/*
* Copyright (c) 2023, 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.
*/

#ifndef AOM_AV1_COMMON_ARM_COMPOUND_CONVOLVE_NEON_H_
#define AOM_AV1_COMMON_ARM_COMPOUND_CONVOLVE_NEON_H_

#include "mem_neon.h"
#include "convolve.h"
#include "filter.h"

#define __builtin_prefetch(x)
#define LIKELY(v) __builtin_expect(v, 1)
#define UNLIKELY(v) __builtin_expect(v, 0)

static INLINE void compute_dist_wtd_avg_4x4(uint16x4_t dd0, uint16x4_t dd1, uint16x4_t dd2, uint16x4_t dd3,
                                            uint16x4_t d0, uint16x4_t d1, uint16x4_t d2, uint16x4_t d3,
                                            const uint16_t fwd_offset, const uint16_t bck_offset,
                                            const int16x8_t round_offset, uint8x8_t *d01_u8, uint8x8_t *d23_u8) {
    uint32x4_t blend0 = vmull_n_u16(dd0, fwd_offset);
    blend0            = vmlal_n_u16(blend0, d0, bck_offset);
    uint32x4_t blend1 = vmull_n_u16(dd1, fwd_offset);
    blend1            = vmlal_n_u16(blend1, d1, bck_offset);
    uint32x4_t blend2 = vmull_n_u16(dd2, fwd_offset);
    blend2            = vmlal_n_u16(blend2, d2, bck_offset);
    uint32x4_t blend3 = vmull_n_u16(dd3, fwd_offset);
    blend3            = vmlal_n_u16(blend3, d3, bck_offset);

    uint16x4_t avg0 = vshrn_n_u32(blend0, DIST_PRECISION_BITS);
    uint16x4_t avg1 = vshrn_n_u32(blend1, DIST_PRECISION_BITS);
    uint16x4_t avg2 = vshrn_n_u32(blend2, DIST_PRECISION_BITS);
    uint16x4_t avg3 = vshrn_n_u32(blend3, DIST_PRECISION_BITS);

    int16x8_t dst_01 = vreinterpretq_s16_u16(vcombine_u16(avg0, avg1));
    int16x8_t dst_23 = vreinterpretq_s16_u16(vcombine_u16(avg2, avg3));

    dst_01 = vsubq_s16(dst_01, round_offset);
    dst_23 = vsubq_s16(dst_23, round_offset);

    *d01_u8 = vqrshrun_n_s16(dst_01, FILTER_BITS - ROUND0_BITS);
    *d23_u8 = vqrshrun_n_s16(dst_23, FILTER_BITS - ROUND0_BITS);
}

static INLINE void compute_dist_wtd_avg_4x1(uint16x4_t dd0, uint16x4_t d0, const uint16_t fwd_offset,
                                            const uint16_t bck_offset, const int16x4_t round_offset, uint8x8_t *d0_u8) {
    uint32x4_t blend0 = vmull_n_u16(dd0, fwd_offset);
    blend0            = vmlal_n_u16(blend0, d0, bck_offset);

    uint16x4_t avg0 = vshrn_n_u32(blend0, DIST_PRECISION_BITS);

    int16x4_t dst0 = vsub_s16(vreinterpret_s16_u16(avg0), round_offset);

    int16x8_t dst0q = vcombine_s16(dst0, vdup_n_s16(0));

    *d0_u8 = vqrshrun_n_s16(dst0q, FILTER_BITS - ROUND0_BITS);
}

static INLINE void compute_basic_avg_4x1(uint16x4_t dd0, uint16x4_t d0, const int16x4_t round_offset,
                                         uint8x8_t *d0_u8) {
    uint16x4_t avg0 = vhadd_u16(dd0, d0);

    int16x4_t dst0 = vsub_s16(vreinterpret_s16_u16(avg0), round_offset);

    int16x8_t dst0q = vcombine_s16(dst0, vdup_n_s16(0));

    *d0_u8 = vqrshrun_n_s16(dst0q, FILTER_BITS - ROUND0_BITS);
}

static INLINE void compute_dist_wtd_avg_8x1(uint16x8_t dd0, uint16x8_t d0, const uint16_t fwd_offset,
                                            const uint16_t bck_offset, const int16x8_t round_offset, uint8x8_t *d0_u8) {
    uint32x4_t blend0_lo = vmull_n_u16(vget_low_u16(dd0), fwd_offset);
    blend0_lo            = vmlal_n_u16(blend0_lo, vget_low_u16(d0), bck_offset);
    uint32x4_t blend0_hi = vmull_n_u16(vget_high_u16(dd0), fwd_offset);
    blend0_hi            = vmlal_n_u16(blend0_hi, vget_high_u16(d0), bck_offset);

    uint16x8_t avg0 = vcombine_u16(vshrn_n_u32(blend0_lo, DIST_PRECISION_BITS),
                                   vshrn_n_u32(blend0_hi, DIST_PRECISION_BITS));

    int16x8_t dst0 = vsubq_s16(vreinterpretq_s16_u16(avg0), round_offset);

    *d0_u8 = vqrshrun_n_s16(dst0, FILTER_BITS - ROUND0_BITS);
}

static INLINE void compute_basic_avg_8x1(uint16x8_t dd0, uint16x8_t d0, const int16x8_t round_offset,
                                         uint8x8_t *d0_u8) {
    uint16x8_t avg0 = vhaddq_u16(dd0, d0);

    int16x8_t dst0 = vsubq_s16(vreinterpretq_s16_u16(avg0), round_offset);

