m128i*)&c_data[a_ofs.y * block_width + a_ofs.x]);
      __m128i vector_c_epi8 = _mm_loadl_epi64((__m128i*)c_data);
      __m128i vector_b_epi8 = _mm_loadl_epi64((__m128i*)&c_data[b_ofs.y * block_width + b_ofs.x]);


      __m256i v_cat_epi32 = sao_calc_eo_cat_avx2(&vector_a_epi8, &vector_b_epi8, &vector_c_epi8);

      // Check wich values are right for specific cat amount.
      // It's done for every single value that cat could get {1, 2, 0, 3, 4}

      //--------------------------------------------------------------------------
      // v_cat == 0
      __m256i mask_epi32 = _mm256_cmpeq_epi32(zeros_epi32, v_cat_epi32);

      temp_mem_epi32 = _mm256_sub_epi32(_mm256_cvtepu8_epi32(_mm_loadl_epi64((__m128i*)&(orig_data[y * block_width + x]))), _mm256_cvtepu8_epi32(vector_c_epi8));
      temp_epi32 = _mm256_and_si256(temp_mem_epi32, mask_epi32);
      v_diff_accum[0] = _mm256_add_epi32(v_diff_accum[0], temp_epi32);
      int temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32))/ 4;
      cat_sum_cnt[1][0] += temp_cnt;

      //--------------------------------------------------------------------------
      // v_cat == 1

      mask_epi32 = _mm256_cmpeq_epi32(ones_epi32, v_cat_epi32);
      temp_epi32 = _mm256_and_si256(temp_mem_epi32, mask_epi32);
      v_diff_accum[1] = _mm256_add_epi32(v_diff_accum[1], temp_epi32);
      temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
      cat_sum_cnt[1][1] += temp_cnt;

      //--------------------------------------------------------------------------
      // v_cat == 2

      mask_epi32 = _mm256_cmpeq_epi32(twos_epi32, v_cat_epi32);
      temp_epi32 = _mm256_and_si256(temp_mem_epi32, mask_epi32);
      v_diff_accum[2] = _mm256_add_epi32(v_diff_accum[2], temp_epi32);
      temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
      cat_sum_cnt[1][2] += temp_cnt;

      //--------------------------------------------------------------------------
      // v_cat == 3

      mask_epi32 = _mm256_cmpeq_epi32(threes_epi32, v_cat_epi32);
      temp_epi32 = _mm256_and_si256(temp_mem_epi32, mask_epi32);
      v_diff_accum[3] = _mm256_add_epi32(v_diff_accum[3], temp_epi32);
      temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
      cat_sum_cnt[1][3] += temp_cnt;

      //--------------------------------------------------------------------------
      // v_cat == 4

      mask_epi32 = _mm256_cmpeq_epi32(fours_epi32, v_cat_epi32);
      temp_epi32 = _mm256_and_si256(temp_mem_epi32, mask_epi32);
      v_diff_accum[4] = _mm256_add_epi32(v_diff_accum[4], temp_epi32);
      temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
      cat_sum_cnt[1][4] += temp_cnt;

      //--------------------------------------------------------------------------


    }

    if (block_width - x - 1 >= 6) {
      const kvz_pixel *c_data = &rec_data[y * block_width + x];

      __m128i vector_a_epi8 = load_6_pixels(&c_data[a_ofs.y * block_width + a_ofs.x]);
      __m128i vector_c_epi8 = load_6_pixels(c_data);
      __m128i vector_b_epi8 = load_6_pixels(&c_data[b_ofs.y * block_width + b_ofs.x]);

      __m256i v_cat_epi32 = sao_calc_eo_cat_avx2(&vector_a_epi8, &vector_b_epi8, &vector_c_epi8);

      const kvz_pixel* orig_ptr = &(orig_data[y * block_width + x]);

      temp_mem_epi32 = _mm256_cvtepu8_epi32(load_6_pixels(orig_ptr));

      temp_mem_epi32 = _mm256_sub_epi32(temp_mem_epi32, _mm256_cvtepu8_epi32(vector_c_epi8));


      // Check wich values are right for specific cat amount.
      // It's done for every single value that cat could get {1, 2, 0, 3, 4}
      //--------------------------------------------------------------------------
      __m256i mask_epi32 = _mm256_cmpeq_epi32(zeros_epi32, v_cat_epi32);
      temp_epi32 = _mm256_and_si256(temp_mem_epi32, mask_epi32);
      v_diff_accum[0] = _mm256_add_epi32(v_diff_accum[0], temp_epi32);
      int temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4 - 2;
      cat_sum_cnt[1][0] += temp_cnt;
      //--------------------------------------------------------------------------

      mask_epi32 = _mm256_cmpeq_epi32(ones_epi32, v_cat_epi32);
      temp_epi32 = _mm256_and_si256(temp_mem_epi32, mask_epi32);
      v_diff_accum[1] = _mm256_add_epi32(v_diff_accum[1], temp_epi32);
      temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
      cat_sum_cnt[1][1] += temp_cnt;

