/*
* 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.
*/

#include "EbDefinitions.h"
#include "mem_neon.h"
#include "filter.h"
#include "transpose_neon.h"
#include "common_dsp_rtcd.h"

static INLINE int16x4_t convolve8_4(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 filter) {
    const int16x4_t filter_lo = vget_low_s16(filter);
    const int16x4_t filter_hi = vget_high_s16(filter);
    int16x4_t       sum;

    sum = vmul_lane_s16(s0, filter_lo, 0);
    sum = vmla_lane_s16(sum, s1, filter_lo, 1);
    sum = vmla_lane_s16(sum, s2, filter_lo, 2);
    sum = vmla_lane_s16(sum, s5, filter_hi, 1);
    sum = vmla_lane_s16(sum, s6, filter_hi, 2);
    sum = vmla_lane_s16(sum, s7, filter_hi, 3);
    sum = vqadd_s16(sum, vmul_lane_s16(s3, filter_lo, 3));
    sum = vqadd_s16(sum, vmul_lane_s16(s4, filter_hi, 0));
    return sum;
}

static INLINE uint8x8_t convolve8_8(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 filter) {
    const int16x4_t filter_lo = vget_low_s16(filter);
    const int16x4_t filter_hi = vget_high_s16(filter);
    int16x8_t       sum;

    sum = vmulq_lane_s16(s0, filter_lo, 0);
    sum = vmlaq_lane_s16(sum, s1, filter_lo, 1);
    sum = vmlaq_lane_s16(sum, s2, filter_lo, 2);
    sum = vmlaq_lane_s16(sum, s5, filter_hi, 1);
    sum = vmlaq_lane_s16(sum, s6, filter_hi, 2);
    sum = vmlaq_lane_s16(sum, s7, filter_hi, 3);
    sum = vqaddq_s16(sum, vmulq_lane_s16(s3, filter_lo, 3));
    sum = vqaddq_s16(sum, vmulq_lane_s16(s4, filter_hi, 0));
    return vqrshrun_n_s16(sum, FILTER_BITS);
}

void svt_aom_convolve8_horiz_neon(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride,
                                  const int16_t *filter_x, int x_step_q4, const int16_t *filter_y, int y_step_q4, int w,
                                  int h) {
    const int16x8_t filter = vld1q_s16(filter_x);

    assert((intptr_t)dst % 4 == 0);
    assert(dst_stride % 4 == 0);

    (void)x_step_q4;
    (void)filter_y;
    (void)y_step_q4;

    src -= ((SUBPEL_TAPS / 2) - 1);

    if (h == 4) {
        uint8x8_t t0, t1, t2, t3, d01, d23;
        int16x4_t s0, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10, d0, d1, d2, d3;

        load_u8_8x4(src, src_stride, &t0, &t1, &t2, &t3);
        transpose_elems_inplace_u8_8x4(&t0, &t1, &t2, &t3);
        s0 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
        s1 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
        s2 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));
        s3 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t3)));
        s4 = vget_high_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
        s5 = vget_high_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
        s6 = vget_high_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));

        src += 7;

        do {
            load_u8_8x4(src, src_stride, &t0, &t1, &t2, &t3);
            transpose_elems_inplace_u8_8x4(&t0, &t1, &t2, &t3);
            s7  = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
            s8  = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
            s9  = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));
            s10 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t3)));

            d0  = convolve8_4(s0, s1, s2, s3, s4, s5, s6, s7, filter);
            d1  = convolve8_4(s1, s2, s3, s4, s5, s6, s7, s8, filter);
            d2  = convolve8_4(s2, s3, s4, s5, s6, s7, s8, s9, filter);
            d3  = convolve8_4(s3, s4, s5, s6, s7, s8, s9, s10, filter);
            d01 = vqrshrun_n_s16(vcombine_s16(d0, d1), FILTER_BITS);
            d23 = vqrshrun_n_s16(vcombine_s16(d2, d3), FILTER_BITS);

            transpose_elems_inplace_u8_4x4(&d01, &d23);

            store_u8_4x1(dst + 0 * dst_stride, d01, 0);
            store_u8_4x1(dst + 1 * dst_stride, d23, 0);
            store_u8_4x1(dst + 2 * dst_stride, d01, 1);
            store_u8_4x1(dst + 3 * dst_stride, d23, 1);

            s0 = s4;
            s1 = s5;
            s2 = s6;
            s3 = s7;
            s4 = s8;
            s5 = s9;
            s6 = s10;
            src += 4;
            dst += 4;
            w -= 4;
        } while (w != 0);
    } else {
        uint8x8_t t0, t1, t2, t3, t4, t5, t6, t7, d0, d1, d2, d3;
        int16x8_t s0, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10;