    *d0_u8 = vqrshrun_n_s16(dst0, FILTER_BITS - ROUND0_BITS);
}

static INLINE void compute_basic_avg_4x4(uint16x4_t dd0, uint16x4_t dd1, uint16x4_t dd2, uint16x4_t dd3, uint16x4_t d0,
                                         uint16x4_t d1, uint16x4_t d2, uint16x4_t d3, const int16x8_t round_offset,
                                         uint8x8_t *d01_u8, uint8x8_t *d23_u8) {
    uint16x4_t avg0 = vhadd_u16(dd0, d0);
    uint16x4_t avg1 = vhadd_u16(dd1, d1);
    uint16x4_t avg2 = vhadd_u16(dd2, d2);
    uint16x4_t avg3 = vhadd_u16(dd3, d3);

    int16x8_t dst_01 = vreinterpretq_s16_u16(vcombine_u16(avg0, avg1));
    int16x8_t dst_23 = vreinterpretq_s16_u16(vcombine_u16(avg2, avg3));

    dst_01 = vsubq_s16(dst_01, round_offset);
    dst_23 = vsubq_s16(dst_23, round_offset);

    *d01_u8 = vqrshrun_n_s16(dst_01, FILTER_BITS - ROUND0_BITS);
    *d23_u8 = vqrshrun_n_s16(dst_23, FILTER_BITS - ROUND0_BITS);
}

static INLINE void compute_dist_wtd_avg_8x4(uint16x8_t dd0, uint16x8_t dd1, uint16x8_t dd2, uint16x8_t dd3,
                                            uint16x8_t d0, uint16x8_t d1, uint16x8_t d2, uint16x8_t d3,
                                            const uint16_t fwd_offset, const uint16_t bck_offset,
                                            const int16x8_t round_offset, uint8x8_t *d0_u8, uint8x8_t *d1_u8,
                                            uint8x8_t *d2_u8, uint8x8_t *d3_u8) {
    uint32x4_t blend0_lo = vmull_n_u16(vget_low_u16(dd0), fwd_offset);
    blend0_lo            = vmlal_n_u16(blend0_lo, vget_low_u16(d0), bck_offset);
    uint32x4_t blend0_hi = vmull_n_u16(vget_high_u16(dd0), fwd_offset);
    blend0_hi            = vmlal_n_u16(blend0_hi, vget_high_u16(d0), bck_offset);

    uint32x4_t blend1_lo = vmull_n_u16(vget_low_u16(dd1), fwd_offset);
    blend1_lo            = vmlal_n_u16(blend1_lo, vget_low_u16(d1), bck_offset);
    uint32x4_t blend1_hi = vmull_n_u16(vget_high_u16(dd1), fwd_offset);
    blend1_hi            = vmlal_n_u16(blend1_hi, vget_high_u16(d1), bck_offset);

    uint32x4_t blend2_lo = vmull_n_u16(vget_low_u16(dd2), fwd_offset);
    blend2_lo            = vmlal_n_u16(blend2_lo, vget_low_u16(d2), bck_offset);
    uint32x4_t blend2_hi = vmull_n_u16(vget_high_u16(dd2), fwd_offset);
    blend2_hi            = vmlal_n_u16(blend2_hi, vget_high_u16(d2), bck_offset);

    uint32x4_t blend3_lo = vmull_n_u16(vget_low_u16(dd3), fwd_offset);
    blend3_lo            = vmlal_n_u16(blend3_lo, vget_low_u16(d3), bck_offset);
    uint32x4_t blend3_hi = vmull_n_u16(vget_high_u16(dd3), fwd_offset);
    blend3_hi            = vmlal_n_u16(blend3_hi, vget_high_u16(d3), bck_offset);

    uint16x8_t avg0 = vcombine_u16(vshrn_n_u32(blend0_lo, DIST_PRECISION_BITS),
                                   vshrn_n_u32(blend0_hi, DIST_PRECISION_BITS));
    uint16x8_t avg1 = vcombine_u16(vshrn_n_u32(blend1_lo, DIST_PRECISION_BITS),
                                   vshrn_n_u32(blend1_hi, DIST_PRECISION_BITS));
    uint16x8_t avg2 = vcombine_u16(vshrn_n_u32(blend2_lo, DIST_PRECISION_BITS),
                                   vshrn_n_u32(blend2_hi, DIST_PRECISION_BITS));
    uint16x8_t avg3 = vcombine_u16(vshrn_n_u32(blend3_lo, DIST_PRECISION_BITS),
                                   vshrn_n_u32(blend3_hi, DIST_PRECISION_BITS));

    int16x8_t dst0 = vsubq_s16(vreinterpretq_s16_u16(avg0), round_offset);
    int16x8_t dst1 = vsubq_s16(vreinterpretq_s16_u16(avg1), round_offset);
    int16x8_t dst2 = vsubq_s16(vreinterpretq_s16_u16(avg2), round_offset);
    int16x8_t dst3 = vsubq_s16(vreinterpretq_s16_u16(avg3), round_offset);

    *d0_u8 = vqrshrun_n_s16(dst0, FILTER_BITS - ROUND0_BITS);
    *d1_u8 = vqrshrun_n_s16(dst1, FILTER_BITS - ROUND0_BITS);
    *d2_u8 = vqrshrun_n_s16(dst2, FILTER_BITS - ROUND0_BITS);
    *d3_u8 = vqrshrun_n_s16(dst3, FILTER_BITS - ROUND0_BITS);
}

static INLINE void compute_basic_avg_8x4(uint16x8_t dd0, uint16x8_t dd1, uint16x8_t dd2, uint16x8_t dd3, uint16x8_t d0,
                                         uint16x8_t d1, uint16x8_t d2, uint16x8_t d3, const int16x8_t round_offset,
                                         uint8x8_t *d0_u8, uint8x8_t *d1_u8, uint8x8_t *d2_u8, uint8x8_t *d3_u8) {
    uint16x8_t avg0 = vhaddq_u16(dd0, d0);
    uint16x8_t avg1 = vhaddq_u16(dd1, d1);
    uint16x8_t avg2 = vhaddq_u16(dd2, d2);
    uint16x8_t avg3 = vhaddq_u16(dd3, d3);

    int16x8_t dst0 = vsubq_s16(vreinterpretq_s16_u16(avg0), round_offset);
    int16x8_t dst1 = vsubq_s16(vreinterpretq_s16_u16(avg1), round_offset);
    int16x8_t dst2 = vsubq_s16(vreinterpretq_s16_u16(avg2), round_offset);
    int16x8_t dst3 = vsubq_s16(vreinterpretq_s16_u16(avg3), round_offset);