      //--------------------------------------------------------------------------

      mask_epi32 = _mm256_cmpeq_epi32(twos_epi32, v_cat_epi32);
      temp_epi32 = _mm256_and_si256(temp_mem_epi32, mask_epi32);
      v_diff_accum[2] = _mm256_add_epi32(v_diff_accum[2], temp_epi32);
      temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
      cat_sum_cnt[1][2] += temp_cnt;

      //--------------------------------------------------------------------------

      mask_epi32 = _mm256_cmpeq_epi32(threes_epi32, v_cat_epi32);
      temp_epi32 = _mm256_and_si256(temp_mem_epi32, mask_epi32);
      v_diff_accum[3] = _mm256_add_epi32(v_diff_accum[3], temp_epi32);
      temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
      cat_sum_cnt[1][3] += temp_cnt;

      //--------------------------------------------------------------------------

      mask_epi32 = _mm256_cmpeq_epi32(fours_epi32, v_cat_epi32);
      temp_epi32 = _mm256_and_si256(temp_mem_epi32, mask_epi32);
      v_diff_accum[4] = _mm256_add_epi32(v_diff_accum[4], temp_epi32);
      temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
      cat_sum_cnt[1][4] += temp_cnt;

      //--------------------------------------------------------------------------
      x += 6;
    }


    // If odd number of pixels left, use this
    for (x; x < block_width - 1; ++x) {
      const kvz_pixel *c_data = &rec_data[y * block_width + x];
      kvz_pixel a = c_data[a_ofs.y * block_width + a_ofs.x];
      kvz_pixel c = c_data[0];
      kvz_pixel b = c_data[b_ofs.y * block_width + b_ofs.x];

      int eo_cat = sao_calc_eo_cat(a, b, c);

      cat_sum_cnt[0][eo_cat] += orig_data[y * block_width + x] - c;
      cat_sum_cnt[1][eo_cat] += 1;
    }
  }

  for (int eo_cat = 0; eo_cat < NUM_SAO_EDGE_CATEGORIES; ++eo_cat) {
    int accum = 0;

    //Full horizontal sum of accumulated values
    v_diff_accum[eo_cat] = _mm256_add_epi32(v_diff_accum[eo_cat], _mm256_castsi128_si256(_mm256_extracti128_si256(v_diff_accum[eo_cat], 1)));
    v_diff_accum[eo_cat] = _mm256_add_epi32(v_diff_accum[eo_cat], _mm256_shuffle_epi32(v_diff_accum[eo_cat], _MM_SHUFFLE(1, 0, 3, 2)));
    v_diff_accum[eo_cat] = _mm256_add_epi32(v_diff_accum[eo_cat], _mm256_shuffle_epi32(v_diff_accum[eo_cat], _MM_SHUFFLE(0, 1, 0, 1)));
    accum += _mm_cvtsi128_si32(_mm256_castsi256_si128(v_diff_accum[eo_cat]));
    cat_sum_cnt[0][eo_cat] += accum;
  }
}

static void sao_reconstruct_color_avx2(const encoder_control_t * const encoder,
 const kvz_pixel *rec_data,
 kvz_pixel *new_rec_data,
 const sao_info_t *sao,
 int stride,
 int new_stride,
 int block_width,
 int block_height,
 color_t color_i)
{

  // Arrays orig_data and rec_data are quarter size for chroma.
  int offset_v = color_i == COLOR_V ? 5 : 0;

  if (sao->type == SAO_TYPE_BAND) {
    int offsets[1 << KVZ_BIT_DEPTH];
    kvz_calc_sao_offset_array(encoder, sao, offsets, color_i);
    unsigned char*temp;

    for (int y = 0; y < block_height; ++y) {
      for (int x = 0; x < block_width; x+=32) {

        //new_rec_data[y * new_stride + x] = offsets[rec_data[y * stride + x]];


        bool atleast_32_elements = (block_width - x) > 31;
        bool atleast_16_elements = (block_width - x) > 15;

        int choose = atleast_32_elements + atleast_16_elements;

        switch (choose) {

        case 2:;

          __m256i rec_data_256_epi8 = _mm256_loadu_si256((__m256i*)&rec_data[y * stride + x]);
          temp = (unsigned char*)&rec_data_256_epi8;

