/*
 * Copyright (c) 2018, 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 <smmintrin.h>
#include <immintrin.h>

#include "config/aom_dsp_rtcd.h"

#include "aom_ports/mem.h"
#include "aom_dsp/x86/synonyms.h"
#include "aom_dsp/x86/synonyms_avx2.h"

static INLINE void sse_w32_avx2(__m256i *sum, const uint8_t *a,
                                const uint8_t *b) {
  const __m256i v_a0 = yy_loadu_256(a);
  const __m256i v_b0 = yy_loadu_256(b);
  const __m256i v_a00_w = _mm256_cvtepu8_epi16(_mm256_castsi256_si128(v_a0));
  const __m256i v_a01_w =
      _mm256_cvtepu8_epi16(_mm256_extracti128_si256(v_a0, 1));
  const __m256i v_b00_w = _mm256_cvtepu8_epi16(_mm256_castsi256_si128(v_b0));
  const __m256i v_b01_w =
      _mm256_cvtepu8_epi16(_mm256_extracti128_si256(v_b0, 1));
  const __m256i v_d00_w = _mm256_sub_epi16(v_a00_w, v_b00_w);
  const __m256i v_d01_w = _mm256_sub_epi16(v_a01_w, v_b01_w);
  *sum = _mm256_add_epi32(*sum, _mm256_madd_epi16(v_d00_w, v_d00_w));
  *sum = _mm256_add_epi32(*sum, _mm256_madd_epi16(v_d01_w, v_d01_w));
}

static INLINE int64_t summary_all_avx2(const __m256i *sum_all) {
  int64_t sum;
  const __m256i sum0_4x64 =
      _mm256_cvtepu32_epi64(_mm256_castsi256_si128(*sum_all));
  const __m256i sum1_4x64 =
      _mm256_cvtepu32_epi64(_mm256_extracti128_si256(*sum_all, 1));
  const __m256i sum_4x64 = _mm256_add_epi64(sum0_4x64, sum1_4x64);
  const __m128i sum_2x64 = _mm_add_epi64(_mm256_castsi256_si128(sum_4x64),
                                         _mm256_extracti128_si256(sum_4x64, 1));
  const __m128i sum_1x64 = _mm_add_epi64(sum_2x64, _mm_srli_si128(sum_2x64, 8));

  xx_storel_64(&sum, sum_1x64);
  return sum;
}

int64_t aom_sse_avx2(const uint8_t *a, int a_stride, const uint8_t *b,
                     int b_stride, int width, int height) {
  int32_t y = 0;
  int64_t sse = 0;
  __m256i sum = _mm256_setzero_si256();
  switch (width) {
    case 4:
      do {
        const __m128i v_a0 = xx_loadl_32(a);
        const __m128i v_a1 = xx_loadl_32(a + a_stride);
        const __m128i v_a2 = xx_loadl_32(a + a_stride * 2);
        const __m128i v_a3 = xx_loadl_32(a + a_stride * 3);
        const __m128i v_b0 = xx_loadl_32(b);
        const __m128i v_b1 = xx_loadl_32(b + b_stride);
        const __m128i v_b2 = xx_loadl_32(b + b_stride * 2);
        const __m128i v_b3 = xx_loadl_32(b + b_stride * 3);
        const __m128i v_a0123 = _mm_unpacklo_epi64(
            _mm_unpacklo_epi32(v_a0, v_a1), _mm_unpacklo_epi32(v_a2, v_a3));
        const __m128i v_b0123 = _mm_unpacklo_epi64(
            _mm_unpacklo_epi32(v_b0, v_b1), _mm_unpacklo_epi32(v_b2, v_b3));
        const __m256i v_a_w = _mm256_cvtepu8_epi16(v_a0123);
        const __m256i v_b_w = _mm256_cvtepu8_epi16(v_b0123);
        const __m256i v_d_w = _mm256_sub_epi16(v_a_w, v_b_w);
        sum = _mm256_add_epi32(sum, _mm256_madd_epi16(v_d_w, v_d_w));
        a += a_stride << 2;
        b += b_stride << 2;
        y += 4;
      } while (y < height);
      sse = summary_all_avx2(&sum);
      break;
    case 8:
      do {
        const __m128i v_a0 = xx_loadl_64(a);
        const __m128i v_a1 = xx_loadl_64(a + a_stride);
        const __m128i v_b0 = xx_loadl_64(b);
        const __m128i v_b1 = xx_loadl_64(b + b_stride);
        const __m256i v_a_w =
            _mm256_cvtepu8_epi16(_mm_unpacklo_epi64(v_a0, v_a1));
        const __m256i v_b_w =
            _mm256_cvtepu8_epi16(_mm_unpacklo_epi64(v_b0, v_b1));
        const __m256i v_d_w = _mm256_sub_epi16(v_a_w, v_b_w);
        sum = _mm256_add_epi32(sum, _mm256_madd_epi16(v_d_w, v_d_w));
        a += a_stride << 1;
        b += b_stride << 1;
        y += 2;
      } while (y < height);
      sse = summary_all_avx2(&sum);
      break;
    case 16:
      do {
        const __m128i v_a0 = xx_loadu_128(a);
        const __m128i v_b0 = xx_loadu_128(b);
        const __m256i v_a_w = _mm256_cvtepu8_epi16(v_a0);
        const __m256i v_b_w = _mm256_cvtepu8_epi16(v_b0);
        const __m256i v_d_w = _mm256_sub_epi16(v_a_w, v_b_w);
        sum = _mm256_add_epi32(sum, _mm256_madd_epi16(v_d_w, v_d_w));
        a += a_stride;
        b += b_stride;
        y += 1;
      } while (y < height);
      sse = summary_all_avx2(&sum);
      break;
    case 32:
      do {
        sse_w32_avx2(&sum, a, b);
        a += a_stride;
        b += b_stride;
        y += 1;
      } while (y < height);
      sse = summary_all_avx2(&sum);
      break;
    case 64:
      do {
        sse_w32_avx2(&sum, a, b);
        sse_w32_avx2(&sum, a + 32, b + 32);
        a += a_stride;
        b += b_stride;
        y += 1;
      } while (y < height);
      sse = summary_all_avx2(&sum);
      break;
    case 128:
      do {
        sse_w32_avx2(&sum, a, b);
        sse_w32_avx2(&sum, a + 32, b + 32);
        sse_w32_avx2(&sum, a + 64, b + 64);
        sse_w32_avx2(&sum, a + 96, b + 96);
        a += a_stride;
        b += b_stride;
        y += 1;
      } while (y < height);
      sse = summary_all_avx2(&sum);
      break;
    default: break;
  }

