/*
 * Copyright (c) 2024, 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 <arm_neon.h>

#include "config/aom_config.h"
#include "config/av1_rtcd.h"

#include "aom_dsp/aom_dsp_common.h"
#include "aom_dsp/arm/aom_neon_sve_bridge.h"
#include "aom_dsp/arm/aom_neon_sve2_bridge.h"
#include "aom_dsp/arm/mem_neon.h"
#include "aom_ports/mem.h"
#include "av1/common/convolve.h"
#include "av1/common/filter.h"
#include "av1/common/filter.h"
#include "av1/common/arm/highbd_compound_convolve_neon.h"
#include "av1/common/arm/highbd_convolve_neon.h"
#include "av1/common/arm/highbd_convolve_sve2.h"

DECLARE_ALIGNED(16, static const uint16_t, kDotProdTbl[32]) = {
  0, 1, 2, 3, 1, 2, 3, 4, 2, 3, 4, 5, 3, 4, 5, 6,
  4, 5, 6, 7, 5, 6, 7, 0, 6, 7, 0, 1, 7, 0, 1, 2,
};

static INLINE uint16x8_t highbd_12_convolve8_8_x(int16x8_t s0[8],
                                                 int16x8_t filter,
                                                 int64x2_t offset) {
  int64x2_t sum[8];
  sum[0] = aom_sdotq_s16(offset, s0[0], filter);
  sum[1] = aom_sdotq_s16(offset, s0[1], filter);
  sum[2] = aom_sdotq_s16(offset, s0[2], filter);
  sum[3] = aom_sdotq_s16(offset, s0[3], filter);
  sum[4] = aom_sdotq_s16(offset, s0[4], filter);
  sum[5] = aom_sdotq_s16(offset, s0[5], filter);
  sum[6] = aom_sdotq_s16(offset, s0[6], filter);
  sum[7] = aom_sdotq_s16(offset, s0[7], filter);

  sum[0] = vpaddq_s64(sum[0], sum[1]);
  sum[2] = vpaddq_s64(sum[2], sum[3]);
  sum[4] = vpaddq_s64(sum[4], sum[5]);
  sum[6] = vpaddq_s64(sum[6], sum[7]);

  int32x4_t sum0123 = vcombine_s32(vmovn_s64(sum[0]), vmovn_s64(sum[2]));
  int32x4_t sum4567 = vcombine_s32(vmovn_s64(sum[4]), vmovn_s64(sum[6]));

  return vcombine_u16(vqrshrun_n_s32(sum0123, ROUND0_BITS + 2),
                      vqrshrun_n_s32(sum4567, ROUND0_BITS + 2));
}

static INLINE void highbd_12_dist_wtd_convolve_x_8tap_sve2(
    const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride,
    int width, int height, const int16_t *x_filter_ptr) {
  const int64x1_t offset_vec =
      vcreate_s64((1 << (12 + FILTER_BITS)) + (1 << (12 + FILTER_BITS - 1)));
  const int64x2_t offset_lo = vcombine_s64(offset_vec, vdup_n_s64(0));

  const int16x8_t filter = vld1q_s16(x_filter_ptr);

  do {
    const int16_t *s = (const int16_t *)src;
    uint16_t *d = dst;
    int w = width;

    do {
      int16x8_t s0[8], s1[8], s2[8], s3[8];
      load_s16_8x8(s + 0 * src_stride, 1, &s0[0], &s0[1], &s0[2], &s0[3],
                   &s0[4], &s0[5], &s0[6], &s0[7]);
      load_s16_8x8(s + 1 * src_stride, 1, &s1[0], &s1[1], &s1[2], &s1[3],
                   &s1[4], &s1[5], &s1[6], &s1[7]);
      load_s16_8x8(s + 2 * src_stride, 1, &s2[0], &s2[1], &s2[2], &s2[3],
                   &s2[4], &s2[5], &s2[6], &s2[7]);
      load_s16_8x8(s + 3 * src_stride, 1, &s3[0], &s3[1], &s3[2], &s3[3],
                   &s3[4], &s3[5], &s3[6], &s3[7]);

      uint16x8_t d0 = highbd_12_convolve8_8_x(s0, filter, offset_lo);
      uint16x8_t d1 = highbd_12_convolve8_8_x(s1, filter, offset_lo);
      uint16x8_t d2 = highbd_12_convolve8_8_x(s2, filter, offset_lo);
      uint16x8_t d3 = highbd_12_convolve8_8_x(s3, filter, offset_lo);

      store_u16_8x4(d, dst_stride, d0, d1, d2, d3);

      s += 8;
      d += 8;
      w -= 8;
    } while (w != 0);
    src += 4 * src_stride;
    dst += 4 * dst_stride;
    height -= 4;
  } while (height != 0);
}

static INLINE uint16x8_t highbd_convolve8_8_x(int16x8_t s0[8], int16x8_t filter,
                                              int64x2_t offset) {
  int64x2_t sum[8];
  sum[0] = aom_sdotq_s16(offset, s0[0], filter);
  sum[1] = aom_sdotq_s16(offset, s0[1], filter);
  sum[2] = aom_sdotq_s16(offset, s0[2], filter);
  sum[3] = aom_sdotq_s16(offset, s0[3], filter);
  sum[4] = aom_sdotq_s16(offset, s0[4], filter);
  sum[5] = aom_sdotq_s16(offset, s0[5], filter);
  sum[6] = aom_sdotq_s16(offset, s0[6], filter);
  sum[7] = aom_sdotq_s16(offset, s0[7], filter);

  sum[0] = vpaddq_s64(sum[0], sum[1]);
  sum[2] = vpaddq_s64(sum[2], sum[3]);
  sum[4] = vpaddq_s64(sum[4], sum[5]);
  sum[6] = vpaddq_s64(sum[6], sum[7]);

  int32x4_t sum0123 = vcombine_s32(vmovn_s64(sum[0]), vmovn_s64(sum[2]));
  int32x4_t sum4567 = vcombine_s32(vmovn_s64(sum[4]), vmovn_s64(sum[6]));

  return vcombine_u16(vqrshrun_n_s32(sum0123, ROUND0_BITS),
                      vqrshrun_n_s32(sum4567, ROUND0_BITS));
}

static INLINE void highbd_dist_wtd_convolve_x_8tap_sve2(
    const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride,
    int width, int height, const int16_t *x_filter_ptr, const int bd) {
  const int64x1_t offset_vec =
      vcreate_s64((1 << (bd + FILTER_BITS)) + (1 << (bd + FILTER_BITS - 1)));
  const int64x2_t offset_lo = vcombine_s64(offset_vec, vdup_n_s64(0));

  const int16x8_t filter = vld1q_s16(x_filter_ptr);

  do {
    const int16_t *s = (const int16_t *)src;
    uint16_t *d = dst;
    int w = width;

    do {
      int16x8_t s0[8], s1[8], s2[8], s3[8];
      load_s16_8x8(s + 0 * src_stride, 1, &s0[0], &s0[1], &s0[2], &s0[3],
                   &s0[4], &s0[5], &s0[6], &s0[7]);
      load_s16_8x8(s + 1 * src_stride, 1, &s1[0], &s1[1], &s1[2], &s1[3],
                   &s1[4], &s1[5], &s1[6], &s1[7]);
      load_s16_8x8(s + 2 * src_stride, 1, &s2[0], &s2[1], &s2[2], &s2[3],
                   &s2[4], &s2[5], &s2[6], &s2[7]);
      load_s16_8x8(s + 3 * src_stride, 1, &s3[0], &s3[1], &s3[2], &s3[3],
                   &s3[4], &s3[5], &s3[6], &s3[7]);

      uint16x8_t d0 = highbd_convolve8_8_x(s0, filter, offset_lo);
      uint16x8_t d1 = highbd_convolve8_8_x(s1, filter, offset_lo);
      uint16x8_t d2 = highbd_convolve8_8_x(s2, filter, offset_lo);
      uint16x8_t d3 = highbd_convolve8_8_x(s3, filter, offset_lo);

      store_u16_8x4(d, dst_stride, d0, d1, d2, d3);

      s += 8;
      d += 8;
      w -= 8;
    } while (w != 0);
    src += 4 * src_stride;
    dst += 4 * dst_stride;
    height -= 4;
  } while (height != 0);
}

