text: /*
   * Copyright (c) 2017, 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 <assert.h>
  
  #include "config/aom_dsp_rtcd.h"
  
  #include "aom_dsp/x86/convolve_avx2.h"
  #include "aom_dsp/x86/synonyms.h"
  #include "aom_dsp/aom_dsp_common.h"
  #include "aom_dsp/aom_filter.h"
  #include "av1/common/convolve.h"
  
  void av1_highbd_convolve_2d_sr_avx2(const uint16_t *src, int src_stride,
                                      uint16_t *dst, int dst_stride, int w, int h,
                                      const InterpFilterParams *filter_params_x,
                                      const InterpFilterParams *filter_params_y,
                                      const int subpel_x_q4,
                                      const int subpel_y_q4,
                                      ConvolveParams *conv_params, int bd) {
    DECLARE_ALIGNED(32, int16_t, im_block[(MAX_SB_SIZE + MAX_FILTER_TAP) * 8]);
    int im_h = h + filter_params_y->taps - 1;
    int im_stride = 8;
    int i, j;
    const int fo_vert = filter_params_y->taps / 2 - 1;
    const int fo_horiz = filter_params_x->taps / 2 - 1;
    const uint16_t *const src_ptr = src - fo_vert * src_stride - fo_horiz;
  
    // Check that, even with 12-bit input, the intermediate values will fit
    // into an unsigned 16-bit intermediate array.
    assert(bd + FILTER_BITS + 2 - conv_params->round_0 <= 16);
  
    __m256i s[8], coeffs_y[4], coeffs_x[4];
  
    const __m256i round_const_x = _mm256_set1_epi32(
        ((1 << conv_params->round_0) >> 1) + (1 << (bd + FILTER_BITS - 1)));
    const __m128i round_shift_x = _mm_cvtsi32_si128(conv_params->round_0);
  
    const __m256i round_const_y = _mm256_set1_epi32(
        ((1 << conv_params->round_1) >> 1) -
        (1 << (bd + 2 * FILTER_BITS - conv_params->round_0 - 1)));
    const __m128i round_shift_y = _mm_cvtsi32_si128(conv_params->round_1);
  
    const int bits =
        FILTER_BITS * 2 - conv_params->round_0 - conv_params->round_1;
    const __m128i round_shift_bits = _mm_cvtsi32_si128(bits);
    const __m256i round_const_bits = _mm256_set1_epi32((1 << bits) >> 1);
    const __m256i clip_pixel =
        _mm256_set1_epi16(bd == 10 ? 1023 : (bd == 12 ? 4095 : 255));
    const __m256i zero = _mm256_setzero_si256();
  
    prepare_coeffs(filter_params_x, subpel_x_q4, coeffs_x);
    prepare_coeffs(filter_params_y, subpel_y_q4, coeffs_y);
  
    for (j = 0; j < w; j += 8) {
      /* Horizontal filter */
      {
        for (i = 0; i < im_h; i += 2) {
          const __m256i row0 =
              _mm256_loadu_si256((__m256i *)&src_ptr[i * src_stride + j]);
          __m256i row1 = _mm256_set1_epi16(0);
          if (i + 1 < im_h)
            row1 =
                _mm256_loadu_si256((__m256i *)&src_ptr[(i + 1) * src_stride + j]);
  
          const __m256i r0 = _mm256_permute2x128_si256(row0, row1, 0x20);
          const __m256i r1 = _mm256_permute2x128_si256(row0, row1, 0x31);
  
          // even pixels
          s[0] = _mm256_alignr_epi8(r1, r0, 0);
          s[1] = _mm256_alignr_epi8(r1, r0, 4);
          s[2] = _mm256_alignr_epi8(r1, r0, 8);
          s[3] = _mm256_alignr_epi8(r1, r0, 12);
  
          __m256i res_even = convolve(s, coeffs_x);
          res_even = _mm256_sra_epi32(_mm256_add_epi32(res_even, round_const_x),
                                      round_shift_x);
  
          // odd pixels
          s[0] = _mm256_alignr_epi8(r1, r0, 2);
          s[1] = _mm256_alignr_epi8(r1, r0, 6);
          s[2] = _mm256_alignr_epi8(r1, r0, 10);
          s[3] = _mm256_alignr_epi8(r1, r0, 14);
  
          __m256i res_odd = convolve(s, coeffs_x);
          res_odd = _mm256_sra_epi32(_mm256_add_epi32(res_odd, round_const_x),
                                     round_shift_x);
  
          __m256i res_even1 = _mm256_packs_epi32(res_even, res_even);
          __m256i res_odd1 = _mm256_packs_epi32(res_odd, res_odd);
          __m256i res = _mm256_unpacklo_epi16(res_even1, res_odd1);
  
