/*
 * Copyright (c) 2020, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 */

#include <assert.h>
#include <immintrin.h>  // AVX2

#include "config/aom_dsp_rtcd.h"
#include "aom_dsp/aom_filter.h"
#include "aom_dsp/x86/synonyms.h"

typedef void (*high_variance_fn_t)(const uint16_t *src, int src_stride,
                                   const uint16_t *ref, int ref_stride,
                                   uint32_t *sse, int *sum);

static uint32_t aom_highbd_var_filter_block2d_bil_avx2(
    const uint8_t *src_ptr8, unsigned int src_pixels_per_line, int pixel_step,
    unsigned int output_height, unsigned int output_width,
    const uint32_t xoffset, const uint32_t yoffset, const uint8_t *dst_ptr8,
    int dst_stride, uint32_t *sse) {
  const __m256i filter1 =
      _mm256_set1_epi32((uint32_t)(bilinear_filters_2t[xoffset][1] << 16) |
                        bilinear_filters_2t[xoffset][0]);
  const __m256i filter2 =
      _mm256_set1_epi32((uint32_t)(bilinear_filters_2t[yoffset][1] << 16) |
                        bilinear_filters_2t[yoffset][0]);
  const __m256i one = _mm256_set1_epi16(1);
  const uint32_t bitshift = (uint32_t)0x40;
  unsigned int i, j, prev = 0, curr = 2, next = 4;
  uint16_t *src_ptr = CONVERT_TO_SHORTPTR(src_ptr8);
  uint16_t *dst_ptr = CONVERT_TO_SHORTPTR(dst_ptr8);
  uint16_t *src_ptr_ref = src_ptr;
  uint16_t *dst_ptr_ref = dst_ptr;
  int64_t sum_long = 0;
  uint64_t sse_long = 0;
  unsigned int rshift = 0, inc = 1;
  __m256i rbias = _mm256_set1_epi32(bitshift);
  __m256i src[4], opointer[8];
  __m128i src0[6], dst0[2];
  __m256i src1, dst1;
  unsigned int range;
  if (xoffset == 0) {
    if (yoffset == 0) {
      switch (output_width) {
        case 8:
          if (output_height == 4) inc = 2;
          for (j = 0; j < output_height * inc / 8; j++) {
            __m256i sum1 = _mm256_setzero_si256();
            __m256i sse1 = _mm256_setzero_si256();
            for (i = 0; i < 8 / inc; i += 2) {
              if (i == 0 && j == 0) {
                src0[0] = _mm_loadu_si128((const __m128i *)src_ptr);
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[2] = _mm_loadu_si128((const __m128i *)src_ptr);
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
              } else {
                src0[prev] = _mm_loadu_si128((const __m128i *)src_ptr);
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[curr] = _mm_loadu_si128((const __m128i *)src_ptr);
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
              }

              src1 = _mm256_insertf128_si256(filter1, src0[prev], 0);
              __m256i V_S_SRC = _mm256_insertf128_si256(src1, src0[curr], 1);

              dst0[0] = _mm_loadu_si128((const __m128i *)dst_ptr);
              dst_ptr += dst_stride;
              dst0[1] = _mm_loadu_si128((const __m128i *)dst_ptr);
              dst_ptr += dst_stride;

              __m256i V_S_D1 = _mm256_castsi128_si256(dst0[0]);
              dst1 = _mm256_insertf128_si256(V_S_D1, dst0[1], 1);

              __m256i V_S_SUB = _mm256_sub_epi16(V_S_SRC, dst1);
              __m256i V_S_MAD = _mm256_madd_epi16(V_S_SUB, V_S_SUB);
              sum1 = _mm256_add_epi16(sum1, V_S_SUB);
              sse1 = _mm256_add_epi32(sse1, V_S_MAD);
            }
            __m256i v_sum00 =
                _mm256_cvtepi16_epi32(_mm256_castsi256_si128(sum1));
            __m256i v_sum01 =
                _mm256_cvtepi16_epi32(_mm256_extracti128_si256(sum1, 1));
            __m256i v_sum0 = _mm256_add_epi32(v_sum00, v_sum01);
            __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
            __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
            __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
            const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
            const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
            __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
            v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
            sum_long += _mm_extract_epi32(v_d, 0);
            sse_long += _mm_extract_epi32(v_d, 1);
          }
          rshift = get_msb(output_height) + 3;

          break;

        default:
          range = output_width / 16;
          if (output_height == 8) inc = 2;
          if (output_height == 4) inc = 4;
          for (j = 0; j < range * output_height * inc / 16; j++) {
            if (j % (output_height * inc / 16) == 0) {
              src_ptr = src_ptr_ref;
              src_ptr_ref += 16;
              dst_ptr = dst_ptr_ref;
              dst_ptr_ref += 16;
            }

            __m256i sum1 = _mm256_setzero_si256();
            __m256i sse1 = _mm256_setzero_si256();

            for (i = 0; i < 16 / inc; ++i) {
              __m256i V_S_SRC = _mm256_loadu_si256((const __m256i *)src_ptr);

              src_ptr += src_pixels_per_line;

              __m256i V_D_DST = _mm256_loadu_si256((const __m256i *)dst_ptr);
              dst_ptr += dst_stride;

              __m256i V_R_SUB = _mm256_sub_epi16(V_S_SRC, V_D_DST);
              __m256i V_R_MAD = _mm256_madd_epi16(V_R_SUB, V_R_SUB);

              sum1 = _mm256_add_epi16(sum1, V_R_SUB);
              sse1 = _mm256_add_epi32(sse1, V_R_MAD);
            }

            __m256i v_sum0 = _mm256_madd_epi16(sum1, one);
            __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
            __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
            __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
            const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
            const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
            __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
            v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
            sum_long += _mm_extract_epi32(v_d, 0);
            sse_long += _mm_extract_epi32(v_d, 1);
          }

          rshift = get_msb(output_height) + get_msb(output_width);
      }
    } else if (yoffset == 8) {
      switch (output_width) {
        case 8:
          if (output_height == 4) inc = 2;
          for (j = 0; j < output_height * inc / 8; j++) {
            __m256i sum1 = _mm256_setzero_si256();
            __m256i sse1 = _mm256_setzero_si256();
            for (i = 0; i < 8 / inc; i += 2) {
              if (i == 0 && j == 0) {
                src0[0] = _mm_loadu_si128((const __m128i *)src_ptr);
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[2] = _mm_loadu_si128((const __m128i *)src_ptr);
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[4] = _mm_loadu_si128((const __m128i *)src_ptr);
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
              } else {
                prev = next;
                curr = (next + 2) % 6;
                next = (next + 4) % 6;
                src0[curr] = _mm_loadu_si128((const __m128i *)src_ptr);
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[next] = _mm_loadu_si128((const __m128i *)src_ptr);
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
              }

              src1 = _mm256_insertf128_si256(filter1, src0[prev], 0);
              src[0] = _mm256_insertf128_si256(src1, src0[curr], 1);

              src1 = _mm256_insertf128_si256(filter1, src0[curr], 0);
              src[2] = _mm256_insertf128_si256(src1, src0[next], 1);

              __m256i V_S_SRC = _mm256_avg_epu16(src[0], src[2]);

              dst0[0] = _mm_loadu_si128((const __m128i *)dst_ptr);
              dst_ptr += dst_stride;
              dst0[1] = _mm_loadu_si128((const __m128i *)dst_ptr);
              dst_ptr += dst_stride;

              __m256i V_S_D1 = _mm256_castsi128_si256(dst0[0]);
              dst1 = _mm256_insertf128_si256(V_S_D1, dst0[1], 1);

              __m256i V_S_SUB = _mm256_sub_epi16(V_S_SRC, dst1);
              __m256i V_S_MAD = _mm256_madd_epi16(V_S_SUB, V_S_SUB);
              sum1 = _mm256_add_epi16(sum1, V_S_SUB);
              sse1 = _mm256_add_epi32(sse1, V_S_MAD);
            }
            __m256i v_sum00 =
                _mm256_cvtepi16_epi32(_mm256_castsi256_si128(sum1));
            __m256i v_sum01 =
                _mm256_cvtepi16_epi32(_mm256_extracti128_si256(sum1, 1));
            __m256i v_sum0 = _mm256_add_epi32(v_sum00, v_sum01);
            __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
            __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
            __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
            const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
            const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
            __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
            v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
            sum_long += _mm_extract_epi32(v_d, 0);
            sse_long += _mm_extract_epi32(v_d, 1);
          }
          switch (output_height) {
            case 16: rshift = 7; break;
            case 8: rshift = 6; break;
            case 4: rshift = 5; break;
          }

          break;

        default:
          range = output_width / 16;
          if (output_height == 8) inc = 2;
          if (output_height == 4) inc = 4;
          for (j = 0; j < range * output_height * inc / 16; j++) {
            if (j % (output_height * inc / 16) == 0) {
              src_ptr = src_ptr_ref;
              src_ptr_ref += 16;
              dst_ptr = dst_ptr_ref;
              dst_ptr_ref += 16;

              opointer[0] = _mm256_loadu_si256((const __m256i *)src_ptr);
              src_ptr += src_pixels_per_line;
              curr = 0;
            }