// clang-format off
DECLARE_ALIGNED(16, static const uint16_t, kDeinterleaveTbl[8]) = {
  0, 2, 4, 6, 1, 3, 5, 7,
};
// clang-format on

static INLINE uint16x4_t highbd_12_convolve4_4_x(int16x8_t s0, int16x8_t filter,
                                                 int64x2_t offset,
                                                 uint16x8x2_t permute_tbl) {
  int16x8_t permuted_samples0 = aom_tbl_s16(s0, permute_tbl.val[0]);
  int16x8_t permuted_samples1 = aom_tbl_s16(s0, permute_tbl.val[1]);

  int64x2_t sum01 = aom_svdot_lane_s16(offset, permuted_samples0, filter, 0);
  int64x2_t sum23 = aom_svdot_lane_s16(offset, permuted_samples1, filter, 0);

  int32x4_t sum0123 = vcombine_s32(vmovn_s64(sum01), vmovn_s64(sum23));

  return vqrshrun_n_s32(sum0123, ROUND0_BITS + 2);
}

static INLINE uint16x8_t highbd_12_convolve4_8_x(int16x8_t s0[4],
                                                 int16x8_t filter,
                                                 int64x2_t offset,
                                                 uint16x8_t tbl) {
  int64x2_t sum04 = aom_svdot_lane_s16(offset, s0[0], filter, 0);
  int64x2_t sum15 = aom_svdot_lane_s16(offset, s0[1], filter, 0);
  int64x2_t sum26 = aom_svdot_lane_s16(offset, s0[2], filter, 0);
  int64x2_t sum37 = aom_svdot_lane_s16(offset, s0[3], filter, 0);

  int32x4_t sum0415 = vcombine_s32(vmovn_s64(sum04), vmovn_s64(sum15));
  int32x4_t sum2637 = vcombine_s32(vmovn_s64(sum26), vmovn_s64(sum37));

  uint16x8_t res = vcombine_u16(vqrshrun_n_s32(sum0415, ROUND0_BITS + 2),
                                vqrshrun_n_s32(sum2637, ROUND0_BITS + 2));
  return aom_tbl_u16(res, tbl);
}

static INLINE void highbd_12_dist_wtd_convolve_x_4tap_sve2(
    const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride,
    int width, int height, const int16_t *x_filter_ptr) {
  const int64x2_t offset =
      vdupq_n_s64((1 << (12 + FILTER_BITS)) + (1 << (12 + FILTER_BITS - 1)));

  const int16x4_t x_filter = vld1_s16(x_filter_ptr + 2);
  const int16x8_t filter = vcombine_s16(x_filter, vdup_n_s16(0));

  if (width == 4) {
    uint16x8x2_t permute_tbl = vld1q_u16_x2(kDotProdTbl);

    const int16_t *s = (const int16_t *)(src);

    do {
      int16x8_t s0, s1, s2, s3;
      load_s16_8x4(s, src_stride, &s0, &s1, &s2, &s3);

      uint16x4_t d0 = highbd_12_convolve4_4_x(s0, filter, offset, permute_tbl);
      uint16x4_t d1 = highbd_12_convolve4_4_x(s1, filter, offset, permute_tbl);
      uint16x4_t d2 = highbd_12_convolve4_4_x(s2, filter, offset, permute_tbl);
      uint16x4_t d3 = highbd_12_convolve4_4_x(s3, filter, offset, permute_tbl);

      store_u16_4x4(dst, dst_stride, d0, d1, d2, d3);

      s += 4 * src_stride;
      dst += 4 * dst_stride;
      height -= 4;
    } while (height != 0);
  } else {
    uint16x8_t idx = vld1q_u16(kDeinterleaveTbl);

    do {
      const int16_t *s = (const int16_t *)(src);
      uint16_t *d = dst;
      int w = width;

      do {
        int16x8_t s0[4], s1[4], s2[4], s3[4];
        load_s16_8x4(s + 0 * src_stride, 1, &s0[0], &s0[1], &s0[2], &s0[3]);
        load_s16_8x4(s + 1 * src_stride, 1, &s1[0], &s1[1], &s1[2], &s1[3]);
        load_s16_8x4(s + 2 * src_stride, 1, &s2[0], &s2[1], &s2[2], &s2[3]);
        load_s16_8x4(s + 3 * src_stride, 1, &s3[0], &s3[1], &s3[2], &s3[3]);

        uint16x8_t d0 = highbd_12_convolve4_8_x(s0, filter, offset, idx);
        uint16x8_t d1 = highbd_12_convolve4_8_x(s1, filter, offset, idx);
        uint16x8_t d2 = highbd_12_convolve4_8_x(s2, filter, offset, idx);
        uint16x8_t d3 = highbd_12_convolve4_8_x(s3, filter, offset, idx);

        store_u16_8x4(d, dst_stride, d0, d1, d2, d3);

        s += 8;
        d += 8;
        w -= 8;
      } while (w != 0);
      src += 4 * src_stride;
      dst += 4 * dst_stride;
      height -= 4;
    } while (height != 0);
  }
}

static INLINE uint16x4_t highbd_convolve4_4_x(int16x8_t s0, int16x8_t filter,
                                              int64x2_t offset,
                                              uint16x8x2_t permute_tbl) {
  int16x8_t permuted_samples0 = aom_tbl_s16(s0, permute_tbl.val[0]);
  int16x8_t permuted_samples1 = aom_tbl_s16(s0, permute_tbl.val[1]);

  int64x2_t sum01 = aom_svdot_lane_s16(offset, permuted_samples0, filter, 0);
  int64x2_t sum23 = aom_svdot_lane_s16(offset, permuted_samples1, filter, 0);

  int32x4_t sum0123 = vcombine_s32(vmovn_s64(sum01), vmovn_s64(sum23));

  return vqrshrun_n_s32(sum0123, ROUND0_BITS);
}

static INLINE uint16x8_t highbd_convolve4_8_x(int16x8_t s0[4], int16x8_t filter,
                                              int64x2_t offset,
                                              uint16x8_t tbl) {
  int64x2_t sum04 = aom_svdot_lane_s16(offset, s0[0], filter, 0);
  int64x2_t sum15 = aom_svdot_lane_s16(offset, s0[1], filter, 0);
  int64x2_t sum26 = aom_svdot_lane_s16(offset, s0[2], filter, 0);
  int64x2_t sum37 = aom_svdot_lane_s16(offset, s0[3], filter, 0);

  int32x4_t sum0415 = vcombine_s32(vmovn_s64(sum04), vmovn_s64(sum15));
  int32x4_t sum2637 = vcombine_s32(vmovn_s64(sum26), vmovn_s64(sum37));

  uint16x8_t res = vcombine_u16(vqrshrun_n_s32(sum0415, ROUND0_BITS),
                                vqrshrun_n_s32(sum2637, ROUND0_BITS));
  return aom_tbl_u16(res, tbl);
}

static INLINE void highbd_dist_wtd_convolve_x_4tap_sve2(
    const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride,
    int width, int height, const int16_t *x_filter_ptr, const int bd) {
  const int64x2_t offset =
      vdupq_n_s64((1 << (bd + FILTER_BITS)) + (1 << (bd + FILTER_BITS - 1)));

  const int16x4_t x_filter = vld1_s16(x_filter_ptr + 2);
  const int16x8_t filter = vcombine_s16(x_filter, vdup_n_s16(0));

  if (width == 4) {
    uint16x8x2_t permute_tbl = vld1q_u16_x2(kDotProdTbl);

    const int16_t *s = (const int16_t *)(src);

    do {
      int16x8_t s0, s1, s2, s3;
      load_s16_8x4(s, src_stride, &s0, &s1, &s2, &s3);

      uint16x4_t d0 = highbd_convolve4_4_x(s0, filter, offset, permute_tbl);
      uint16x4_t d1 = highbd_convolve4_4_x(s1, filter, offset, permute_tbl);
      uint16x4_t d2 = highbd_convolve4_4_x(s2, filter, offset, permute_tbl);
      uint16x4_t d3 = highbd_convolve4_4_x(s3, filter, offset, permute_tbl);

      store_u16_4x4(dst, dst_stride, d0, d1, d2, d3);

      s += 4 * src_stride;
      dst += 4 * dst_stride;
      height -= 4;
    } while (height != 0);
  } else {
    uint16x8_t idx = vld1q_u16(kDeinterleaveTbl);

    do {
      const int16_t *s = (const int16_t *)(src);
      uint16_t *d = dst;
      int w = width;

      do {
        int16x8_t s0[4], s1[4], s2[4], s3[4];
        load_s16_8x4(s + 0 * src_stride, 1, &s0[0], &s0[1], &s0[2], &s0[3]);
        load_s16_8x4(s + 1 * src_stride, 1, &s1[0], &s1[1], &s1[2], &s1[3]);
        load_s16_8x4(s + 2 * src_stride, 1, &s2[0], &s2[1], &s2[2], &s2[3]);
        load_s16_8x4(s + 3 * src_stride, 1, &s3[0], &s3[1], &s3[2], &s3[3]);

        uint16x8_t d0 = highbd_convolve4_8_x(s0, filter, offset, idx);
        uint16x8_t d1 = highbd_convolve4_8_x(s1, filter, offset, idx);
        uint16x8_t d2 = highbd_convolve4_8_x(s2, filter, offset, idx);
        uint16x8_t d3 = highbd_convolve4_8_x(s3, filter, offset, idx);

        store_u16_8x4(d, dst_stride, d0, d1, d2, d3);

        s += 8;
        d += 8;
        w -= 8;
      } while (w != 0);
      src += 4 * src_stride;
      dst += 4 * dst_stride;
      height -= 4;
    } while (height != 0);
  }
}

void av1_highbd_dist_wtd_convolve_x_sve2(
    const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride, int w,
    int h, const InterpFilterParams *filter_params_x, const int subpel_x_qn,
    ConvolveParams *conv_params, int bd) {
  DECLARE_ALIGNED(16, uint16_t,
                  im_block[(MAX_SB_SIZE + MAX_FILTER_TAP) * MAX_SB_SIZE]);
  CONV_BUF_TYPE *dst16 = conv_params->dst;
  const int x_filter_taps = get_filter_tap(filter_params_x, subpel_x_qn);

