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
*/
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 tmp_zero_values_epi32 = _mm256_setzero_si256();
 __m256i tmp_one_values_epi32 = _mm256_setzero_si256();
 __m256i tmp_two_values_epi32 = _mm256_setzero_si256();
 __m256i tmp_three_values_epi32 = _mm256_setzero_si256();
 __m256i tmp_four_values_epi32 = _mm256_setzero_si256();



 __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* __restrict)&c_data[a_ofs.y * block_width + a_ofs.x]);
   __m128i vector_c_epi8 = _mm_loadl_epi64((__m128i* __restrict)c_data);
   __m128i vector_b_epi8 = _mm_loadl_epi64((__m128i* __restrict)&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);
   int temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
   cat_sum_cnt[1][0] += temp_cnt;
   temp_mem_epi32 = _mm256_sub_epi32(_mm256_cvtepu8_epi32(_mm_loadl_epi64((__m128i* __restrict)&(orig_data[y * block_width + x]))), _mm256_cvtepu8_epi32(vector_c_epi8));
   temp_epi32 = _mm256_and_si256(mask_epi32, temp_mem_epi32);
   tmp_zero_values_epi32 = _mm256_add_epi32(tmp_zero_values_epi32, temp_epi32);
   //--------------------------------------------------------------------------
   // v_cat == 1

   mask_epi32 = _mm256_cmpeq_epi32(ones_epi32, v_cat_epi32);
   temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
   cat_sum_cnt[1][1] += temp_cnt;
   temp_epi32 = _mm256_and_si256(mask_epi32, temp_mem_epi32);
   tmp_one_values_epi32 = _mm256_add_epi32(tmp_zero_values_epi32, temp_epi32);
   //--------------------------------------------------------------------------
   // v_cat == 2

   mask_epi32 = _mm256_cmpeq_epi32(twos_epi32, v_cat_epi32);
   temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
   cat_sum_cnt[1][2] += temp_cnt;
   temp_epi32 = _mm256_and_si256(mask_epi32, temp_mem_epi32);
   tmp_two_values_epi32 = _mm256_add_epi32(tmp_zero_values_epi32, temp_epi32);
   //--------------------------------------------------------------------------
   // v_cat == 3

   mask_epi32 = _mm256_cmpeq_epi32(threes_epi32, v_cat_epi32);
   temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
   cat_sum_cnt[1][3] += temp_cnt;
   temp_epi32 = _mm256_and_si256(mask_epi32, temp_mem_epi32);
   tmp_three_values_epi32 = _mm256_add_epi32(tmp_zero_values_epi32, temp_epi32);
   //--------------------------------------------------------------------------
   // v_cat == 4

   mask_epi32 = _mm256_cmpeq_epi32(fours_epi32, v_cat_epi32);
   temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
   cat_sum_cnt[1][4] += temp_cnt;
   temp_epi32 = _mm256_and_si256(mask_epi32, temp_mem_epi32);
   tmp_four_values_epi32 = _mm256_add_epi32(tmp_zero_values_epi32, temp_epi32);
   //--------------------------------------------------------------------------


  }
  temp_epi32 = _mm256_hadd_epi32(tmp_zero_values_epi32, tmp_one_values_epi32);
  temp_mem_epi32 = _mm256_hadd_epi32(tmp_two_values_epi32, tmp_three_values_epi32);

  temp_epi32 = _mm256_hadd_epi32(temp_epi32, temp_mem_epi32);

  __m128i temp_epi32_lower = _mm256_castsi256_si128(temp_epi32);
  __m128i temp_epi32_upper = _mm256_extracti128_si256(temp_epi32, 1);

  __m128i temp_epi32_sum = _mm_add_epi32(temp_epi32_lower, temp_epi32_upper);

  int*temp = (int*)&temp_epi32_sum;

  cat_sum_cnt[0][0] += temp[0];
  cat_sum_cnt[0][1] += temp[1];
  cat_sum_cnt[0][2] += temp[2];
  cat_sum_cnt[0][3] += temp[3];

  __m128i tmp_four_values_epi32_lower = _mm256_castsi256_si128(tmp_four_values_epi32);
  __m128i tmp_four_values_epi32_upper = _mm256_extracti128_si256(tmp_four_values_epi32, 1);
  __m128i tmp_four_values_epi32_sum = _mm_add_epi32(tmp_four_values_epi32_lower, tmp_four_values_epi32_upper);
  tmp_four_values_epi32_sum = _mm_add_epi64(tmp_four_values_epi32_sum, tmp_four_values_epi32_sum);

  temp = (int*)&tmp_four_values_epi32_sum;
  cat_sum_cnt[0][4] += (temp[0] + temp[1]);

  bool use_6_elements = block_width - x - 1 == 6;
  switch (use_6_elements) {
  case true:;

   // 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]);