            __m256i sum1 = _mm256_setzero_si256();
            __m256i sse1 = _mm256_setzero_si256();

            for (i = 0; i < 16 / inc; ++i) {
              prev = curr;
              curr = (curr == 0) ? 1 : 0;
              opointer[curr] = _mm256_loadu_si256((const __m256i *)src_ptr);
              src_ptr += src_pixels_per_line;

              __m256i V_S_SRC =
                  _mm256_avg_epu16(opointer[curr], opointer[prev]);

              __m256i V_D_DST = _mm256_loadu_si256((const __m256i *)dst_ptr);
              dst_ptr += dst_stride;
              __m256i V_R_SUB = _mm256_sub_epi16(V_S_SRC, V_D_DST);
              __m256i V_R_MAD = _mm256_madd_epi16(V_R_SUB, V_R_SUB);
              sum1 = _mm256_add_epi16(sum1, V_R_SUB);
              sse1 = _mm256_add_epi32(sse1, V_R_MAD);
            }

            __m256i v_sum0 = _mm256_madd_epi16(sum1, one);
            __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
            __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
            __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
            const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
            const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
            __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
            v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
            sum_long += _mm_extract_epi32(v_d, 0);
            sse_long += _mm_extract_epi32(v_d, 1);
          }

          rshift = get_msb(output_height) + get_msb(output_width);
      }

    } else {
      switch (output_width) {
        case 8:
          if (output_height == 4) inc = 2;
          for (j = 0; j < output_height * inc / 8; j++) {
            __m256i sum1 = _mm256_setzero_si256();
            __m256i sse1 = _mm256_setzero_si256();
            for (i = 0; i < 8 / inc; i += 2) {
              if (i == 0 && j == 0) {
                src0[0] = _mm_loadu_si128((const __m128i *)src_ptr);
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[2] = _mm_loadu_si128((const __m128i *)src_ptr);
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[4] = _mm_loadu_si128((const __m128i *)src_ptr);
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
              } else {
                prev = next;
                curr = (next + 2) % 6;
                next = (next + 4) % 6;
                src0[curr] = _mm_loadu_si128((const __m128i *)src_ptr);
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[next] = _mm_loadu_si128((const __m128i *)src_ptr);
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
              }

              src1 = _mm256_insertf128_si256(filter1, src0[prev], 0);
              src[0] = _mm256_insertf128_si256(src1, src0[curr], 1);

              src1 = _mm256_insertf128_si256(filter1, src0[curr], 0);
              src[2] = _mm256_insertf128_si256(src1, src0[next], 1);

              __m256i V_V_M1 = _mm256_unpacklo_epi16(src[0], src[2]);
              __m256i V_V_M2 = _mm256_unpackhi_epi16(src[0], src[2]);

              __m256i V_V_MAD1 = _mm256_madd_epi16(V_V_M1, filter2);
              __m256i V_V_MAD2 = _mm256_madd_epi16(V_V_M2, filter2);

              __m256i V_V_S1 =
                  _mm256_srli_epi32(_mm256_add_epi32(V_V_MAD1, rbias), 7);
              __m256i V_V_S2 =
                  _mm256_srli_epi32(_mm256_add_epi32(V_V_MAD2, rbias), 7);

              __m256i V_S_SRC = _mm256_packus_epi32(V_V_S1, V_V_S2);

              dst0[0] = _mm_loadu_si128((const __m128i *)dst_ptr);
              dst_ptr += dst_stride;
              dst0[1] = _mm_loadu_si128((const __m128i *)dst_ptr);
              dst_ptr += dst_stride;

              __m256i V_S_D1 = _mm256_castsi128_si256(dst0[0]);
              dst1 = _mm256_insertf128_si256(V_S_D1, dst0[1], 1);

              __m256i V_S_SUB = _mm256_sub_epi16(V_S_SRC, dst1);
              __m256i V_S_MAD = _mm256_madd_epi16(V_S_SUB, V_S_SUB);
              sum1 = _mm256_add_epi16(sum1, V_S_SUB);
              sse1 = _mm256_add_epi32(sse1, V_S_MAD);
            }
            __m256i v_sum00 =
                _mm256_cvtepi16_epi32(_mm256_castsi256_si128(sum1));
            __m256i v_sum01 =
                _mm256_cvtepi16_epi32(_mm256_extracti128_si256(sum1, 1));
            __m256i v_sum0 = _mm256_add_epi32(v_sum00, v_sum01);
            __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
            __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
            __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
            const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
            const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
            __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
            v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
            sum_long += _mm_extract_epi32(v_d, 0);
            sse_long += _mm_extract_epi32(v_d, 1);
          }

          rshift = get_msb(output_height) + 3;

          break;

        default:
          range = output_width / 16;
          if (output_height == 8) inc = 2;
          if (output_height == 4) inc = 4;
          for (j = 0; j < range * output_height * inc / 16; j++) {
            if (j % (output_height * inc / 16) == 0) {
              src_ptr = src_ptr_ref;
              src_ptr_ref += 16;
              dst_ptr = dst_ptr_ref;
              dst_ptr_ref += 16;

              opointer[0] = _mm256_loadu_si256((const __m256i *)src_ptr);
              src_ptr += src_pixels_per_line;
              curr = 0;
            }

            __m256i sum1 = _mm256_setzero_si256();
            __m256i sse1 = _mm256_setzero_si256();

            for (i = 0; i < 16 / inc; ++i) {
              prev = curr;
              curr = (curr == 0) ? 1 : 0;
              opointer[curr] = _mm256_loadu_si256((const __m256i *)src_ptr);
              src_ptr += src_pixels_per_line;

              __m256i V_S_M1 =
                  _mm256_unpacklo_epi16(opointer[prev], opointer[curr]);
              __m256i V_S_M2 =
                  _mm256_unpackhi_epi16(opointer[prev], opointer[curr]);

              __m256i V_S_MAD1 = _mm256_madd_epi16(V_S_M1, filter2);
              __m256i V_S_MAD2 = _mm256_madd_epi16(V_S_M2, filter2);

              __m256i V_S_S1 =
                  _mm256_srli_epi32(_mm256_add_epi32(V_S_MAD1, rbias), 7);
              __m256i V_S_S2 =
                  _mm256_srli_epi32(_mm256_add_epi32(V_S_MAD2, rbias), 7);

              __m256i V_S_SRC = _mm256_packus_epi32(V_S_S1, V_S_S2);

              __m256i V_D_DST = _mm256_loadu_si256((const __m256i *)dst_ptr);
              dst_ptr += dst_stride;

              __m256i V_R_SUB = _mm256_sub_epi16(V_S_SRC, V_D_DST);
              __m256i V_R_MAD = _mm256_madd_epi16(V_R_SUB, V_R_SUB);

              sum1 = _mm256_add_epi16(sum1, V_R_SUB);
              sse1 = _mm256_add_epi32(sse1, V_R_MAD);
            }

            __m256i v_sum0 = _mm256_madd_epi16(sum1, one);
            __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
            __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
            __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
            const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
            const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
            __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
            v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
            sum_long += _mm_extract_epi32(v_d, 0);
            sse_long += _mm_extract_epi32(v_d, 1);
          }

          rshift = get_msb(output_height) + get_msb(output_width);
      }
    }
  } else if (xoffset == 8) {
    if (yoffset == 0) {
      switch (output_width) {
        case 8:
          if (output_height == 4) inc = 2;
          for (j = 0; j < output_height * inc / 8; j++) {
            __m256i sum1 = _mm256_setzero_si256();
            __m256i sse1 = _mm256_setzero_si256();
            for (i = 0; i < 8 / inc; i += 2) {
              if (i == 0 && j == 0) {
                src0[0] = _mm_loadu_si128((const __m128i *)src_ptr);
                src0[1] =
                    _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[2] = _mm_loadu_si128((const __m128i *)src_ptr);
                src0[3] =
                    _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[4] = _mm_loadu_si128((const __m128i *)src_ptr);
                src0[5] =
                    _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
              } else {
                prev = next;
                curr = (next + 2) % 6;
                next = (next + 4) % 6;
                src0[curr] = _mm_loadu_si128((const __m128i *)src_ptr);
                src0[curr + 1] =
                    _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[next] = _mm_loadu_si128((const __m128i *)src_ptr);
                src0[next + 1] =
                    _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
              }

              src1 = _mm256_insertf128_si256(filter1, src0[prev], 0);
              src[0] = _mm256_insertf128_si256(src1, src0[curr], 1);

              src1 = _mm256_insertf128_si256(filter1, src0[prev + 1], 0);
              src[1] = _mm256_insertf128_si256(src1, src0[curr + 1], 1);

              __m256i V_S_SRC = _mm256_avg_epu16(src[0], src[1]);

              dst0[0] = _mm_loadu_si128((const __m128i *)dst_ptr);
              dst_ptr += dst_stride;
              dst0[1] = _mm_loadu_si128((const __m128i *)dst_ptr);
              dst_ptr += dst_stride;