  return sse;
}

static INLINE void highbd_sse_w16_avx2(__m256i *sum, const uint16_t *a,
                                       const uint16_t *b) {
  const __m256i v_a_w = yy_loadu_256(a);
  const __m256i v_b_w = yy_loadu_256(b);
  const __m256i v_d_w = _mm256_sub_epi16(v_a_w, v_b_w);
  *sum = _mm256_add_epi32(*sum, _mm256_madd_epi16(v_d_w, v_d_w));
}

int64_t aom_highbd_sse_avx2(const uint8_t *a8, int a_stride, const uint8_t *b8,
                            int b_stride, int width, int height) {
  int32_t y = 0;
  int64_t sse = 0;
  uint16_t *a = CONVERT_TO_SHORTPTR(a8);
  uint16_t *b = CONVERT_TO_SHORTPTR(b8);
  __m256i sum = _mm256_setzero_si256();
  switch (width) {
    case 4:
      do {
        const __m128i v_a0 = xx_loadl_64(a);
        const __m128i v_a1 = xx_loadl_64(a + a_stride);
        const __m128i v_a2 = xx_loadl_64(a + a_stride * 2);
        const __m128i v_a3 = xx_loadl_64(a + a_stride * 3);
        const __m128i v_b0 = xx_loadl_64(b);
        const __m128i v_b1 = xx_loadl_64(b + b_stride);
        const __m128i v_b2 = xx_loadl_64(b + b_stride * 2);
        const __m128i v_b3 = xx_loadl_64(b + b_stride * 3);
        const __m256i v_a_w = yy_set_m128i(_mm_unpacklo_epi64(v_a0, v_a1),
                                           _mm_unpacklo_epi64(v_a2, v_a3));
        const __m256i v_b_w = yy_set_m128i(_mm_unpacklo_epi64(v_b0, v_b1),
                                           _mm_unpacklo_epi64(v_b2, v_b3));
        const __m256i v_d_w = _mm256_sub_epi16(v_a_w, v_b_w);
        sum = _mm256_add_epi32(sum, _mm256_madd_epi16(v_d_w, v_d_w));
        a += a_stride << 2;
        b += b_stride << 2;
        y += 4;
      } while (y < height);
      sse = summary_all_avx2(&sum);
      break;
    case 8:
      do {
        const __m256i v_a_w = yy_loadu2_128(a + a_stride, a);
        const __m256i v_b_w = yy_loadu2_128(b + b_stride, b);
        const __m256i v_d_w = _mm256_sub_epi16(v_a_w, v_b_w);
        sum = _mm256_add_epi32(sum, _mm256_madd_epi16(v_d_w, v_d_w));
        a += a_stride << 1;
        b += b_stride << 1;
        y += 2;
      } while (y < height);
      sse = summary_all_avx2(&sum);
      break;
    case 16:
      do {
        highbd_sse_w16_avx2(&sum, a, b);
        a += a_stride;
        b += b_stride;
        y += 1;
      } while (y < height);
      sse = summary_all_avx2(&sum);
      break;
    case 32:
      do {
        highbd_sse_w16_avx2(&sum, a, b);
        highbd_sse_w16_avx2(&sum, a + 16, b + 16);
        a += a_stride;
        b += b_stride;
        y += 1;
      } while (y < height);
      sse = summary_all_avx2(&sum);
      break;
    case 64:
      do {
        highbd_sse_w16_avx2(&sum, a, b);
        highbd_sse_w16_avx2(&sum, a + 16 * 1, b + 16 * 1);
        highbd_sse_w16_avx2(&sum, a + 16 * 2, b + 16 * 2);
        highbd_sse_w16_avx2(&sum, a + 16 * 3, b + 16 * 3);
        a += a_stride;
        b += b_stride;
        y += 1;
      } while (y < height);
      sse = summary_all_avx2(&sum);
      break;
    case 128:
      do {
        highbd_sse_w16_avx2(&sum, a, b);
        highbd_sse_w16_avx2(&sum, a + 16 * 1, b + 16 * 1);
        highbd_sse_w16_avx2(&sum, a + 16 * 2, b + 16 * 2);
        highbd_sse_w16_avx2(&sum, a + 16 * 3, b + 16 * 3);
        highbd_sse_w16_avx2(&sum, a + 16 * 4, b + 16 * 4);
        highbd_sse_w16_avx2(&sum, a + 16 * 5, b + 16 * 5);
        highbd_sse_w16_avx2(&sum, a + 16 * 6, b + 16 * 6);
        highbd_sse_w16_avx2(&sum, a + 16 * 7, b + 16 * 7);
        a += a_stride;
        b += b_stride;
        y += 1;
      } while (y < height);
      sse = summary_all_avx2(&sum);
      break;
    default: break;
  }
  return sse;
}