<commit_before>/*
 *  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 "./vpx_config.h"

#include "vp9/encoder/vp9_variance.h"
#include "vpx_ports/mem.h"

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

unsigned int vp9_get4x4var_mmx(const unsigned char *src, int src_stride,
                               const unsigned char *ref, int ref_stride,
                               unsigned int *sse, int *sum);


unsigned int vp9_get8x8var_sse2(const unsigned char *src, int src_stride,
                                const unsigned char *ref, int ref_stride,
                                unsigned int *sse, int *sum);

unsigned int vp9_get16x16var_sse2(const unsigned char *src, int src_stride,
                                  const unsigned char *ref, int ref_stride,
                                  unsigned int *sse, int *sum);

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,
                          variance_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 vp9_variance4x4_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, 4, 4,
                sse, &sum, vp9_get4x4var_mmx, 4);
  return *sse - (((unsigned int)sum * sum) >> 4);
}

unsigned int vp9_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, vp9_get4x4var_mmx, 4);
  return *sse - (((unsigned int)sum * sum) >> 5);
}

unsigned int vp9_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, vp9_get4x4var_mmx, 4);
  return *sse - (((unsigned int)sum * sum) >> 5);
}
<commit_msg>Implementing 4x4 variance calculation with SSE2.<commit_after>/*
 *  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 "./vpx_config.h"

#include "vp9/encoder/vp9_variance.h"
#include "vpx_ports/mem.h"

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

#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)))

unsigned int vp9_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);

  // 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
  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);

  return 0;
}

unsigned int vp9_get8x8var_sse2(const unsigned char *src, int src_stride,
                                const unsigned char *ref, int ref_stride,
                                unsigned int *sse, int *sum);

unsigned int vp9_get16x16var_sse2(const unsigned char *src, int src_stride,
                                  const unsigned char *ref, int ref_stride,
                                  unsigned int *sse, int *sum);

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,
                          variance_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 vp9_variance4x4_sse2(const unsigned char *src, int src_stride,
                                  const unsigned char *ref, int ref_stride,
                                  unsigned int *sse) {
  int sum;
  vp9_get4x4var_sse2(src, src_stride, ref, ref_stride, sse, &sum);
  return *sse - (((unsigned int)sum * sum) >> 4);
}

unsigned int vp9_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, vp9_get4x4var_sse2, 4);
  return *sse - (((unsigned int)sum * sum) >> 5);
}

unsigned int vp9_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, vp9_get4x4var_sse2, 4);
  return *sse - (((unsigned int)sum * sum) >> 5);
}

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