text: /*
   * Copyright (c) 2018, 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 <immintrin.h>
  
  #include "config/aom_dsp_rtcd.h"
  
  #include "aom_dsp/x86/convolve_avx2.h"
  #include "aom_dsp/x86/convolve_common_intrin.h"
  #include "aom_dsp/x86/convolve_sse4_1.h"
  #include "aom_dsp/aom_dsp_common.h"
  #include "aom_dsp/aom_filter.h"
  #include "av1/common/convolve.h"
  
  static INLINE __m256i unpack_weights_avx2(ConvolveParams *conv_params) {
    const int w0 = conv_params->fwd_offset;
    const int w1 = conv_params->bck_offset;
    const __m256i wt0 = _mm256_set1_epi16(w0);
    const __m256i wt1 = _mm256_set1_epi16(w1);
    const __m256i wt = _mm256_unpacklo_epi16(wt0, wt1);
    return wt;
  }
  
  static INLINE __m256i load_line2_avx2(const void *a, const void *b) {
    return _mm256_permute2x128_si256(
        _mm256_castsi128_si256(_mm_loadu_si128((__m128i *)a)),
        _mm256_castsi128_si256(_mm_loadu_si128((__m128i *)b)), 0x20);
  }
  
  void av1_dist_wtd_convolve_x_avx2(const uint8_t *src, int src_stride,
                                    uint8_t *dst0, int dst_stride0, int w, int h,
                                    const InterpFilterParams *filter_params_x,
                                    const int subpel_x_qn,
                                    ConvolveParams *conv_params) {
    CONV_BUF_TYPE *dst = conv_params->dst;
    int dst_stride = conv_params->dst_stride;
    const int bd = 8;
    int i, j, is_horiz_4tap = 0;
    const int bits = FILTER_BITS - conv_params->round_1;
    const __m256i wt = unpack_weights_avx2(conv_params);
    const int do_average = conv_params->do_average;
    const int use_dist_wtd_comp_avg = conv_params->use_dist_wtd_comp_avg;
    const int offset_0 =
        bd + 2 * FILTER_BITS - conv_params->round_0 - conv_params->round_1;
    const int offset = (1 << offset_0) + (1 << (offset_0 - 1));
    const __m256i offset_const = _mm256_set1_epi16(offset);
    const int rounding_shift =
        2 * FILTER_BITS - conv_params->round_0 - conv_params->round_1;
    const __m256i rounding_const = _mm256_set1_epi16((1 << rounding_shift) >> 1);
  
    assert(bits >= 0);
    assert(conv_params->round_0 > 0);
  
    const __m256i round_const =
        _mm256_set1_epi16((1 << (conv_params->round_0 - 1)) >> 1);
    const __m128i round_shift = _mm_cvtsi32_si128(conv_params->round_0 - 1);
  
    __m256i filt[4], coeffs[4];
  
    filt[0] = _mm256_load_si256((__m256i const *)filt_global_avx2);
    filt[1] = _mm256_load_si256((__m256i const *)(filt_global_avx2 + 32));
  
    prepare_coeffs_lowbd(filter_params_x, subpel_x_qn, coeffs);
  
    // Condition for checking valid horz_filt taps
    if (!(_mm256_extract_epi32(_mm256_or_si256(coeffs[0], coeffs[3]), 0)))
      is_horiz_4tap = 1;
  
    // horz_filt as 4 tap
    if (is_horiz_4tap) {
      const int fo_horiz = 1;
      const uint8_t *const src_ptr = src - fo_horiz;
      for (i = 0; i < h; i += 2) {
        const uint8_t *src_data = src_ptr + i * src_stride;
        CONV_BUF_TYPE *dst_data = dst + i * dst_stride;
        for (j = 0; j < w; j += 8) {
          const __m256i data =
              load_line2_avx2(&src_data[j], &src_data[j + src_stride]);
  
          __m256i res = convolve_lowbd_x_4tap(data, coeffs + 1, filt);
          res = _mm256_sra_epi16(_mm256_add_epi16(res, round_const), round_shift);
          res = _mm256_slli_epi16(res, bits);
  
          const __m256i res_unsigned = _mm256_add_epi16(res, offset_const);
  
          // Accumulate values into the destination buffer
          if (do_average) {
            const __m256i data_ref_0 =
                load_line2_avx2(&dst_data[j], &dst_data[j + dst_stride]);
            const __m256i comp_avg_res =
                comp_avg(&data_ref_0, &res_unsigned, &wt, use_dist_wtd_comp_avg);
  
            const __m256i round_result = convolve_rounding(
                &comp_avg_res, &offset_const, &rounding_const, rounding_shift);
  
            const __m256i res_8 = _mm256_packus_epi16(round_result, round_result);
            const __m128i res_0 = _mm256_castsi256_si128(res_8);
            const __m128i res_1 = _mm256_extracti128_si256(res_8, 1);
  
            if (w > 4) {
              _mm_storel_epi64((__m128i *)(&dst0[i * dst_stride0 + j]), res_0);
              _mm_storel_epi64(
                  (__m128i *)((&dst0[i * dst_stride0 + j + dst_stride0])), res_1);
            } else {
              *(uint32_t *)(&dst0[i * dst_stride0 + j]) =
                  _mm_cvtsi128_si32(res_0);
              *(uint32_t *)(&dst0[i * dst_stride0 + j + dst_stride0]) =
                  _mm_cvtsi128_si32(res_1);
            }
          } else {
            const __m128i res_0 = _mm256_castsi256_si128(res_unsigned);
            _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j]), res_0);
  
