/*
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include <emmintrin.h>  // SSE2
#include <stdint.h>

//#include "vpx_ports/mem.h"

typedef void (*getNxMvar_fn_t)(const unsigned char *src, int src_stride,
                               const unsigned char *ref, int ref_stride,
                               unsigned int *sse, int *sum);

unsigned int vpx_get_mb_ss_sse2(const int16_t *src) {
  __m128i vsum = _mm_setzero_si128();
  int i;

  for (i = 0; i < 32; ++i) {
    const __m128i v = _mm_loadu_si128((const __m128i *)src);
    vsum = _mm_add_epi32(vsum, _mm_madd_epi16(v, v));
    src += 8;
  }

  vsum = _mm_add_epi32(vsum, _mm_srli_si128(vsum, 8));
  vsum = _mm_add_epi32(vsum, _mm_srli_si128(vsum, 4));
  return _mm_cvtsi128_si32(vsum);
}

#define READ64(p, stride, i)                                  \
  _mm_unpacklo_epi8(                                          \
      _mm_cvtsi32_si128(*(const uint32_t *)(p + i * stride)), \
      _mm_cvtsi32_si128(*(const uint32_t *)(p + (i + 1) * stride)))

static void get4x4var_sse2(const uint8_t *src, int src_stride,
                           const uint8_t *ref, int ref_stride,
                           unsigned int *sse, int *sum) {
  const __m128i zero = _mm_setzero_si128();
  const __m128i src0 = _mm_unpacklo_epi8(READ64(src, src_stride, 0), zero);
  const __m128i src1 = _mm_unpacklo_epi8(READ64(src, src_stride, 2), zero);
  const __m128i ref0 = _mm_unpacklo_epi8(READ64(ref, ref_stride, 0), zero);
  const __m128i ref1 = _mm_unpacklo_epi8(READ64(ref, ref_stride, 2), zero);
  const __m128i diff0 = _mm_sub_epi16(src0, ref0);
  const __m128i diff1 = _mm_sub_epi16(src1, ref1);

  if ( sum ) {
    // sum
    __m128i vsum = _mm_add_epi16(diff0, diff1);
    vsum = _mm_add_epi16(vsum, _mm_srli_si128(vsum, 8));
    vsum = _mm_add_epi16(vsum, _mm_srli_si128(vsum, 4));
    vsum = _mm_add_epi16(vsum, _mm_srli_si128(vsum, 2));
    *sum = (int16_t)_mm_extract_epi16(vsum, 0);
  }

  // sse
  __m128i vsum =
      _mm_add_epi32(_mm_madd_epi16(diff0, diff0), _mm_madd_epi16(diff1, diff1));
  vsum = _mm_add_epi32(vsum, _mm_srli_si128(vsum, 8));
  vsum = _mm_add_epi32(vsum, _mm_srli_si128(vsum, 4));
  *sse = _mm_cvtsi128_si32(vsum);
}

void vpx_get8x8var_sse2(const uint8_t *src, int src_stride, const uint8_t *ref,
                        int ref_stride, unsigned int *sse, int *sum) {
  const __m128i zero = _mm_setzero_si128();
  __m128i vsum = _mm_setzero_si128();
  __m128i vsse = _mm_setzero_si128();
  int i;

  for (i = 0; i < 8; i += 2) {
    const __m128i src0 = _mm_unpacklo_epi8(
        _mm_loadl_epi64((const __m128i *)(src + i * src_stride)), zero);
    const __m128i ref0 = _mm_unpacklo_epi8(
        _mm_loadl_epi64((const __m128i *)(ref + i * ref_stride)), zero);
    const __m128i diff0 = _mm_sub_epi16(src0, ref0);

    const __m128i src1 = _mm_unpacklo_epi8(
        _mm_loadl_epi64((const __m128i *)(src + (i + 1) * src_stride)), zero);
    const __m128i ref1 = _mm_unpacklo_epi8(
        _mm_loadl_epi64((const __m128i *)(ref + (i + 1) * ref_stride)), zero);
    const __m128i diff1 = _mm_sub_epi16(src1, ref1);

    vsum = _mm_add_epi16(vsum, diff0);
    vsum = _mm_add_epi16(vsum, diff1);
    vsse = _mm_add_epi32(vsse, _mm_madd_epi16(diff0, diff0));
    vsse = _mm_add_epi32(vsse, _mm_madd_epi16(diff1, diff1));
  }

  if ( sum ) {
    // sum
    vsum = _mm_add_epi16(vsum, _mm_srli_si128(vsum, 8));
    vsum = _mm_add_epi16(vsum, _mm_srli_si128(vsum, 4));
    vsum = _mm_add_epi16(vsum, _mm_srli_si128(vsum, 2));
    *sum = (int16_t)_mm_extract_epi16(vsum, 0);
  }