              __m256i V_S_D1 = _mm256_castsi128_si256(dst0[0]);
              dst1 = _mm256_insertf128_si256(V_S_D1, dst0[1], 1);

              __m256i V_S_SUB = _mm256_sub_epi16(V_S_SRC, dst1);
              __m256i V_S_MAD = _mm256_madd_epi16(V_S_SUB, V_S_SUB);
              sum1 = _mm256_add_epi16(sum1, V_S_SUB);
              sse1 = _mm256_add_epi32(sse1, V_S_MAD);
            }
            __m256i v_sum00 =
                _mm256_cvtepi16_epi32(_mm256_castsi256_si128(sum1));
            __m256i v_sum01 =
                _mm256_cvtepi16_epi32(_mm256_extracti128_si256(sum1, 1));
            __m256i v_sum0 = _mm256_add_epi32(v_sum00, v_sum01);
            __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
            __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
            __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
            const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
            const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
            __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
            v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
            sum_long += _mm_extract_epi32(v_d, 0);
            sse_long += _mm_extract_epi32(v_d, 1);
          }

          rshift = get_msb(output_height) + 3;

          break;

        default:
          range = output_width / 16;
          if (output_height == 8) inc = 2;
          if (output_height == 4) inc = 4;
          for (j = 0; j < range * output_height * inc / 16; j++) {
            if (j % (output_height * inc / 16) == 0) {
              src_ptr = src_ptr_ref;
              src_ptr_ref += 16;
              dst_ptr = dst_ptr_ref;
              dst_ptr_ref += 16;
              __m256i V_H_D1 = _mm256_loadu_si256((const __m256i *)src_ptr);
              __m256i V_H_D2 =
                  _mm256_loadu_si256((const __m256i *)(src_ptr + 1));
              src_ptr += src_pixels_per_line;

              opointer[0] = _mm256_avg_epu16(V_H_D1, V_H_D2);

              curr = 0;
            }

            __m256i sum1 = _mm256_setzero_si256();
            __m256i sse1 = _mm256_setzero_si256();

            for (i = 0; i < 16 / inc; ++i) {
              prev = curr;
              curr = (curr == 0) ? 1 : 0;
              __m256i V_V_D1 = _mm256_loadu_si256((const __m256i *)src_ptr);
              __m256i V_V_D2 =
                  _mm256_loadu_si256((const __m256i *)(src_ptr + 1));
              src_ptr += src_pixels_per_line;

              opointer[curr] = _mm256_avg_epu16(V_V_D1, V_V_D2);

              __m256i V_S_M1 =
                  _mm256_unpacklo_epi16(opointer[prev], opointer[curr]);
              __m256i V_S_M2 =
                  _mm256_unpackhi_epi16(opointer[prev], opointer[curr]);

              __m256i V_S_MAD1 = _mm256_madd_epi16(V_S_M1, filter2);
              __m256i V_S_MAD2 = _mm256_madd_epi16(V_S_M2, filter2);

              __m256i V_S_S1 =
                  _mm256_srli_epi32(_mm256_add_epi32(V_S_MAD1, rbias), 7);
              __m256i V_S_S2 =
                  _mm256_srli_epi32(_mm256_add_epi32(V_S_MAD2, rbias), 7);

              __m256i V_S_SRC = _mm256_packus_epi32(V_S_S1, V_S_S2);

              __m256i V_D_DST = _mm256_loadu_si256((const __m256i *)dst_ptr);
              dst_ptr += dst_stride;

              __m256i V_R_SUB = _mm256_sub_epi16(V_S_SRC, V_D_DST);
              __m256i V_R_MAD = _mm256_madd_epi16(V_R_SUB, V_R_SUB);

              sum1 = _mm256_add_epi16(sum1, V_R_SUB);
              sse1 = _mm256_add_epi32(sse1, V_R_MAD);
            }

            __m256i v_sum0 = _mm256_madd_epi16(sum1, one);
            __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
            __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
            __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
            const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
            const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
            __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
            v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
            sum_long += _mm_extract_epi32(v_d, 0);
            sse_long += _mm_extract_epi32(v_d, 1);
          }

          rshift = get_msb(output_height) + get_msb(output_width);
      }
    } else if (yoffset == 8) {
      switch (output_width) {
        case 8:
          if (output_height == 4) inc = 2;
          for (j = 0; j < output_height * inc / 8; j++) {
            __m256i sum1 = _mm256_setzero_si256();
            __m256i sse1 = _mm256_setzero_si256();
            for (i = 0; i < 8 / inc; i += 2) {
              if (i == 0 && j == 0) {
                src0[0] = _mm_loadu_si128((const __m128i *)src_ptr);
                src0[1] =
                    _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[2] = _mm_loadu_si128((const __m128i *)src_ptr);
                src0[3] =
                    _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[4] = _mm_loadu_si128((const __m128i *)src_ptr);
                src0[5] =
                    _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
              } else {
                prev = next;
                curr = (next + 2) % 6;
                next = (next + 4) % 6;
                src0[curr] = _mm_loadu_si128((const __m128i *)src_ptr);
                src0[curr + 1] =
                    _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[next] = _mm_loadu_si128((const __m128i *)src_ptr);
                src0[next + 1] =
                    _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
              }

              src1 = _mm256_insertf128_si256(filter1, src0[prev], 0);
              src[0] = _mm256_insertf128_si256(src1, src0[curr], 1);

              src1 = _mm256_insertf128_si256(filter1, src0[prev + 1], 0);
              src[1] = _mm256_insertf128_si256(src1, src0[curr + 1], 1);

              src1 = _mm256_insertf128_si256(filter1, src0[curr], 0);
              src[2] = _mm256_insertf128_si256(src1, src0[next], 1);

              src1 = _mm256_insertf128_si256(filter1, src0[curr + 1], 0);
              src[3] = _mm256_insertf128_si256(src1, src0[next + 1], 1);

              __m256i V_S_SRC = _mm256_avg_epu16(src[0], src[1]);
              __m256i V_S_SRC1 = _mm256_avg_epu16(src[2], src[3]);

              V_S_SRC = _mm256_avg_epu16(V_S_SRC, V_S_SRC1);

              dst0[0] = _mm_loadu_si128((const __m128i *)dst_ptr);
              dst_ptr += dst_stride;
              dst0[1] = _mm_loadu_si128((const __m128i *)dst_ptr);
              dst_ptr += dst_stride;

              __m256i V_S_D1 = _mm256_castsi128_si256(dst0[0]);
              dst1 = _mm256_insertf128_si256(V_S_D1, dst0[1], 1);

              __m256i V_S_SUB = _mm256_sub_epi16(V_S_SRC, dst1);
              __m256i V_S_MAD = _mm256_madd_epi16(V_S_SUB, V_S_SUB);
              sum1 = _mm256_add_epi16(sum1, V_S_SUB);
              sse1 = _mm256_add_epi32(sse1, V_S_MAD);
            }
            __m256i v_sum00 =
                _mm256_cvtepi16_epi32(_mm256_castsi256_si128(sum1));
            __m256i v_sum01 =
                _mm256_cvtepi16_epi32(_mm256_extracti128_si256(sum1, 1));
            __m256i v_sum0 = _mm256_add_epi32(v_sum00, v_sum01);
            __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
            __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
            __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
            const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
            const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
            __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
            v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
            sum_long += _mm_extract_epi32(v_d, 0);
            sse_long += _mm_extract_epi32(v_d, 1);
          }

          rshift = get_msb(output_height) + 3;

          break;

        default:
          range = output_width / 16;
          if (output_height == 8) inc = 2;
          if (output_height == 4) inc = 4;
          for (j = 0; j < range * output_height * inc / 16; j++) {
            if (j % (output_height * inc / 16) == 0) {
              src_ptr = src_ptr_ref;
              src_ptr_ref += 16;
              dst_ptr = dst_ptr_ref;
              dst_ptr_ref += 16;

              __m256i V_H_D1 = _mm256_loadu_si256((const __m256i *)src_ptr);
              __m256i V_H_D2 =
                  _mm256_loadu_si256((const __m256i *)(src_ptr + 1));
              src_ptr += src_pixels_per_line;
              opointer[0] = _mm256_avg_epu16(V_H_D1, V_H_D2);
              curr = 0;
            }

            __m256i sum1 = _mm256_setzero_si256();
            __m256i sse1 = _mm256_setzero_si256();

            for (i = 0; i < 16 / inc; ++i) {
              prev = curr;
              curr = (curr == 0) ? 1 : 0;
              __m256i V_V_D1 = _mm256_loadu_si256((const __m256i *)src_ptr);
              __m256i V_V_D2 =
                  _mm256_loadu_si256((const __m256i *)(src_ptr + 1));
              src_ptr += src_pixels_per_line;
              opointer[curr] = _mm256_avg_epu16(V_V_D1, V_V_D2);
              __m256i V_S_SRC =
                  _mm256_avg_epu16(opointer[curr], opointer[prev]);

              __m256i V_D_DST = _mm256_loadu_si256((const __m256i *)dst_ptr);
              dst_ptr += dst_stride;
              __m256i V_R_SUB = _mm256_sub_epi16(V_S_SRC, V_D_DST);
              __m256i V_R_MAD = _mm256_madd_epi16(V_R_SUB, V_R_SUB);
              sum1 = _mm256_add_epi16(sum1, V_R_SUB);
              sse1 = _mm256_add_epi32(sse1, V_R_MAD);
            }