            const __m128i res_1 = _mm256_extracti128_si256(res_unsigned, 1);
            _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j + dst_stride]),
                             res_1);
          }
        }
      }
    } else {
      const int fo_horiz = filter_params_x->taps / 2 - 1;
      const uint8_t *const src_ptr = src - fo_horiz;
  
      filt[2] = _mm256_load_si256((__m256i const *)(filt_global_avx2 + 32 * 2));
      filt[3] = _mm256_load_si256((__m256i const *)(filt_global_avx2 + 32 * 3));
      for (i = 0; i < h; i += 2) {
        const uint8_t *src_data = src_ptr + i * src_stride;
        CONV_BUF_TYPE *dst_data = dst + i * dst_stride;
        for (j = 0; j < w; j += 8) {
          const __m256i data =
              load_line2_avx2(&src_data[j], &src_data[j + src_stride]);
  
          __m256i res = convolve_lowbd_x(data, coeffs, filt);
  
          res = _mm256_sra_epi16(_mm256_add_epi16(res, round_const), round_shift);
  
          res = _mm256_slli_epi16(res, bits);
  
          const __m256i res_unsigned = _mm256_add_epi16(res, offset_const);
  
          // Accumulate values into the destination buffer
          if (do_average) {
            const __m256i data_ref_0 =
                load_line2_avx2(&dst_data[j], &dst_data[j + dst_stride]);
            const __m256i comp_avg_res =
                comp_avg(&data_ref_0, &res_unsigned, &wt, use_dist_wtd_comp_avg);
  
            const __m256i round_result = convolve_rounding(
                &comp_avg_res, &offset_const, &rounding_const, rounding_shift);
  
            const __m256i res_8 = _mm256_packus_epi16(round_result, round_result);
            const __m128i res_0 = _mm256_castsi256_si128(res_8);
            const __m128i res_1 = _mm256_extracti128_si256(res_8, 1);
  
            if (w > 4) {
              _mm_storel_epi64((__m128i *)(&dst0[i * dst_stride0 + j]), res_0);
              _mm_storel_epi64(
                  (__m128i *)((&dst0[i * dst_stride0 + j + dst_stride0])), res_1);
            } else {
              *(uint32_t *)(&dst0[i * dst_stride0 + j]) =
                  _mm_cvtsi128_si32(res_0);
              *(uint32_t *)(&dst0[i * dst_stride0 + j + dst_stride0]) =
                  _mm_cvtsi128_si32(res_1);
            }
          } else {
            const __m128i res_0 = _mm256_castsi256_si128(res_unsigned);
            _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j]), res_0);
  
            const __m128i res_1 = _mm256_extracti128_si256(res_unsigned, 1);
            _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j + dst_stride]),
                             res_1);
          }
        }
      }
    }
  }
  
  void av1_dist_wtd_convolve_y_avx2(const uint8_t *src, int src_stride,
                                    uint8_t *dst0, int dst_stride0, int w, int h,
                                    const InterpFilterParams *filter_params_y,
                                    const int subpel_y_qn,
                                    ConvolveParams *conv_params) {
    CONV_BUF_TYPE *dst = conv_params->dst;
    int dst_stride = conv_params->dst_stride;
    const int bd = 8;
    int i, j, is_vert_4tap = 0;
    // +1 to compensate for dividing the filter coeffs by 2
    const int left_shift = FILTER_BITS - conv_params->round_0 + 1;
    const __m256i round_const =
        _mm256_set1_epi32((1 << conv_params->round_1) >> 1);
    const __m128i round_shift = _mm_cvtsi32_si128(conv_params->round_1);
    const __m256i wt = unpack_weights_avx2(conv_params);
    const int do_average = conv_params->do_average;
    const int use_dist_wtd_comp_avg = conv_params->use_dist_wtd_comp_avg;
    const int offset_0 =
        bd + 2 * FILTER_BITS - conv_params->round_0 - conv_params->round_1;
    const int offset = (1 << offset_0) + (1 << (offset_0 - 1));
    const __m256i offset_const = _mm256_set1_epi16(offset);
    const int offset_1 = (1 << (bd + FILTER_BITS - 2));
    const __m256i offset_const_1 = _mm256_set1_epi16(offset_1);
    const __m256i offset_const_2 = _mm256_set1_epi16((1 << offset_0));
    const int rounding_shift =
        2 * FILTER_BITS - conv_params->round_0 - conv_params->round_1;
    const __m256i rounding_const = _mm256_set1_epi16((1 << rounding_shift) >> 1);
    const __m256i zero = _mm256_setzero_si256();
    __m256i coeffs[4], s[8];
  
    assert((FILTER_BITS - conv_params->round_0) >= 0);
  
    prepare_coeffs_lowbd(filter_params_y, subpel_y_qn, coeffs);
  