    *d0_u8 = vqrshrun_n_s16(dst0, FILTER_BITS - ROUND0_BITS);
    *d1_u8 = vqrshrun_n_s16(dst1, FILTER_BITS - ROUND0_BITS);
    *d2_u8 = vqrshrun_n_s16(dst2, FILTER_BITS - ROUND0_BITS);
    *d3_u8 = vqrshrun_n_s16(dst3, FILTER_BITS - ROUND0_BITS);
}

static INLINE uint16x4_t convolve6_4_2d_v(const int16x4_t s0, const int16x4_t s1, const int16x4_t s2,
                                          const int16x4_t s3, const int16x4_t s4, const int16x4_t s5,
                                          const int16x8_t y_filter, const int32x4_t offset_const) {
    const int16x4_t y_filter_0_3 = vget_low_s16(y_filter);
    const int16x4_t y_filter_4_7 = vget_high_s16(y_filter);

    int32x4_t sum = offset_const;
    // Filter values at indices 0 and 7 are 0.
    sum = vmlal_lane_s16(sum, s0, y_filter_0_3, 1);
    sum = vmlal_lane_s16(sum, s1, y_filter_0_3, 2);
    sum = vmlal_lane_s16(sum, s2, y_filter_0_3, 3);
    sum = vmlal_lane_s16(sum, s3, y_filter_4_7, 0);
    sum = vmlal_lane_s16(sum, s4, y_filter_4_7, 1);
    sum = vmlal_lane_s16(sum, s5, y_filter_4_7, 2);

    return vqrshrun_n_s32(sum, COMPOUND_ROUND1_BITS);
}

static INLINE uint16x8_t convolve6_8_2d_v(const int16x8_t s0, const int16x8_t s1, const int16x8_t s2,
                                          const int16x8_t s3, const int16x8_t s4, const int16x8_t s5,
                                          const int16x8_t y_filter, const int32x4_t offset_const) {
    const int16x4_t y_filter_0_3 = vget_low_s16(y_filter);
    const int16x4_t y_filter_4_7 = vget_high_s16(y_filter);

    int32x4_t sum0 = offset_const;
    // Filter values at indices 0 and 7 are 0.
    sum0 = vmlal_lane_s16(sum0, vget_low_s16(s0), y_filter_0_3, 1);
    sum0 = vmlal_lane_s16(sum0, vget_low_s16(s1), y_filter_0_3, 2);
    sum0 = vmlal_lane_s16(sum0, vget_low_s16(s2), y_filter_0_3, 3);
    sum0 = vmlal_lane_s16(sum0, vget_low_s16(s3), y_filter_4_7, 0);
    sum0 = vmlal_lane_s16(sum0, vget_low_s16(s4), y_filter_4_7, 1);
    sum0 = vmlal_lane_s16(sum0, vget_low_s16(s5), y_filter_4_7, 2);

    int32x4_t sum1 = offset_const;
    sum1           = vmlal_lane_s16(sum1, vget_high_s16(s0), y_filter_0_3, 1);
    sum1           = vmlal_lane_s16(sum1, vget_high_s16(s1), y_filter_0_3, 2);
    sum1           = vmlal_lane_s16(sum1, vget_high_s16(s2), y_filter_0_3, 3);
    sum1           = vmlal_lane_s16(sum1, vget_high_s16(s3), y_filter_4_7, 0);
    sum1           = vmlal_lane_s16(sum1, vget_high_s16(s4), y_filter_4_7, 1);
    sum1           = vmlal_lane_s16(sum1, vget_high_s16(s5), y_filter_4_7, 2);

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

static INLINE void dist_wtd_convolve_2d_vert_6tap_dist_wtd_avg_neon(int16_t *src_ptr, const int src_stride,
                                                                    uint8_t *dst8_ptr, int dst8_stride,
                                                                    ConvolveParams *conv_params,
                                                                    const int16x8_t y_filter, int h, int w) {
    const int       bd           = 8;
    const int       offset_bits  = bd + 2 * FILTER_BITS - ROUND0_BITS;
    const int32x4_t offset_const = vdupq_n_s32(1 << offset_bits);
    const int16_t   round_offset = (1 << (offset_bits - COMPOUND_ROUND1_BITS)) +
        (1 << (offset_bits - COMPOUND_ROUND1_BITS - 1));
    const int16x8_t round_offset_vec = vdupq_n_s16(round_offset);

    const uint16_t fwd_offset = conv_params->fwd_offset;
    const uint16_t bck_offset = conv_params->bck_offset;

