/*
 * 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 <arm_neon.h>
#include <assert.h>
#include <stdbool.h>
#include <arm_neon_sve_bridge.h>

#include "aom_dsp/aom_dsp_common.h"
#include "aom_dsp/arm/aom_neon_sve_bridge.h"
#include "aom_dsp/arm/mem_neon.h"
#include "aom_dsp/arm/transpose_neon.h"
#include "aom_ports/mem.h"
#include "av1/common/scale.h"
#include "av1/common/warped_motion.h"
#include "config/av1_rtcd.h"
#include "highbd_warp_plane_neon.h"

static AOM_FORCE_INLINE int16x8_t
highbd_horizontal_filter_4x1_f4(int16x8_t rv0, int16x8_t rv1, int16x8_t rv2,
                                int16x8_t rv3, int bd, int sx, int alpha) {
  int16x8_t f[4];
  load_filters_4(f, sx, alpha);

  int64x2_t m0 = aom_sdotq_s16(vdupq_n_s64(0), rv0, f[0]);
  int64x2_t m1 = aom_sdotq_s16(vdupq_n_s64(0), rv1, f[1]);
  int64x2_t m2 = aom_sdotq_s16(vdupq_n_s64(0), rv2, f[2]);
  int64x2_t m3 = aom_sdotq_s16(vdupq_n_s64(0), rv3, f[3]);

  int64x2_t m01 = vpaddq_s64(m0, m1);
  int64x2_t m23 = vpaddq_s64(m2, m3);

  const int round0 = bd == 12 ? ROUND0_BITS + 2 : ROUND0_BITS;
  const int offset_bits_horiz = bd + FILTER_BITS - 1;

  int32x4_t res = vcombine_s32(vmovn_s64(m01), vmovn_s64(m23));
  res = vaddq_s32(res, vdupq_n_s32(1 << offset_bits_horiz));
  res = vrshlq_s32(res, vdupq_n_s32(-round0));
  return vcombine_s16(vmovn_s32(res), vdup_n_s16(0));
}

static AOM_FORCE_INLINE int16x8_t highbd_horizontal_filter_8x1_f8(
    int16x8_t rv0, int16x8_t rv1, int16x8_t rv2, int16x8_t rv3, int16x8_t rv4,
    int16x8_t rv5, int16x8_t rv6, int16x8_t rv7, int bd, int sx, int alpha) {
  int16x8_t f[8];
  load_filters_8(f, sx, alpha);

  int64x2_t m0 = aom_sdotq_s16(vdupq_n_s64(0), rv0, f[0]);
  int64x2_t m1 = aom_sdotq_s16(vdupq_n_s64(0), rv1, f[1]);
  int64x2_t m2 = aom_sdotq_s16(vdupq_n_s64(0), rv2, f[2]);
  int64x2_t m3 = aom_sdotq_s16(vdupq_n_s64(0), rv3, f[3]);
  int64x2_t m4 = aom_sdotq_s16(vdupq_n_s64(0), rv4, f[4]);
  int64x2_t m5 = aom_sdotq_s16(vdupq_n_s64(0), rv5, f[5]);
  int64x2_t m6 = aom_sdotq_s16(vdupq_n_s64(0), rv6, f[6]);
  int64x2_t m7 = aom_sdotq_s16(vdupq_n_s64(0), rv7, f[7]);

  int64x2_t m01 = vpaddq_s64(m0, m1);
  int64x2_t m23 = vpaddq_s64(m2, m3);
  int64x2_t m45 = vpaddq_s64(m4, m5);
  int64x2_t m67 = vpaddq_s64(m6, m7);

  const int round0 = bd == 12 ? ROUND0_BITS + 2 : ROUND0_BITS;
  const int offset_bits_horiz = bd + FILTER_BITS - 1;