   __m256i 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);
   int temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4 - 2;
   cat_sum_cnt[1][0] += temp_cnt;
   temp_epi32 = _mm256_and_si256(mask_epi32, temp_mem_epi32);
   tmp_zero_values_epi32 = _mm256_add_epi32(tmp_zero_values_epi32, temp_epi32);
   //--------------------------------------------------------------------------

   mask_epi32 = _mm256_cmpeq_epi32(ones_epi32, v_cat_epi32);
   temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
   cat_sum_cnt[1][1] += temp_cnt;
   temp_epi32 = _mm256_and_si256(mask_epi32, temp_mem_epi32);
   tmp_one_values_epi32 = _mm256_add_epi32(tmp_zero_values_epi32, temp_epi32);
   //--------------------------------------------------------------------------

   mask_epi32 = _mm256_cmpeq_epi32(twos_epi32, v_cat_epi32);
   temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
   cat_sum_cnt[1][2] += temp_cnt;
   temp_epi32 = _mm256_and_si256(mask_epi32, temp_mem_epi32);
   tmp_two_values_epi32 = _mm256_add_epi32(tmp_zero_values_epi32, temp_epi32);
   //--------------------------------------------------------------------------

   mask_epi32 = _mm256_cmpeq_epi32(threes_epi32, v_cat_epi32);
   temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
   cat_sum_cnt[1][3] += temp_cnt;
   temp_epi32 = _mm256_and_si256(mask_epi32, temp_mem_epi32);
   tmp_three_values_epi32 = _mm256_add_epi32(tmp_zero_values_epi32, temp_epi32);
   //--------------------------------------------------------------------------

   mask_epi32 = _mm256_cmpeq_epi32(fours_epi32, v_cat_epi32);
   temp_cnt = _mm_popcnt_u32(_mm256_movemask_epi8(mask_epi32)) / 4;
   cat_sum_cnt[1][4] += temp_cnt;
   temp_epi32 = _mm256_and_si256(mask_epi32, temp_mem_epi32);
   tmp_four_values_epi32 = _mm256_add_epi32(tmp_zero_values_epi32, temp_epi32);
   //--------------------------------------------------------------------------

   temp_epi32 = _mm256_hadd_epi32(tmp_zero_values_epi32, tmp_one_values_epi32);

   temp_mem_epi32 = _mm256_hadd_epi32(tmp_two_values_epi32, tmp_three_values_epi32);
   temp_mem_epi32 = _mm256_hadd_epi32(temp_epi32, temp_mem_epi32);

   temp_epi32_lower = _mm256_castsi256_si128(temp_epi32);
   temp_epi32_upper = _mm256_extracti128_si256(temp_epi32, 1);

   temp_epi32_sum = _mm_add_epi32(temp_epi32_lower, temp_epi32_upper);
   temp = (int*)&temp_epi32_sum;

   cat_sum_cnt[0][0] += temp[0];
   cat_sum_cnt[0][1] += temp[1];
   cat_sum_cnt[0][2] += temp[2];
   cat_sum_cnt[0][3] += temp[3];

   tmp_four_values_epi32_lower = _mm256_castsi256_si128(tmp_four_values_epi32);
   tmp_four_values_epi32_upper = _mm256_extracti128_si256(tmp_four_values_epi32, 1);
   tmp_four_values_epi32_sum = _mm_add_epi32(tmp_four_values_epi32_lower, tmp_four_values_epi32_upper);
   tmp_four_values_epi32_sum = _mm_add_epi64(tmp_four_values_epi32_sum, tmp_four_values_epi32_sum);

   temp = (int*)&tmp_four_values_epi32_sum;
   cat_sum_cnt[0][4] += (temp[0] + temp[1]);
   break;

  default:
   // Use when theres odd number of pixels left
   for (int i = x; i < block_width - 1; ++i) {
    const kvz_pixel *c_data = &rec_data[y * block_width + i];
    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 + i] - c;
    cat_sum_cnt[1][eo_cat] += 1;
   }


   break;
  }
 }
}

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 = _mm256_setzero_si256();

 __m256i band_pos_epi32 = _mm256_set1_epi32(band_pos);

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

   //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 offset_epi32 = _mm256_permutevar8x32_epi32(_mm256_castsi128_si256(_mm_loadu_si128((__m128i*)sao_bands)), band_epi32);
   __m256i temp1 = _mm256_cmpeq_epi32(offset_epi32, band_epi32);
   temp1 = _mm256_or_si256(temp1, _mm256_cmpgt_epi32(band_epi32, offset_epi32));
   __m256i temp2 = _mm256_cmpgt_epi32(_mm256_set1_epi32(4), band_epi32);

   __m256i mask_epi32 = _mm256_andnot_si256(temp2, temp1);

   __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);

   temp1 = _mm256_sub_epi32(diff_epi32, offset_epi32);
   temp1 = _mm256_mullo_epi32(temp1, temp1);

   temp2 = _mm256_mullo_epi32(diff_epi32, diff_epi32);

   temp1 = _mm256_sub_epi32(temp1, temp2);
   temp1 = _mm256_and_si256(temp1, mask_epi32);

   sum_epi32 = _mm256_add_epi32(sum_epi32, temp1);
  }
 }

 sum_epi32 = _mm256_hadd_epi32(sum_epi32, sum_epi32);
 sum_epi32 = _mm256_hadd_epi32(sum_epi32, sum_epi32);

 sum = _mm256_extract_epi32(sum_epi32, 0) + _mm256_extract_epi32(sum_epi32, 4);

 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;
}