/*
 *  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 "vp9/common/vp9_pragmas.h"
#include "vpx_ports/mem.h"

#define HALFNDX 8

extern void filter_block1d_h6_mmx(const unsigned char *src_ptr, unsigned short *output_ptr, unsigned int src_pixels_per_line, unsigned int pixel_step, unsigned int output_height, unsigned int output_width, short *vp7_filter);
extern void filter_block1d_v6_mmx(const short *src_ptr, unsigned char *output_ptr, unsigned int pixels_per_line, unsigned int pixel_step, unsigned int output_height, unsigned int output_width, short *vp7_filter);
extern void filter_block1d8_h6_sse2(const unsigned char *src_ptr, unsigned short *output_ptr, unsigned int src_pixels_per_line, unsigned int pixel_step, unsigned int output_height, unsigned int output_width, short *vp7_filter);
extern void filter_block1d8_v6_sse2(const short *src_ptr, unsigned char *output_ptr, unsigned int pixels_per_line, unsigned int pixel_step, unsigned int output_height, unsigned int output_width, short *vp7_filter);

extern void vp9_filter_block2d_bil4x4_var_mmx
(
  const unsigned char *ref_ptr,
  int ref_pixels_per_line,
  const unsigned char *src_ptr,
  int src_pixels_per_line,
  const short *HFilter,
  const short *VFilter,
  int *sum,
  unsigned int *sumsquared
);

extern unsigned int vp9_get4x4var_mmx
(
  const unsigned char *src_ptr,
  int  source_stride,
  const unsigned char *ref_ptr,
  int  recon_stride,
  unsigned int *SSE,
  int *Sum
);

unsigned int vp9_get_mb_ss_sse2
(
  const short *src_ptr
);
unsigned int vp9_get16x16var_sse2
(
  const unsigned char *src_ptr,
  int source_stride,
  const unsigned char *ref_ptr,
  int recon_stride,
  unsigned int *SSE,
  int *Sum
);
unsigned int vp9_get8x8var_sse2
(
  const unsigned char *src_ptr,
  int source_stride,
  const unsigned char *ref_ptr,
  int recon_stride,
  unsigned int *SSE,
  int *Sum
);
void vp9_filter_block2d_bil_var_sse2
(
  const unsigned char *ref_ptr,
  int ref_pixels_per_line,
  const unsigned char *src_ptr,
  int src_pixels_per_line,
  unsigned int Height,
  int  xoffset,
  int  yoffset,
  int *sum,
  unsigned int *sumsquared
);
void vp9_half_horiz_vert_variance8x_h_sse2
(
  const unsigned char *ref_ptr,
  int ref_pixels_per_line,
  const unsigned char *src_ptr,
  int src_pixels_per_line,
  unsigned int Height,
  int *sum,
  unsigned int *sumsquared
);
void vp9_half_horiz_vert_variance16x_h_sse2
(
  const unsigned char *ref_ptr,
  int ref_pixels_per_line,
  const unsigned char *src_ptr,
  int src_pixels_per_line,
  unsigned int Height,
  int *sum,
  unsigned int *sumsquared
);
void vp9_half_horiz_variance8x_h_sse2
(
  const unsigned char *ref_ptr,
  int ref_pixels_per_line,
  const unsigned char *src_ptr,
  int src_pixels_per_line,
  unsigned int Height,
  int *sum,
  unsigned int *sumsquared
);
void vp9_half_horiz_variance16x_h_sse2
(
  const unsigned char *ref_ptr,
  int ref_pixels_per_line,
  const unsigned char *src_ptr,
  int src_pixels_per_line,
  unsigned int Height,
  int *sum,
  unsigned int *sumsquared
);
void vp9_half_vert_variance8x_h_sse2
(
  const unsigned char *ref_ptr,
  int ref_pixels_per_line,
  const unsigned char *src_ptr,
  int src_pixels_per_line,
  unsigned int Height,
  int *sum,
  unsigned int *sumsquared
);
void vp9_half_vert_variance16x_h_sse2
(
  const unsigned char *ref_ptr,
  int ref_pixels_per_line,
  const unsigned char *src_ptr,
  int src_pixels_per_line,
  unsigned int Height,
  int *sum,
  unsigned int *sumsquared
);