    // Condition for checking valid vert_filt taps
    if (!(_mm256_extract_epi32(_mm256_or_si256(coeffs[0], coeffs[3]), 0)))
      is_vert_4tap = 1;
  
    if (is_vert_4tap) {
      const int fo_vert = 1;
      const uint8_t *const src_ptr = src - fo_vert * src_stride;
      for (j = 0; j < w; j += 16) {
        const uint8_t *data = &src_ptr[j];
        __m256i src4;
        // Load lines a and b. Line a to lower 128, line b to upper 128
        {
          __m256i src_ab[4];
          __m256i src_a[5];
          src_a[0] = _mm256_castsi128_si256(_mm_loadu_si128((__m128i *)data));
          for (int kk = 0; kk < 4; ++kk) {
            data += src_stride;
            src_a[kk + 1] =
                _mm256_castsi128_si256(_mm_loadu_si128((__m128i *)data));
            src_ab[kk] =
                _mm256_permute2x128_si256(src_a[kk], src_a[kk + 1], 0x20);
          }
          src4 = src_a[4];
          s[0] = _mm256_unpacklo_epi8(src_ab[0], src_ab[1]);
          s[1] = _mm256_unpacklo_epi8(src_ab[2], src_ab[3]);
  
          s[3] = _mm256_unpackhi_epi8(src_ab[0], src_ab[1]);
          s[4] = _mm256_unpackhi_epi8(src_ab[2], src_ab[3]);
        }
  
        for (i = 0; i < h; i += 2) {
          data = &src_ptr[(i + 5) * src_stride + j];
          const __m256i src5 =
              _mm256_castsi128_si256(_mm_loadu_si128((__m128i *)data));
          const __m256i src_45a = _mm256_permute2x128_si256(src4, src5, 0x20);
  
          src4 = _mm256_castsi128_si256(
              _mm_loadu_si128((__m128i *)(data + src_stride)));
          const __m256i src_56a = _mm256_permute2x128_si256(src5, src4, 0x20);
  
          s[2] = _mm256_unpacklo_epi8(src_45a, src_56a);
          s[5] = _mm256_unpackhi_epi8(src_45a, src_56a);
  
          __m256i res_lo = convolve_lowbd_4tap(s, coeffs + 1);
  
          res_lo = _mm256_add_epi16(res_lo, offset_const_1);
  
          const __m256i res_lo_0_32b = _mm256_unpacklo_epi16(res_lo, zero);
          const __m256i res_lo_0_shift =
              _mm256_slli_epi32(res_lo_0_32b, left_shift);
          const __m256i res_lo_0_round = _mm256_sra_epi32(
              _mm256_add_epi32(res_lo_0_shift, round_const), round_shift);
  
          const __m256i res_lo_1_32b = _mm256_unpackhi_epi16(res_lo, zero);
          const __m256i res_lo_1_shift =
              _mm256_slli_epi32(res_lo_1_32b, left_shift);
          const __m256i res_lo_1_round = _mm256_sra_epi32(
              _mm256_add_epi32(res_lo_1_shift, round_const), round_shift);
  
          const __m256i res_lo_round =
              _mm256_packs_epi32(res_lo_0_round, res_lo_1_round);
  
          const __m256i res_lo_unsigned =
              _mm256_add_epi16(res_lo_round, offset_const_2);
  
          if (w - j < 16) {
            if (do_average) {
              const __m256i data_ref_0 =
                  load_line2_avx2(&dst[i * dst_stride + j],
                                  &dst[i * dst_stride + j + dst_stride]);
              const __m256i comp_avg_res = comp_avg(&data_ref_0, &res_lo_unsigned,
                                                    &wt, use_dist_wtd_comp_avg);
  
              const __m256i round_result = convolve_rounding(
                  &comp_avg_res, &offset_const, &rounding_const, rounding_shift);
  
              const __m256i res_8 =
                  _mm256_packus_epi16(round_result, round_result);
              const __m128i res_0 = _mm256_castsi256_si128(res_8);
              const __m128i res_1 = _mm256_extracti128_si256(res_8, 1);
  
              if (w - j > 4) {
                _mm_storel_epi64((__m128i *)(&dst0[i * dst_stride0 + j]), res_0);
                _mm_storel_epi64(
                    (__m128i *)((&dst0[i * dst_stride0 + j + dst_stride0])),
                    res_1);
              } else {
                *(uint32_t *)(&dst0[i * dst_stride0 + j]) =
                    _mm_cvtsi128_si32(res_0);
                *(uint32_t *)(&dst0[i * dst_stride0 + j + dst_stride0]) =
                    _mm_cvtsi128_si32(res_1);
              }
            } else {
              const __m128i res_0 = _mm256_castsi256_si128(res_lo_unsigned);
              _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j]), res_0);
  
              const __m128i res_1 = _mm256_extracti128_si256(res_lo_unsigned, 1);
              _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j + dst_stride]),
                               res_1);
            }
          } else {
            __m256i res_hi = convolve_lowbd_4tap(s + 3, coeffs + 1);
  
            res_hi = _mm256_add_epi16(res_hi, offset_const_1);
  
            const __m256i res_hi_0_32b = _mm256_unpacklo_epi16(res_hi, zero);
            const __m256i res_hi_0_shift =
                _mm256_slli_epi32(res_hi_0_32b, left_shift);
            const __m256i res_hi_0_round = _mm256_sra_epi32(
                _mm256_add_epi32(res_hi_0_shift, round_const), round_shift);
  
            const __m256i res_hi_1_32b = _mm256_unpackhi_epi16(res_hi, zero);
            const __m256i res_hi_1_shift =
                _mm256_slli_epi32(res_hi_1_32b, left_shift);
            const __m256i res_hi_1_round = _mm256_sra_epi32(
                _mm256_add_epi32(res_hi_1_shift, round_const), round_shift);
  