          __m256i offsets_256_epi8 = _mm256_set_epi8(offsets[temp[31]], offsets[temp[30]], offsets[temp[29]], offsets[temp[28]], offsets[temp[27]], offsets[temp[26]], offsets[temp[25]],
           offsets[temp[24]], offsets[temp[23]], offsets[temp[22]], offsets[temp[21]], offsets[temp[20]], offsets[temp[19]], offsets[temp[18]], offsets[temp[17]], offsets[temp[16]],
           offsets[temp[15]], offsets[temp[14]], offsets[temp[13]], offsets[temp[12]], offsets[temp[11]], offsets[temp[10]], offsets[temp[9]],
           offsets[temp[8]], offsets[temp[7]], offsets[temp[6]], offsets[temp[5]], offsets[temp[4]], offsets[temp[3]], offsets[temp[2]], offsets[temp[1]], offsets[temp[0]]);
          _mm256_storeu_si256((__m256i*)& new_rec_data[y * new_stride + x], offsets_256_epi8);
          break;

        case 1:;

          __m128i rec_data_128_epi8 = _mm_loadu_si128((__m128i*)&rec_data[y * stride + x]);
          temp = (unsigned char*)&rec_data_128_epi8;
          __m128i offsets_128_epi8 = _mm_set_epi8(offsets[temp[15]], offsets[temp[14]], offsets[temp[13]], offsets[temp[12]], offsets[temp[11]], offsets[temp[10]], offsets[temp[9]],
           offsets[temp[8]], offsets[temp[7]], offsets[temp[6]], offsets[temp[5]], offsets[temp[4]], offsets[temp[3]], offsets[temp[2]], offsets[temp[1]], offsets[temp[0]]);
          _mm_storeu_si128((__m128i*)& new_rec_data[y * new_stride + x], offsets_128_epi8);

          for (int i = x; i < block_width; i++) {
            new_rec_data[y * new_stride + i] = offsets[rec_data[y * stride + i]];
          }
          break;

        default:;

          for (int i = x; i < block_width; i++) {
            new_rec_data[y * new_stride + i] = offsets[rec_data[y * stride + i]];
          }
          break;
        }
      }
    }
  }
  else {

    // Don't sample the edge pixels because this function doesn't have access to
    // their neighbours.

    __m256i offset_v_epi32 = _mm256_set1_epi32(offset_v);

    vector2d_t a_ofs = g_sao_edge_offsets[sao->eo_class][0];
    vector2d_t b_ofs = g_sao_edge_offsets[sao->eo_class][1];

    for (int y = 0; y < block_height; ++y) {
      int x;
      for (x = 0; x < block_width; x += 8) {

        bool use_8_elements = (block_width - x) >= 8;

        switch (use_8_elements) {
        case true:;
          const kvz_pixel *c_data = &rec_data[y * stride + x];

          __m128i vector_a_epi8 = _mm_loadl_epi64((__m128i*)&c_data[a_ofs.y * stride + a_ofs.x]);
          __m128i vector_c_epi8 = _mm_loadl_epi64((__m128i*)&c_data[0]);
          __m128i vector_b_epi8 = _mm_loadl_epi64((__m128i*)&c_data[b_ofs.y * stride + b_ofs.x]);


          __m256i v_cat_epi32 = sao_calc_eo_cat_avx2(&vector_a_epi8, &vector_b_epi8, &vector_c_epi8);


          v_cat_epi32 = _mm256_add_epi32(v_cat_epi32, offset_v_epi32);

          __m256i vector_c_data0_epi32 = _mm256_cvtepu8_epi32(vector_c_epi8);


          int*temp = (int*)&v_cat_epi32;
          __m256i vector_sao_offsets_epi32 = _mm256_set_epi32(sao->offsets[temp[7]], sao->offsets[temp[6]], sao->offsets[temp[5]], sao->offsets[temp[4]], sao->offsets[temp[3]], sao->offsets[temp[2]], sao->offsets[temp[1]], sao->offsets[temp[0]]);
          vector_sao_offsets_epi32 = _mm256_add_epi32(vector_sao_offsets_epi32, vector_c_data0_epi32);


          // Convert int to int8_t
          __m256i temp_epi16 = _mm256_packus_epi32(vector_sao_offsets_epi32, vector_sao_offsets_epi32);
          temp_epi16 = _mm256_permute4x64_epi64(temp_epi16, _MM_SHUFFLE(3, 1, 2, 0));
          __m256i temp_epi8 = _mm256_packus_epi16(temp_epi16, temp_epi16);

          // Store 64-bits from vector to memory
          _mm_storel_epi64((__m128i*)&(new_rec_data[y * new_stride + x]), _mm256_castsi256_si128(temp_epi8));
          break;

        default:;
          for (int i = x; i < (block_width); ++i) {

            const kvz_pixel *c_data = &rec_data[y * stride + i];

            kvz_pixel *new_data = &new_rec_data[y * new_stride + i];
            kvz_pixel a = c_data[a_ofs.y * stride + a_ofs.x];
            kvz_pixel c = c_data[0];
            kvz_pixel b = c_data[b_ofs.y * stride + b_ofs.x];


            int eo_cat = sao_calc_eo_cat(a, b, c);

            new_data[0] = (kvz_pixel)CLIP(0, (1 << KVZ_BIT_DEPTH) - 1, c_data[0] + sao->offsets[eo_cat + offset_v]);