  // sse
  vsse = _mm_add_epi32(vsse, _mm_srli_si128(vsse, 8));
  vsse = _mm_add_epi32(vsse, _mm_srli_si128(vsse, 4));
  *sse = _mm_cvtsi128_si32(vsse);
}

void vpx_get16x16var_sse2(const uint8_t *src, int src_stride,
                          const uint8_t *ref, int ref_stride, unsigned int *sse,
                          int *sum) {
  const __m128i zero = _mm_setzero_si128();
  __m128i vsum = _mm_setzero_si128();
  __m128i vsse = _mm_setzero_si128();
  int i;

  for (i = 0; i < 16; ++i) {
    const __m128i s = _mm_loadu_si128((const __m128i *)src);
    const __m128i r = _mm_loadu_si128((const __m128i *)ref);

    const __m128i src0 = _mm_unpacklo_epi8(s, zero);
    const __m128i ref0 = _mm_unpacklo_epi8(r, zero);
    const __m128i diff0 = _mm_sub_epi16(src0, ref0);

    const __m128i src1 = _mm_unpackhi_epi8(s, zero);
    const __m128i ref1 = _mm_unpackhi_epi8(r, zero);
    const __m128i diff1 = _mm_sub_epi16(src1, ref1);

    vsum = _mm_add_epi16(vsum, diff0);
    vsum = _mm_add_epi16(vsum, diff1);
    vsse = _mm_add_epi32(vsse, _mm_madd_epi16(diff0, diff0));
    vsse = _mm_add_epi32(vsse, _mm_madd_epi16(diff1, diff1));

    src += src_stride;
    ref += ref_stride;
  }

  if ( sum ) {
    // sum
    vsum = _mm_add_epi16(vsum, _mm_srli_si128(vsum, 8));
    vsum = _mm_add_epi16(vsum, _mm_srli_si128(vsum, 4));
    *sum =
        (int16_t)_mm_extract_epi16(vsum, 0) + (int16_t)_mm_extract_epi16(vsum, 1);
  }

  // sse
  vsse = _mm_add_epi32(vsse, _mm_srli_si128(vsse, 8));
  vsse = _mm_add_epi32(vsse, _mm_srli_si128(vsse, 4));
  *sse = _mm_cvtsi128_si32(vsse);
}

static void variance_sse2(const unsigned char *src, int src_stride,
                          const unsigned char *ref, int ref_stride, int w,
                          int h, unsigned int *sse, int *sum,
                          getNxMvar_fn_t var_fn, int block_size) {
  int i, j;

  *sse = 0;
  *sum = 0;

  for (i = 0; i < h; i += block_size) {
    for (j = 0; j < w; j += block_size) {
      unsigned int sse0;
      int sum0;
      var_fn(src + src_stride * i + j, src_stride, ref + ref_stride * i + j,
             ref_stride, &sse0, &sum0);
      *sse += sse0;
      *sum += sum0;
    }
  }
}

unsigned int vpx_variance4x4_sse2(const unsigned char *src, int src_stride,
                                  const unsigned char *ref, int ref_stride,
                                  unsigned int *sse) {
  int sum;
  get4x4var_sse2(src, src_stride, ref, ref_stride, sse, &sum);
  return *sse - ((sum * sum) >> 4);
}

unsigned int vpx_variance8x4_sse2(const uint8_t *src, int src_stride,
                                  const uint8_t *ref, int ref_stride,
                                  unsigned int *sse) {
  int sum;
  variance_sse2(src, src_stride, ref, ref_stride, 8, 4, sse, &sum,
                get4x4var_sse2, 4);
  return *sse - ((sum * sum) >> 5);
}

unsigned int vpx_variance4x8_sse2(const uint8_t *src, int src_stride,
                                  const uint8_t *ref, int ref_stride,
                                  unsigned int *sse) {
  int sum;
  variance_sse2(src, src_stride, ref, ref_stride, 4, 8, sse, &sum,
                get4x4var_sse2, 4);
  return *sse - ((sum * sum) >> 5);
}

unsigned int vpx_variance8x8_sse2(const unsigned char *src, int src_stride,
                                  const unsigned char *ref, int ref_stride,
                                  unsigned int *sse) {
  int sum;
  vpx_get8x8var_sse2(src, src_stride, ref, ref_stride, sse, &sum);
  return *sse - ((sum * sum) >> 6);
}