DECLARE_ALIGNED(16, extern const short, vp9_bilinear_filters_mmx[16][8]);

typedef unsigned int (*get_var_sse2) (
  const unsigned char *src_ptr,
  int source_stride,
  const unsigned char *ref_ptr,
  int recon_stride,
  unsigned int *SSE,
  int *Sum
);

static void variance_sse2(const unsigned char *src_ptr, int  source_stride,
                        const unsigned char *ref_ptr, int  recon_stride,
                        int  w, int  h, unsigned int *sse, int *sum,
                        get_var_sse2 var_fn, int block_size) {
  unsigned int sse0;
  int sum0;
  int i, j;

  *sse = 0;
  *sum = 0;

  for (i = 0; i < h; i += block_size) {
    for (j = 0; j < w; j += block_size) {
      var_fn(src_ptr + source_stride * i + j, source_stride,
             ref_ptr + recon_stride * i + j, recon_stride, &sse0, &sum0);
      *sse += sse0;
      *sum += sum0;
    }
  }
}

unsigned int vp9_variance4x4_sse2(
  const unsigned char *src_ptr,
  int  source_stride,
  const unsigned char *ref_ptr,
  int  recon_stride,
  unsigned int *sse) {
  unsigned int var;
  int avg;

  variance_sse2(src_ptr, source_stride, ref_ptr, recon_stride, 4, 4,
                  &var, &avg, vp9_get4x4var_mmx, 4);
  *sse = var;
  return (var - (((unsigned int)avg * avg) >> 4));
}

unsigned int vp9_variance8x4_sse2(const uint8_t *src_ptr,
                                  int  source_stride,
                                  const uint8_t *ref_ptr,
                                  int  recon_stride,
                                  unsigned int *sse) {
  unsigned int var;
  int avg;

  variance_sse2(src_ptr, source_stride, ref_ptr, recon_stride, 8, 4,
                  &var, &avg, vp9_get4x4var_mmx, 4);
  *sse = var;
  return (var - (((unsigned int)avg * avg) >> 5));
}

unsigned int vp9_variance4x8_sse2(const uint8_t *src_ptr,
                                  int  source_stride,
                                  const uint8_t *ref_ptr,
                                  int  recon_stride,
                                  unsigned int *sse) {
  unsigned int var;
  int avg;

  variance_sse2(src_ptr, source_stride, ref_ptr, recon_stride, 4, 8,
                  &var, &avg, vp9_get4x4var_mmx, 4);
  *sse = var;
  return (var - (((unsigned int)avg * avg) >> 5));
}

unsigned int vp9_variance8x8_sse2
(
  const unsigned char *src_ptr,
  int  source_stride,
  const unsigned char *ref_ptr,
  int  recon_stride,
  unsigned int *sse) {
  unsigned int var;
  int avg;

  variance_sse2(src_ptr, source_stride, ref_ptr, recon_stride, 8, 8,
                  &var, &avg, vp9_get8x8var_sse2, 8);
  *sse = var;
  return (var - (((unsigned int)avg * avg) >> 6));
}

unsigned int vp9_variance16x8_sse2
(
  const unsigned char *src_ptr,
  int  source_stride,
  const unsigned char *ref_ptr,
  int  recon_stride,
  unsigned int *sse) {
  unsigned int var;
  int avg;

  variance_sse2(src_ptr, source_stride, ref_ptr, recon_stride, 16, 8,
                  &var, &avg, vp9_get8x8var_sse2, 8);
  *sse = var;
  return (var - (((unsigned int)avg * avg) >> 7));
}

unsigned int vp9_variance8x16_sse2
(
  const unsigned char *src_ptr,
  int  source_stride,
  const unsigned char *ref_ptr,
  int  recon_stride,
  unsigned int *sse) {
  unsigned int var;
  int avg;

  variance_sse2(src_ptr, source_stride, ref_ptr, recon_stride, 8, 16,
                &var, &avg, vp9_get8x8var_sse2, 8);
  *sse = var;
  return (var - (((unsigned int)avg * avg) >> 7));
}

unsigned int vp9_variance16x16_sse2
(
  const unsigned char *src_ptr,
  int  source_stride,
  const unsigned char *ref_ptr,
  int  recon_stride,
  unsigned int *sse) {
  unsigned int var;
  int avg;

  variance_sse2(src_ptr, source_stride, ref_ptr, recon_stride, 16, 16,
                &var, &avg, vp9_get16x16var_sse2, 16);
  *sse = var;
  return (var - (((unsigned int)avg * avg) >> 8));
}