          }
          break;
        }


      }



    }
  }
}

static int sao_band_ddistortion_avx2(const encoder_state_t * const state,
 const kvz_pixel *orig_data,
 const kvz_pixel *rec_data,
 int block_width,
 int block_height,
 int band_pos,
 int sao_bands[4])
{
  int y, x;
  int shift = state->encoder_control->bitdepth - 5;
  int sum = 0;

  __m256i sum_epi32 = { 0 };

  __m256i band_pos_epi32 = _mm256_set1_epi32(band_pos);
  for (y = 0; y < block_height; ++y) {
    for (x = 0; x < block_width; x += 8) {
      bool use_8_elements =  (block_width - x) >= 8;

      switch (use_8_elements) {
      case true:;
        //int band = (rec_data[y * block_width + x] >> shift) - band_pos;

        __m256i band_epi32 = _mm256_cvtepu8_epi32(_mm_loadl_epi64((__m128i*)&(rec_data[y * block_width + x])));
        band_epi32 = _mm256_srli_epi32(band_epi32, shift);
        band_epi32 = _mm256_sub_epi32(band_epi32, band_pos_epi32);


        __m256i vector_mask = _mm256_cmpeq_epi32(_mm256_and_si256(_mm256_set1_epi32(~3), band_epi32), _mm256_setzero_si256());

        __m256i offset_epi32 = _mm256_permutevar8x32_epi32(_mm256_castsi128_si256(_mm_loadu_si128((__m128i*)sao_bands)), band_epi32);

        offset_epi32 = _mm256_and_si256(vector_mask, offset_epi32);

        __m256i orig_data_epi32 = _mm256_cvtepu8_epi32(_mm_loadl_epi64((__m128i*)&(orig_data[y * block_width + x])));
        __m256i rec_data_epi32 = _mm256_cvtepu8_epi32(_mm_loadl_epi64((__m128i*)&(rec_data[y * block_width + x])));
        __m256i diff_epi32 = _mm256_sub_epi32(orig_data_epi32, rec_data_epi32);

        __m256i diff_minus_offset_epi32 = _mm256_sub_epi32(diff_epi32, offset_epi32);

        __m256i temp_sum = _mm256_sub_epi32(_mm256_mullo_epi32(diff_minus_offset_epi32, diff_minus_offset_epi32), _mm256_mullo_epi32(diff_epi32, diff_epi32));

        sum_epi32 = _mm256_add_epi32(sum_epi32, temp_sum);


        break;

      default:;
        for (x; x < block_width; ++x) {
          int band = (rec_data[y * block_width + x] >> shift) - band_pos;
          int offset = 0;
          if (band >= 0 && band < 4) {
            offset = sao_bands[band];
          }
          if (offset != 0) {
            int diff = orig_data[y * block_width + x] - rec_data[y * block_width + x];
            // Offset is applied to reconstruction, so it is subtracted from diff.
            sum += (diff - offset) * (diff - offset) - diff * diff;
          }
        }
      }


    }
  }

  //Full horizontal sum
  sum_epi32 = _mm256_add_epi32(sum_epi32, _mm256_castsi128_si256(_mm256_extracti128_si256(sum_epi32, 1)));
  sum_epi32 = _mm256_add_epi32(sum_epi32, _mm256_shuffle_epi32(sum_epi32, _MM_SHUFFLE(1, 0, 3, 2)));
  sum_epi32 = _mm256_add_epi32(sum_epi32, _mm256_shuffle_epi32(sum_epi32, _MM_SHUFFLE(0, 1, 0, 1)));
  sum += _mm_cvtsi128_si32(_mm256_castsi256_si128(sum_epi32));

  return sum;

}

#endif //COMPILE_INTEL_AVX2

int kvz_strategy_register_sao_avx2(void* opaque, uint8_t bitdepth)
{
  bool success = true;
#if COMPILE_INTEL_AVX2
  if (bitdepth == 8) {
    //success &= kvz_strategyselector_register(opaque, "sao_edge_ddistortion", "avx2", 40, &sao_edge_ddistortion_avx2);
    success &= kvz_strategyselector_register(opaque, "calc_sao_edge_dir", "avx2", 40, &calc_sao_edge_dir_avx2);
    success &= kvz_strategyselector_register(opaque, "sao_reconstruct_color", "avx2", 40, &sao_reconstruct_color_avx2);
    success &= kvz_strategyselector_register(opaque, "sao_band_ddistortion", "avx2", 40, &sao_band_ddistortion_avx2);
  }
#endif //COMPILE_INTEL_AVX2
  return success;
}