        if (w == 4) {
            do {
                load_u8_8x8(src, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
                transpose_elems_inplace_u8_8x8(&t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
                s0 = vreinterpretq_s16_u16(vmovl_u8(t0));
                s1 = vreinterpretq_s16_u16(vmovl_u8(t1));
                s2 = vreinterpretq_s16_u16(vmovl_u8(t2));
                s3 = vreinterpretq_s16_u16(vmovl_u8(t3));
                s4 = vreinterpretq_s16_u16(vmovl_u8(t4));
                s5 = vreinterpretq_s16_u16(vmovl_u8(t5));
                s6 = vreinterpretq_s16_u16(vmovl_u8(t6));

                load_u8_8x8(src + 7, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
                transpose_elems_u8_4x8(t0, t1, t2, t3, t4, t5, t6, t7, &t0, &t1, &t2, &t3);
                s7  = vreinterpretq_s16_u16(vmovl_u8(t0));
                s8  = vreinterpretq_s16_u16(vmovl_u8(t1));
                s9  = vreinterpretq_s16_u16(vmovl_u8(t2));
                s10 = vreinterpretq_s16_u16(vmovl_u8(t3));

                d0 = convolve8_8(s0, s1, s2, s3, s4, s5, s6, s7, filter);
                d1 = convolve8_8(s1, s2, s3, s4, s5, s6, s7, s8, filter);
                d2 = convolve8_8(s2, s3, s4, s5, s6, s7, s8, s9, filter);
                d3 = convolve8_8(s3, s4, s5, s6, s7, s8, s9, s10, filter);

                transpose_elems_inplace_u8_8x4(&d0, &d1, &d2, &d3);

                store_u8_4x1(dst + 0 * dst_stride, d0, 0);
                store_u8_4x1(dst + 1 * dst_stride, d1, 0);
                store_u8_4x1(dst + 2 * dst_stride, d2, 0);
                store_u8_4x1(dst + 3 * dst_stride, d3, 0);
                store_u8_4x1(dst + 4 * dst_stride, d0, 1);
                store_u8_4x1(dst + 5 * dst_stride, d1, 1);
                store_u8_4x1(dst + 6 * dst_stride, d2, 1);
                store_u8_4x1(dst + 7 * dst_stride, d3, 1);

                src += 8 * src_stride;
                dst += 8 * dst_stride;
                h -= 8;
            } while (h > 0);
        } else {
            uint8x8_t      d4, d5, d6, d7;
            int16x8_t      s11, s12, s13, s14;
            int            width;
            const uint8_t *s;
            uint8_t       *d;

            do {
                load_u8_8x8(src, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
                transpose_elems_inplace_u8_8x8(&t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
                s0 = vreinterpretq_s16_u16(vmovl_u8(t0));
                s1 = vreinterpretq_s16_u16(vmovl_u8(t1));
                s2 = vreinterpretq_s16_u16(vmovl_u8(t2));
                s3 = vreinterpretq_s16_u16(vmovl_u8(t3));
                s4 = vreinterpretq_s16_u16(vmovl_u8(t4));
                s5 = vreinterpretq_s16_u16(vmovl_u8(t5));
                s6 = vreinterpretq_s16_u16(vmovl_u8(t6));

                width = w;
                s     = src + 7;
                d     = dst;

                do {
                    load_u8_8x8(s, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
                    transpose_elems_inplace_u8_8x8(&t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
                    s7  = vreinterpretq_s16_u16(vmovl_u8(t0));
                    s8  = vreinterpretq_s16_u16(vmovl_u8(t1));
                    s9  = vreinterpretq_s16_u16(vmovl_u8(t2));
                    s10 = vreinterpretq_s16_u16(vmovl_u8(t3));
                    s11 = vreinterpretq_s16_u16(vmovl_u8(t4));
                    s12 = vreinterpretq_s16_u16(vmovl_u8(t5));
                    s13 = vreinterpretq_s16_u16(vmovl_u8(t6));
                    s14 = vreinterpretq_s16_u16(vmovl_u8(t7));

                    d0 = convolve8_8(s0, s1, s2, s3, s4, s5, s6, s7, filter);
                    d1 = convolve8_8(s1, s2, s3, s4, s5, s6, s7, s8, filter);
                    d2 = convolve8_8(s2, s3, s4, s5, s6, s7, s8, s9, filter);
                    d3 = convolve8_8(s3, s4, s5, s6, s7, s8, s9, s10, filter);
                    d4 = convolve8_8(s4, s5, s6, s7, s8, s9, s10, s11, filter);
                    d5 = convolve8_8(s5, s6, s7, s8, s9, s10, s11, s12, filter);
                    d6 = convolve8_8(s6, s7, s8, s9, s10, s11, s12, s13, filter);
                    d7 = convolve8_8(s7, s8, s9, s10, s11, s12, s13, s14, filter);