            __m256i v_sum0 = _mm256_madd_epi16(sum1, one);
            __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
            __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
            __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
            const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
            const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
            __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
            v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
            sum_long += _mm_extract_epi32(v_d, 0);
            sse_long += _mm_extract_epi32(v_d, 1);
          }

          rshift = get_msb(output_height) + get_msb(output_width);
      }

    } else {
      switch (output_width) {
        case 8:
          if (output_height == 4) inc = 2;
          for (j = 0; j < output_height * inc / 8; j++) {
            __m256i sum1 = _mm256_setzero_si256();
            __m256i sse1 = _mm256_setzero_si256();
            for (i = 0; i < 8 / inc; i += 2) {
              if (i == 0 && j == 0) {
                src0[0] = _mm_loadu_si128((const __m128i *)src_ptr);
                src0[1] =
                    _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[2] = _mm_loadu_si128((const __m128i *)src_ptr);
                src0[3] =
                    _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[4] = _mm_loadu_si128((const __m128i *)src_ptr);
                src0[5] =
                    _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
              } else {
                prev = next;
                curr = (next + 2) % 6;
                next = (next + 4) % 6;
                src0[curr] = _mm_loadu_si128((const __m128i *)src_ptr);
                src0[curr + 1] =
                    _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
                src0[next] = _mm_loadu_si128((const __m128i *)src_ptr);
                src0[next + 1] =
                    _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
                src_ptr += 8;
                src_ptr += src_pixels_per_line - output_width;
              }

              src1 = _mm256_insertf128_si256(filter1, src0[prev], 0);
              src[0] = _mm256_insertf128_si256(src1, src0[curr], 1);

              src1 = _mm256_insertf128_si256(filter1, src0[prev + 1], 0);
              src[1] = _mm256_insertf128_si256(src1, src0[curr + 1], 1);

              src1 = _mm256_insertf128_si256(filter1, src0[curr], 0);
              src[2] = _mm256_insertf128_si256(src1, src0[next], 1);

              src1 = _mm256_insertf128_si256(filter1, src0[curr + 1], 0);
              src[3] = _mm256_insertf128_si256(src1, src0[next + 1], 1);

              __m256i V_S_SRC = _mm256_avg_epu16(src[0], src[1]);
              __m256i V_S_SRC1 = _mm256_avg_epu16(src[2], src[3]);

              __m256i V_V_M1 = _mm256_unpacklo_epi16(V_S_SRC, V_S_SRC1);
              __m256i V_V_M2 = _mm256_unpackhi_epi16(V_S_SRC, V_S_SRC1);

              __m256i V_V_MAD1 = _mm256_madd_epi16(V_V_M1, filter2);
              __m256i V_V_MAD2 = _mm256_madd_epi16(V_V_M2, filter2);

              __m256i V_V_S1 =
                  _mm256_srli_epi32(_mm256_add_epi32(V_V_MAD1, rbias), 7);
              __m256i V_V_S2 =
                  _mm256_srli_epi32(_mm256_add_epi32(V_V_MAD2, rbias), 7);

              V_S_SRC = _mm256_packus_epi32(V_V_S1, V_V_S2);

              dst0[0] = _mm_loadu_si128((const __m128i *)dst_ptr);
              dst_ptr += dst_stride;
              dst0[1] = _mm_loadu_si128((const __m128i *)dst_ptr);
              dst_ptr += dst_stride;

              __m256i V_S_D1 = _mm256_castsi128_si256(dst0[0]);
              dst1 = _mm256_insertf128_si256(V_S_D1, dst0[1], 1);

              __m256i V_S_SUB = _mm256_sub_epi16(V_S_SRC, dst1);
              __m256i V_S_MAD = _mm256_madd_epi16(V_S_SUB, V_S_SUB);
              sum1 = _mm256_add_epi16(sum1, V_S_SUB);
              sse1 = _mm256_add_epi32(sse1, V_S_MAD);
            }
            __m256i v_sum00 =
                _mm256_cvtepi16_epi32(_mm256_castsi256_si128(sum1));
            __m256i v_sum01 =
                _mm256_cvtepi16_epi32(_mm256_extracti128_si256(sum1, 1));
            __m256i v_sum0 = _mm256_add_epi32(v_sum00, v_sum01);
            __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
            __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
            __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
            const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
            const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
            __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
            v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
            sum_long += _mm_extract_epi32(v_d, 0);
            sse_long += _mm_extract_epi32(v_d, 1);
          }

          rshift = get_msb(output_height) + 3;

          break;

        default:
          range = output_width / 16;
          if (output_height == 8) inc = 2;
          if (output_height == 4) inc = 4;
          for (j = 0; j < range * output_height * inc / 16; j++) {
            if (j % (output_height * inc / 16) == 0) {
              src_ptr = src_ptr_ref;
              src_ptr_ref += 16;
              dst_ptr = dst_ptr_ref;
              dst_ptr_ref += 16;

              __m256i V_H_D1 = _mm256_loadu_si256((const __m256i *)src_ptr);
              __m256i V_H_D2 =
                  _mm256_loadu_si256((const __m256i *)(src_ptr + 1));
              src_ptr += src_pixels_per_line;
              opointer[0] = _mm256_avg_epu16(V_H_D1, V_H_D2);
              curr = 0;
            }

            __m256i sum1 = _mm256_setzero_si256();
            __m256i sse1 = _mm256_setzero_si256();

            for (i = 0; i < 16 / inc; ++i) {
              prev = curr;
              curr = (curr == 0) ? 1 : 0;
              __m256i V_V_D1 = _mm256_loadu_si256((const __m256i *)src_ptr);
              __m256i V_V_D2 =
                  _mm256_loadu_si256((const __m256i *)(src_ptr + 1));
              src_ptr += src_pixels_per_line;
              opointer[curr] = _mm256_avg_epu16(V_V_D1, V_V_D2);

              __m256i V_S_M1 =
                  _mm256_unpacklo_epi16(opointer[prev], opointer[curr]);
              __m256i V_S_M2 =
                  _mm256_unpackhi_epi16(opointer[prev], opointer[curr]);

              __m256i V_S_MAD1 = _mm256_madd_epi16(V_S_M1, filter2);
              __m256i V_S_MAD2 = _mm256_madd_epi16(V_S_M2, filter2);

              __m256i V_S_S1 =
                  _mm256_srli_epi32(_mm256_add_epi32(V_S_MAD1, rbias), 7);
              __m256i V_S_S2 =
                  _mm256_srli_epi32(_mm256_add_epi32(V_S_MAD2, rbias), 7);

              __m256i V_S_SRC = _mm256_packus_epi32(V_S_S1, V_S_S2);

              __m256i V_D_DST = _mm256_loadu_si256((const __m256i *)dst_ptr);
              dst_ptr += dst_stride;

              __m256i V_R_SUB = _mm256_sub_epi16(V_S_SRC, V_D_DST);
              __m256i V_R_MAD = _mm256_madd_epi16(V_R_SUB, V_R_SUB);

              sum1 = _mm256_add_epi16(sum1, V_R_SUB);
              sse1 = _mm256_add_epi32(sse1, V_R_MAD);
            }

            __m256i v_sum0 = _mm256_madd_epi16(sum1, one);
            __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
            __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
            __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
            const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
            const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
            __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
            v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
            sum_long += _mm_extract_epi32(v_d, 0);
            sse_long += _mm_extract_epi32(v_d, 1);
          }

          rshift = get_msb(output_height) + get_msb(output_width);
      }
    }
  } else if (yoffset == 0) {
    switch (output_width) {
      case 8:
        if (output_height == 4) inc = 2;
        for (j = 0; j < output_height * inc / 8; j++) {
          __m256i sum1 = _mm256_setzero_si256();
          __m256i sse1 = _mm256_setzero_si256();
          for (i = 0; i < 8 / inc; i += 2) {
            src0[0] = _mm_loadu_si128((const __m128i *)src_ptr);
            src0[1] = _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
            src_ptr += 8;
            src_ptr += src_pixels_per_line - output_width;
            src0[2] = _mm_loadu_si128((const __m128i *)src_ptr);
            src0[3] = _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
            src_ptr += 8;
            src_ptr += src_pixels_per_line - output_width;

            src1 = _mm256_insertf128_si256(filter1, src0[0], 0);
            src[0] = _mm256_insertf128_si256(src1, src0[2], 1);

            src1 = _mm256_insertf128_si256(filter1, src0[1], 0);
            src[1] = _mm256_insertf128_si256(src1, src0[3], 1);

            __m256i V_H_M1 = _mm256_unpacklo_epi16(src[0], src[1]);
            __m256i V_H_M2 = _mm256_unpackhi_epi16(src[0], src[1]);

            __m256i V_H_MAD1 = _mm256_madd_epi16(V_H_M1, filter1);
            __m256i V_H_MAD2 = _mm256_madd_epi16(V_H_M2, filter1);

            __m256i V_H_S1 =
                _mm256_srli_epi32(_mm256_add_epi32(V_H_MAD1, rbias), 7);
            __m256i V_H_S2 =
                _mm256_srli_epi32(_mm256_add_epi32(V_H_MAD2, rbias), 7);

            __m256i V_V_D1 = _mm256_packus_epi32(V_H_S1, V_H_S2);

            dst0[0] = _mm_loadu_si128((const __m128i *)dst_ptr);
            dst_ptr += dst_stride;
            dst0[1] = _mm_loadu_si128((const __m128i *)dst_ptr);
            dst_ptr += dst_stride;