            const __m256i res_hi_round =
                _mm256_packs_epi32(res_hi_0_round, res_hi_1_round);
  
            const __m256i res_hi_unsigned =
                _mm256_add_epi16(res_hi_round, offset_const_2);
  
            if (do_average) {
              const __m256i data_ref_0_lo =
                  load_line2_avx2(&dst[i * dst_stride + j],
                                  &dst[i * dst_stride + j + dst_stride]);
  
              const __m256i data_ref_0_hi =
                  load_line2_avx2(&dst[i * dst_stride + j + 8],
                                  &dst[i * dst_stride + j + 8 + dst_stride]);
  
              const __m256i comp_avg_res_lo = comp_avg(
                  &data_ref_0_lo, &res_lo_unsigned, &wt, use_dist_wtd_comp_avg);
  
              const __m256i comp_avg_res_hi = comp_avg(
                  &data_ref_0_hi, &res_hi_unsigned, &wt, use_dist_wtd_comp_avg);
  
              const __m256i round_result_lo =
                  convolve_rounding(&comp_avg_res_lo, &offset_const,
                                    &rounding_const, rounding_shift);
  
              const __m256i round_result_hi =
                  convolve_rounding(&comp_avg_res_hi, &offset_const,
                                    &rounding_const, rounding_shift);
  
              const __m256i res_8 =
                  _mm256_packus_epi16(round_result_lo, round_result_hi);
              const __m128i res_0 = _mm256_castsi256_si128(res_8);
              const __m128i res_1 = _mm256_extracti128_si256(res_8, 1);
  
              _mm_storeu_si128((__m128i *)(&dst0[i * dst_stride0 + j]), res_0);
              _mm_storeu_si128(
                  (__m128i *)((&dst0[i * dst_stride0 + j + dst_stride0])), res_1);
  
            } else {
              const __m128i res_lo_0 = _mm256_castsi256_si128(res_lo_unsigned);
              _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j]), res_lo_0);
  
              const __m128i res_lo_1 =
                  _mm256_extracti128_si256(res_lo_unsigned, 1);
              _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j + dst_stride]),
                               res_lo_1);
  
              const __m128i res_hi_0 = _mm256_castsi256_si128(res_hi_unsigned);
              _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j + 8]),
                               res_hi_0);
  
              const __m128i res_hi_1 =
                  _mm256_extracti128_si256(res_hi_unsigned, 1);
              _mm_storeu_si128(
                  (__m128i *)(&dst[i * dst_stride + j + 8 + dst_stride]),
                  res_hi_1);
            }
          }
          s[0] = s[1];
          s[1] = s[2];
  
          s[3] = s[4];
          s[4] = s[5];
        }
      }
    } else {
      const int fo_vert = filter_params_y->taps / 2 - 1;
      const uint8_t *const src_ptr = src - fo_vert * src_stride;
      for (j = 0; j < w; j += 16) {
        const uint8_t *data = &src_ptr[j];
        __m256i src6;
        // Load lines a and b. Line a to lower 128, line b to upper 128
        {
          __m256i src_ab[7];
          __m256i src_a[7];
          src_a[0] = _mm256_castsi128_si256(_mm_loadu_si128((__m128i *)data));
          for (int kk = 0; kk < 6; ++kk) {
            data += src_stride;
            src_a[kk + 1] =
                _mm256_castsi128_si256(_mm_loadu_si128((__m128i *)data));
            src_ab[kk] =
                _mm256_permute2x128_si256(src_a[kk], src_a[kk + 1], 0x20);
          }
          src6 = src_a[6];
          s[0] = _mm256_unpacklo_epi8(src_ab[0], src_ab[1]);
          s[1] = _mm256_unpacklo_epi8(src_ab[2], src_ab[3]);
          s[2] = _mm256_unpacklo_epi8(src_ab[4], src_ab[5]);
          s[4] = _mm256_unpackhi_epi8(src_ab[0], src_ab[1]);
          s[5] = _mm256_unpackhi_epi8(src_ab[2], src_ab[3]);
          s[6] = _mm256_unpackhi_epi8(src_ab[4], src_ab[5]);
        }
  
        for (i = 0; i < h; i += 2) {
          data = &src_ptr[(i + 7) * src_stride + j];
          const __m256i src7 =
              _mm256_castsi128_si256(_mm_loadu_si128((__m128i *)data));
          const __m256i src_67a = _mm256_permute2x128_si256(src6, src7, 0x20);
  
          src6 = _mm256_castsi128_si256(
              _mm_loadu_si128((__m128i *)(data + src_stride)));
          const __m256i src_78a = _mm256_permute2x128_si256(src7, src6, 0x20);
  
          s[3] = _mm256_unpacklo_epi8(src_67a, src_78a);
          s[7] = _mm256_unpackhi_epi8(src_67a, src_78a);
  