  int32x4_t res0 = vcombine_s32(vmovn_s64(m01), vmovn_s64(m23));
  int32x4_t res1 = vcombine_s32(vmovn_s64(m45), vmovn_s64(m67));
  res0 = vaddq_s32(res0, vdupq_n_s32(1 << offset_bits_horiz));
  res1 = vaddq_s32(res1, vdupq_n_s32(1 << offset_bits_horiz));
  res0 = vrshlq_s32(res0, vdupq_n_s32(-round0));
  res1 = vrshlq_s32(res1, vdupq_n_s32(-round0));
  return vcombine_s16(vmovn_s32(res0), vmovn_s32(res1));
}

static AOM_FORCE_INLINE int16x8_t
highbd_horizontal_filter_4x1_f1(int16x8_t rv0, int16x8_t rv1, int16x8_t rv2,
                                int16x8_t rv3, int bd, int sx) {
  int16x8_t f = load_filters_1(sx);

  int64x2_t m0 = aom_sdotq_s16(vdupq_n_s64(0), rv0, f);
  int64x2_t m1 = aom_sdotq_s16(vdupq_n_s64(0), rv1, f);
  int64x2_t m2 = aom_sdotq_s16(vdupq_n_s64(0), rv2, f);
  int64x2_t m3 = aom_sdotq_s16(vdupq_n_s64(0), rv3, f);

  int64x2_t m01 = vpaddq_s64(m0, m1);
  int64x2_t m23 = vpaddq_s64(m2, m3);

  const int round0 = bd == 12 ? ROUND0_BITS + 2 : ROUND0_BITS;
  const int offset_bits_horiz = bd + FILTER_BITS - 1;

  int32x4_t res = vcombine_s32(vmovn_s64(m01), vmovn_s64(m23));
  res = vaddq_s32(res, vdupq_n_s32(1 << offset_bits_horiz));
  res = vrshlq_s32(res, vdupq_n_s32(-round0));
  return vcombine_s16(vmovn_s32(res), vdup_n_s16(0));
}

static AOM_FORCE_INLINE int16x8_t highbd_horizontal_filter_8x1_f1(
    int16x8_t rv0, int16x8_t rv1, int16x8_t rv2, int16x8_t rv3, int16x8_t rv4,
    int16x8_t rv5, int16x8_t rv6, int16x8_t rv7, int bd, int sx) {
  int16x8_t f = load_filters_1(sx);

  int64x2_t m0 = aom_sdotq_s16(vdupq_n_s64(0), rv0, f);
  int64x2_t m1 = aom_sdotq_s16(vdupq_n_s64(0), rv1, f);
  int64x2_t m2 = aom_sdotq_s16(vdupq_n_s64(0), rv2, f);
  int64x2_t m3 = aom_sdotq_s16(vdupq_n_s64(0), rv3, f);
  int64x2_t m4 = aom_sdotq_s16(vdupq_n_s64(0), rv4, f);
  int64x2_t m5 = aom_sdotq_s16(vdupq_n_s64(0), rv5, f);
  int64x2_t m6 = aom_sdotq_s16(vdupq_n_s64(0), rv6, f);
  int64x2_t m7 = aom_sdotq_s16(vdupq_n_s64(0), rv7, f);

  int64x2_t m01 = vpaddq_s64(m0, m1);
  int64x2_t m23 = vpaddq_s64(m2, m3);
  int64x2_t m45 = vpaddq_s64(m4, m5);
  int64x2_t m67 = vpaddq_s64(m6, m7);

  const int round0 = bd == 12 ? ROUND0_BITS + 2 : ROUND0_BITS;
  const int offset_bits_horiz = bd + FILTER_BITS - 1;

  int32x4_t res0 = vcombine_s32(vmovn_s64(m01), vmovn_s64(m23));
  int32x4_t res1 = vcombine_s32(vmovn_s64(m45), vmovn_s64(m67));
  res0 = vaddq_s32(res0, vdupq_n_s32(1 << offset_bits_horiz));
  res1 = vaddq_s32(res1, vdupq_n_s32(1 << offset_bits_horiz));
  res0 = vrshlq_s32(res0, vdupq_n_s32(-round0));
  res1 = vrshlq_s32(res1, vdupq_n_s32(-round0));
  return vcombine_s16(vmovn_s32(res0), vmovn_s32(res1));
}

static AOM_FORCE_INLINE int32x4_t vertical_filter_4x1_f1(const int16x8_t *tmp,
                                                         int sy) {
  const int16x8_t f = load_filters_1(sy);
  const int16x4_t f0123 = vget_low_s16(f);
  const int16x4_t f4567 = vget_high_s16(f);