  if (x_filter_taps == 6) {
    av1_highbd_dist_wtd_convolve_x_neon(src, src_stride, dst, dst_stride, w, h,
                                        filter_params_x, subpel_x_qn,
                                        conv_params, bd);
    return;
  }

  int dst16_stride = conv_params->dst_stride;
  const int im_stride = MAX_SB_SIZE;
  const int horiz_offset = filter_params_x->taps / 2 - 1;
  assert(FILTER_BITS == COMPOUND_ROUND1_BITS);

  const int16_t *x_filter_ptr = av1_get_interp_filter_subpel_kernel(
      filter_params_x, subpel_x_qn & SUBPEL_MASK);

  src -= horiz_offset;

  if (bd == 12) {
    if (conv_params->do_average) {
      if (x_filter_taps <= 4) {
        highbd_12_dist_wtd_convolve_x_4tap_sve2(src + 2, src_stride, im_block,
                                                im_stride, w, h, x_filter_ptr);
      } else {
        highbd_12_dist_wtd_convolve_x_8tap_sve2(src, src_stride, im_block,
                                                im_stride, w, h, x_filter_ptr);
      }

      if (conv_params->use_dist_wtd_comp_avg) {
        highbd_12_dist_wtd_comp_avg_neon(im_block, im_stride, dst, dst_stride,
                                         w, h, conv_params);

      } else {
        highbd_12_comp_avg_neon(im_block, im_stride, dst, dst_stride, w, h,
                                conv_params);
      }
    } else {
      if (x_filter_taps <= 4) {
        highbd_12_dist_wtd_convolve_x_4tap_sve2(
            src + 2, src_stride, dst16, dst16_stride, w, h, x_filter_ptr);
      } else {
        highbd_12_dist_wtd_convolve_x_8tap_sve2(
            src, src_stride, dst16, dst16_stride, w, h, x_filter_ptr);
      }
    }
  } else {
    if (conv_params->do_average) {
      if (x_filter_taps <= 4) {
        highbd_dist_wtd_convolve_x_4tap_sve2(src + 2, src_stride, im_block,
                                             im_stride, w, h, x_filter_ptr, bd);
      } else {
        highbd_dist_wtd_convolve_x_8tap_sve2(src, src_stride, im_block,
                                             im_stride, w, h, x_filter_ptr, bd);
      }

      if (conv_params->use_dist_wtd_comp_avg) {
        highbd_dist_wtd_comp_avg_neon(im_block, im_stride, dst, dst_stride, w,
                                      h, conv_params, bd);
      } else {
        highbd_comp_avg_neon(im_block, im_stride, dst, dst_stride, w, h,
                             conv_params, bd);
      }
    } else {
      if (x_filter_taps <= 4) {
        highbd_dist_wtd_convolve_x_4tap_sve2(
            src + 2, src_stride, dst16, dst16_stride, w, h, x_filter_ptr, bd);
      } else {
        highbd_dist_wtd_convolve_x_8tap_sve2(
            src, src_stride, dst16, dst16_stride, w, h, x_filter_ptr, bd);
      }
    }
  }
}

static INLINE uint16x4_t highbd_12_convolve8_4_y(int16x8_t samples_lo[2],
                                                 int16x8_t samples_hi[2],
                                                 int16x8_t filter,
                                                 int64x2_t offset) {
  int64x2_t sum01 = aom_svdot_lane_s16(offset, samples_lo[0], filter, 0);
  sum01 = aom_svdot_lane_s16(sum01, samples_hi[0], filter, 1);

  int64x2_t sum23 = aom_svdot_lane_s16(offset, samples_lo[1], filter, 0);
  sum23 = aom_svdot_lane_s16(sum23, samples_hi[1], filter, 1);

  int32x4_t sum0123 = vcombine_s32(vmovn_s64(sum01), vmovn_s64(sum23));

  return vqrshrun_n_s32(sum0123, ROUND0_BITS + 2);
}

static INLINE uint16x8_t highbd_12_convolve8_8_y(int16x8_t samples_lo[4],
                                                 int16x8_t samples_hi[4],
                                                 int16x8_t filter,
                                                 int64x2_t offset) {
  int64x2_t sum01 = aom_svdot_lane_s16(offset, samples_lo[0], filter, 0);
  sum01 = aom_svdot_lane_s16(sum01, samples_hi[0], filter, 1);

  int64x2_t sum23 = aom_svdot_lane_s16(offset, samples_lo[1], filter, 0);
  sum23 = aom_svdot_lane_s16(sum23, samples_hi[1], filter, 1);

  int64x2_t sum45 = aom_svdot_lane_s16(offset, samples_lo[2], filter, 0);
  sum45 = aom_svdot_lane_s16(sum45, samples_hi[2], filter, 1);

  int64x2_t sum67 = aom_svdot_lane_s16(offset, samples_lo[3], filter, 0);
  sum67 = aom_svdot_lane_s16(sum67, samples_hi[3], filter, 1);

  int32x4_t sum0123 = vcombine_s32(vmovn_s64(sum01), vmovn_s64(sum23));
  int32x4_t sum4567 = vcombine_s32(vmovn_s64(sum45), vmovn_s64(sum67));

  return vcombine_u16(vqrshrun_n_s32(sum0123, ROUND0_BITS + 2),
                      vqrshrun_n_s32(sum4567, ROUND0_BITS + 2));
}

static INLINE void highbd_12_dist_wtd_convolve_y_8tap_sve2(
    const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride,
    int width, int height, const int16_t *y_filter_ptr) {
  const int64x2_t offset =
      vdupq_n_s64((1 << (12 + FILTER_BITS)) + (1 << (12 + FILTER_BITS - 1)));
  const int16x8_t y_filter = vld1q_s16(y_filter_ptr);

  uint16x8x3_t merge_block_tbl = vld1q_u16_x3(kDotProdMergeBlockTbl);
  // Scale indices by size of the true vector length to avoid reading from an
  // 'undefined' portion of a vector on a system with SVE vectors > 128-bit.
  uint16x8_t correction0 =
      vreinterpretq_u16_u64(vdupq_n_u64(svcnth() * 0x0001000000000000ULL));
  merge_block_tbl.val[0] = vaddq_u16(merge_block_tbl.val[0], correction0);
  uint16x8_t correction1 =
      vreinterpretq_u16_u64(vdupq_n_u64(svcnth() * 0x0001000100000000ULL));
  merge_block_tbl.val[1] = vaddq_u16(merge_block_tbl.val[1], correction1);

  uint16x8_t correction2 =
      vreinterpretq_u16_u64(vdupq_n_u64(svcnth() * 0x0001000100010000ULL));
  merge_block_tbl.val[2] = vaddq_u16(merge_block_tbl.val[2], correction2);

  if (width == 4) {
    int16_t *s = (int16_t *)src;
    int16x4_t s0, s1, s2, s3, s4, s5, s6;
    load_s16_4x7(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6);
    s += 7 * src_stride;

    // This operation combines a conventional transpose and the sample permute
    // required before computing the dot product.
    int16x8_t s0123[2], s1234[2], s2345[2], s3456[2];
    transpose_concat_4x4(s0, s1, s2, s3, s0123);
    transpose_concat_4x4(s1, s2, s3, s4, s1234);
    transpose_concat_4x4(s2, s3, s4, s5, s2345);
    transpose_concat_4x4(s3, s4, s5, s6, s3456);

    do {
      int16x4_t s7, s8, s9, s10;
      load_s16_4x4(s, src_stride, &s7, &s8, &s9, &s10);

      int16x8_t s4567[2], s5678[2], s6789[2], s789A[2];
      // Transpose and shuffle the 4 lines that were loaded.
      transpose_concat_4x4(s7, s8, s9, s10, s789A);

      // Merge new data into block from previous iteration.
      aom_tbl2x2_s16(s3456, s789A, merge_block_tbl.val[0], s4567);
      aom_tbl2x2_s16(s3456, s789A, merge_block_tbl.val[1], s5678);
      aom_tbl2x2_s16(s3456, s789A, merge_block_tbl.val[2], s6789);

      uint16x4_t d0 = highbd_12_convolve8_4_y(s0123, s4567, y_filter, offset);
      uint16x4_t d1 = highbd_12_convolve8_4_y(s1234, s5678, y_filter, offset);
      uint16x4_t d2 = highbd_12_convolve8_4_y(s2345, s6789, y_filter, offset);
      uint16x4_t d3 = highbd_12_convolve8_4_y(s3456, s789A, y_filter, offset);

      store_u16_4x4(dst, dst_stride, d0, d1, d2, d3);

      // Prepare block for next iteration - re-using as much as possible.
      // Shuffle everything up four rows.
      s0123[0] = s4567[0];
      s0123[1] = s4567[1];
      s1234[0] = s5678[0];
      s1234[1] = s5678[1];
      s2345[0] = s6789[0];
      s2345[1] = s6789[1];
      s3456[0] = s789A[0];
      s3456[1] = s789A[1];

      s += 4 * src_stride;
      dst += 4 * dst_stride;
      height -= 4;
    } while (height != 0);
  } else {
    do {
      int h = height;
      int16_t *s = (int16_t *)src;
      uint16_t *d = dst;

      int16x8_t s0, s1, s2, s3, s4, s5, s6;
      load_s16_8x7(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6);
      s += 7 * src_stride;