          __m256i res_lo = convolve_lowbd(s, coeffs);
  
          res_lo = _mm256_add_epi16(res_lo, offset_const_1);
  
          const __m256i res_lo_0_32b = _mm256_unpacklo_epi16(res_lo, zero);
          const __m256i res_lo_0_shift =
              _mm256_slli_epi32(res_lo_0_32b, left_shift);
          const __m256i res_lo_0_round = _mm256_sra_epi32(
              _mm256_add_epi32(res_lo_0_shift, round_const), round_shift);
  
          const __m256i res_lo_1_32b = _mm256_unpackhi_epi16(res_lo, zero);
          const __m256i res_lo_1_shift =
              _mm256_slli_epi32(res_lo_1_32b, left_shift);
          const __m256i res_lo_1_round = _mm256_sra_epi32(
              _mm256_add_epi32(res_lo_1_shift, round_const), round_shift);
  
          const __m256i res_lo_round =
              _mm256_packs_epi32(res_lo_0_round, res_lo_1_round);
  
          const __m256i res_lo_unsigned =
              _mm256_add_epi16(res_lo_round, offset_const_2);
  
          if (w - j < 16) {
            if (do_average) {
              const __m256i data_ref_0 =
                  load_line2_avx2(&dst[i * dst_stride + j],
                                  &dst[i * dst_stride + j + dst_stride]);
              const __m256i comp_avg_res = comp_avg(&data_ref_0, &res_lo_unsigned,
                                                    &wt, use_dist_wtd_comp_avg);
  
              const __m256i round_result = convolve_rounding(
                  &comp_avg_res, &offset_const, &rounding_const, rounding_shift);
  
              const __m256i res_8 =
                  _mm256_packus_epi16(round_result, round_result);
              const __m128i res_0 = _mm256_castsi256_si128(res_8);
              const __m128i res_1 = _mm256_extracti128_si256(res_8, 1);
  
              if (w - j > 4) {
                _mm_storel_epi64((__m128i *)(&dst0[i * dst_stride0 + j]), res_0);
                _mm_storel_epi64(
                    (__m128i *)((&dst0[i * dst_stride0 + j + dst_stride0])),
                    res_1);
              } else {
                *(uint32_t *)(&dst0[i * dst_stride0 + j]) =
                    _mm_cvtsi128_si32(res_0);
                *(uint32_t *)(&dst0[i * dst_stride0 + j + dst_stride0]) =
                    _mm_cvtsi128_si32(res_1);
              }
            } else {
              const __m128i res_0 = _mm256_castsi256_si128(res_lo_unsigned);
              _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j]), res_0);
  
              const __m128i res_1 = _mm256_extracti128_si256(res_lo_unsigned, 1);
              _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j + dst_stride]),
                               res_1);
            }
          } else {
            __m256i res_hi = convolve_lowbd(s + 4, coeffs);
  
            res_hi = _mm256_add_epi16(res_hi, offset_const_1);
  
            const __m256i res_hi_0_32b = _mm256_unpacklo_epi16(res_hi, zero);
            const __m256i res_hi_0_shift =
                _mm256_slli_epi32(res_hi_0_32b, left_shift);
            const __m256i res_hi_0_round = _mm256_sra_epi32(
                _mm256_add_epi32(res_hi_0_shift, round_const), round_shift);
  
            const __m256i res_hi_1_32b = _mm256_unpackhi_epi16(res_hi, zero);
            const __m256i res_hi_1_shift =
                _mm256_slli_epi32(res_hi_1_32b, left_shift);
            const __m256i res_hi_1_round = _mm256_sra_epi32(
                _mm256_add_epi32(res_hi_1_shift, round_const), round_shift);
  
            const __m256i res_hi_round =
                _mm256_packs_epi32(res_hi_0_round, res_hi_1_round);
  
            const __m256i res_hi_unsigned =
                _mm256_add_epi16(res_hi_round, offset_const_2);
  
            if (do_average) {
              const __m256i data_ref_0_lo =
                  load_line2_avx2(&dst[i * dst_stride + j],
                                  &dst[i * dst_stride + j + dst_stride]);
  
              const __m256i data_ref_0_hi =
                  load_line2_avx2(&dst[i * dst_stride + j + 8],
                                  &dst[i * dst_stride + j + 8 + dst_stride]);
  
              const __m256i comp_avg_res_lo = comp_avg(
                  &data_ref_0_lo, &res_lo_unsigned, &wt, use_dist_wtd_comp_avg);
  
              const __m256i comp_avg_res_hi = comp_avg(
                  &data_ref_0_hi, &res_hi_unsigned, &wt, use_dist_wtd_comp_avg);
  
              const __m256i round_result_lo =
                  convolve_rounding(&comp_avg_res_lo, &offset_const,
                                    &rounding_const, rounding_shift);
  
              const __m256i round_result_hi =
                  convolve_rounding(&comp_avg_res_hi, &offset_const,
                                    &rounding_const, rounding_shift);
  
              const __m256i res_8 =
                  _mm256_packus_epi16(round_result_lo, round_result_hi);
              const __m128i res_0 = _mm256_castsi256_si128(res_8);
              const __m128i res_1 = _mm256_extracti128_si256(res_8, 1);
  
              _mm_storeu_si128((__m128i *)(&dst0[i * dst_stride0 + j]), res_0);
              _mm_storeu_si128(
                  (__m128i *)((&dst0[i * dst_stride0 + j + dst_stride0])), res_1);
  