unsigned int vp9_mse16x16_wmt(
  const unsigned char *src_ptr,
  int  source_stride,
  const unsigned char *ref_ptr,
  int  recon_stride,
  unsigned int *sse) {

  unsigned int sse0;
  int sum0;
  vp9_get16x16var_sse2(src_ptr, source_stride, ref_ptr, recon_stride, &sse0,
                       &sum0);
  *sse = sse0;
  return sse0;
}

unsigned int vp9_variance32x32_sse2(const uint8_t *src_ptr,
                                    int  source_stride,
                                    const uint8_t *ref_ptr,
                                    int  recon_stride,
                                    unsigned int *sse) {
  unsigned int var;
  int avg;

  variance_sse2(src_ptr, source_stride, ref_ptr, recon_stride, 32, 32,
                &var, &avg, vp9_get16x16var_sse2, 16);
  *sse = var;
  return (var - (((int64_t)avg * avg) >> 10));
}

unsigned int vp9_variance32x16_sse2(const uint8_t *src_ptr,
                                    int  source_stride,
                                    const uint8_t *ref_ptr,
                                    int  recon_stride,
                                    unsigned int *sse) {
  unsigned int var;
  int avg;

  variance_sse2(src_ptr, source_stride, ref_ptr, recon_stride, 32, 16,
                &var, &avg, vp9_get16x16var_sse2, 16);
  *sse = var;
  return (var - (((int64_t)avg * avg) >> 9));
}

unsigned int vp9_variance16x32_sse2(const uint8_t *src_ptr,
                                    int  source_stride,
                                    const uint8_t *ref_ptr,
                                    int  recon_stride,
                                    unsigned int *sse) {
  unsigned int var;
  int avg;

  variance_sse2(src_ptr, source_stride, ref_ptr, recon_stride, 16, 32,
                &var, &avg, vp9_get16x16var_sse2, 16);
  *sse = var;
  return (var - (((int64_t)avg * avg) >> 9));
}

unsigned int vp9_variance64x64_sse2(const uint8_t *src_ptr,
                                    int  source_stride,
                                    const uint8_t *ref_ptr,
                                    int  recon_stride,
                                    unsigned int *sse) {
  unsigned int var;
  int avg;

  variance_sse2(src_ptr, source_stride, ref_ptr, recon_stride, 64, 64,
                &var, &avg, vp9_get16x16var_sse2, 16);
  *sse = var;
  return (var - (((int64_t)avg * avg) >> 12));
}

unsigned int vp9_variance64x32_sse2(const uint8_t *src_ptr,
                                    int  source_stride,
                                    const uint8_t *ref_ptr,
                                    int  recon_stride,
                                    unsigned int *sse) {
  unsigned int var;
  int avg;

  variance_sse2(src_ptr, source_stride, ref_ptr, recon_stride, 64, 32,
                &var, &avg, vp9_get16x16var_sse2, 16);
  *sse = var;
  return (var - (((int64_t)avg * avg) >> 11));
}

unsigned int vp9_variance32x64_sse2(const uint8_t *src_ptr,
                                    int  source_stride,
                                    const uint8_t *ref_ptr,
                                    int  recon_stride,
                                    unsigned int *sse) {
  unsigned int var;
  int avg;

  variance_sse2(src_ptr, source_stride, ref_ptr, recon_stride, 32, 64,
                &var, &avg, vp9_get16x16var_sse2, 16);
  *sse = var;
  return (var - (((int64_t)avg * avg) >> 11));
}

unsigned int vp9_sub_pixel_variance4x4_wmt
(
  const unsigned char  *src_ptr,
  int  src_pixels_per_line,
  int  xoffset,
  int  yoffset,
  const unsigned char *dst_ptr,
  int dst_pixels_per_line,
  unsigned int *sse
) {
  int xsum;
  unsigned int xxsum;
  vp9_filter_block2d_bil4x4_var_mmx(
    src_ptr, src_pixels_per_line,
    dst_ptr, dst_pixels_per_line,
    vp9_bilinear_filters_mmx[xoffset], vp9_bilinear_filters_mmx[yoffset],
    &xsum, &xxsum
  );
  *sse = xxsum;
  return (xxsum - (((unsigned int)xsum * xsum) >> 4));
}