          _mm256_store_si256((__m256i *)&im_block[i * im_stride], res);
        }
      }
  
      /* Vertical filter */
      {
        __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));
        __m256i s4 = _mm256_loadu_si256((__m256i *)(im_block + 4 * im_stride));
        __m256i s5 = _mm256_loadu_si256((__m256i *)(im_block + 5 * im_stride));
  
        s[0] = _mm256_unpacklo_epi16(s0, s1);
        s[1] = _mm256_unpacklo_epi16(s2, s3);
        s[2] = _mm256_unpacklo_epi16(s4, s5);
  
        s[4] = _mm256_unpackhi_epi16(s0, s1);
        s[5] = _mm256_unpackhi_epi16(s2, s3);
        s[6] = _mm256_unpackhi_epi16(s4, s5);
  
        for (i = 0; i < h; i += 2) {
          const int16_t *data = &im_block[i * im_stride];
  
          const __m256i s6 =
              _mm256_loadu_si256((__m256i *)(data + 6 * im_stride));
          const __m256i s7 =
              _mm256_loadu_si256((__m256i *)(data + 7 * im_stride));
  
          s[3] = _mm256_unpacklo_epi16(s6, s7);
          s[7] = _mm256_unpackhi_epi16(s6, s7);
  
          const __m256i res_a = convolve(s, coeffs_y);
          __m256i res_a_round = _mm256_sra_epi32(
              _mm256_add_epi32(res_a, round_const_y), round_shift_y);
  
          res_a_round = _mm256_sra_epi32(
              _mm256_add_epi32(res_a_round, round_const_bits), round_shift_bits);
  
          if (w - j > 4) {
            const __m256i res_b = convolve(s + 4, coeffs_y);
            __m256i res_b_round = _mm256_sra_epi32(
                _mm256_add_epi32(res_b, round_const_y), round_shift_y);
            res_b_round =
                _mm256_sra_epi32(_mm256_add_epi32(res_b_round, round_const_bits),
                                 round_shift_bits);
  
            __m256i res_16bit = _mm256_packs_epi32(res_a_round, res_b_round);
            res_16bit = _mm256_min_epi16(res_16bit, clip_pixel);
            res_16bit = _mm256_max_epi16(res_16bit, zero);
  
            _mm_storeu_si128((__m128i *)&dst[i * dst_stride + j],
                             _mm256_castsi256_si128(res_16bit));
            _mm_storeu_si128((__m128i *)&dst[i * dst_stride + j + dst_stride],
                             _mm256_extracti128_si256(res_16bit, 1));
          } else if (w == 4) {
            res_a_round = _mm256_packs_epi32(res_a_round, res_a_round);
            res_a_round = _mm256_min_epi16(res_a_round, clip_pixel);
            res_a_round = _mm256_max_epi16(res_a_round, zero);
  
            _mm_storel_epi64((__m128i *)&dst[i * dst_stride + j],
                             _mm256_castsi256_si128(res_a_round));
            _mm_storel_epi64((__m128i *)&dst[i * dst_stride + j + dst_stride],
                             _mm256_extracti128_si256(res_a_round, 1));
          } else {
            res_a_round = _mm256_packs_epi32(res_a_round, res_a_round);
            res_a_round = _mm256_min_epi16(res_a_round, clip_pixel);
            res_a_round = _mm256_max_epi16(res_a_round, zero);
  
            xx_storel_32((__m128i *)&dst[i * dst_stride + j],
                         _mm256_castsi256_si128(res_a_round));
            xx_storel_32((__m128i *)&dst[i * dst_stride + j + dst_stride],
                         _mm256_extracti128_si256(res_a_round, 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];
        }
      }
    }
  }
  
  static INLINE void copy_64(const uint16_t *src, uint16_t *dst) {
    __m256i s[4];
    s[0] = _mm256_loadu_si256((__m256i *)(src + 0 * 16));
    s[1] = _mm256_loadu_si256((__m256i *)(src + 1 * 16));
    s[2] = _mm256_loadu_si256((__m256i *)(src + 2 * 16));
    s[3] = _mm256_loadu_si256((__m256i *)(src + 3 * 16));
    _mm256_storeu_si256((__m256i *)(dst + 0 * 16), s[0]);
    _mm256_storeu_si256((__m256i *)(dst + 1 * 16), s[1]);
    _mm256_storeu_si256((__m256i *)(dst + 2 * 16), s[2]);
    _mm256_storeu_si256((__m256i *)(dst + 3 * 16), s[3]);
  }
  
  static INLINE void copy_128(const uint16_t *src, uint16_t *dst) {
    __m256i s[8];
    s[0] = _mm256_loadu_si256((__m256i *)(src + 0 * 16));
    s[1] = _mm256_loadu_si256((__m256i *)(src + 1 * 16));
    s[2] = _mm256_loadu_si256((__m256i *)(src + 2 * 16));
    s[3] = _mm256_loadu_si256((__m256i *)(src + 3 * 16));
    s[4] = _mm256_loadu_si256((__m256i *)(src + 4 * 16));
    s[5] = _mm256_loadu_si256((__m256i *)(src + 5 * 16));
    s[6] = _mm256_loadu_si256((__m256i *)(src + 6 * 16));
    s[7] = _mm256_loadu_si256((__m256i *)(src + 7 * 16));
  