    CONV_BUF_TYPE *dst_ptr    = conv_params->dst;
    const int      dst_stride = conv_params->dst_stride;

    if (w == 4) {
        int16x4_t s0, s1, s2, s3, s4;
        load_s16_4x5(src_ptr, src_stride, &s0, &s1, &s2, &s3, &s4);
        src_ptr += 5 * src_stride;

        do {
            int16x4_t s5, s6, s7, s8;
            load_s16_4x4(src_ptr, src_stride, &s5, &s6, &s7, &s8);

            uint16x4_t d0 = convolve6_4_2d_v(s0, s1, s2, s3, s4, s5, y_filter, offset_const);
            uint16x4_t d1 = convolve6_4_2d_v(s1, s2, s3, s4, s5, s6, y_filter, offset_const);
            uint16x4_t d2 = convolve6_4_2d_v(s2, s3, s4, s5, s6, s7, y_filter, offset_const);
            uint16x4_t d3 = convolve6_4_2d_v(s3, s4, s5, s6, s7, s8, y_filter, offset_const);

            uint16x4_t dd0, dd1, dd2, dd3;
            load_u16_4x4(dst_ptr, dst_stride, &dd0, &dd1, &dd2, &dd3);

            uint8x8_t d01_u8, d23_u8;
            compute_dist_wtd_avg_4x4(
                dd0, dd1, dd2, dd3, d0, d1, d2, d3, fwd_offset, bck_offset, round_offset_vec, &d01_u8, &d23_u8);

            store_u8_4x1(dst8_ptr + 0 * dst8_stride, d01_u8, 0);
            store_u8_4x1(dst8_ptr + 1 * dst8_stride, d01_u8, 1);
            store_u8_4x1(dst8_ptr + 2 * dst8_stride, d23_u8, 0);
            store_u8_4x1(dst8_ptr + 3 * dst8_stride, d23_u8, 1);
            dst8_ptr += 4 * dst8_stride;

            s0 = s4;
            s1 = s5;
            s2 = s6;
            s3 = s7;
            s4 = s8;
            src_ptr += 4 * src_stride;
            dst_ptr += 4 * dst_stride;
            h -= 4;
        } while (h != 0);
    } else {
        do {
            int16_t       *s      = src_ptr;
            CONV_BUF_TYPE *d      = dst_ptr;
            uint8_t       *d_u8   = dst8_ptr;
            int            height = h;

            int16x8_t s0, s1, s2, s3, s4;
            load_s16_8x5(s, src_stride, &s0, &s1, &s2, &s3, &s4);
            s += 5 * src_stride;

            do {
                int16x8_t s5, s6, s7, s8;
                load_s16_8x4(s, src_stride, &s5, &s6, &s7, &s8);

                uint16x8_t d0 = convolve6_8_2d_v(s0, s1, s2, s3, s4, s5, y_filter, offset_const);
                uint16x8_t d1 = convolve6_8_2d_v(s1, s2, s3, s4, s5, s6, y_filter, offset_const);
                uint16x8_t d2 = convolve6_8_2d_v(s2, s3, s4, s5, s6, s7, y_filter, offset_const);
                uint16x8_t d3 = convolve6_8_2d_v(s3, s4, s5, s6, s7, s8, y_filter, offset_const);

                uint16x8_t dd0, dd1, dd2, dd3;
                load_u16_8x4(d, dst_stride, &dd0, &dd1, &dd2, &dd3);

                uint8x8_t d0_u8, d1_u8, d2_u8, d3_u8;
                compute_dist_wtd_avg_8x4(dd0,
                                         dd1,
                                         dd2,
                                         dd3,
                                         d0,
                                         d1,
                                         d2,
                                         d3,
                                         fwd_offset,
                                         bck_offset,
                                         round_offset_vec,
                                         &d0_u8,
                                         &d1_u8,
                                         &d2_u8,
                                         &d3_u8);

                store_u8_8x4(d_u8, dst8_stride, d0_u8, d1_u8, d2_u8, d3_u8);
                d_u8 += 4 * dst8_stride;

                s0 = s4;
                s1 = s5;
                s2 = s6;
                s3 = s7;
                s4 = s8;
                s += 4 * src_stride;
                d += 4 * dst_stride;
                height -= 4;
            } while (height != 0);
            src_ptr += 8;
            dst_ptr += 8;
            dst8_ptr += 8;
            w -= 8;
        } while (w != 0);
    }
}

static INLINE void dist_wtd_convolve_2d_vert_6tap_avg_neon(int16_t *src_ptr, const int src_stride, uint8_t *dst8_ptr,
                                                           int dst8_stride, ConvolveParams *conv_params,
                                                           const int16x8_t y_filter, int h, int w) {
    const int       bd           = 8;
    const int       offset_bits  = bd + 2 * FILTER_BITS - ROUND0_BITS;
    const int32x4_t offset_const = vdupq_n_s32(1 << offset_bits);
    const int16_t   round_offset = (1 << (offset_bits - COMPOUND_ROUND1_BITS)) +
        (1 << (offset_bits - COMPOUND_ROUND1_BITS - 1));
    const int16x8_t round_offset_vec = vdupq_n_s16(round_offset);

    CONV_BUF_TYPE *dst_ptr    = conv_params->dst;
    const int      dst_stride = conv_params->dst_stride;

    if (w == 4) {
        int16x4_t s0, s1, s2, s3, s4;
        load_s16_4x5(src_ptr, src_stride, &s0, &s1, &s2, &s3, &s4);
        src_ptr += 5 * src_stride;

        do {
            int16x4_t s5, s6, s7, s8;
            load_s16_4x4(src_ptr, src_stride, &s5, &s6, &s7, &s8);

            uint16x4_t d0 = convolve6_4_2d_v(s0, s1, s2, s3, s4, s5, y_filter, offset_const);
            uint16x4_t d1 = convolve6_4_2d_v(s1, s2, s3, s4, s5, s6, y_filter, offset_const);
            uint16x4_t d2 = convolve6_4_2d_v(s2, s3, s4, s5, s6, s7, y_filter, offset_const);
            uint16x4_t d3 = convolve6_4_2d_v(s3, s4, s5, s6, s7, s8, y_filter, offset_const);