unsigned int vp9_sub_pixel_variance8x8_wmt
(
  const unsigned char  *src_ptr,
  int  src_pixels_per_line,
  int  xoffset,
  int  yoffset,
  const unsigned char *dst_ptr,
  int dst_pixels_per_line,
  unsigned int *sse
) {
  int xsum;
  unsigned int xxsum;

  if (xoffset == HALFNDX && yoffset == 0) {
    vp9_half_horiz_variance8x_h_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 8,
      &xsum, &xxsum);
  } else if (xoffset == 0 && yoffset == HALFNDX) {
    vp9_half_vert_variance8x_h_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 8,
      &xsum, &xxsum);
  } else if (xoffset == HALFNDX && yoffset == HALFNDX) {
    vp9_half_horiz_vert_variance8x_h_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 8,
      &xsum, &xxsum);
  } else {
    vp9_filter_block2d_bil_var_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 8,
      xoffset, yoffset,
      &xsum, &xxsum);
  }

  *sse = xxsum;
  return (xxsum - (((unsigned int)xsum * xsum) >> 6));
}

static void sub_pixel_variance16x16_sse2(const uint8_t *src_ptr,
                                         int src_pixels_per_line,
                                         int xoffset,
                                         int yoffset,
                                         const uint8_t *dst_ptr,
                                         int dst_pixels_per_line,
                                         unsigned int *sse, int *avg) {
  int xsum0, xsum1;
  unsigned int xxsum0, xxsum1;

  // note we could avoid these if statements if the calling function
  // just called the appropriate functions inside.
  if (xoffset == HALFNDX && yoffset == 0) {
    vp9_half_horiz_variance16x_h_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 16,
      &xsum0, &xxsum0);
  } else if (xoffset == 0 && yoffset == HALFNDX) {
    vp9_half_vert_variance16x_h_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 16,
      &xsum0, &xxsum0);
  } else if (xoffset == HALFNDX && yoffset == HALFNDX) {
    vp9_half_horiz_vert_variance16x_h_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 16,
      &xsum0, &xxsum0);
  } else {
    vp9_filter_block2d_bil_var_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 16,
      xoffset, yoffset,
      &xsum0, &xxsum0
    );

    vp9_filter_block2d_bil_var_sse2(
      src_ptr + 8, src_pixels_per_line,
      dst_ptr + 8, dst_pixels_per_line, 16,
      xoffset, yoffset,
      &xsum1, &xxsum1
    );
    xsum0 += xsum1;
    xxsum0 += xxsum1;
  }

  *sse = xxsum0;
  *avg = xsum0;
}

unsigned int vp9_sub_pixel_variance16x16_sse2(const uint8_t *src_ptr,
                                              int src_pixels_per_line,
                                              int xoffset,
                                              int yoffset,
                                              const uint8_t *dst_ptr,
                                              int dst_pixels_per_line,
                                              unsigned int *sse_ptr) {
  int avg;
  unsigned int sse;

  sub_pixel_variance16x16_sse2(src_ptr, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr, dst_pixels_per_line,
                               &sse, &avg);
  *sse_ptr = sse;

  return (sse - (((unsigned int) avg * avg) >> 8));
}

unsigned int vp9_sub_pixel_variance32x32_sse2(const uint8_t *src_ptr,
                                              int src_pixels_per_line,
                                              int xoffset,
                                              int yoffset,
                                              const uint8_t *dst_ptr,
                                              int dst_pixels_per_line,
                                              unsigned int *sse_ptr) {
  int avg0, avg1, avg2, avg3;
  unsigned int sse0, sse1, sse2, sse3;

  sub_pixel_variance16x16_sse2(src_ptr, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr, dst_pixels_per_line,
                               &sse0, &avg0);
  sub_pixel_variance16x16_sse2(src_ptr + 16, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr + 16, dst_pixels_per_line,
                               &sse1, &avg1);
  src_ptr += 16 * src_pixels_per_line;
  dst_ptr += 16 * dst_pixels_per_line;
  sub_pixel_variance16x16_sse2(src_ptr, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr, dst_pixels_per_line,
                               &sse2, &avg2);
  sub_pixel_variance16x16_sse2(src_ptr + 16, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr + 16, dst_pixels_per_line,
                               &sse3, &avg3);
  sse0 += sse1 + sse2 + sse3;
  avg0 += avg1 + avg2 + avg3;
  *sse_ptr = sse0;