            } else {
              const __m128i res_lo_0 = _mm256_castsi256_si128(res_lo_unsigned);
              _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j]), res_lo_0);
  
              const __m128i res_lo_1 =
                  _mm256_extracti128_si256(res_lo_unsigned, 1);
              _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j + dst_stride]),
                               res_lo_1);
  
              const __m128i res_hi_0 = _mm256_castsi256_si128(res_hi_unsigned);
              _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j + 8]),
                               res_hi_0);
  
              const __m128i res_hi_1 =
                  _mm256_extracti128_si256(res_hi_unsigned, 1);
              _mm_storeu_si128(
                  (__m128i *)(&dst[i * dst_stride + j + 8 + dst_stride]),
                  res_hi_1);
            }
          }
          s[0] = s[1];
          s[1] = s[2];
          s[2] = s[3];
  
          s[4] = s[5];
          s[5] = s[6];
          s[6] = s[7];
        }
      }
    }
  }
  
  void av1_dist_wtd_convolve_2d_avx2(const uint8_t *src, int src_stride,
                                     uint8_t *dst0, int dst_stride0, int w, int h,
                                     const InterpFilterParams *filter_params_x,
                                     const InterpFilterParams *filter_params_y,
                                     const int subpel_x_qn, const int subpel_y_qn,
                                     ConvolveParams *conv_params) {
    CONV_BUF_TYPE *dst = conv_params->dst;
    int dst_stride = conv_params->dst_stride;
    const int bd = 8;
  
    DECLARE_ALIGNED(32, int16_t, im_block[(MAX_SB_SIZE + MAX_FILTER_TAP) * 8]);
  
    int im_stride = 8;
    int i, is_horiz_4tap = 0, is_vert_4tap = 0;
    const __m256i wt = unpack_weights_avx2(conv_params);
    const int do_average = conv_params->do_average;
    const int use_dist_wtd_comp_avg = conv_params->use_dist_wtd_comp_avg;
    const int offset_0 =
        bd + 2 * FILTER_BITS - conv_params->round_0 - conv_params->round_1;
    const int offset = (1 << offset_0) + (1 << (offset_0 - 1));
    const __m256i offset_const = _mm256_set1_epi16(offset);
    const int rounding_shift =
        2 * FILTER_BITS - conv_params->round_0 - conv_params->round_1;
    const __m256i rounding_const = _mm256_set1_epi16((1 << rounding_shift) >> 1);
  
    assert(conv_params->round_0 > 0);
  
    const __m256i round_const_h = _mm256_set1_epi16(
        ((1 << (conv_params->round_0 - 1)) >> 1) + (1 << (bd + FILTER_BITS - 2)));
    const __m128i round_shift_h = _mm_cvtsi32_si128(conv_params->round_0 - 1);
  
    const __m256i round_const_v = _mm256_set1_epi32(
        ((1 << conv_params->round_1) >> 1) -
        (1 << (bd + 2 * FILTER_BITS - conv_params->round_0 - 1)));
    const __m128i round_shift_v = _mm_cvtsi32_si128(conv_params->round_1);
  
    __m256i filt[4], coeffs_x[4], coeffs_y[4];
  
    filt[0] = _mm256_load_si256((__m256i const *)filt_global_avx2);
    filt[1] = _mm256_load_si256((__m256i const *)(filt_global_avx2 + 32));
  
    prepare_coeffs_lowbd(filter_params_x, subpel_x_qn, coeffs_x);
    prepare_coeffs(filter_params_y, subpel_y_qn, coeffs_y);
  
    // Condition for checking valid horz_filt taps
    if (!(_mm256_extract_epi32(_mm256_or_si256(coeffs_x[0], coeffs_x[3]), 0)))
      is_horiz_4tap = 1;
  
    // Condition for checking valid vert_filt taps
    if (!(_mm256_extract_epi32(_mm256_or_si256(coeffs_y[0], coeffs_y[3]), 0)))
      is_vert_4tap = 1;
  
    if (is_horiz_4tap) {
      int im_h = h + filter_params_y->taps - 1;
      const int fo_vert = filter_params_y->taps / 2 - 1;
      const int fo_horiz = 1;
      const uint8_t *const src_ptr = src - fo_vert * src_stride - fo_horiz;
      for (int j = 0; j < w; j += 8) {
        /* Horizontal filter */
        const uint8_t *src_h = src_ptr + j;
        for (i = 0; i < im_h; i += 2) {
          __m256i data =
              _mm256_castsi128_si256(_mm_loadu_si128((__m128i *)src_h));
          if (i + 1 < im_h)
            data = _mm256_inserti128_si256(
                data, _mm_loadu_si128((__m128i *)(src_h + src_stride)), 1);
          src_h += (src_stride << 1);
          __m256i res = convolve_lowbd_x_4tap(data, coeffs_x + 1, filt);
  
          res = _mm256_sra_epi16(_mm256_add_epi16(res, round_const_h),
                                 round_shift_h);
  
          _mm256_storeu_si256((__m256i *)&im_block[i * im_stride], res);
        }
        DIST_WTD_CONVOLVE_VERTICAL_FILTER_8TAP;
      }
    } else if (is_vert_4tap) {
      int im_h = h + 3;
      const int fo_vert = 1;
      const int fo_horiz = filter_params_x->taps / 2 - 1;
      const uint8_t *const src_ptr = src - fo_vert * src_stride - fo_horiz;
  
      filt[2] = _mm256_load_si256((__m256i const *)(filt_global_avx2 + 32 * 2));
      filt[3] = _mm256_load_si256((__m256i const *)(filt_global_avx2 + 32 * 3));
  
      for (int j = 0; j < w; j += 8) {
        /* Horizontal filter */
        const uint8_t *src_h = src_ptr + j;
        DIST_WTD_CONVOLVE_HORIZONTAL_FILTER_8TAP;
  