            uint16x4_t dd0, dd1, dd2, dd3;
            load_u16_4x4(dst_ptr, dst_stride, &dd0, &dd1, &dd2, &dd3);

            uint8x8_t d01_u8, d23_u8;
            compute_basic_avg_4x4(dd0, dd1, dd2, dd3, d0, d1, d2, d3, round_offset_vec, &d01_u8, &d23_u8);

            store_u8_4x1(dst8_ptr + 0 * dst8_stride, d01_u8, 0);
            store_u8_4x1(dst8_ptr + 1 * dst8_stride, d01_u8, 1);
            store_u8_4x1(dst8_ptr + 2 * dst8_stride, d23_u8, 0);
            store_u8_4x1(dst8_ptr + 3 * dst8_stride, d23_u8, 1);
            dst8_ptr += 4 * dst8_stride;

            s0 = s4;
            s1 = s5;
            s2 = s6;
            s3 = s7;
            s4 = s8;
            src_ptr += 4 * src_stride;
            dst_ptr += 4 * dst_stride;
            h -= 4;
        } while (h != 0);
    } else {
        do {
            int16_t       *s      = src_ptr;
            CONV_BUF_TYPE *d      = dst_ptr;
            uint8_t       *d_u8   = dst8_ptr;
            int            height = h;

            int16x8_t s0, s1, s2, s3, s4;
            load_s16_8x5(s, src_stride, &s0, &s1, &s2, &s3, &s4);
            s += 5 * src_stride;

            do {
                int16x8_t s5, s6, s7, s8;
                load_s16_8x4(s, src_stride, &s5, &s6, &s7, &s8);

                uint16x8_t d0 = convolve6_8_2d_v(s0, s1, s2, s3, s4, s5, y_filter, offset_const);
                uint16x8_t d1 = convolve6_8_2d_v(s1, s2, s3, s4, s5, s6, y_filter, offset_const);
                uint16x8_t d2 = convolve6_8_2d_v(s2, s3, s4, s5, s6, s7, y_filter, offset_const);
                uint16x8_t d3 = convolve6_8_2d_v(s3, s4, s5, s6, s7, s8, y_filter, offset_const);

                uint16x8_t dd0, dd1, dd2, dd3;
                load_u16_8x4(d, dst_stride, &dd0, &dd1, &dd2, &dd3);

                uint8x8_t d0_u8, d1_u8, d2_u8, d3_u8;
                compute_basic_avg_8x4(
                    dd0, dd1, dd2, dd3, d0, d1, d2, d3, round_offset_vec, &d0_u8, &d1_u8, &d2_u8, &d3_u8);

                store_u8_8x4(d_u8, dst8_stride, d0_u8, d1_u8, d2_u8, d3_u8);
                d_u8 += 4 * dst8_stride;

                s0 = s4;
                s1 = s5;
                s2 = s6;
                s3 = s7;
                s4 = s8;
                s += 4 * src_stride;
                d += 4 * dst_stride;
                height -= 4;
            } while (height != 0);
            src_ptr += 8;
            dst_ptr += 8;
            dst8_ptr += 8;
            w -= 8;
        } while (w != 0);
    }
}

static INLINE void dist_wtd_convolve_2d_vert_6tap_neon(int16_t *src_ptr, const int src_stride,
                                                       ConvolveParams *conv_params, const int16x8_t y_filter, int h,
                                                       int w) {
    const int       bd           = 8;
    const int       offset_bits  = bd + 2 * FILTER_BITS - ROUND0_BITS;
    const int32x4_t offset_const = vdupq_n_s32(1 << offset_bits);

    CONV_BUF_TYPE *dst_ptr    = conv_params->dst;
    const int      dst_stride = conv_params->dst_stride;

    if (w == 4) {
        int16x4_t s0, s1, s2, s3, s4;
        load_s16_4x5(src_ptr, src_stride, &s0, &s1, &s2, &s3, &s4);
        src_ptr += 5 * src_stride;

        do {
            int16x4_t s5, s6, s7, s8;
            load_s16_4x4(src_ptr, src_stride, &s5, &s6, &s7, &s8);

            uint16x4_t d0 = convolve6_4_2d_v(s0, s1, s2, s3, s4, s5, y_filter, offset_const);
            uint16x4_t d1 = convolve6_4_2d_v(s1, s2, s3, s4, s5, s6, y_filter, offset_const);
            uint16x4_t d2 = convolve6_4_2d_v(s2, s3, s4, s5, s6, s7, y_filter, offset_const);
            uint16x4_t d3 = convolve6_4_2d_v(s3, s4, s5, s6, s7, s8, y_filter, offset_const);

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

            s0 = s4;
            s1 = s5;
            s2 = s6;
            s3 = s7;
            s4 = s8;
            src_ptr += 4 * src_stride;
            dst_ptr += 4 * dst_stride;
            h -= 4;
        } while (h != 0);
    } else {
        do {
            int16_t       *s      = src_ptr;
            CONV_BUF_TYPE *d      = dst_ptr;
            int            height = h;

            int16x8_t s0, s1, s2, s3, s4;
            load_s16_8x5(s, src_stride, &s0, &s1, &s2, &s3, &s4);
            s += 5 * src_stride;

            do {
                int16x8_t s5, s6, s7, s8;
                load_s16_8x4(s, src_stride, &s5, &s6, &s7, &s8);

                uint16x8_t d0 = convolve6_8_2d_v(s0, s1, s2, s3, s4, s5, y_filter, offset_const);
                uint16x8_t d1 = convolve6_8_2d_v(s1, s2, s3, s4, s5, s6, y_filter, offset_const);
                uint16x8_t d2 = convolve6_8_2d_v(s2, s3, s4, s5, s6, s7, y_filter, offset_const);
                uint16x8_t d3 = convolve6_8_2d_v(s3, s4, s5, s6, s7, s8, y_filter, offset_const);