unsigned int vpx_variance16x8_sse2(const unsigned char *src, int src_stride,
                                   const unsigned char *ref, int ref_stride,
                                   unsigned int *sse) {
  int sum;
  variance_sse2(src, src_stride, ref, ref_stride, 16, 8, sse, &sum,
                vpx_get8x8var_sse2, 8);
  return *sse - ((sum * sum) >> 7);
}

unsigned int vpx_variance8x16_sse2(const unsigned char *src, int src_stride,
                                   const unsigned char *ref, int ref_stride,
                                   unsigned int *sse) {
  int sum;
  variance_sse2(src, src_stride, ref, ref_stride, 8, 16, sse, &sum,
                vpx_get8x8var_sse2, 8);
  return *sse - ((sum * sum) >> 7);
}

unsigned int vpx_variance16x16_sse2(const unsigned char *src, int src_stride,
                                    const unsigned char *ref, int ref_stride,
                                    unsigned int *sse) {
  int sum;
  vpx_get16x16var_sse2(src, src_stride, ref, ref_stride, sse, &sum);
  return *sse - (((uint32_t)((int64_t)sum * sum)) >> 8);
}

unsigned int vpx_variance32x32_sse2(const uint8_t *src, int src_stride,
                                    const uint8_t *ref, int ref_stride,
                                    unsigned int *sse) {
  int sum;
  variance_sse2(src, src_stride, ref, ref_stride, 32, 32, sse, &sum,
                vpx_get16x16var_sse2, 16);
  return *sse - (unsigned int)(((int64_t)sum * sum) >> 10);
}

unsigned int vpx_variance32x16_sse2(const uint8_t *src, int src_stride,
                                    const uint8_t *ref, int ref_stride,
                                    unsigned int *sse) {
  int sum;
  variance_sse2(src, src_stride, ref, ref_stride, 32, 16, sse, &sum,
                vpx_get16x16var_sse2, 16);
  return *sse - (unsigned int)(((int64_t)sum * sum) >> 9);
}

unsigned int vpx_variance16x32_sse2(const uint8_t *src, int src_stride,
                                    const uint8_t *ref, int ref_stride,
                                    unsigned int *sse) {
  int sum;
  variance_sse2(src, src_stride, ref, ref_stride, 16, 32, sse, &sum,
                vpx_get16x16var_sse2, 16);
  return *sse - (unsigned int)(((int64_t)sum * sum) >> 9);
}

unsigned int vpx_variance64x64_sse2(const uint8_t *src, int src_stride,
                                    const uint8_t *ref, int ref_stride,
                                    unsigned int *sse) {
  int sum;
  variance_sse2(src, src_stride, ref, ref_stride, 64, 64, sse, &sum,
                vpx_get16x16var_sse2, 16);
  return *sse - (unsigned int)(((int64_t)sum * sum) >> 12);
}

unsigned int vpx_variance64x32_sse2(const uint8_t *src, int src_stride,
                                    const uint8_t *ref, int ref_stride,
                                    unsigned int *sse) {
  int sum;
  variance_sse2(src, src_stride, ref, ref_stride, 64, 32, sse, &sum,
                vpx_get16x16var_sse2, 16);
  return *sse - (unsigned int)(((int64_t)sum * sum) >> 11);
}

unsigned int vpx_variance32x64_sse2(const uint8_t *src, int src_stride,
                                    const uint8_t *ref, int ref_stride,
                                    unsigned int *sse) {
  int sum;
  variance_sse2(src, src_stride, ref, ref_stride, 32, 64, sse, &sum,
                vpx_get16x16var_sse2, 16);
  return *sse - (unsigned int)(((int64_t)sum * sum) >> 11);
}

unsigned int vpx_mse8x8_sse2(const uint8_t *src, int src_stride,
                             const uint8_t *ref, int ref_stride,
                             unsigned int *sse) {
  vpx_variance8x8_sse2(src, src_stride, ref, ref_stride, sse);
  return *sse;
}

unsigned int vpx_mse8x16_sse2(const uint8_t *src, int src_stride,
                              const uint8_t *ref, int ref_stride,
                              unsigned int *sse) {
  vpx_variance8x16_sse2(src, src_stride, ref, ref_stride, sse);
  return *sse;
}

unsigned int vpx_mse16x8_sse2(const uint8_t *src, int src_stride,
                              const uint8_t *ref, int ref_stride,
                              unsigned int *sse) {
  vpx_variance16x8_sse2(src, src_stride, ref, ref_stride, sse);
  return *sse;
}

unsigned int vpx_mse16x16_sse2(const uint8_t *src, int src_stride,
                               const uint8_t *ref, int ref_stride,
                               unsigned int *sse) {
  vpx_variance16x16_sse2(src, src_stride, ref, ref_stride, sse);
  return *sse;
}