            __m256i V_S_D1 = _mm256_castsi128_si256(dst0[0]);
            dst1 = _mm256_insertf128_si256(V_S_D1, dst0[1], 1);

            __m256i V_S_SUB = _mm256_sub_epi16(V_V_D1, dst1);
            __m256i V_S_MAD = _mm256_madd_epi16(V_S_SUB, V_S_SUB);
            sum1 = _mm256_add_epi16(sum1, V_S_SUB);
            sse1 = _mm256_add_epi32(sse1, V_S_MAD);
          }
          __m256i v_sum00 = _mm256_cvtepi16_epi32(_mm256_castsi256_si128(sum1));
          __m256i v_sum01 =
              _mm256_cvtepi16_epi32(_mm256_extracti128_si256(sum1, 1));
          __m256i v_sum0 = _mm256_add_epi32(v_sum00, v_sum01);
          __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
          __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
          __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
          const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
          const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
          __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
          v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
          sum_long += _mm_extract_epi32(v_d, 0);
          sse_long += _mm_extract_epi32(v_d, 1);
        }

        rshift = get_msb(output_height) + 3;

        break;

      default:
        range = output_width / 16;
        if (output_height == 8) inc = 2;
        if (output_height == 4) inc = 4;
        for (j = 0; j < range * output_height * inc / 16; j++) {
          if (j % (output_height * inc / 16) == 0) {
            src_ptr = src_ptr_ref;
            src_ptr_ref += 16;
            dst_ptr = dst_ptr_ref;
            dst_ptr_ref += 16;

            curr = 0;
          }

          __m256i sum1 = _mm256_setzero_si256();
          __m256i sse1 = _mm256_setzero_si256();

          for (i = 0; i < 16 / inc; ++i) {
            __m256i V_V_D1 = _mm256_loadu_si256((const __m256i *)src_ptr);
            __m256i V_V_D2 = _mm256_loadu_si256((const __m256i *)(src_ptr + 1));
            src_ptr += src_pixels_per_line;
            __m256i V_V_M1 = _mm256_unpacklo_epi16(V_V_D1, V_V_D2);
            __m256i V_V_M2 = _mm256_unpackhi_epi16(V_V_D1, V_V_D2);
            __m256i V_V_MAD1 = _mm256_madd_epi16(V_V_M1, filter1);
            __m256i V_V_MAD2 = _mm256_madd_epi16(V_V_M2, filter1);
            __m256i V_V_S1 =
                _mm256_srli_epi32(_mm256_add_epi32(V_V_MAD1, rbias), 7);
            __m256i V_V_S2 =
                _mm256_srli_epi32(_mm256_add_epi32(V_V_MAD2, rbias), 7);
            opointer[curr] = _mm256_packus_epi32(V_V_S1, V_V_S2);

            __m256i V_D_DST = _mm256_loadu_si256((const __m256i *)dst_ptr);
            dst_ptr += dst_stride;
            __m256i V_R_SUB = _mm256_sub_epi16(opointer[curr], V_D_DST);
            __m256i V_R_MAD = _mm256_madd_epi16(V_R_SUB, V_R_SUB);

            sum1 = _mm256_add_epi16(sum1, V_R_SUB);
            sse1 = _mm256_add_epi32(sse1, V_R_MAD);
          }

          __m256i v_sum0 = _mm256_madd_epi16(sum1, one);
          __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
          __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
          __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
          const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
          const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
          __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
          v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
          sum_long += _mm_extract_epi32(v_d, 0);
          sse_long += _mm_extract_epi32(v_d, 1);
        }

        rshift = get_msb(output_height) + get_msb(output_width);
    }
  } else if (yoffset == 8) {
    switch (output_width) {
      case 8:
        if (output_height == 4) inc = 2;
        for (j = 0; j < output_height * inc / 8; j++) {
          __m256i sum1 = _mm256_setzero_si256();
          __m256i sse1 = _mm256_setzero_si256();
          for (i = 0; i < 8 / inc; i += 2) {
            if (i == 0 && j == 0) {
              src0[0] = _mm_loadu_si128((const __m128i *)src_ptr);
              src0[1] =
                  _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
              src_ptr += 8;
              src_ptr += src_pixels_per_line - output_width;
              src0[2] = _mm_loadu_si128((const __m128i *)src_ptr);
              src0[3] =
                  _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
              src_ptr += 8;
              src_ptr += src_pixels_per_line - output_width;
              src0[4] = _mm_loadu_si128((const __m128i *)src_ptr);
              src0[5] =
                  _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
              src_ptr += 8;
              src_ptr += src_pixels_per_line - output_width;
            } else {
              prev = next;
              curr = (next + 2) % 6;
              next = (next + 4) % 6;
              src0[curr] = _mm_loadu_si128((const __m128i *)src_ptr);
              src0[curr + 1] =
                  _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
              src_ptr += 8;
              src_ptr += src_pixels_per_line - output_width;
              src0[next] = _mm_loadu_si128((const __m128i *)src_ptr);
              src0[next + 1] =
                  _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
              src_ptr += 8;
              src_ptr += src_pixels_per_line - output_width;
            }

            src1 = _mm256_insertf128_si256(filter1, src0[prev], 0);
            src[0] = _mm256_insertf128_si256(src1, src0[curr], 1);

            src1 = _mm256_insertf128_si256(filter1, src0[prev + 1], 0);
            src[1] = _mm256_insertf128_si256(src1, src0[curr + 1], 1);

            src1 = _mm256_insertf128_si256(filter1, src0[curr], 0);
            src[2] = _mm256_insertf128_si256(src1, src0[next], 1);

            src1 = _mm256_insertf128_si256(filter1, src0[curr + 1], 0);
            src[3] = _mm256_insertf128_si256(src1, src0[next + 1], 1);

            __m256i V_H_M1 = _mm256_unpacklo_epi16(src[0], src[1]);
            __m256i V_H_M2 = _mm256_unpackhi_epi16(src[0], src[1]);

            __m256i V_H_M3 = _mm256_unpacklo_epi16(src[2], src[3]);
            __m256i V_H_M4 = _mm256_unpackhi_epi16(src[2], src[3]);

            __m256i V_H_MAD1 = _mm256_madd_epi16(V_H_M1, filter1);
            __m256i V_H_MAD2 = _mm256_madd_epi16(V_H_M2, filter1);

            __m256i V_H_MAD3 = _mm256_madd_epi16(V_H_M3, filter1);
            __m256i V_H_MAD4 = _mm256_madd_epi16(V_H_M4, filter1);

            __m256i V_H_S1 =
                _mm256_srli_epi32(_mm256_add_epi32(V_H_MAD1, rbias), 7);
            __m256i V_H_S2 =
                _mm256_srli_epi32(_mm256_add_epi32(V_H_MAD2, rbias), 7);

            __m256i V_H_S3 =
                _mm256_srli_epi32(_mm256_add_epi32(V_H_MAD3, rbias), 7);
            __m256i V_H_S4 =
                _mm256_srli_epi32(_mm256_add_epi32(V_H_MAD4, rbias), 7);

            __m256i V_V_D1 = _mm256_packus_epi32(V_H_S1, V_H_S2);
            __m256i V_V_D2 = _mm256_packus_epi32(V_H_S3, V_H_S4);

            __m256i V_S_SRC = _mm256_avg_epu16(V_V_D1, V_V_D2);

            dst0[0] = _mm_loadu_si128((const __m128i *)dst_ptr);
            dst_ptr += dst_stride;
            dst0[1] = _mm_loadu_si128((const __m128i *)dst_ptr);
            dst_ptr += dst_stride;

            __m256i V_S_D1 = _mm256_castsi128_si256(dst0[0]);
            dst1 = _mm256_insertf128_si256(V_S_D1, dst0[1], 1);

            __m256i V_S_SUB = _mm256_sub_epi16(V_S_SRC, dst1);
            __m256i V_S_MAD = _mm256_madd_epi16(V_S_SUB, V_S_SUB);
            sum1 = _mm256_add_epi16(sum1, V_S_SUB);
            sse1 = _mm256_add_epi32(sse1, V_S_MAD);
          }
          __m256i v_sum00 = _mm256_cvtepi16_epi32(_mm256_castsi256_si128(sum1));
          __m256i v_sum01 =
              _mm256_cvtepi16_epi32(_mm256_extracti128_si256(sum1, 1));
          __m256i v_sum0 = _mm256_add_epi32(v_sum00, v_sum01);
          __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
          __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
          __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
          const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
          const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
          __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
          v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
          sum_long += _mm_extract_epi32(v_d, 0);
          sse_long += _mm_extract_epi32(v_d, 1);
        }

        rshift = get_msb(output_height) + 3;

        break;

      default:
        range = output_width / 16;
        if (output_height == 8) inc = 2;
        if (output_height == 4) inc = 4;
        for (j = 0; j < range * output_height * inc / 16; j++) {
          if (j % (output_height * inc / 16) == 0) {
            src_ptr = src_ptr_ref;
            src_ptr_ref += 16;
            dst_ptr = dst_ptr_ref;
            dst_ptr_ref += 16;

            __m256i V_H_D1 = _mm256_loadu_si256((const __m256i *)src_ptr);
            __m256i V_H_D2 = _mm256_loadu_si256((const __m256i *)(src_ptr + 1));
            src_ptr += src_pixels_per_line;

            __m256i V_H_M1 = _mm256_unpacklo_epi16(V_H_D1, V_H_D2);
            __m256i V_H_M2 = _mm256_unpackhi_epi16(V_H_D1, V_H_D2);

            __m256i V_H_MAD1 = _mm256_madd_epi16(V_H_M1, filter1);
            __m256i V_H_MAD2 = _mm256_madd_epi16(V_H_M2, filter1);