      // This operation combines a conventional transpose and the sample permute
      // required before computing the dot product.
      int16x8_t s0123[4], s1234[4], s2345[4], s3456[4];
      transpose_concat_8x4(s0, s1, s2, s3, s0123);
      transpose_concat_8x4(s1, s2, s3, s4, s1234);
      transpose_concat_8x4(s2, s3, s4, s5, s2345);
      transpose_concat_8x4(s3, s4, s5, s6, s3456);

      do {
        int16x8_t s7, s8, s9, s10;
        load_s16_8x4(s, src_stride, &s7, &s8, &s9, &s10);
        int16x8_t s4567[4], s5678[4], s6789[4], s789A[4];

        // Transpose and shuffle the 4 lines that were loaded.
        transpose_concat_8x4(s7, s8, s9, s10, s789A);

        // Merge new data into block from previous iteration.
        aom_tbl2x4_s16(s3456, s789A, merge_block_tbl.val[0], s4567);
        aom_tbl2x4_s16(s3456, s789A, merge_block_tbl.val[1], s5678);
        aom_tbl2x4_s16(s3456, s789A, merge_block_tbl.val[2], s6789);

        uint16x8_t d0 = highbd_12_convolve8_8_y(s0123, s4567, y_filter, offset);
        uint16x8_t d1 = highbd_12_convolve8_8_y(s1234, s5678, y_filter, offset);
        uint16x8_t d2 = highbd_12_convolve8_8_y(s2345, s6789, y_filter, offset);
        uint16x8_t d3 = highbd_12_convolve8_8_y(s3456, s789A, y_filter, offset);

        store_u16_8x4(d, dst_stride, d0, d1, d2, d3);

        // Prepare block for next iteration - re-using as much as possible.
        // Shuffle everything up four rows.
        s0123[0] = s4567[0];
        s0123[1] = s4567[1];
        s0123[2] = s4567[2];
        s0123[3] = s4567[3];
        s1234[0] = s5678[0];
        s1234[1] = s5678[1];
        s1234[2] = s5678[2];
        s1234[3] = s5678[3];
        s2345[0] = s6789[0];
        s2345[1] = s6789[1];
        s2345[2] = s6789[2];
        s2345[3] = s6789[3];
        s3456[0] = s789A[0];
        s3456[1] = s789A[1];
        s3456[2] = s789A[2];
        s3456[3] = s789A[3];

        s += 4 * src_stride;
        d += 4 * dst_stride;
        h -= 4;
      } while (h != 0);
      src += 8;
      dst += 8;
      width -= 8;
    } while (width != 0);
  }
}

static INLINE uint16x4_t highbd_convolve8_4_y(int16x8_t samples_lo[2],
                                              int16x8_t samples_hi[2],
                                              int16x8_t filter,
                                              int64x2_t offset) {
  int64x2_t sum01 = aom_svdot_lane_s16(offset, samples_lo[0], filter, 0);
  sum01 = aom_svdot_lane_s16(sum01, samples_hi[0], filter, 1);

  int64x2_t sum23 = aom_svdot_lane_s16(offset, samples_lo[1], filter, 0);
  sum23 = aom_svdot_lane_s16(sum23, samples_hi[1], filter, 1);

  int32x4_t sum0123 = vcombine_s32(vmovn_s64(sum01), vmovn_s64(sum23));

  return vqrshrun_n_s32(sum0123, ROUND0_BITS);
}

static INLINE uint16x8_t highbd_convolve8_8_y(int16x8_t samples_lo[4],
                                              int16x8_t samples_hi[4],
                                              int16x8_t filter,
                                              int64x2_t offset) {
  int64x2_t sum01 = aom_svdot_lane_s16(offset, samples_lo[0], filter, 0);
  sum01 = aom_svdot_lane_s16(sum01, samples_hi[0], filter, 1);

  int64x2_t sum23 = aom_svdot_lane_s16(offset, samples_lo[1], filter, 0);
  sum23 = aom_svdot_lane_s16(sum23, samples_hi[1], filter, 1);

  int64x2_t sum45 = aom_svdot_lane_s16(offset, samples_lo[2], filter, 0);
  sum45 = aom_svdot_lane_s16(sum45, samples_hi[2], filter, 1);

  int64x2_t sum67 = aom_svdot_lane_s16(offset, samples_lo[3], filter, 0);
  sum67 = aom_svdot_lane_s16(sum67, samples_hi[3], filter, 1);

  int32x4_t sum0123 = vcombine_s32(vmovn_s64(sum01), vmovn_s64(sum23));
  int32x4_t sum4567 = vcombine_s32(vmovn_s64(sum45), vmovn_s64(sum67));

  return vcombine_u16(vqrshrun_n_s32(sum0123, ROUND0_BITS),
                      vqrshrun_n_s32(sum4567, ROUND0_BITS));
}

static INLINE void highbd_dist_wtd_convolve_y_8tap_sve2(
    const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride,
    int width, int height, const int16_t *y_filter_ptr, const int bd) {
  const int64x2_t offset =
      vdupq_n_s64((1 << (bd + FILTER_BITS)) + (1 << (bd + FILTER_BITS - 1)));
  const int16x8_t y_filter = vld1q_s16(y_filter_ptr);

  uint16x8x3_t merge_block_tbl = vld1q_u16_x3(kDotProdMergeBlockTbl);
  // Scale indices by size of the true vector length to avoid reading from an
  // 'undefined' portion of a vector on a system with SVE vectors > 128-bit.
  uint16x8_t correction0 =
      vreinterpretq_u16_u64(vdupq_n_u64(svcnth() * 0x0001000000000000ULL));
  merge_block_tbl.val[0] = vaddq_u16(merge_block_tbl.val[0], correction0);
  uint16x8_t correction1 =
      vreinterpretq_u16_u64(vdupq_n_u64(svcnth() * 0x0001000100000000ULL));
  merge_block_tbl.val[1] = vaddq_u16(merge_block_tbl.val[1], correction1);

  uint16x8_t correction2 =
      vreinterpretq_u16_u64(vdupq_n_u64(svcnth() * 0x0001000100010000ULL));
  merge_block_tbl.val[2] = vaddq_u16(merge_block_tbl.val[2], correction2);

  if (width == 4) {
    int16_t *s = (int16_t *)src;
    int16x4_t s0, s1, s2, s3, s4, s5, s6;
    load_s16_4x7(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6);
    s += 7 * src_stride;

    // This operation combines a conventional transpose and the sample permute
    // required before computing the dot product.
    int16x8_t s0123[2], s1234[2], s2345[2], s3456[2];
    transpose_concat_4x4(s0, s1, s2, s3, s0123);
    transpose_concat_4x4(s1, s2, s3, s4, s1234);
    transpose_concat_4x4(s2, s3, s4, s5, s2345);
    transpose_concat_4x4(s3, s4, s5, s6, s3456);

    do {
      int16x4_t s7, s8, s9, s10;
      load_s16_4x4(s, src_stride, &s7, &s8, &s9, &s10);

      int16x8_t s4567[2], s5678[2], s6789[2], s789A[2];
      // Transpose and shuffle the 4 lines that were loaded.
      transpose_concat_4x4(s7, s8, s9, s10, s789A);

      // Merge new data into block from previous iteration.
      aom_tbl2x2_s16(s3456, s789A, merge_block_tbl.val[0], s4567);
      aom_tbl2x2_s16(s3456, s789A, merge_block_tbl.val[1], s5678);
      aom_tbl2x2_s16(s3456, s789A, merge_block_tbl.val[2], s6789);

      uint16x4_t d0 = highbd_convolve8_4_y(s0123, s4567, y_filter, offset);
      uint16x4_t d1 = highbd_convolve8_4_y(s1234, s5678, y_filter, offset);
      uint16x4_t d2 = highbd_convolve8_4_y(s2345, s6789, y_filter, offset);
      uint16x4_t d3 = highbd_convolve8_4_y(s3456, s789A, y_filter, offset);

      store_u16_4x4(dst, dst_stride, d0, d1, d2, d3);

      // Prepare block for next iteration - re-using as much as possible.
      // Shuffle everything up four rows.
      s0123[0] = s4567[0];
      s0123[1] = s4567[1];
      s1234[0] = s5678[0];
      s1234[1] = s5678[1];
      s2345[0] = s6789[0];
      s2345[1] = s6789[1];
      s3456[0] = s789A[0];
      s3456[1] = s789A[1];

      s += 4 * src_stride;
      dst += 4 * dst_stride;
      height -= 4;
    } while (height != 0);
  } else {
    do {
      int h = height;
      int16_t *s = (int16_t *)src;
      uint16_t *d = dst;

      int16x8_t s0, s1, s2, s3, s4, s5, s6;
      load_s16_8x7(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6);
      s += 7 * src_stride;