                    transpose_elems_inplace_u8_8x8(&d0, &d1, &d2, &d3, &d4, &d5, &d6, &d7);

                    store_u8_8x8(d, dst_stride, d0, d1, d2, d3, d4, d5, d6, d7);

                    s0 = s8;
                    s1 = s9;
                    s2 = s10;
                    s3 = s11;
                    s4 = s12;
                    s5 = s13;
                    s6 = s14;
                    s += 8;
                    d += 8;
                    width -= 8;
                } while (width != 0);
                src += 8 * src_stride;
                dst += 8 * dst_stride;
                h -= 8;
            } while (h > 0);
        }
    }
}

void svt_aom_convolve8_vert_neon(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride,
                                 const int16_t *filter_x, int x_step_q4, const int16_t *filter_y, int y_step_q4, int w,
                                 int h) {
    const int16x8_t filter = vld1q_s16(filter_y);

    assert((intptr_t)dst % 4 == 0);
    assert(dst_stride % 4 == 0);

    (void)filter_x;
    (void)x_step_q4;
    (void)y_step_q4;

    src -= ((SUBPEL_TAPS / 2) - 1) * src_stride;

    if (w == 4) {
        uint8x8_t t0, t1, t2, t3, t4, t5, t6, d01, d23;
        int16x4_t s0, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10, d0, d1, d2, d3;

        load_u8_8x7(src, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6);
        s0 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
        s1 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
        s2 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));
        s3 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t3)));
        s4 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t4)));
        s5 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t5)));
        s6 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t6)));

        src += 7 * src_stride;

        do {
            load_u8_8x4(src, src_stride, &t0, &t1, &t2, &t3);
            s7  = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
            s8  = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
            s9  = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));
            s10 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t3)));

            d0  = convolve8_4(s0, s1, s2, s3, s4, s5, s6, s7, filter);
            d1  = convolve8_4(s1, s2, s3, s4, s5, s6, s7, s8, filter);
            d2  = convolve8_4(s2, s3, s4, s5, s6, s7, s8, s9, filter);
            d3  = convolve8_4(s3, s4, s5, s6, s7, s8, s9, s10, filter);
            d01 = vqrshrun_n_s16(vcombine_s16(d0, d1), FILTER_BITS);
            d23 = vqrshrun_n_s16(vcombine_s16(d2, d3), FILTER_BITS);

            store_u8_4x1(dst + 0 * dst_stride, d01, 0);
            store_u8_4x1(dst + 1 * dst_stride, d01, 1);
            store_u8_4x1(dst + 2 * dst_stride, d23, 0);
            store_u8_4x1(dst + 3 * dst_stride, d23, 1);

            s0 = s4;
            s1 = s5;
            s2 = s6;
            s3 = s7;
            s4 = s8;
            s5 = s9;
            s6 = s10;
            src += 4 * src_stride;
            dst += 4 * dst_stride;
            h -= 4;
        } while (h != 0);
    } else {
        uint8x8_t      t0, t1, t2, t3, t4, t5, t6, d0, d1, d2, d3;
        int16x8_t      s0, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10;
        int            height;
        const uint8_t *s;
        uint8_t       *d;

        do {
            load_u8_8x7(src, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6);
            s0 = vreinterpretq_s16_u16(vmovl_u8(t0));
            s1 = vreinterpretq_s16_u16(vmovl_u8(t1));
            s2 = vreinterpretq_s16_u16(vmovl_u8(t2));
            s3 = vreinterpretq_s16_u16(vmovl_u8(t3));
            s4 = vreinterpretq_s16_u16(vmovl_u8(t4));
            s5 = vreinterpretq_s16_u16(vmovl_u8(t5));
            s6 = vreinterpretq_s16_u16(vmovl_u8(t6));

            height = h;
            s      = src + 7 * src_stride;
            d      = dst;

            do {
                load_u8_8x4(s, src_stride, &t0, &t1, &t2, &t3);
                s7  = vreinterpretq_s16_u16(vmovl_u8(t0));
                s8  = vreinterpretq_s16_u16(vmovl_u8(t1));
                s9  = vreinterpretq_s16_u16(vmovl_u8(t2));
                s10 = vreinterpretq_s16_u16(vmovl_u8(t3));

                d0 = convolve8_8(s0, s1, s2, s3, s4, s5, s6, s7, filter);
                d1 = convolve8_8(s1, s2, s3, s4, s5, s6, s7, s8, filter);
                d2 = convolve8_8(s2, s3, s4, s5, s6, s7, s8, s9, filter);
                d3 = convolve8_8(s3, s4, s5, s6, s7, s8, s9, s10, filter);

                store_u8_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 += 8;
            dst += 8;
            w -= 8;
        } while (w != 0);
    }
}