        /* Vertical filter */
        __m256i s[6];
        __m256i s0 = _mm256_loadu_si256((__m256i *)(im_block + 0 * im_stride));
        __m256i s1 = _mm256_loadu_si256((__m256i *)(im_block + 1 * im_stride));
        __m256i s2 = _mm256_loadu_si256((__m256i *)(im_block + 2 * im_stride));
        __m256i s3 = _mm256_loadu_si256((__m256i *)(im_block + 3 * im_stride));
  
        s[0] = _mm256_unpacklo_epi16(s0, s1);
        s[1] = _mm256_unpacklo_epi16(s2, s3);
  
        s[3] = _mm256_unpackhi_epi16(s0, s1);
        s[4] = _mm256_unpackhi_epi16(s2, s3);
  
        for (i = 0; i < h; i += 2) {
          const int16_t *data = &im_block[i * im_stride];
  
          const __m256i s4 =
              _mm256_loadu_si256((__m256i *)(data + 4 * im_stride));
          const __m256i s5 =
              _mm256_loadu_si256((__m256i *)(data + 5 * im_stride));
  
          s[2] = _mm256_unpacklo_epi16(s4, s5);
          s[5] = _mm256_unpackhi_epi16(s4, s5);
  
          const __m256i res_a = convolve_4tap(s, coeffs_y + 1);
          const __m256i res_a_round = _mm256_sra_epi32(
              _mm256_add_epi32(res_a, round_const_v), round_shift_v);
  
          if (w - j > 4) {
            const __m256i res_b = convolve_4tap(s + 3, coeffs_y + 1);
            const __m256i res_b_round = _mm256_sra_epi32(
                _mm256_add_epi32(res_b, round_const_v), round_shift_v);
            const __m256i res_16b = _mm256_packs_epi32(res_a_round, res_b_round);
            const __m256i res_unsigned = _mm256_add_epi16(res_16b, offset_const);
  
            if (do_average) {
              const __m256i data_ref_0 =
                  load_line2_avx2(&dst[i * dst_stride + j],
                                  &dst[i * dst_stride + j + dst_stride]);
              const __m256i comp_avg_res = comp_avg(&data_ref_0, &res_unsigned,
                                                    &wt, use_dist_wtd_comp_avg);
  
              const __m256i round_result = convolve_rounding(
                  &comp_avg_res, &offset_const, &rounding_const, rounding_shift);
  
              const __m256i res_8 =
                  _mm256_packus_epi16(round_result, round_result);
              const __m128i res_0 = _mm256_castsi256_si128(res_8);
              const __m128i res_1 = _mm256_extracti128_si256(res_8, 1);
  
              _mm_storel_epi64((__m128i *)(&dst0[i * dst_stride0 + j]), res_0);
              _mm_storel_epi64(
                  (__m128i *)((&dst0[i * dst_stride0 + j + dst_stride0])), res_1);
            } else {
              const __m128i res_0 = _mm256_castsi256_si128(res_unsigned);
              _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j]), res_0);
  
              const __m128i res_1 = _mm256_extracti128_si256(res_unsigned, 1);
              _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j + dst_stride]),
                               res_1);
            }
          } else {
            const __m256i res_16b = _mm256_packs_epi32(res_a_round, res_a_round);
            const __m256i res_unsigned = _mm256_add_epi16(res_16b, offset_const);
  
            if (do_average) {
              const __m256i data_ref_0 =
                  load_line2_avx2(&dst[i * dst_stride + j],
                                  &dst[i * dst_stride + j + dst_stride]);
  
              const __m256i comp_avg_res = comp_avg(&data_ref_0, &res_unsigned,
                                                    &wt, use_dist_wtd_comp_avg);
  
              const __m256i round_result = convolve_rounding(
                  &comp_avg_res, &offset_const, &rounding_const, rounding_shift);
  
              const __m256i res_8 =
                  _mm256_packus_epi16(round_result, round_result);
              const __m128i res_0 = _mm256_castsi256_si128(res_8);
              const __m128i res_1 = _mm256_extracti128_si256(res_8, 1);
  
              *(uint32_t *)(&dst0[i * dst_stride0 + j]) =
                  _mm_cvtsi128_si32(res_0);
              *(uint32_t *)(&dst0[i * dst_stride0 + j + dst_stride0]) =
                  _mm_cvtsi128_si32(res_1);
  
            } else {
              const __m128i res_0 = _mm256_castsi256_si128(res_unsigned);
              _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j]), res_0);
  
              const __m128i res_1 = _mm256_extracti128_si256(res_unsigned, 1);
              _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j + dst_stride]),
                               res_1);
            }
          }
          s[0] = s[1];
          s[1] = s[2];
          s[3] = s[4];
          s[4] = s[5];
        }
      }
    } else {
      int im_h = h + filter_params_y->taps - 1;
      const int fo_vert = filter_params_y->taps / 2 - 1;
      const int fo_horiz = filter_params_x->taps / 2 - 1;
      const uint8_t *const src_ptr = src - fo_vert * src_stride - fo_horiz;
  
      filt[2] = _mm256_load_si256((__m256i const *)(filt_global_avx2 + 32 * 2));
      filt[3] = _mm256_load_si256((__m256i const *)(filt_global_avx2 + 32 * 3));
  
      for (int j = 0; j < w; j += 8) {
        /* Horizontal filter */
        const uint8_t *src_h = src_ptr + j;
        DIST_WTD_CONVOLVE_HORIZONTAL_FILTER_8TAP;
  