      // This operation combines a conventional transpose and the sample permute
      // required before computing the dot product.
      int16x8_t s0123[4], s1234[4], s2345[4], s3456[4];
      transpose_concat_8x4(s0, s1, s2, s3, s0123);
      transpose_concat_8x4(s1, s2, s3, s4, s1234);
      transpose_concat_8x4(s2, s3, s4, s5, s2345);
      transpose_concat_8x4(s3, s4, s5, s6, s3456);

      do {
        int16x8_t s7, s8, s9, s10;
        load_s16_8x4(s, src_stride, &s7, &s8, &s9, &s10);
        int16x8_t s4567[4], s5678[4], s6789[4], s789A[4];

        // Transpose and shuffle the 4 lines that were loaded.
        transpose_concat_8x4(s7, s8, s9, s10, s789A);

        // Merge new data into block from previous iteration.
        aom_tbl2x4_s16(s3456, s789A, merge_block_tbl.val[0], s4567);
        aom_tbl2x4_s16(s3456, s789A, merge_block_tbl.val[1], s5678);
        aom_tbl2x4_s16(s3456, s789A, merge_block_tbl.val[2], s6789);

        uint16x8_t d0 = highbd_convolve8_8_y(s0123, s4567, y_filter, offset);
        uint16x8_t d1 = highbd_convolve8_8_y(s1234, s5678, y_filter, offset);
        uint16x8_t d2 = highbd_convolve8_8_y(s2345, s6789, y_filter, offset);
        uint16x8_t d3 = highbd_convolve8_8_y(s3456, s789A, y_filter, offset);

        store_u16_8x4(d, dst_stride, d0, d1, d2, d3);

        // Prepare block for next iteration - re-using as much as possible.
        // Shuffle everything up four rows.
        s0123[0] = s4567[0];
        s0123[1] = s4567[1];
        s0123[2] = s4567[2];
        s0123[3] = s4567[3];
        s1234[0] = s5678[0];
        s1234[1] = s5678[1];
        s1234[2] = s5678[2];
        s1234[3] = s5678[3];
        s2345[0] = s6789[0];
        s2345[1] = s6789[1];
        s2345[2] = s6789[2];
        s2345[3] = s6789[3];
        s3456[0] = s789A[0];
        s3456[1] = s789A[1];
        s3456[2] = s789A[2];
        s3456[3] = s789A[3];

        s += 4 * src_stride;
        d += 4 * dst_stride;
        h -= 4;
      } while (h != 0);
      src += 8;
      dst += 8;
      width -= 8;
    } while (width != 0);
  }
}

void av1_highbd_dist_wtd_convolve_y_sve2(
    const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride, int w,
    int h, const InterpFilterParams *filter_params_y, const int subpel_y_qn,
    ConvolveParams *conv_params, int bd) {
  DECLARE_ALIGNED(16, uint16_t,
                  im_block[(MAX_SB_SIZE + MAX_FILTER_TAP) * MAX_SB_SIZE]);
  CONV_BUF_TYPE *dst16 = conv_params->dst;
  const int y_filter_taps = get_filter_tap(filter_params_y, subpel_y_qn);

  if (y_filter_taps != 8) {
    av1_highbd_dist_wtd_convolve_y_neon(src, src_stride, dst, dst_stride, w, h,
                                        filter_params_y, subpel_y_qn,
                                        conv_params, bd);
    return;
  }

  int dst16_stride = conv_params->dst_stride;
  const int im_stride = MAX_SB_SIZE;
  const int vert_offset = filter_params_y->taps / 2 - 1;
  assert(FILTER_BITS == COMPOUND_ROUND1_BITS);

  const int16_t *y_filter_ptr = av1_get_interp_filter_subpel_kernel(
      filter_params_y, subpel_y_qn & SUBPEL_MASK);

  src -= vert_offset * src_stride;

  if (bd == 12) {
    if (conv_params->do_average) {
      highbd_12_dist_wtd_convolve_y_8tap_sve2(src, src_stride, im_block,
                                              im_stride, w, h, y_filter_ptr);
      if (conv_params->use_dist_wtd_comp_avg) {
        highbd_12_dist_wtd_comp_avg_neon(im_block, im_stride, dst, dst_stride,
                                         w, h, conv_params);
      } else {
        highbd_12_comp_avg_neon(im_block, im_stride, dst, dst_stride, w, h,
                                conv_params);
      }
    } else {
      highbd_12_dist_wtd_convolve_y_8tap_sve2(src, src_stride, dst16,
                                              dst16_stride, w, h, y_filter_ptr);
    }
  } else {
    if (conv_params->do_average) {
      highbd_dist_wtd_convolve_y_8tap_sve2(src, src_stride, im_block, im_stride,
                                           w, h, y_filter_ptr, bd);
      if (conv_params->use_dist_wtd_comp_avg) {
        highbd_dist_wtd_comp_avg_neon(im_block, im_stride, dst, dst_stride, w,
                                      h, conv_params, bd);
      } else {
        highbd_comp_avg_neon(im_block, im_stride, dst, dst_stride, w, h,
                             conv_params, bd);
      }
    } else {
      highbd_dist_wtd_convolve_y_8tap_sve2(src, src_stride, dst16, dst16_stride,
                                           w, h, y_filter_ptr, bd);
    }
  }
}

static INLINE void highbd_12_dist_wtd_convolve_2d_horiz_8tap_sve2(
    const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride,
    int width, int height, const int16_t *x_filter_ptr) {
  const int64x2_t offset = vdupq_n_s64(1 << (12 + FILTER_BITS - 2));
  const int16x8_t filter = vld1q_s16(x_filter_ptr);

  // We are only doing 8-tap and 4-tap vertical convolutions, therefore we know
  // that im_h % 4 = 3, so we can do the loop across the whole block 4 rows at
  // a time and then process the last 3 rows separately.

  do {
    const int16_t *s = (const int16_t *)src;
    uint16_t *d = dst;
    int w = width;

    do {
      int16x8_t s0[8], s1[8], s2[8], s3[8];
      load_s16_8x8(s + 0 * src_stride, 1, &s0[0], &s0[1], &s0[2], &s0[3],
                   &s0[4], &s0[5], &s0[6], &s0[7]);
      load_s16_8x8(s + 1 * src_stride, 1, &s1[0], &s1[1], &s1[2], &s1[3],
                   &s1[4], &s1[5], &s1[6], &s1[7]);
      load_s16_8x8(s + 2 * src_stride, 1, &s2[0], &s2[1], &s2[2], &s2[3],
                   &s2[4], &s2[5], &s2[6], &s2[7]);
      load_s16_8x8(s + 3 * src_stride, 1, &s3[0], &s3[1], &s3[2], &s3[3],
                   &s3[4], &s3[5], &s3[6], &s3[7]);

      uint16x8_t d0 = highbd_12_convolve8_8_x(s0, filter, offset);
      uint16x8_t d1 = highbd_12_convolve8_8_x(s1, filter, offset);
      uint16x8_t d2 = highbd_12_convolve8_8_x(s2, filter, offset);
      uint16x8_t d3 = highbd_12_convolve8_8_x(s3, filter, offset);

      store_u16_8x4(d, dst_stride, d0, d1, d2, d3);

      s += 8;
      d += 8;
      w -= 8;
    } while (w != 0);
    src += 4 * src_stride;
    dst += 4 * dst_stride;
    height -= 4;
  } while (height > 4);

  // Process final 3 rows.
  const int16_t *s = (const int16_t *)src;
  do {
    int16x8_t s0[8], s1[8], s2[8];
    load_s16_8x8(s + 0 * src_stride, 1, &s0[0], &s0[1], &s0[2], &s0[3], &s0[4],
                 &s0[5], &s0[6], &s0[7]);
    load_s16_8x8(s + 1 * src_stride, 1, &s1[0], &s1[1], &s1[2], &s1[3], &s1[4],
                 &s1[5], &s1[6], &s1[7]);
    load_s16_8x8(s + 2 * src_stride, 1, &s2[0], &s2[1], &s2[2], &s2[3], &s2[4],
                 &s2[5], &s2[6], &s2[7]);

    uint16x8_t d0 = highbd_12_convolve8_8_x(s0, filter, offset);
    uint16x8_t d1 = highbd_12_convolve8_8_x(s1, filter, offset);
    uint16x8_t d2 = highbd_12_convolve8_8_x(s2, filter, offset);

    store_u16_8x3(dst, dst_stride, d0, d1, d2);
    s += 8;
    dst += 8;
    width -= 8;
  } while (width != 0);
}

static INLINE void highbd_dist_wtd_convolve_2d_horiz_8tap_sve2(
    const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride,
    int width, int height, const int16_t *x_filter_ptr, const int bd) {
  const int64x2_t offset = vdupq_n_s64(1 << (bd + FILTER_BITS - 2));
  const int16x8_t filter = vld1q_s16(x_filter_ptr);

  // We are only doing 8-tap and 4-tap vertical convolutions, therefore we know
  // that im_h % 4 = 3, so we can do the loop across the whole block 4 rows at
  // a time and then process the last 3 rows separately.