            __m256i V_H_S1 =
                _mm256_srli_epi32(_mm256_add_epi32(V_H_MAD1, rbias), 7);
            __m256i V_H_S2 =
                _mm256_srli_epi32(_mm256_add_epi32(V_H_MAD2, rbias), 7);

            opointer[0] = _mm256_packus_epi32(V_H_S1, V_H_S2);

            curr = 0;
          }

          __m256i sum1 = _mm256_setzero_si256();
          __m256i sse1 = _mm256_setzero_si256();

          for (i = 0; i < 16 / inc; ++i) {
            prev = curr;
            curr = (curr == 0) ? 1 : 0;
            __m256i V_V_D1 = _mm256_loadu_si256((const __m256i *)src_ptr);
            __m256i V_V_D2 = _mm256_loadu_si256((const __m256i *)(src_ptr + 1));
            src_ptr += src_pixels_per_line;
            __m256i V_V_M1 = _mm256_unpacklo_epi16(V_V_D1, V_V_D2);
            __m256i V_V_M2 = _mm256_unpackhi_epi16(V_V_D1, V_V_D2);
            __m256i V_V_MAD1 = _mm256_madd_epi16(V_V_M1, filter1);
            __m256i V_V_MAD2 = _mm256_madd_epi16(V_V_M2, filter1);
            __m256i V_V_S1 =
                _mm256_srli_epi32(_mm256_add_epi32(V_V_MAD1, rbias), 7);
            __m256i V_V_S2 =
                _mm256_srli_epi32(_mm256_add_epi32(V_V_MAD2, rbias), 7);
            opointer[curr] = _mm256_packus_epi32(V_V_S1, V_V_S2);

            __m256i V_S_SRC = _mm256_avg_epu16(opointer[prev], opointer[curr]);

            __m256i V_D_DST = _mm256_loadu_si256((const __m256i *)dst_ptr);
            dst_ptr += dst_stride;

            __m256i V_R_SUB = _mm256_sub_epi16(V_S_SRC, V_D_DST);
            __m256i V_R_MAD = _mm256_madd_epi16(V_R_SUB, V_R_SUB);

            sum1 = _mm256_add_epi16(sum1, V_R_SUB);
            sse1 = _mm256_add_epi32(sse1, V_R_MAD);
          }

          __m256i v_sum0 = _mm256_madd_epi16(sum1, one);
          __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
          __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
          __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
          const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
          const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
          __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
          v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
          sum_long += _mm_extract_epi32(v_d, 0);
          sse_long += _mm_extract_epi32(v_d, 1);
        }

        rshift = get_msb(output_height) + get_msb(output_width);
    }
  } else {
    switch (output_width) {
      case 8:
        if (output_height == 4) inc = 2;
        for (j = 0; j < output_height * inc / 8; j++) {
          __m256i sum1 = _mm256_setzero_si256();
          __m256i sse1 = _mm256_setzero_si256();
          for (i = 0; i < 8 / inc; i += 2) {
            if (i == 0 && j == 0) {
              src0[0] = _mm_loadu_si128((const __m128i *)src_ptr);
              src0[1] =
                  _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
              src_ptr += 8;
              src_ptr += src_pixels_per_line - output_width;
              src0[2] = _mm_loadu_si128((const __m128i *)src_ptr);
              src0[3] =
                  _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
              src_ptr += 8;
              src_ptr += src_pixels_per_line - output_width;
              src0[4] = _mm_loadu_si128((const __m128i *)src_ptr);
              src0[5] =
                  _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
              src_ptr += 8;
              src_ptr += src_pixels_per_line - output_width;
            } else {
              prev = next;
              curr = (next + 2) % 6;
              next = (next + 4) % 6;
              src0[curr] = _mm_loadu_si128((const __m128i *)src_ptr);
              src0[curr + 1] =
                  _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
              src_ptr += 8;
              src_ptr += src_pixels_per_line - output_width;
              src0[next] = _mm_loadu_si128((const __m128i *)src_ptr);
              src0[next + 1] =
                  _mm_loadu_si128((const __m128i *)(src_ptr + pixel_step));
              src_ptr += 8;
              src_ptr += src_pixels_per_line - output_width;
            }

            src1 = _mm256_insertf128_si256(filter1, src0[prev], 0);
            src[0] = _mm256_insertf128_si256(src1, src0[curr], 1);

            src1 = _mm256_insertf128_si256(filter1, src0[prev + 1], 0);
            src[1] = _mm256_insertf128_si256(src1, src0[curr + 1], 1);

            src1 = _mm256_insertf128_si256(filter1, src0[curr], 0);
            src[2] = _mm256_insertf128_si256(src1, src0[next], 1);

            src1 = _mm256_insertf128_si256(filter1, src0[curr + 1], 0);
            src[3] = _mm256_insertf128_si256(src1, src0[next + 1], 1);

            __m256i V_H_M1 = _mm256_unpacklo_epi16(src[0], src[1]);
            __m256i V_H_M2 = _mm256_unpackhi_epi16(src[0], src[1]);

            __m256i V_H_M3 = _mm256_unpacklo_epi16(src[2], src[3]);
            __m256i V_H_M4 = _mm256_unpackhi_epi16(src[2], src[3]);

            __m256i V_H_MAD1 = _mm256_madd_epi16(V_H_M1, filter1);
            __m256i V_H_MAD2 = _mm256_madd_epi16(V_H_M2, filter1);

            __m256i V_H_MAD3 = _mm256_madd_epi16(V_H_M3, filter1);
            __m256i V_H_MAD4 = _mm256_madd_epi16(V_H_M4, filter1);

            __m256i V_H_S1 =
                _mm256_srli_epi32(_mm256_add_epi32(V_H_MAD1, rbias), 7);
            __m256i V_H_S2 =
                _mm256_srli_epi32(_mm256_add_epi32(V_H_MAD2, rbias), 7);

            __m256i V_H_S3 =
                _mm256_srli_epi32(_mm256_add_epi32(V_H_MAD3, rbias), 7);
            __m256i V_H_S4 =
                _mm256_srli_epi32(_mm256_add_epi32(V_H_MAD4, rbias), 7);

            __m256i V_V_D1 = _mm256_packus_epi32(V_H_S1, V_H_S2);
            __m256i V_V_D2 = _mm256_packus_epi32(V_H_S3, V_H_S4);

            __m256i V_V_M1 = _mm256_unpacklo_epi16(V_V_D1, V_V_D2);
            __m256i V_V_M2 = _mm256_unpackhi_epi16(V_V_D1, V_V_D2);

            __m256i V_V_MAD1 = _mm256_madd_epi16(V_V_M1, filter2);
            __m256i V_V_MAD2 = _mm256_madd_epi16(V_V_M2, filter2);

            __m256i V_V_S1 =
                _mm256_srli_epi32(_mm256_add_epi32(V_V_MAD1, rbias), 7);
            __m256i V_V_S2 =
                _mm256_srli_epi32(_mm256_add_epi32(V_V_MAD2, rbias), 7);

            __m256i V_S_SRC = _mm256_packus_epi32(V_V_S1, V_V_S2);

            dst0[0] = _mm_loadu_si128((const __m128i *)dst_ptr);
            dst_ptr += dst_stride;
            dst0[1] = _mm_loadu_si128((const __m128i *)dst_ptr);
            dst_ptr += dst_stride;

            __m256i V_S_D1 = _mm256_castsi128_si256(dst0[0]);
            dst1 = _mm256_insertf128_si256(V_S_D1, dst0[1], 1);

            __m256i V_S_SUB = _mm256_sub_epi16(V_S_SRC, dst1);
            __m256i V_S_MAD = _mm256_madd_epi16(V_S_SUB, V_S_SUB);
            sum1 = _mm256_add_epi16(sum1, V_S_SUB);
            sse1 = _mm256_add_epi32(sse1, V_S_MAD);
          }
          __m256i v_sum00 = _mm256_cvtepi16_epi32(_mm256_castsi256_si128(sum1));
          __m256i v_sum01 =
              _mm256_cvtepi16_epi32(_mm256_extracti128_si256(sum1, 1));
          __m256i v_sum0 = _mm256_add_epi32(v_sum00, v_sum01);
          __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
          __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
          __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
          const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
          const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
          __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
          v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
          sum_long += _mm_extract_epi32(v_d, 0);
          sse_long += _mm_extract_epi32(v_d, 1);
        }

        rshift = get_msb(output_height) + 3;

        break;

      default:
        range = output_width / 16;
        if (output_height == 8) inc = 2;
        if (output_height == 4) inc = 4;
        unsigned int nloop = 16 / inc;
        for (j = 0; j < range * output_height * inc / 16; j++) {
          if (j % (output_height * inc / 16) == 0) {
            src_ptr = src_ptr_ref;
            src_ptr_ref += 16;
            dst_ptr = dst_ptr_ref;
            dst_ptr_ref += 16;

            __m256i V_H_D1 = _mm256_loadu_si256((const __m256i *)src_ptr);
            __m256i V_H_D2 = _mm256_loadu_si256((const __m256i *)(src_ptr + 1));
            src_ptr += src_pixels_per_line;

            __m256i V_H_M1 = _mm256_unpacklo_epi16(V_H_D1, V_H_D2);
            __m256i V_H_M2 = _mm256_unpackhi_epi16(V_H_D1, V_H_D2);