  // No benefit to using SDOT here, the cost of rearrangement is too high.
  int32x4_t m0123 = vmull_lane_s16(vget_low_s16(tmp[0]), f0123, 0);
  m0123 = vmlal_lane_s16(m0123, vget_low_s16(tmp[1]), f0123, 1);
  m0123 = vmlal_lane_s16(m0123, vget_low_s16(tmp[2]), f0123, 2);
  m0123 = vmlal_lane_s16(m0123, vget_low_s16(tmp[3]), f0123, 3);
  m0123 = vmlal_lane_s16(m0123, vget_low_s16(tmp[4]), f4567, 0);
  m0123 = vmlal_lane_s16(m0123, vget_low_s16(tmp[5]), f4567, 1);
  m0123 = vmlal_lane_s16(m0123, vget_low_s16(tmp[6]), f4567, 2);
  m0123 = vmlal_lane_s16(m0123, vget_low_s16(tmp[7]), f4567, 3);
  return m0123;
}

static AOM_FORCE_INLINE int32x4x2_t vertical_filter_8x1_f1(const int16x8_t *tmp,
                                                           int sy) {
  const int16x8_t f = load_filters_1(sy);
  const int16x4_t f0123 = vget_low_s16(f);
  const int16x4_t f4567 = vget_high_s16(f);

  // No benefit to using SDOT here, the cost of rearrangement is too high.
  int32x4_t m0123 = vmull_lane_s16(vget_low_s16(tmp[0]), f0123, 0);
  m0123 = vmlal_lane_s16(m0123, vget_low_s16(tmp[1]), f0123, 1);
  m0123 = vmlal_lane_s16(m0123, vget_low_s16(tmp[2]), f0123, 2);
  m0123 = vmlal_lane_s16(m0123, vget_low_s16(tmp[3]), f0123, 3);
  m0123 = vmlal_lane_s16(m0123, vget_low_s16(tmp[4]), f4567, 0);
  m0123 = vmlal_lane_s16(m0123, vget_low_s16(tmp[5]), f4567, 1);
  m0123 = vmlal_lane_s16(m0123, vget_low_s16(tmp[6]), f4567, 2);
  m0123 = vmlal_lane_s16(m0123, vget_low_s16(tmp[7]), f4567, 3);

  int32x4_t m4567 = vmull_lane_s16(vget_high_s16(tmp[0]), f0123, 0);
  m4567 = vmlal_lane_s16(m4567, vget_high_s16(tmp[1]), f0123, 1);
  m4567 = vmlal_lane_s16(m4567, vget_high_s16(tmp[2]), f0123, 2);
  m4567 = vmlal_lane_s16(m4567, vget_high_s16(tmp[3]), f0123, 3);
  m4567 = vmlal_lane_s16(m4567, vget_high_s16(tmp[4]), f4567, 0);
  m4567 = vmlal_lane_s16(m4567, vget_high_s16(tmp[5]), f4567, 1);
  m4567 = vmlal_lane_s16(m4567, vget_high_s16(tmp[6]), f4567, 2);
  m4567 = vmlal_lane_s16(m4567, vget_high_s16(tmp[7]), f4567, 3);
  return (int32x4x2_t){ { m0123, m4567 } };
}