  do {
    const int16_t *s = (const int16_t *)src;
    uint16_t *d = dst;
    int w = width;

    do {
      int16x8_t s0[8], s1[8], s2[8], s3[8];
      load_s16_8x8(s + 0 * src_stride, 1, &s0[0], &s0[1], &s0[2], &s0[3],
                   &s0[4], &s0[5], &s0[6], &s0[7]);
      load_s16_8x8(s + 1 * src_stride, 1, &s1[0], &s1[1], &s1[2], &s1[3],
                   &s1[4], &s1[5], &s1[6], &s1[7]);
      load_s16_8x8(s + 2 * src_stride, 1, &s2[0], &s2[1], &s2[2], &s2[3],
                   &s2[4], &s2[5], &s2[6], &s2[7]);
      load_s16_8x8(s + 3 * src_stride, 1, &s3[0], &s3[1], &s3[2], &s3[3],
                   &s3[4], &s3[5], &s3[6], &s3[7]);

      uint16x8_t d0 = highbd_convolve8_8_x(s0, filter, offset);
      uint16x8_t d1 = highbd_convolve8_8_x(s1, filter, offset);
      uint16x8_t d2 = highbd_convolve8_8_x(s2, filter, offset);
      uint16x8_t d3 = highbd_convolve8_8_x(s3, filter, offset);

      store_u16_8x4(d, dst_stride, d0, d1, d2, d3);

      s += 8;
      d += 8;
      w -= 8;
    } while (w != 0);
    src += 4 * src_stride;
    dst += 4 * dst_stride;
    height -= 4;
  } while (height > 4);

  // Process final 3 rows.
  const int16_t *s = (const int16_t *)src;
  do {
    int16x8_t s0[8], s1[8], s2[8];
    load_s16_8x8(s + 0 * src_stride, 1, &s0[0], &s0[1], &s0[2], &s0[3], &s0[4],
                 &s0[5], &s0[6], &s0[7]);
    load_s16_8x8(s + 1 * src_stride, 1, &s1[0], &s1[1], &s1[2], &s1[3], &s1[4],
                 &s1[5], &s1[6], &s1[7]);
    load_s16_8x8(s + 2 * src_stride, 1, &s2[0], &s2[1], &s2[2], &s2[3], &s2[4],
                 &s2[5], &s2[6], &s2[7]);

    uint16x8_t d0 = highbd_convolve8_8_x(s0, filter, offset);
    uint16x8_t d1 = highbd_convolve8_8_x(s1, filter, offset);
    uint16x8_t d2 = highbd_convolve8_8_x(s2, filter, offset);

    store_u16_8x3(dst, dst_stride, d0, d1, d2);
    s += 8;
    dst += 8;
    width -= 8;
  } while (width != 0);
}

static INLINE uint16x4_t highbd_convolve4_4_2d_h(int16x8_t s0, int16x8_t filter,
                                                 int64x2_t offset,
                                                 int32x4_t shift,
                                                 uint16x8x2_t permute_tbl) {
  int16x8_t permuted_samples0 = aom_tbl_s16(s0, permute_tbl.val[0]);
  int16x8_t permuted_samples1 = aom_tbl_s16(s0, permute_tbl.val[1]);

  int64x2_t sum01 = aom_svdot_lane_s16(offset, permuted_samples0, filter, 0);
  int64x2_t sum23 = aom_svdot_lane_s16(offset, permuted_samples1, filter, 0);

  int32x4_t sum0123 = vcombine_s32(vmovn_s64(sum01), vmovn_s64(sum23));
  sum0123 = vshlq_s32(sum0123, shift);

  return vqmovun_s32(sum0123);
}

static INLINE uint16x8_t highbd_convolve4_8_2d_h(int16x8_t s0[4],
                                                 int16x8_t filter,
                                                 int64x2_t offset,
                                                 int32x4_t shift,
                                                 uint16x8_t tbl) {
  int64x2_t sum04 = aom_svdot_lane_s16(offset, s0[0], filter, 0);
  int64x2_t sum15 = aom_svdot_lane_s16(offset, s0[1], filter, 0);
  int64x2_t sum26 = aom_svdot_lane_s16(offset, s0[2], filter, 0);
  int64x2_t sum37 = aom_svdot_lane_s16(offset, s0[3], filter, 0);

  int32x4_t sum0415 = vcombine_s32(vmovn_s64(sum04), vmovn_s64(sum15));
  sum0415 = vshlq_s32(sum0415, shift);

  int32x4_t sum2637 = vcombine_s32(vmovn_s64(sum26), vmovn_s64(sum37));
  sum2637 = vshlq_s32(sum2637, shift);

  uint16x8_t res = vcombine_u16(vqmovun_s32(sum0415), vqmovun_s32(sum2637));
  return aom_tbl_u16(res, tbl);
}

static INLINE void highbd_dist_wtd_convolve_2d_horiz_4tap_sve2(
    const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride,
    int width, int height, const int16_t *x_filter_ptr,
    ConvolveParams *conv_params, const int bd) {
  const int64x2_t offset = vdupq_n_s64((1 << (bd + FILTER_BITS - 1)) +
                                       (1 << (conv_params->round_0 - 1)));
  const int32x4_t shift = vdupq_n_s32(-conv_params->round_0);
  const int16x4_t x_filter = vld1_s16(x_filter_ptr + 2);
  const int16x8_t filter = vcombine_s16(x_filter, vdup_n_s16(0));

  // We are only doing 8-tap and 4-tap vertical convolutions, therefore we know
  // that im_h % 4 = 3, so we can do the loop across the whole block 4 rows at
  // a time and then process the last 3 rows separately.

  if (width == 4) {
    uint16x8x2_t permute_tbl = vld1q_u16_x2(kDotProdTbl);

    const int16_t *s = (const int16_t *)(src);

    do {
      int16x8_t s0, s1, s2, s3;
      load_s16_8x4(s, src_stride, &s0, &s1, &s2, &s3);

      uint16x4_t d0 =
          highbd_convolve4_4_2d_h(s0, filter, offset, shift, permute_tbl);
      uint16x4_t d1 =
          highbd_convolve4_4_2d_h(s1, filter, offset, shift, permute_tbl);
      uint16x4_t d2 =
          highbd_convolve4_4_2d_h(s2, filter, offset, shift, permute_tbl);
      uint16x4_t d3 =
          highbd_convolve4_4_2d_h(s3, filter, offset, shift, permute_tbl);

      store_u16_4x4(dst, dst_stride, d0, d1, d2, d3);

      s += 4 * src_stride;
      dst += 4 * dst_stride;
      height -= 4;
    } while (height > 4);

    // Process final 3 rows.
    int16x8_t s0, s1, s2;
    load_s16_8x3(s, src_stride, &s0, &s1, &s2);

    uint16x4_t d0 =
        highbd_convolve4_4_2d_h(s0, filter, offset, shift, permute_tbl);
    uint16x4_t d1 =
        highbd_convolve4_4_2d_h(s1, filter, offset, shift, permute_tbl);
    uint16x4_t d2 =
        highbd_convolve4_4_2d_h(s2, filter, offset, shift, permute_tbl);

    store_u16_4x3(dst, dst_stride, d0, d1, d2);

  } else {
    uint16x8_t idx = vld1q_u16(kDeinterleaveTbl);

    do {
      const int16_t *s = (const int16_t *)(src);
      uint16_t *d = dst;
      int w = width;

      do {
        int16x8_t s0[4], s1[4], s2[4], s3[4];
        load_s16_8x4(s + 0 * src_stride, 1, &s0[0], &s0[1], &s0[2], &s0[3]);
        load_s16_8x4(s + 1 * src_stride, 1, &s1[0], &s1[1], &s1[2], &s1[3]);
        load_s16_8x4(s + 2 * src_stride, 1, &s2[0], &s2[1], &s2[2], &s2[3]);
        load_s16_8x4(s + 3 * src_stride, 1, &s3[0], &s3[1], &s3[2], &s3[3]);

        uint16x8_t d0 = highbd_convolve4_8_2d_h(s0, filter, offset, shift, idx);
        uint16x8_t d1 = highbd_convolve4_8_2d_h(s1, filter, offset, shift, idx);
        uint16x8_t d2 = highbd_convolve4_8_2d_h(s2, filter, offset, shift, idx);
        uint16x8_t d3 = highbd_convolve4_8_2d_h(s3, filter, offset, shift, idx);

        store_u16_8x4(d, dst_stride, d0, d1, d2, d3);

        s += 8;
        d += 8;
        w -= 8;
      } while (w != 0);
      src += 4 * src_stride;
      dst += 4 * dst_stride;
      height -= 4;
    } while (height > 4);