    _mm256_storeu_si256((__m256i *)(dst + 0 * 16), s[0]);
    _mm256_storeu_si256((__m256i *)(dst + 1 * 16), s[1]);
    _mm256_storeu_si256((__m256i *)(dst + 2 * 16), s[2]);
    _mm256_storeu_si256((__m256i *)(dst + 3 * 16), s[3]);
    _mm256_storeu_si256((__m256i *)(dst + 4 * 16), s[4]);
    _mm256_storeu_si256((__m256i *)(dst + 5 * 16), s[5]);
    _mm256_storeu_si256((__m256i *)(dst + 6 * 16), s[6]);
    _mm256_storeu_si256((__m256i *)(dst + 7 * 16), s[7]);
  }
  
  void av1_highbd_convolve_2d_copy_sr_avx2(
      const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride, int w,
      int h, const InterpFilterParams *filter_params_x,
      const InterpFilterParams *filter_params_y, const int subpel_x_q4,
      const int subpel_y_q4, ConvolveParams *conv_params, int bd) {
    (void)filter_params_x;
    (void)filter_params_y;
    (void)subpel_x_q4;
    (void)subpel_y_q4;
    (void)conv_params;
    (void)bd;
  
    if (w >= 16) {
      assert(!((intptr_t)dst % 16));
      assert(!(dst_stride % 16));
    }
  
    if (w == 2) {
      do {
        memmove(dst, src, 2 * sizeof(*src));
        src += src_stride;
        dst += dst_stride;
        memmove(dst, src, 2 * sizeof(*src));
        src += src_stride;
        dst += dst_stride;
        h -= 2;
      } while (h);
    } else if (w == 4) {
      do {
        __m128i s[2];
        s[0] = _mm_loadl_epi64((__m128i *)src);
        src += src_stride;
        s[1] = _mm_loadl_epi64((__m128i *)src);
        src += src_stride;
        _mm_storel_epi64((__m128i *)dst, s[0]);
        dst += dst_stride;
        _mm_storel_epi64((__m128i *)dst, s[1]);
        dst += dst_stride;
        h -= 2;
      } while (h);
    } else if (w == 8) {
      do {
        __m128i s[2];
        s[0] = _mm_loadu_si128((__m128i *)src);
        src += src_stride;
        s[1] = _mm_loadu_si128((__m128i *)src);
        src += src_stride;
        _mm_store_si128((__m128i *)dst, s[0]);
        dst += dst_stride;
        _mm_store_si128((__m128i *)dst, s[1]);
        dst += dst_stride;
        h -= 2;
      } while (h);
    } else if (w == 16) {
      do {
        __m256i s[2];
        s[0] = _mm256_loadu_si256((__m256i *)src);
        src += src_stride;
        s[1] = _mm256_loadu_si256((__m256i *)src);
        src += src_stride;
        _mm256_storeu_si256((__m256i *)dst, s[0]);
        dst += dst_stride;
        _mm256_storeu_si256((__m256i *)dst, s[1]);
        dst += dst_stride;
        h -= 2;
      } while (h);
    } else if (w == 32) {
      do {
        __m256i s[4];
        s[0] = _mm256_loadu_si256((__m256i *)(src + 0 * 16));
        s[1] = _mm256_loadu_si256((__m256i *)(src + 1 * 16));
        src += src_stride;
        s[2] = _mm256_loadu_si256((__m256i *)(src + 0 * 16));
        s[3] = _mm256_loadu_si256((__m256i *)(src + 1 * 16));
        src += src_stride;
        _mm256_storeu_si256((__m256i *)(dst + 0 * 16), s[0]);
        _mm256_storeu_si256((__m256i *)(dst + 1 * 16), s[1]);
        dst += dst_stride;
        _mm256_storeu_si256((__m256i *)(dst + 0 * 16), s[2]);
        _mm256_storeu_si256((__m256i *)(dst + 1 * 16), s[3]);
        dst += dst_stride;
        h -= 2;
      } while (h);
    } else if (w == 64) {
      do {
        copy_64(src, dst);
        src += src_stride;
        dst += dst_stride;
        copy_64(src, dst);
        src += src_stride;
        dst += dst_stride;
        h -= 2;
      } while (h);
    } else {
      do {
        copy_128(src, dst);
        src += src_stride;
        dst += dst_stride;
        copy_128(src, dst);
        src += src_stride;
        dst += dst_stride;
        h -= 2;
      } while (h);
    }
  }
  