            __m256i V_H_MAD1 = _mm256_madd_epi16(V_H_M1, filter1);
            __m256i V_H_MAD2 = _mm256_madd_epi16(V_H_M2, filter1);

            __m256i V_H_S1 =
                _mm256_srli_epi32(_mm256_add_epi32(V_H_MAD1, rbias), 7);
            __m256i V_H_S2 =
                _mm256_srli_epi32(_mm256_add_epi32(V_H_MAD2, rbias), 7);

            opointer[0] = _mm256_packus_epi32(V_H_S1, V_H_S2);

            curr = 0;
          }

          __m256i sum1 = _mm256_setzero_si256();
          __m256i sse1 = _mm256_setzero_si256();

          for (i = 0; i < nloop; ++i) {
            prev = curr;
            curr = !curr;
            __m256i V_V_D1 = _mm256_loadu_si256((const __m256i *)src_ptr);
            __m256i V_V_D2 = _mm256_loadu_si256((const __m256i *)(src_ptr + 1));
            src_ptr += src_pixels_per_line;
            __m256i V_V_M1 = _mm256_unpacklo_epi16(V_V_D1, V_V_D2);
            __m256i V_V_M2 = _mm256_unpackhi_epi16(V_V_D1, V_V_D2);
            __m256i V_V_MAD1 = _mm256_madd_epi16(V_V_M1, filter1);
            __m256i V_V_MAD2 = _mm256_madd_epi16(V_V_M2, filter1);
            __m256i V_V_S1 =
                _mm256_srli_epi32(_mm256_add_epi32(V_V_MAD1, rbias), 7);
            __m256i V_V_S2 =
                _mm256_srli_epi32(_mm256_add_epi32(V_V_MAD2, rbias), 7);
            opointer[curr] = _mm256_packus_epi32(V_V_S1, V_V_S2);

            __m256i V_S_M1 =
                _mm256_unpacklo_epi16(opointer[prev], opointer[curr]);
            __m256i V_S_M2 =
                _mm256_unpackhi_epi16(opointer[prev], opointer[curr]);

            __m256i V_S_MAD1 = _mm256_madd_epi16(V_S_M1, filter2);
            __m256i V_S_MAD2 = _mm256_madd_epi16(V_S_M2, filter2);

            __m256i V_S_S1 =
                _mm256_srli_epi32(_mm256_add_epi32(V_S_MAD1, rbias), 7);
            __m256i V_S_S2 =
                _mm256_srli_epi32(_mm256_add_epi32(V_S_MAD2, rbias), 7);

            __m256i V_S_SRC = _mm256_packus_epi32(V_S_S1, V_S_S2);

            __m256i V_D_DST = _mm256_loadu_si256((const __m256i *)dst_ptr);
            dst_ptr += dst_stride;

            __m256i V_R_SUB = _mm256_sub_epi16(V_S_SRC, V_D_DST);
            __m256i V_R_MAD = _mm256_madd_epi16(V_R_SUB, V_R_SUB);

            sum1 = _mm256_add_epi16(sum1, V_R_SUB);
            sse1 = _mm256_add_epi32(sse1, V_R_MAD);
          }

          __m256i v_sum0 = _mm256_madd_epi16(sum1, one);
          __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, sse1);
          __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, sse1);
          __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
          const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
          const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
          __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
          v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
          sum_long += _mm_extract_epi32(v_d, 0);
          sse_long += _mm_extract_epi32(v_d, 1);
        }

        rshift = get_msb(output_height) + get_msb(output_width);
    }
  }

  *sse = (uint32_t)ROUND_POWER_OF_TWO(sse_long, 4);
  int sum = (int)ROUND_POWER_OF_TWO(sum_long, 2);

  int32_t var = *sse - (uint32_t)(((int64_t)sum * sum) >> rshift);

  return (var > 0) ? var : 0;
}

void aom_highbd_calc8x8var_avx2(const uint16_t *src, int src_stride,
                                const uint16_t *ref, int ref_stride,
                                uint32_t *sse, int *sum) {
  __m256i v_sum_d = _mm256_setzero_si256();
  __m256i v_sse_d = _mm256_setzero_si256();
  for (int i = 0; i < 8; i += 2) {
    const __m128i v_p_a0 = _mm_loadu_si128((const __m128i *)src);
    const __m128i v_p_a1 = _mm_loadu_si128((const __m128i *)(src + src_stride));
    const __m128i v_p_b0 = _mm_loadu_si128((const __m128i *)ref);
    const __m128i v_p_b1 = _mm_loadu_si128((const __m128i *)(ref + ref_stride));
    __m256i v_p_a = _mm256_castsi128_si256(v_p_a0);
    __m256i v_p_b = _mm256_castsi128_si256(v_p_b0);
    v_p_a = _mm256_inserti128_si256(v_p_a, v_p_a1, 1);
    v_p_b = _mm256_inserti128_si256(v_p_b, v_p_b1, 1);
    const __m256i v_diff = _mm256_sub_epi16(v_p_a, v_p_b);
    const __m256i v_sqrdiff = _mm256_madd_epi16(v_diff, v_diff);
    v_sum_d = _mm256_add_epi16(v_sum_d, v_diff);
    v_sse_d = _mm256_add_epi32(v_sse_d, v_sqrdiff);
    src += src_stride * 2;
    ref += ref_stride * 2;
  }
  __m256i v_sum00 = _mm256_cvtepi16_epi32(_mm256_castsi256_si128(v_sum_d));
  __m256i v_sum01 = _mm256_cvtepi16_epi32(_mm256_extracti128_si256(v_sum_d, 1));
  __m256i v_sum0 = _mm256_add_epi32(v_sum00, v_sum01);
  __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, v_sse_d);
  __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, v_sse_d);
  __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
  const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
  const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
  __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
  v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
  *sum = _mm_extract_epi32(v_d, 0);
  *sse = _mm_extract_epi32(v_d, 1);
}

void aom_highbd_calc16x16var_avx2(const uint16_t *src, int src_stride,
                                  const uint16_t *ref, int ref_stride,
                                  uint32_t *sse, int *sum) {
  __m256i v_sum_d = _mm256_setzero_si256();
  __m256i v_sse_d = _mm256_setzero_si256();
  const __m256i one = _mm256_set1_epi16(1);
  for (int i = 0; i < 16; ++i) {
    const __m256i v_p_a = _mm256_loadu_si256((const __m256i *)src);
    const __m256i v_p_b = _mm256_loadu_si256((const __m256i *)ref);
    const __m256i v_diff = _mm256_sub_epi16(v_p_a, v_p_b);
    const __m256i v_sqrdiff = _mm256_madd_epi16(v_diff, v_diff);
    v_sum_d = _mm256_add_epi16(v_sum_d, v_diff);
    v_sse_d = _mm256_add_epi32(v_sse_d, v_sqrdiff);
    src += src_stride;
    ref += ref_stride;
  }
  __m256i v_sum0 = _mm256_madd_epi16(v_sum_d, one);
  __m256i v_d_l = _mm256_unpacklo_epi32(v_sum0, v_sse_d);
  __m256i v_d_h = _mm256_unpackhi_epi32(v_sum0, v_sse_d);
  __m256i v_d_lh = _mm256_add_epi32(v_d_l, v_d_h);
  const __m128i v_d0_d = _mm256_castsi256_si128(v_d_lh);
  const __m128i v_d1_d = _mm256_extracti128_si256(v_d_lh, 1);
  __m128i v_d = _mm_add_epi32(v_d0_d, v_d1_d);
  v_d = _mm_add_epi32(v_d, _mm_srli_si128(v_d, 8));
  *sum = _mm_extract_epi32(v_d, 0);
  *sse = _mm_extract_epi32(v_d, 1);
}

static void highbd_10_variance_avx2(const uint16_t *src, int src_stride,
                                    const uint16_t *ref, int ref_stride, int w,
                                    int h, uint32_t *sse, int *sum,
                                    high_variance_fn_t var_fn, int block_size) {
  int i, j;
  uint64_t sse_long = 0;
  int32_t sum_long = 0;

  for (i = 0; i < h; i += block_size) {
    for (j = 0; j < w; j += block_size) {
      unsigned int sse0;
      int sum0;
      var_fn(src + src_stride * i + j, src_stride, ref + ref_stride * i + j,
             ref_stride, &sse0, &sum0);
      sse_long += sse0;
      sum_long += sum0;
    }
  }
  *sum = ROUND_POWER_OF_TWO(sum_long, 2);
  *sse = (uint32_t)ROUND_POWER_OF_TWO(sse_long, 4);
}

#define VAR_FN(w, h, block_size, shift)                                    \
  uint32_t aom_highbd_10_variance##w##x##h##_avx2(                         \
      const uint8_t *src8, int src_stride, const uint8_t *ref8,            \
      int ref_stride, uint32_t *sse) {                                     \
    int sum;                                                               \
    int64_t var;                                                           \
    uint16_t *src = CONVERT_TO_SHORTPTR(src8);                             \
    uint16_t *ref = CONVERT_TO_SHORTPTR(ref8);                             \
    highbd_10_variance_avx2(                                               \
        src, src_stride, ref, ref_stride, w, h, sse, &sum,                 \
        aom_highbd_calc##block_size##x##block_size##var_avx2, block_size); \
    var = (int64_t)(*sse) - (((int64_t)sum * sum) >> shift);               \
    return (var >= 0) ? (uint32_t)var : 0;                                 \
  }