  return (sse0 - (((unsigned int) avg0 * avg0) >> 10));
}

unsigned int vp9_sub_pixel_variance64x64_sse2(const uint8_t *src_ptr,
                                              int src_pixels_per_line,
                                              int xoffset,
                                              int yoffset,
                                              const uint8_t *dst_ptr,
                                              int dst_pixels_per_line,
                                              unsigned int *sse_ptr) {
  int avg0, avg1, avg2, avg3, avg4;
  unsigned int sse0, sse1, sse2, sse3, sse4;

  sub_pixel_variance16x16_sse2(src_ptr, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr, dst_pixels_per_line,
                               &sse0, &avg0);
  sub_pixel_variance16x16_sse2(src_ptr + 16, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr + 16, dst_pixels_per_line,
                               &sse1, &avg1);
  sub_pixel_variance16x16_sse2(src_ptr + 32, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr + 32, dst_pixels_per_line,
                               &sse2, &avg2);
  sub_pixel_variance16x16_sse2(src_ptr + 48, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr + 48, dst_pixels_per_line,
                               &sse3, &avg3);
  src_ptr += 16 * src_pixels_per_line;
  dst_ptr += 16 * dst_pixels_per_line;
  avg0 += avg1 + avg2 + avg3;
  sse0 += sse1 + sse2 + sse3;
  sub_pixel_variance16x16_sse2(src_ptr, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr, dst_pixels_per_line,
                               &sse1, &avg1);
  sub_pixel_variance16x16_sse2(src_ptr + 16, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr + 16, dst_pixels_per_line,
                               &sse2, &avg2);
  sub_pixel_variance16x16_sse2(src_ptr + 32, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr + 32, dst_pixels_per_line,
                               &sse3, &avg3);
  sub_pixel_variance16x16_sse2(src_ptr + 48, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr + 48, dst_pixels_per_line,
                               &sse4, &avg4);
  src_ptr += 16 * src_pixels_per_line;
  dst_ptr += 16 * dst_pixels_per_line;
  avg0 += avg1 + avg2 + avg3 + avg4;
  sse0 += sse1 + sse2 + sse3 + sse4;
  sub_pixel_variance16x16_sse2(src_ptr, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr, dst_pixels_per_line,
                               &sse1, &avg1);
  sub_pixel_variance16x16_sse2(src_ptr + 16, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr + 16, dst_pixels_per_line,
                               &sse2, &avg2);
  sub_pixel_variance16x16_sse2(src_ptr + 32, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr + 32, dst_pixels_per_line,
                               &sse3, &avg3);
  sub_pixel_variance16x16_sse2(src_ptr + 48, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr + 48, dst_pixels_per_line,
                               &sse4, &avg4);
  src_ptr += 16 * src_pixels_per_line;
  dst_ptr += 16 * dst_pixels_per_line;
  avg0 += avg1 + avg2 + avg3 + avg4;
  sse0 += sse1 + sse2 + sse3 + sse4;
  sub_pixel_variance16x16_sse2(src_ptr, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr, dst_pixels_per_line,
                               &sse1, &avg1);
  sub_pixel_variance16x16_sse2(src_ptr + 16, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr + 16, dst_pixels_per_line,
                               &sse2, &avg2);
  sub_pixel_variance16x16_sse2(src_ptr + 32, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr + 32, dst_pixels_per_line,
                               &sse3, &avg3);
  sub_pixel_variance16x16_sse2(src_ptr + 48, src_pixels_per_line, xoffset,
                               yoffset, dst_ptr + 48, dst_pixels_per_line,
                               &sse4, &avg4);
  avg0 += avg1 + avg2 + avg3 + avg4;
  sse0 += sse1 + sse2 + sse3 + sse4;
  *sse_ptr = sse0;

  return (sse0 - (((unsigned int) avg0 * avg0) >> 12));
}

unsigned int vp9_sub_pixel_mse16x16_sse2(
  const unsigned char  *src_ptr,
  int  src_pixels_per_line,
  int  xoffset,
  int  yoffset,
  const unsigned char *dst_ptr,
  int dst_pixels_per_line,
  unsigned int *sse
) {
  vp9_sub_pixel_variance16x16_sse2(src_ptr, src_pixels_per_line, xoffset,
                                   yoffset, dst_ptr, dst_pixels_per_line, sse);
  return *sse;
}

unsigned int vp9_sub_pixel_variance16x8_wmt
(
  const unsigned char  *src_ptr,
  int  src_pixels_per_line,
  int  xoffset,
  int  yoffset,
  const unsigned char *dst_ptr,
  int dst_pixels_per_line,
  unsigned int *sse