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

                s0 = s4;
                s1 = s5;
                s2 = s6;
                s3 = s7;
                s4 = s8;
                s += 4 * src_stride;
                d += 4 * dst_stride;
                height -= 4;
            } while (height != 0);
            src_ptr += 8;
            dst_ptr += 8;
            w -= 8;
        } while (w != 0);
    }
}

static INLINE uint16x4_t convolve8_4_2d_v(const int16x4_t s0, const int16x4_t s1, const int16x4_t s2,
                                          const int16x4_t s3, const int16x4_t s4, const int16x4_t s5,
                                          const int16x4_t s6, const int16x4_t s7, const int16x8_t y_filter,
                                          const int32x4_t offset_const) {
    const int16x4_t y_filter_0_3 = vget_low_s16(y_filter);
    const int16x4_t y_filter_4_7 = vget_high_s16(y_filter);

    int32x4_t sum = offset_const;
    sum           = vmlal_lane_s16(sum, s0, y_filter_0_3, 0);
    sum           = vmlal_lane_s16(sum, s1, y_filter_0_3, 1);
    sum           = vmlal_lane_s16(sum, s2, y_filter_0_3, 2);
    sum           = vmlal_lane_s16(sum, s3, y_filter_0_3, 3);
    sum           = vmlal_lane_s16(sum, s4, y_filter_4_7, 0);
    sum           = vmlal_lane_s16(sum, s5, y_filter_4_7, 1);
    sum           = vmlal_lane_s16(sum, s6, y_filter_4_7, 2);
    sum           = vmlal_lane_s16(sum, s7, y_filter_4_7, 3);

    return vqrshrun_n_s32(sum, COMPOUND_ROUND1_BITS);
}

static INLINE uint16x8_t convolve8_8_2d_v(const int16x8_t s0, const int16x8_t s1, const int16x8_t s2,
                                          const int16x8_t s3, const int16x8_t s4, const int16x8_t s5,
                                          const int16x8_t s6, const int16x8_t s7, const int16x8_t y_filter,
                                          const int32x4_t offset_const) {
    const int16x4_t y_filter_0_3 = vget_low_s16(y_filter);
    const int16x4_t y_filter_4_7 = vget_high_s16(y_filter);

    int32x4_t sum0 = offset_const;
    sum0           = vmlal_lane_s16(sum0, vget_low_s16(s0), y_filter_0_3, 0);
    sum0           = vmlal_lane_s16(sum0, vget_low_s16(s1), y_filter_0_3, 1);
    sum0           = vmlal_lane_s16(sum0, vget_low_s16(s2), y_filter_0_3, 2);
    sum0           = vmlal_lane_s16(sum0, vget_low_s16(s3), y_filter_0_3, 3);
    sum0           = vmlal_lane_s16(sum0, vget_low_s16(s4), y_filter_4_7, 0);
    sum0           = vmlal_lane_s16(sum0, vget_low_s16(s5), y_filter_4_7, 1);
    sum0           = vmlal_lane_s16(sum0, vget_low_s16(s6), y_filter_4_7, 2);
    sum0           = vmlal_lane_s16(sum0, vget_low_s16(s7), y_filter_4_7, 3);

    int32x4_t sum1 = offset_const;
    sum1           = vmlal_lane_s16(sum1, vget_high_s16(s0), y_filter_0_3, 0);
    sum1           = vmlal_lane_s16(sum1, vget_high_s16(s1), y_filter_0_3, 1);
    sum1           = vmlal_lane_s16(sum1, vget_high_s16(s2), y_filter_0_3, 2);
    sum1           = vmlal_lane_s16(sum1, vget_high_s16(s3), y_filter_0_3, 3);
    sum1           = vmlal_lane_s16(sum1, vget_high_s16(s4), y_filter_4_7, 0);
    sum1           = vmlal_lane_s16(sum1, vget_high_s16(s5), y_filter_4_7, 1);
    sum1           = vmlal_lane_s16(sum1, vget_high_s16(s6), y_filter_4_7, 2);
    sum1           = vmlal_lane_s16(sum1, vget_high_s16(s7), y_filter_4_7, 3);

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

static INLINE void dist_wtd_convolve_2d_vert_8tap_dist_wtd_avg_neon(int16_t *src_ptr, const int src_stride,
                                                                    uint8_t *dst8_ptr, int dst8_stride,
                                                                    ConvolveParams *conv_params,
                                                                    const int16x8_t y_filter, int h, int w) {
    const int       bd           = 8;
    const int       offset_bits  = bd + 2 * FILTER_BITS - ROUND0_BITS;
    const int32x4_t offset_const = vdupq_n_s32(1 << offset_bits);
    const int16_t   round_offset = (1 << (offset_bits - COMPOUND_ROUND1_BITS)) +
        (1 << (offset_bits - COMPOUND_ROUND1_BITS - 1));
    const int16x8_t round_offset_vec = vdupq_n_s16(round_offset);

    const uint16_t fwd_offset = conv_params->fwd_offset;
    const uint16_t bck_offset = conv_params->bck_offset;

    CONV_BUF_TYPE *dst_ptr    = conv_params->dst;
    const int      dst_stride = conv_params->dst_stride;

    if (w == 4) {
        int16x4_t s0, s1, s2, s3, s4, s5, s6;
        load_s16_4x7(src_ptr, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6);
        src_ptr += 7 * src_stride;