        DIST_WTD_CONVOLVE_VERTICAL_FILTER_8TAP;
      }
    }
  }
  
  void av1_dist_wtd_convolve_2d_copy_avx2(const uint8_t *src, int src_stride,
                                          uint8_t *dst0, int dst_stride0, int w,
                                          int h, ConvolveParams *conv_params) {
    const int bd = 8;
    CONV_BUF_TYPE *dst = conv_params->dst;
    int dst_stride = conv_params->dst_stride;
  
    const int bits =
        FILTER_BITS * 2 - conv_params->round_1 - conv_params->round_0;
    const __m128i left_shift = _mm_cvtsi32_si128(bits);
    const int do_average = conv_params->do_average;
    const int use_dist_wtd_comp_avg = conv_params->use_dist_wtd_comp_avg;
    const __m256i wt = unpack_weights_avx2(conv_params);
    const __m256i zero = _mm256_setzero_si256();
  
    const int offset_0 =
        bd + 2 * FILTER_BITS - conv_params->round_0 - conv_params->round_1;
    const int offset = (1 << offset_0) + (1 << (offset_0 - 1));
    const __m256i offset_const = _mm256_set1_epi16(offset);
    const int rounding_shift =
        2 * FILTER_BITS - conv_params->round_0 - conv_params->round_1;
    const __m256i rounding_const = _mm256_set1_epi16((1 << rounding_shift) >> 1);
    int i, j;
  
    if (!(w % 16)) {
      for (i = 0; i < h; i += 1) {
        for (j = 0; j < w; j += 16) {
          const __m256i src_16bit = _mm256_cvtepu8_epi16(
              _mm_loadu_si128((__m128i *)(&src[i * src_stride + j])));
  
          const __m256i res = _mm256_sll_epi16(src_16bit, left_shift);
          const __m256i res_unsigned = _mm256_add_epi16(res, offset_const);
  
          if (do_average) {
            const __m256i data_ref_0 =
                _mm256_loadu_si256((__m256i *)(&dst[i * dst_stride + j]));
  
            const __m256i comp_avg_res =
                comp_avg(&data_ref_0, &res_unsigned, &wt, use_dist_wtd_comp_avg);
  
            const __m256i round_result = convolve_rounding(
                &comp_avg_res, &offset_const, &rounding_const, rounding_shift);
  
            const __m256i res_8 = _mm256_packus_epi16(round_result, round_result);
            const __m256i res_0 = _mm256_permute4x64_epi64(res_8, 0xD8);
  
            _mm_storeu_si128((__m128i *)(&dst0[i * dst_stride0 + j]),
                             _mm256_castsi256_si128(res_0));
          } else {
            _mm256_storeu_si256((__m256i *)(&dst[i * dst_stride + j]),
                                res_unsigned);
          }
        }
      }
    } else if (!(w % 4)) {
      for (i = 0; i < h; i += 2) {
        for (j = 0; j < w; j += 8) {
          const __m128i src_row_0 =
              _mm_loadl_epi64((__m128i *)(&src[i * src_stride + j]));
          const __m128i src_row_1 =
              _mm_loadl_epi64((__m128i *)(&src[i * src_stride + j + src_stride]));
          // since not all compilers yet support _mm256_set_m128i()
          const __m256i src_10 = _mm256_insertf128_si256(
              _mm256_castsi128_si256(src_row_0), src_row_1, 1);
  
          const __m256i src_16bit = _mm256_unpacklo_epi8(src_10, zero);
  
          const __m256i res = _mm256_sll_epi16(src_16bit, left_shift);
  
          const __m256i res_unsigned = _mm256_add_epi16(res, offset_const);
  
          // Accumulate values into the destination buffer
          if (do_average) {
            const __m256i data_ref_0 = load_line2_avx2(
                &dst[i * dst_stride + j], &dst[i * dst_stride + j + dst_stride]);
            const __m256i comp_avg_res =
                comp_avg(&data_ref_0, &res_unsigned, &wt, use_dist_wtd_comp_avg);
  
            const __m256i round_result = convolve_rounding(
                &comp_avg_res, &offset_const, &rounding_const, rounding_shift);
  
            const __m256i res_8 = _mm256_packus_epi16(round_result, round_result);
            const __m128i res_0 = _mm256_castsi256_si128(res_8);
            const __m128i res_1 = _mm256_extracti128_si256(res_8, 1);
  
            if (w > 4) {
              _mm_storel_epi64((__m128i *)(&dst0[i * dst_stride0 + j]), res_0);
              _mm_storel_epi64(
                  (__m128i *)((&dst0[i * dst_stride0 + j + dst_stride0])), res_1);
            } else {
              *(uint32_t *)(&dst0[i * dst_stride0 + j]) =
                  _mm_cvtsi128_si32(res_0);
              *(uint32_t *)(&dst0[i * dst_stride0 + j + dst_stride0]) =
                  _mm_cvtsi128_si32(res_1);
            }
          } else {
            const __m128i res_0 = _mm256_castsi256_si128(res_unsigned);
            _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j]), res_0);
  
            const __m128i res_1 = _mm256_extracti128_si256(res_unsigned, 1);
            _mm_storeu_si128((__m128i *)(&dst[i * dst_stride + j + dst_stride]),
                             res_1);
          }
        }
      }
    }
  }
  