VAR_FN(128, 128, 16, 14);
VAR_FN(128, 64, 16, 13);
VAR_FN(64, 128, 16, 13);
VAR_FN(64, 64, 16, 12);
VAR_FN(64, 32, 16, 11);
VAR_FN(32, 64, 16, 11);
VAR_FN(32, 32, 16, 10);
VAR_FN(32, 16, 16, 9);
VAR_FN(16, 32, 16, 9);
VAR_FN(16, 16, 16, 8);
VAR_FN(16, 8, 8, 7);
VAR_FN(16, 4, 16, 6);
VAR_FN(8, 32, 8, 8);
VAR_FN(32, 8, 8, 8);
VAR_FN(16, 64, 16, 10);
VAR_FN(64, 16, 16, 10);
VAR_FN(8, 16, 8, 7);
VAR_FN(8, 8, 8, 6);

#undef VAR_FN

#define HIGHBD_SUBPIX_VAR(W, H)                                            \
  uint32_t aom_highbd_10_sub_pixel_variance##W##x##H##_avx2(               \
      const uint8_t *src, int src_stride, int xoffset, int yoffset,        \
      const uint8_t *dst, int dst_stride, uint32_t *sse) {                 \
    return aom_highbd_var_filter_block2d_bil_avx2(                         \
        src, src_stride, 1, H, W, xoffset, yoffset, dst, dst_stride, sse); \
  }

HIGHBD_SUBPIX_VAR(128, 128);
HIGHBD_SUBPIX_VAR(128, 64);
HIGHBD_SUBPIX_VAR(64, 128);
HIGHBD_SUBPIX_VAR(64, 64);
HIGHBD_SUBPIX_VAR(64, 32);
HIGHBD_SUBPIX_VAR(32, 64);
HIGHBD_SUBPIX_VAR(32, 32);
HIGHBD_SUBPIX_VAR(32, 16);
HIGHBD_SUBPIX_VAR(16, 32);
HIGHBD_SUBPIX_VAR(16, 16);
HIGHBD_SUBPIX_VAR(16, 8);
#undef HIGHBD_SUBPIX_VAR

uint64_t aom_mse_4xh_16bit_highbd_avx2(uint16_t *dst, int dstride,
                                       uint16_t *src, int sstride, int h) {
  uint64_t sum = 0;
  __m128i reg0_4x16, reg1_4x16, reg2_4x16, reg3_4x16;
  __m256i src0_8x16, src1_8x16, src_16x16;
  __m256i dst0_8x16, dst1_8x16, dst_16x16;
  __m256i res0_4x64, res1_4x64, res2_4x64, res3_4x64;
  __m256i sub_result;
  const __m256i zeros = _mm256_broadcastsi128_si256(_mm_setzero_si128());
  __m256i square_result = _mm256_broadcastsi128_si256(_mm_setzero_si128());
  for (int i = 0; i < h; i += 4) {
    reg0_4x16 = _mm_loadl_epi64((__m128i const *)(&dst[(i + 0) * dstride]));
    reg1_4x16 = _mm_loadl_epi64((__m128i const *)(&dst[(i + 1) * dstride]));
    reg2_4x16 = _mm_loadl_epi64((__m128i const *)(&dst[(i + 2) * dstride]));
    reg3_4x16 = _mm_loadl_epi64((__m128i const *)(&dst[(i + 3) * dstride]));
    dst0_8x16 =
        _mm256_castsi128_si256(_mm_unpacklo_epi64(reg0_4x16, reg1_4x16));
    dst1_8x16 =
        _mm256_castsi128_si256(_mm_unpacklo_epi64(reg2_4x16, reg3_4x16));
    dst_16x16 = _mm256_permute2x128_si256(dst0_8x16, dst1_8x16, 0x20);

    reg0_4x16 = _mm_loadl_epi64((__m128i const *)(&src[(i + 0) * sstride]));
    reg1_4x16 = _mm_loadl_epi64((__m128i const *)(&src[(i + 1) * sstride]));
    reg2_4x16 = _mm_loadl_epi64((__m128i const *)(&src[(i + 2) * sstride]));
    reg3_4x16 = _mm_loadl_epi64((__m128i const *)(&src[(i + 3) * sstride]));
    src0_8x16 =
        _mm256_castsi128_si256(_mm_unpacklo_epi64(reg0_4x16, reg1_4x16));
    src1_8x16 =
        _mm256_castsi128_si256(_mm_unpacklo_epi64(reg2_4x16, reg3_4x16));
    src_16x16 = _mm256_permute2x128_si256(src0_8x16, src1_8x16, 0x20);

    sub_result = _mm256_abs_epi16(_mm256_sub_epi16(src_16x16, dst_16x16));

    src_16x16 = _mm256_unpacklo_epi16(sub_result, zeros);
    dst_16x16 = _mm256_unpackhi_epi16(sub_result, zeros);

    src_16x16 = _mm256_madd_epi16(src_16x16, src_16x16);
    dst_16x16 = _mm256_madd_epi16(dst_16x16, dst_16x16);

    res0_4x64 = _mm256_unpacklo_epi32(src_16x16, zeros);
    res1_4x64 = _mm256_unpackhi_epi32(src_16x16, zeros);
    res2_4x64 = _mm256_unpacklo_epi32(dst_16x16, zeros);
    res3_4x64 = _mm256_unpackhi_epi32(dst_16x16, zeros);

    square_result = _mm256_add_epi64(
        square_result,
        _mm256_add_epi64(
            _mm256_add_epi64(_mm256_add_epi64(res0_4x64, res1_4x64), res2_4x64),
            res3_4x64));
  }
  const __m128i sum_2x64 =
      _mm_add_epi64(_mm256_castsi256_si128(square_result),
                    _mm256_extracti128_si256(square_result, 1));
  const __m128i sum_1x64 = _mm_add_epi64(sum_2x64, _mm_srli_si128(sum_2x64, 8));
  xx_storel_64(&sum, sum_1x64);
  return sum;
}

uint64_t aom_mse_8xh_16bit_highbd_avx2(uint16_t *dst, int dstride,
                                       uint16_t *src, int sstride, int h) {
  uint64_t sum = 0;
  __m256i src0_8x16, src1_8x16, src_16x16;
  __m256i dst0_8x16, dst1_8x16, dst_16x16;
  __m256i res0_4x64, res1_4x64, res2_4x64, res3_4x64;
  __m256i sub_result;
  const __m256i zeros = _mm256_broadcastsi128_si256(_mm_setzero_si128());
  __m256i square_result = _mm256_broadcastsi128_si256(_mm_setzero_si128());

  for (int i = 0; i < h; i += 2) {
    dst0_8x16 =
        _mm256_castsi128_si256(_mm_loadu_si128((__m128i *)&dst[i * dstride]));
    dst1_8x16 = _mm256_castsi128_si256(
        _mm_loadu_si128((__m128i *)&dst[(i + 1) * dstride]));
    dst_16x16 = _mm256_permute2x128_si256(dst0_8x16, dst1_8x16, 0x20);

    src0_8x16 =
        _mm256_castsi128_si256(_mm_loadu_si128((__m128i *)&src[i * sstride]));
    src1_8x16 = _mm256_castsi128_si256(
        _mm_loadu_si128((__m128i *)&src[(i + 1) * sstride]));
    src_16x16 = _mm256_permute2x128_si256(src0_8x16, src1_8x16, 0x20);

    sub_result = _mm256_abs_epi16(_mm256_sub_epi16(src_16x16, dst_16x16));

    src_16x16 = _mm256_unpacklo_epi16(sub_result, zeros);
    dst_16x16 = _mm256_unpackhi_epi16(sub_result, zeros);

    src_16x16 = _mm256_madd_epi16(src_16x16, src_16x16);
    dst_16x16 = _mm256_madd_epi16(dst_16x16, dst_16x16);

    res0_4x64 = _mm256_unpacklo_epi32(src_16x16, zeros);
    res1_4x64 = _mm256_unpackhi_epi32(src_16x16, zeros);
    res2_4x64 = _mm256_unpacklo_epi32(dst_16x16, zeros);
    res3_4x64 = _mm256_unpackhi_epi32(dst_16x16, zeros);

    square_result = _mm256_add_epi64(
        square_result,
        _mm256_add_epi64(
            _mm256_add_epi64(_mm256_add_epi64(res0_4x64, res1_4x64), res2_4x64),
            res3_4x64));
  }

  const __m128i sum_2x64 =
      _mm_add_epi64(_mm256_castsi256_si128(square_result),
                    _mm256_extracti128_si256(square_result, 1));
  const __m128i sum_1x64 = _mm_add_epi64(sum_2x64, _mm_srli_si128(sum_2x64, 8));
  xx_storel_64(&sum, sum_1x64);
  return sum;
}

uint64_t aom_mse_wxh_16bit_highbd_avx2(uint16_t *dst, int dstride,
                                       uint16_t *src, int sstride, int w,
                                       int h) {
  assert((w == 8 || w == 4) && (h == 8 || h == 4) &&
         "w=8/4 and h=8/4 must satisfy");
  switch (w) {
    case 4: return aom_mse_4xh_16bit_highbd_avx2(dst, dstride, src, sstride, h);
    case 8: return aom_mse_8xh_16bit_highbd_avx2(dst, dstride, src, sstride, h);
    default: assert(0 && "unsupported width"); return -1;
  }
}