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

            uint16x4_t d0 = convolve8_4_2d_v(s0, s1, s2, s3, s4, s5, s6, s7, y_filter, offset_const);
            uint16x4_t d1 = convolve8_4_2d_v(s1, s2, s3, s4, s5, s6, s7, s8, y_filter, offset_const);
            uint16x4_t d2 = convolve8_4_2d_v(s2, s3, s4, s5, s6, s7, s8, s9, y_filter, offset_const);
            uint16x4_t d3 = convolve8_4_2d_v(s3, s4, s5, s6, s7, s8, s9, s10, y_filter, offset_const);

            uint16x4_t dd0, dd1, dd2, dd3;
            load_u16_4x4(dst_ptr, dst_stride, &dd0, &dd1, &dd2, &dd3);

            uint8x8_t d01_u8, d23_u8;
            compute_dist_wtd_avg_4x4(
                dd0, dd1, dd2, dd3, d0, d1, d2, d3, fwd_offset, bck_offset, round_offset_vec, &d01_u8, &d23_u8);

            store_u8_4x1(dst8_ptr + 0 * dst8_stride, d01_u8, 0);
            store_u8_4x1(dst8_ptr + 1 * dst8_stride, d01_u8, 1);
            store_u8_4x1(dst8_ptr + 2 * dst8_stride, d23_u8, 0);
            store_u8_4x1(dst8_ptr + 3 * dst8_stride, d23_u8, 1);
            dst8_ptr += 4 * dst8_stride;

            s0 = s4;
            s1 = s5;
            s2 = s6;
            s3 = s7;
            s4 = s8;
            s5 = s9;
            s6 = s10;
            src_ptr += 4 * src_stride;
            dst_ptr += 4 * dst_stride;
            h -= 4;
        } while (h != 0);
    } else {
        do {
            int16_t       *s      = src_ptr;
            CONV_BUF_TYPE *d      = dst_ptr;
            uint8_t       *d_u8   = dst8_ptr;
            int            height = h;

            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;

            do {
                int16x8_t s7, s8, s9, s10;
                load_s16_8x4(s, src_stride, &s7, &s8, &s9, &s10);

                uint16x8_t d0 = convolve8_8_2d_v(s0, s1, s2, s3, s4, s5, s6, s7, y_filter, offset_const);
                uint16x8_t d1 = convolve8_8_2d_v(s1, s2, s3, s4, s5, s6, s7, s8, y_filter, offset_const);
                uint16x8_t d2 = convolve8_8_2d_v(s2, s3, s4, s5, s6, s7, s8, s9, y_filter, offset_const);
                uint16x8_t d3 = convolve8_8_2d_v(s3, s4, s5, s6, s7, s8, s9, s10, y_filter, offset_const);

                uint16x8_t dd0, dd1, dd2, dd3;
                load_u16_8x4(d, dst_stride, &dd0, &dd1, &dd2, &dd3);

                uint8x8_t d0_u8, d1_u8, d2_u8, d3_u8;
                compute_dist_wtd_avg_8x4(dd0,
                                         dd1,
                                         dd2,
                                         dd3,
                                         d0,
                                         d1,
                                         d2,
                                         d3,
                                         fwd_offset,
                                         bck_offset,
                                         round_offset_vec,
                                         &d0_u8,
                                         &d1_u8,
                                         &d2_u8,
                                         &d3_u8);

                store_u8_8x4(d_u8, dst8_stride, d0_u8, d1_u8, d2_u8, d3_u8);
                d_u8 += 4 * dst8_stride;

                s0 = s4;
                s1 = s5;
                s2 = s6;
                s3 = s7;
                s4 = s8;
                s5 = s9;
                s6 = s10;
                s += 4 * src_stride;
                d += 4 * dst_stride;
                height -= 4;
            } while (height != 0);
            src_ptr += 8;
            dst_ptr += 8;
            dst8_ptr += 8;
            w -= 8;
        } while (w != 0);
    }
}

static INLINE void dist_wtd_convolve_2d_vert_8tap_avg_neon(int16_t *src_ptr, const int src_stride, uint8_t *dst8_ptr,
                                                           int dst8_stride, ConvolveParams *conv_params,
                                                           const int16x8_t y_filter, int h, int w) {
    const int       bd           = 8;
    const int       offset_bits  = bd + 2 * FILTER_BITS - ROUND0_BITS;
    const int32x4_t offset_const = vdupq_n_s32(1 << offset_bits);
    const int16_t   round_offset = (1 << (offset_bits - COMPOUND_ROUND1_BITS)) +
        (1 << (offset_bits - COMPOUND_ROUND1_BITS - 1));
    const int16x8_t round_offset_vec = vdupq_n_s16(round_offset);

    CONV_BUF_TYPE *dst_ptr    = conv_params->dst;
    const int      dst_stride = conv_params->dst_stride;

    if (w == 4) {
        int16x4_t s0, s1, s2, s3, s4, s5, s6;
        load_s16_4x7(src_ptr, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6);
        src_ptr += 7 * src_stride;

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

            uint16x4_t d0 = convolve8_4_2d_v(s0, s1, s2, s3, s4, s5, s6, s7, y_filter, offset_const);
            uint16x4_t d1 = convolve8_4_2d_v(s1, s2, s3, s4, s5, s6, s7, s8, y_filter, offset_const);
            uint16x4_t d2 = convolve8_4_2d_v(s2, s3, s4, s5, s6, s7, s8, s9, y_filter, offset_const);
            uint16x4_t d3 = convolve8_4_2d_v(s3, s4, s5, s6, s7, s8, s9, s10, y_filter, offset_const);

            uint16x4_t dd0, dd1, dd2, dd3;
            load_u16_4x4(dst_ptr, dst_stride, &dd0, &dd1, &dd2, &dd3);

            uint8x8_t d01_u8, d23_u8;
            compute_basic_avg_4x4(dd0, dd1, dd2, dd3, d0, d1, d2, d3, round_offset_vec, &d01_u8, &d23_u8);