) {
  int xsum0, xsum1;
  unsigned int xxsum0, xxsum1;

  if (xoffset == HALFNDX && yoffset == 0) {
    vp9_half_horiz_variance16x_h_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 8,
      &xsum0, &xxsum0);
  } else if (xoffset == 0 && yoffset == HALFNDX) {
    vp9_half_vert_variance16x_h_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 8,
      &xsum0, &xxsum0);
  } else if (xoffset == HALFNDX && yoffset == HALFNDX) {
    vp9_half_horiz_vert_variance16x_h_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 8,
      &xsum0, &xxsum0);
  } else {
    vp9_filter_block2d_bil_var_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 8,
      xoffset, yoffset,
      &xsum0, &xxsum0);

    vp9_filter_block2d_bil_var_sse2(
      src_ptr + 8, src_pixels_per_line,
      dst_ptr + 8, dst_pixels_per_line, 8,
      xoffset, yoffset,
      &xsum1, &xxsum1);
    xsum0 += xsum1;
    xxsum0 += xxsum1;
  }

  *sse = xxsum0;
  return (xxsum0 - (((unsigned int)xsum0 * xsum0) >> 7));
}

unsigned int vp9_sub_pixel_variance8x16_wmt
(
  const unsigned char  *src_ptr,
  int  src_pixels_per_line,
  int  xoffset,
  int  yoffset,
  const unsigned char *dst_ptr,
  int dst_pixels_per_line,
  unsigned int *sse
) {
  int xsum;
  unsigned int xxsum;

  if (xoffset == HALFNDX && yoffset == 0) {
    vp9_half_horiz_variance8x_h_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 16,
      &xsum, &xxsum);
  } else if (xoffset == 0 && yoffset == HALFNDX) {
    vp9_half_vert_variance8x_h_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 16,
      &xsum, &xxsum);
  } else if (xoffset == HALFNDX && yoffset == HALFNDX) {
    vp9_half_horiz_vert_variance8x_h_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 16,
      &xsum, &xxsum);
  } else {
    vp9_filter_block2d_bil_var_sse2(
      src_ptr, src_pixels_per_line,
      dst_ptr, dst_pixels_per_line, 16,
      xoffset, yoffset,
      &xsum, &xxsum);
  }

  *sse = xxsum;
  return (xxsum - (((unsigned int)xsum * xsum) >> 7));
}


unsigned int vp9_variance_halfpixvar16x16_h_wmt(
  const unsigned char *src_ptr,
  int  src_pixels_per_line,
  const unsigned char *dst_ptr,
  int  dst_pixels_per_line,
  unsigned int *sse) {
  int xsum0;
  unsigned int xxsum0;

  vp9_half_horiz_variance16x_h_sse2(
    src_ptr, src_pixels_per_line,
    dst_ptr, dst_pixels_per_line, 16,
    &xsum0, &xxsum0);

  *sse = xxsum0;
  return (xxsum0 - (((unsigned int)xsum0 * xsum0) >> 8));
}


unsigned int vp9_variance_halfpixvar16x16_v_wmt(
  const unsigned char *src_ptr,
  int  src_pixels_per_line,
  const unsigned char *dst_ptr,
  int  dst_pixels_per_line,
  unsigned int *sse) {
  int xsum0;
  unsigned int xxsum0;
  vp9_half_vert_variance16x_h_sse2(
    src_ptr, src_pixels_per_line,
    dst_ptr, dst_pixels_per_line, 16,
    &xsum0, &xxsum0);

  *sse = xxsum0;
  return (xxsum0 - (((unsigned int)xsum0 * xsum0) >> 8));
}


unsigned int vp9_variance_halfpixvar16x16_hv_wmt(
  const unsigned char *src_ptr,
  int  src_pixels_per_line,
  const unsigned char *dst_ptr,
  int  dst_pixels_per_line,
  unsigned int *sse) {
  int xsum0;
  unsigned int xxsum0;

  vp9_half_horiz_vert_variance16x_h_sse2(
    src_ptr, src_pixels_per_line,
    dst_ptr, dst_pixels_per_line, 16,
    &xsum0, &xxsum0);

  *sse = xxsum0;
  return (xxsum0 - (((unsigned int)xsum0 * xsum0) >> 8));
}