    // Process final 3 rows.
    const int16_t *s = (const int16_t *)(src);

    do {
      int16x8_t s0[4], s1[4], s2[4];
      load_s16_8x4(s + 0 * src_stride, 1, &s0[0], &s0[1], &s0[2], &s0[3]);
      load_s16_8x4(s + 1 * src_stride, 1, &s1[0], &s1[1], &s1[2], &s1[3]);
      load_s16_8x4(s + 2 * src_stride, 1, &s2[0], &s2[1], &s2[2], &s2[3]);

      uint16x8_t d0 = highbd_convolve4_8_2d_h(s0, filter, offset, shift, idx);
      uint16x8_t d1 = highbd_convolve4_8_2d_h(s1, filter, offset, shift, idx);
      uint16x8_t d2 = highbd_convolve4_8_2d_h(s2, filter, offset, shift, idx);

      store_u16_8x3(dst, dst_stride, d0, d1, d2);

      s += 8;
      dst += 8;
      width -= 8;
    } while (width != 0);
  }
}

static INLINE uint16x4_t highbd_convolve8_4_2d_v(int16x8_t samples_lo[2],
                                                 int16x8_t samples_hi[2],
                                                 int16x8_t filter,
                                                 int64x2_t offset) {
  int64x2_t sum01 = aom_svdot_lane_s16(offset, samples_lo[0], filter, 0);
  sum01 = aom_svdot_lane_s16(sum01, samples_hi[0], filter, 1);

  int64x2_t sum23 = aom_svdot_lane_s16(offset, samples_lo[1], filter, 0);
  sum23 = aom_svdot_lane_s16(sum23, samples_hi[1], filter, 1);

  int32x4_t sum0123 = vcombine_s32(vmovn_s64(sum01), vmovn_s64(sum23));

  return vqrshrun_n_s32(sum0123, COMPOUND_ROUND1_BITS);
}

static INLINE uint16x8_t highbd_convolve8_8_2d_v(int16x8_t samples_lo[4],
                                                 int16x8_t samples_hi[4],
                                                 int16x8_t filter,
                                                 int64x2_t offset) {
  int64x2_t sum01 = aom_svdot_lane_s16(offset, samples_lo[0], filter, 0);
  sum01 = aom_svdot_lane_s16(sum01, samples_hi[0], filter, 1);

  int64x2_t sum23 = aom_svdot_lane_s16(offset, samples_lo[1], filter, 0);
  sum23 = aom_svdot_lane_s16(sum23, samples_hi[1], filter, 1);

  int64x2_t sum45 = aom_svdot_lane_s16(offset, samples_lo[2], filter, 0);
  sum45 = aom_svdot_lane_s16(sum45, samples_hi[2], filter, 1);

  int64x2_t sum67 = aom_svdot_lane_s16(offset, samples_lo[3], filter, 0);
  sum67 = aom_svdot_lane_s16(sum67, samples_hi[3], filter, 1);

  int32x4_t sum0123 = vcombine_s32(vmovn_s64(sum01), vmovn_s64(sum23));
  int32x4_t sum4567 = vcombine_s32(vmovn_s64(sum45), vmovn_s64(sum67));

  return vcombine_u16(vqrshrun_n_s32(sum0123, COMPOUND_ROUND1_BITS),
                      vqrshrun_n_s32(sum4567, COMPOUND_ROUND1_BITS));
}

static INLINE void highbd_dist_wtd_convolve_2d_vert_8tap_sve2(
    const uint16_t *src, int src_stride, uint16_t *dst, int dst_stride,
    int width, int height, const int16_t *y_filter_ptr, int offset) {
  const int16x8_t y_filter = vld1q_s16(y_filter_ptr);
  const int64x2_t offset_s64 = vdupq_n_s64(offset);

  uint16x8x3_t merge_block_tbl = vld1q_u16_x3(kDotProdMergeBlockTbl);
  // Scale indices by size of the true vector length to avoid reading from an
  // 'undefined' portion of a vector on a system with SVE vectors > 128-bit.
  uint16x8_t correction0 =
      vreinterpretq_u16_u64(vdupq_n_u64(svcnth() * 0x0001000000000000ULL));
  merge_block_tbl.val[0] = vaddq_u16(merge_block_tbl.val[0], correction0);

  uint16x8_t correction1 =
      vreinterpretq_u16_u64(vdupq_n_u64(svcnth() * 0x0001000100000000ULL));
  merge_block_tbl.val[1] = vaddq_u16(merge_block_tbl.val[1], correction1);

  uint16x8_t correction2 =
      vreinterpretq_u16_u64(vdupq_n_u64(svcnth() * 0x0001000100010000ULL));
  merge_block_tbl.val[2] = vaddq_u16(merge_block_tbl.val[2], correction2);

  if (width == 4) {
    int16_t *s = (int16_t *)src;
    int16x4_t s0, s1, s2, s3, s4, s5, s6;
    load_s16_4x7(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6);
    s += 7 * src_stride;

    // This operation combines a conventional transpose and the sample permute
    // required before computing the dot product.
    int16x8_t s0123[2], s1234[2], s2345[2], s3456[2];
    transpose_concat_4x4(s0, s1, s2, s3, s0123);
    transpose_concat_4x4(s1, s2, s3, s4, s1234);
    transpose_concat_4x4(s2, s3, s4, s5, s2345);
    transpose_concat_4x4(s3, s4, s5, s6, s3456);

    do {
      int16x4_t s7, s8, s9, s10;
      load_s16_4x4(s, src_stride, &s7, &s8, &s9, &s10);

      int16x8_t s4567[2], s5678[2], s6789[2], s789A[2];
      // Transpose and shuffle the 4 lines that were loaded.
      transpose_concat_4x4(s7, s8, s9, s10, s789A);

      // Merge new data into block from previous iteration.
      aom_tbl2x2_s16(s3456, s789A, merge_block_tbl.val[0], s4567);
      aom_tbl2x2_s16(s3456, s789A, merge_block_tbl.val[1], s5678);
      aom_tbl2x2_s16(s3456, s789A, merge_block_tbl.val[2], s6789);

      uint16x4_t d0 =
          highbd_convolve8_4_2d_v(s0123, s4567, y_filter, offset_s64);
      uint16x4_t d1 =
          highbd_convolve8_4_2d_v(s1234, s5678, y_filter, offset_s64);
      uint16x4_t d2 =
          highbd_convolve8_4_2d_v(s2345, s6789, y_filter, offset_s64);
      uint16x4_t d3 =
          highbd_convolve8_4_2d_v(s3456, s789A, y_filter, offset_s64);

      store_u16_4x4(dst, dst_stride, d0, d1, d2, d3);

      // Prepare block for next iteration - re-using as much as possible.
      // Shuffle everything up four rows.
      s0123[0] = s4567[0];
      s0123[1] = s4567[1];
      s1234[0] = s5678[0];
      s1234[1] = s5678[1];
      s2345[0] = s6789[0];
      s2345[1] = s6789[1];
      s3456[0] = s789A[0];
      s3456[1] = s789A[1];

      s += 4 * src_stride;
      dst += 4 * dst_stride;
      height -= 4;
    } while (height != 0);
  } else {
    do {
      int h = height;
      int16_t *s = (int16_t *)src;
      uint16_t *d = dst;

      int16x8_t s0, s1, s2, s3, s4, s5, s6;
      load_s16_8x7(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6);
      s += 7 * src_stride;

      // This operation combines a conventional transpose and the sample permute
      // required before computing the dot product.
      int16x8_t s0123[4], s1234[4], s2345[4], s3456[4];
      transpose_concat_8x4(s0, s1, s2, s3, s0123);
      transpose_concat_8x4(s1, s2, s3, s4, s1234);
      transpose_concat_8x4(s2, s3, s4, s5, s2345);
      transpose_concat_8x4(s3, s4, s5, s6, s3456);

      do {
        int16x8_t s7, s8, s9, s10;
        load_s16_8x4(s, src_stride, &s7, &s8, &s9, &s10);
        int16x8_t s4567[4], s5678[4], s6789[4], s789A[4];

        // Transpose and shuffle the 4 lines that were loaded.
        transpose_concat_8x4(s7, s8, s9, s10, s789A);

        // Merge new data into block from previous iteration.
        aom_tbl2x4_s16(s3456, s789A, merge_block_tbl.val[0], s4567);
        aom_tbl2x4_s16(s3456, s789A, merge_block_tbl.val[1], s5678);
        aom_tbl2x4_s16(s3456, s789A, merge_block_tbl.val[2], s6789);

        uint16x8_t d0 =
            highbd_convolve8_8_2d_v(s0123, s4567, y_filter, offset_s64);
        uint16x8_t d1 =
            highbd_convolve8_8_2d_v(s1234, s5678, y_filter, offset_s64);
        uint16x8_t d2 =
            highbd_convolve8_8_2d_v(s2345, s6789, y_filter, offset_s64);
        uint16x8_t d3 =
            highbd_convolve8_8_2d_v(s3456, s789A, y_filter, offset_s64);

        store_u16_8x4(d, dst_stride, d0, d1, d2, d3);