            store_u8_4x1(dst8_ptr + 0 * dst8_stride, d01_u8, 0);
            store_u8_4x1(dst8_ptr + 1 * dst8_stride, d01_u8, 1);
            store_u8_4x1(dst8_ptr + 2 * dst8_stride, d23_u8, 0);
            store_u8_4x1(dst8_ptr + 3 * dst8_stride, d23_u8, 1);
            dst8_ptr += 4 * dst8_stride;

            s0 = s4;
            s1 = s5;
            s2 = s6;
            s3 = s7;
            s4 = s8;
            s5 = s9;
            s6 = s10;
            src_ptr += 4 * src_stride;
            dst_ptr += 4 * dst_stride;
            h -= 4;
        } while (h != 0);
    } else {
        do {
            int16_t       *s      = src_ptr;
            CONV_BUF_TYPE *d      = dst_ptr;
            uint8_t       *d_u8   = dst8_ptr;
            int            height = h;

            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;

            do {
                int16x8_t s7, s8, s9, s10;
                load_s16_8x4(s, src_stride, &s7, &s8, &s9, &s10);

                uint16x8_t d0 = convolve8_8_2d_v(s0, s1, s2, s3, s4, s5, s6, s7, y_filter, offset_const);
                uint16x8_t d1 = convolve8_8_2d_v(s1, s2, s3, s4, s5, s6, s7, s8, y_filter, offset_const);
                uint16x8_t d2 = convolve8_8_2d_v(s2, s3, s4, s5, s6, s7, s8, s9, y_filter, offset_const);
                uint16x8_t d3 = convolve8_8_2d_v(s3, s4, s5, s6, s7, s8, s9, s10, y_filter, offset_const);

                uint16x8_t dd0, dd1, dd2, dd3;
                load_u16_8x4(d, dst_stride, &dd0, &dd1, &dd2, &dd3);

                uint8x8_t d0_u8, d1_u8, d2_u8, d3_u8;
                compute_basic_avg_8x4(
                    dd0, dd1, dd2, dd3, d0, d1, d2, d3, round_offset_vec, &d0_u8, &d1_u8, &d2_u8, &d3_u8);

                store_u8_8x4(d_u8, dst8_stride, d0_u8, d1_u8, d2_u8, d3_u8);
                d_u8 += 4 * dst8_stride;

                s0 = s4;
                s1 = s5;
                s2 = s6;
                s3 = s7;
                s4 = s8;
                s5 = s9;
                s6 = s10;
                s += 4 * src_stride;
                d += 4 * dst_stride;
                height -= 4;
            } while (height != 0);
            src_ptr += 8;
            dst_ptr += 8;
            dst8_ptr += 8;
            w -= 8;
        } while (w != 0);
    }
}

static INLINE void dist_wtd_convolve_2d_vert_8tap_neon(int16_t *src_ptr, const int src_stride,
                                                       ConvolveParams *conv_params, const int16x8_t y_filter, int h,
                                                       int w) {
    const int       bd           = 8;
    const int       offset_bits  = bd + 2 * FILTER_BITS - ROUND0_BITS;
    const int32x4_t offset_const = vdupq_n_s32(1 << offset_bits);

    CONV_BUF_TYPE *dst_ptr    = conv_params->dst;
    const int      dst_stride = conv_params->dst_stride;

    if (w == 4) {
        int16x4_t s0, s1, s2, s3, s4, s5, s6;
        load_s16_4x7(src_ptr, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6);
        src_ptr += 7 * src_stride;

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

            uint16x4_t d0 = convolve8_4_2d_v(s0, s1, s2, s3, s4, s5, s6, s7, y_filter, offset_const);
            uint16x4_t d1 = convolve8_4_2d_v(s1, s2, s3, s4, s5, s6, s7, s8, y_filter, offset_const);
            uint16x4_t d2 = convolve8_4_2d_v(s2, s3, s4, s5, s6, s7, s8, s9, y_filter, offset_const);
            uint16x4_t d3 = convolve8_4_2d_v(s3, s4, s5, s6, s7, s8, s9, s10, y_filter, offset_const);

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

            s0 = s4;
            s1 = s5;
            s2 = s6;
            s3 = s7;
            s4 = s8;
            s5 = s9;
            s6 = s10;
            src_ptr += 4 * src_stride;
            dst_ptr += 4 * dst_stride;
            h -= 4;
        } while (h != 0);
    } else {
        do {
            int16_t       *s      = src_ptr;
            CONV_BUF_TYPE *d      = dst_ptr;
            int            height = h;

            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;

            do {
                int16x8_t s7, s8, s9, s10;
                load_s16_8x4(s, src_stride, &s7, &s8, &s9, &s10);

                uint16x8_t d0 = convolve8_8_2d_v(s0, s1, s2, s3, s4, s5, s6, s7, y_filter, offset_const);
                uint16x8_t d1 = convolve8_8_2d_v(s1, s2, s3, s4, s5, s6, s7, s8, y_filter, offset_const);
                uint16x8_t d2 = convolve8_8_2d_v(s2, s3, s4, s5, s6, s7, s8, s9, y_filter, offset_const);
                uint16x8_t d3 = convolve8_8_2d_v(s3, s4, s5, s6, s7, s8, s9, s10, y_filter, offset_const);

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

                s0 = s4;
                s1 = s5;
                s2 = s6;
                s3 = s7;
                s4 = s8;
                s5 = s9;
                s6 = s10;
                s += 4 * src_stride;
                d += 4 * dst_stride;
                height -= 4;
            } while (height != 0);
            src_ptr += 8;
            dst_ptr += 8;
            w -= 8;
        } while (w != 0);
    }
}

#endif // AOM_AV1_COMMON_ARM_COMPOUND_CONVOLVE_NEON_H_