static AOM_FORCE_INLINE int32x4_t vertical_filter_4x1_f4(const int16x8_t *tmp,
                                                         int sy, int gamma) {
  int16x8_t s0, s1, s2, s3;
  transpose_elems_s16_4x8(
      vget_low_s16(tmp[0]), vget_low_s16(tmp[1]), vget_low_s16(tmp[2]),
      vget_low_s16(tmp[3]), vget_low_s16(tmp[4]), vget_low_s16(tmp[5]),
      vget_low_s16(tmp[6]), vget_low_s16(tmp[7]), &s0, &s1, &s2, &s3);

  int16x8_t f[4];
  load_filters_4(f, sy, gamma);

  int64x2_t m0 = aom_sdotq_s16(vdupq_n_s64(0), s0, f[0]);
  int64x2_t m1 = aom_sdotq_s16(vdupq_n_s64(0), s1, f[1]);
  int64x2_t m2 = aom_sdotq_s16(vdupq_n_s64(0), s2, f[2]);
  int64x2_t m3 = aom_sdotq_s16(vdupq_n_s64(0), s3, f[3]);

  int64x2_t m01 = vpaddq_s64(m0, m1);
  int64x2_t m23 = vpaddq_s64(m2, m3);
  return vcombine_s32(vmovn_s64(m01), vmovn_s64(m23));
}

static AOM_FORCE_INLINE int32x4x2_t vertical_filter_8x1_f8(const int16x8_t *tmp,
                                                           int sy, int gamma) {
  int16x8_t s0 = tmp[0];
  int16x8_t s1 = tmp[1];
  int16x8_t s2 = tmp[2];
  int16x8_t s3 = tmp[3];
  int16x8_t s4 = tmp[4];
  int16x8_t s5 = tmp[5];
  int16x8_t s6 = tmp[6];
  int16x8_t s7 = tmp[7];
  transpose_elems_inplace_s16_8x8(&s0, &s1, &s2, &s3, &s4, &s5, &s6, &s7);

  int16x8_t f[8];
  load_filters_8(f, sy, gamma);

  int64x2_t m0 = aom_sdotq_s16(vdupq_n_s64(0), s0, f[0]);
  int64x2_t m1 = aom_sdotq_s16(vdupq_n_s64(0), s1, f[1]);
  int64x2_t m2 = aom_sdotq_s16(vdupq_n_s64(0), s2, f[2]);
  int64x2_t m3 = aom_sdotq_s16(vdupq_n_s64(0), s3, f[3]);
  int64x2_t m4 = aom_sdotq_s16(vdupq_n_s64(0), s4, f[4]);
  int64x2_t m5 = aom_sdotq_s16(vdupq_n_s64(0), s5, f[5]);
  int64x2_t m6 = aom_sdotq_s16(vdupq_n_s64(0), s6, f[6]);
  int64x2_t m7 = aom_sdotq_s16(vdupq_n_s64(0), s7, f[7]);

  int64x2_t m01 = vpaddq_s64(m0, m1);
  int64x2_t m23 = vpaddq_s64(m2, m3);
  int64x2_t m45 = vpaddq_s64(m4, m5);
  int64x2_t m67 = vpaddq_s64(m6, m7);

  int32x4x2_t ret;
  ret.val[0] = vcombine_s32(vmovn_s64(m01), vmovn_s64(m23));
  ret.val[1] = vcombine_s32(vmovn_s64(m45), vmovn_s64(m67));
  return ret;
}

void av1_highbd_warp_affine_sve(const int32_t *mat, const uint16_t *ref,
                                int width, int height, int stride,
                                uint16_t *pred, int p_col, int p_row,
                                int p_width, int p_height, int p_stride,
                                int subsampling_x, int subsampling_y, int bd,
                                ConvolveParams *conv_params, int16_t alpha,
                                int16_t beta, int16_t gamma, int16_t delta) {
  highbd_warp_affine_common(mat, ref, width, height, stride, pred, p_col, p_row,
                            p_width, p_height, p_stride, subsampling_x,
                            subsampling_y, bd, conv_params, alpha, beta, gamma,
                            delta);
}