        // Prepare block for next iteration - re-using as much as possible.
        // Shuffle everything up four rows.
        s0123[0] = s4567[0];
        s0123[1] = s4567[1];
        s0123[2] = s4567[2];
        s0123[3] = s4567[3];
        s1234[0] = s5678[0];
        s1234[1] = s5678[1];
        s1234[2] = s5678[2];
        s1234[3] = s5678[3];
        s2345[0] = s6789[0];
        s2345[1] = s6789[1];
        s2345[2] = s6789[2];
        s2345[3] = s6789[3];
        s3456[0] = s789A[0];
        s3456[1] = s789A[1];
        s3456[2] = s789A[2];
        s3456[3] = s789A[3];

        s += 4 * src_stride;
        d += 4 * dst_stride;
        h -= 4;
      } while (h != 0);
      src += 8;
      dst += 8;
      width -= 8;
    } while (width != 0);
  }
}

static INLINE uint16x4_t highbd_convolve4_4_2d_v(
    const int16x4_t s0, const int16x4_t s1, const int16x4_t s2,
    const int16x4_t s3, const int16x4_t filter, const int32x4_t offset) {
  int32x4_t sum = vmlal_lane_s16(offset, s0, filter, 0);
  sum = vmlal_lane_s16(sum, s1, filter, 1);
  sum = vmlal_lane_s16(sum, s2, filter, 2);
  sum = vmlal_lane_s16(sum, s3, filter, 3);

  return vqrshrun_n_s32(sum, COMPOUND_ROUND1_BITS);
}

static INLINE uint16x8_t highbd_convolve4_8_2d_v(
    const int16x8_t s0, const int16x8_t s1, const int16x8_t s2,
    const int16x8_t s3, const int16x4_t filter, const int32x4_t offset) {
  int32x4_t sum0 = vmlal_lane_s16(offset, vget_low_s16(s0), filter, 0);
  sum0 = vmlal_lane_s16(sum0, vget_low_s16(s1), filter, 1);
  sum0 = vmlal_lane_s16(sum0, vget_low_s16(s2), filter, 2);
  sum0 = vmlal_lane_s16(sum0, vget_low_s16(s3), filter, 3);

  int32x4_t sum1 = vmlal_lane_s16(offset, vget_high_s16(s0), filter, 0);
  sum1 = vmlal_lane_s16(sum1, vget_high_s16(s1), filter, 1);
  sum1 = vmlal_lane_s16(sum1, vget_high_s16(s2), filter, 2);
  sum1 = vmlal_lane_s16(sum1, vget_high_s16(s3), filter, 3);

  return vcombine_u16(vqrshrun_n_s32(sum0, COMPOUND_ROUND1_BITS),
                      vqrshrun_n_s32(sum1, COMPOUND_ROUND1_BITS));
}

static INLINE void highbd_dist_wtd_convolve_2d_vert_4tap_neon(
    const uint16_t *src_ptr, int src_stride, uint16_t *dst_ptr, int dst_stride,
    int w, int h, const int16_t *y_filter_ptr, const int offset) {
  const int16x4_t y_filter = vld1_s16(y_filter_ptr + 2);
  const int32x4_t offset_vec = vdupq_n_s32(offset);

  if (w == 4) {
    const int16_t *s = (const int16_t *)src_ptr;
    uint16_t *d = dst_ptr;

    int16x4_t s0, s1, s2;
    load_s16_4x3(s, src_stride, &s0, &s1, &s2);
    s += 3 * src_stride;

    do {
      int16x4_t s3, s4, s5, s6;
      load_s16_4x4(s, src_stride, &s3, &s4, &s5, &s6);

      uint16x4_t d0 =
          highbd_convolve4_4_2d_v(s0, s1, s2, s3, y_filter, offset_vec);
      uint16x4_t d1 =
          highbd_convolve4_4_2d_v(s1, s2, s3, s4, y_filter, offset_vec);
      uint16x4_t d2 =
          highbd_convolve4_4_2d_v(s2, s3, s4, s5, y_filter, offset_vec);
      uint16x4_t d3 =
          highbd_convolve4_4_2d_v(s3, s4, s5, s6, y_filter, offset_vec);

      store_u16_4x4(d, dst_stride, d0, d1, d2, d3);

      s0 = s4;
      s1 = s5;
      s2 = s6;

      s += 4 * src_stride;
      d += 4 * dst_stride;
      h -= 4;
    } while (h != 0);
  } else {
    do {
      int height = h;
      const int16_t *s = (const int16_t *)src_ptr;
      uint16_t *d = dst_ptr;

      int16x8_t s0, s1, s2;
      load_s16_8x3(s, src_stride, &s0, &s1, &s2);
      s += 3 * src_stride;

      do {
        int16x8_t s3, s4, s5, s6;
        load_s16_8x4(s, src_stride, &s3, &s4, &s5, &s6);

        uint16x8_t d0 =
            highbd_convolve4_8_2d_v(s0, s1, s2, s3, y_filter, offset_vec);
        uint16x8_t d1 =
            highbd_convolve4_8_2d_v(s1, s2, s3, s4, y_filter, offset_vec);
        uint16x8_t d2 =
            highbd_convolve4_8_2d_v(s2, s3, s4, s5, y_filter, offset_vec);
        uint16x8_t d3 =
            highbd_convolve4_8_2d_v(s3, s4, s5, s6, y_filter, offset_vec);

        store_u16_8x4(d, dst_stride, d0, d1, d2, d3);

        s0 = s4;
        s1 = s5;
        s2 = s6;

        s += 4 * src_stride;
        d += 4 * dst_stride;
        height -= 4;
      } while (height != 0);
      src_ptr += 8;
      dst_ptr += 8;
      w -= 8;
    } while (w != 0);
  }
}

void av1_highbd_dist_wtd_convolve_2d_sve2(
    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_qn,
    const int subpel_y_qn, ConvolveParams *conv_params, int bd) {
  DECLARE_ALIGNED(16, uint16_t,
                  im_block[(MAX_SB_SIZE + MAX_FILTER_TAP) * MAX_SB_SIZE]);
  DECLARE_ALIGNED(16, uint16_t,
                  im_block2[(MAX_SB_SIZE + MAX_FILTER_TAP) * MAX_SB_SIZE]);

  CONV_BUF_TYPE *dst16 = conv_params->dst;
  int dst16_stride = conv_params->dst_stride;
  const int x_filter_taps = get_filter_tap(filter_params_x, subpel_x_qn);
  const int clamped_x_taps = x_filter_taps < 4 ? 4 : x_filter_taps;

  const int y_filter_taps = get_filter_tap(filter_params_y, subpel_y_qn);
  const int clamped_y_taps = y_filter_taps < 4 ? 4 : y_filter_taps;

  if (x_filter_taps == 6 || y_filter_taps == 6) {
    av1_highbd_dist_wtd_convolve_2d_neon(
        src, src_stride, dst, dst_stride, w, h, filter_params_x,
        filter_params_y, subpel_x_qn, subpel_y_qn, conv_params, bd);
    return;
  }

  const int im_h = h + clamped_y_taps - 1;
  const int im_stride = MAX_SB_SIZE;
  const int vert_offset = clamped_y_taps / 2 - 1;
  const int horiz_offset = clamped_x_taps / 2 - 1;
  const int y_offset_bits = bd + 2 * FILTER_BITS - conv_params->round_0;
  const int round_offset_conv_y = (1 << y_offset_bits);

  const uint16_t *src_ptr = src - vert_offset * src_stride - horiz_offset;

  const int16_t *x_filter_ptr = av1_get_interp_filter_subpel_kernel(
      filter_params_x, subpel_x_qn & SUBPEL_MASK);
  const int16_t *y_filter_ptr = av1_get_interp_filter_subpel_kernel(
      filter_params_y, subpel_y_qn & SUBPEL_MASK);

  if (x_filter_taps <= 4) {
    highbd_dist_wtd_convolve_2d_horiz_4tap_sve2(src_ptr, src_stride, im_block,
                                                im_stride, w, im_h,
                                                x_filter_ptr, conv_params, bd);
  } else {
    if (bd == 12) {
      highbd_12_dist_wtd_convolve_2d_horiz_8tap_sve2(
          src_ptr, src_stride, im_block, im_stride, w, im_h, x_filter_ptr);
    } else {
      highbd_dist_wtd_convolve_2d_horiz_8tap_sve2(
          src_ptr, src_stride, im_block, im_stride, w, im_h, x_filter_ptr, bd);
    }
  }

  if (conv_params->do_average) {
    if (y_filter_taps <= 4) {
      highbd_dist_wtd_convolve_2d_vert_4tap_neon(im_block, im_stride, im_block2,
                                                 im_stride, w, h, y_filter_ptr,
                                                 round_offset_conv_y);
    } else {
      highbd_dist_wtd_convolve_2d_vert_8tap_sve2(im_block, im_stride, im_block2,
                                                 im_stride, w, h, y_filter_ptr,
                                                 round_offset_conv_y);
    }
    if (conv_params->use_dist_wtd_comp_avg) {
      if (bd == 12) {
        highbd_12_dist_wtd_comp_avg_neon(im_block2, im_stride, dst, dst_stride,
                                         w, h, conv_params);

      } else {
        highbd_dist_wtd_comp_avg_neon(im_block2, im_stride, dst, dst_stride, w,
                                      h, conv_params, bd);
      }
    } else {
      if (bd == 12) {
        highbd_12_comp_avg_neon(im_block2, im_stride, dst, dst_stride, w, h,
                                conv_params);

      } else {
        highbd_comp_avg_neon(im_block2, im_stride, dst, dst_stride, w, h,
                             conv_params, bd);
      }
    }
  } else {
    if (y_filter_taps <= 4) {
      highbd_dist_wtd_convolve_2d_vert_4tap_neon(
          im_block, im_stride, dst16, dst16_stride, w, h, y_filter_ptr,
          round_offset_conv_y);
    } else {
      highbd_dist_wtd_convolve_2d_vert_8tap_sve2(
          im_block, im_stride, dst16, dst16_stride, w, h, y_filter_ptr,
          round_offset_conv_y);
    }
  }
}