text: /*
   *  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 "./vpx_dsp_rtcd.h"
  
  #include "vpx_ports/mem.h"
  #include "vpx/vpx_integer.h"
  
  #include "vpx_dsp/variance.h"
  
  static const uint8_t bilinear_filters[8][2] = {
    { 128, 0 }, { 112, 16 }, { 96, 32 }, { 80, 48 },
    { 64, 64 }, { 48, 80 },  { 32, 96 }, { 16, 112 },
  };
  
  uint32_t vpx_get4x4sse_cs_c(const uint8_t *a, int a_stride, const uint8_t *b,
                              int b_stride) {
    int distortion = 0;
    int r, c;
  
    for (r = 0; r < 4; ++r) {
      for (c = 0; c < 4; ++c) {
        int diff = a[c] - b[c];
        distortion += diff * diff;
      }
  
      a += a_stride;
      b += b_stride;
    }
  
    return distortion;
  }
  
  uint32_t vpx_get_mb_ss_c(const int16_t *a) {
    unsigned int i, sum = 0;
  
    for (i = 0; i < 256; ++i) {
      sum += a[i] * a[i];
    }
  
    return sum;
  }
  
  static void variance(const uint8_t *a, int a_stride, const uint8_t *b,
                       int b_stride, int w, int h, uint32_t *sse, int *sum) {
    int i, j;
  
    *sum = 0;
    *sse = 0;
  
    for (i = 0; i < h; ++i) {
      for (j = 0; j < w; ++j) {
        const int diff = a[j] - b[j];
        *sum += diff;
        *sse += diff * diff;
      }
  
      a += a_stride;
      b += b_stride;
    }
  }
  
  // Applies a 1-D 2-tap bilinear filter to the source block in either horizontal
  // or vertical direction to produce the filtered output block. Used to implement
  // the first-pass of 2-D separable filter.
  //
  // Produces int16_t output to retain precision for the next pass. Two filter
  // taps should sum to FILTER_WEIGHT. pixel_step defines whether the filter is
  // applied horizontally (pixel_step = 1) or vertically (pixel_step = stride).
  // It defines the offset required to move from one input to the next.
  static void var_filter_block2d_bil_first_pass(const uint8_t *a, uint16_t *b,
                                                unsigned int src_pixels_per_line,
                                                int pixel_step,
                                                unsigned int output_height,
                                                unsigned int output_width,
                                                const uint8_t *filter) {
    unsigned int i, j;
  
    for (i = 0; i < output_height; ++i) {
      for (j = 0; j < output_width; ++j) {
        b[j] = ROUND_POWER_OF_TWO(
            (int)a[0] * filter[0] + (int)a[pixel_step] * filter[1], FILTER_BITS);
  
        ++a;
      }
  
      a += src_pixels_per_line - output_width;
      b += output_width;
    }
  }
  
  // Applies a 1-D 2-tap bilinear filter to the source block in either horizontal
  // or vertical direction to produce the filtered output block. Used to implement
  // the second-pass of 2-D separable filter.
  //
  // Requires 16-bit input as produced by filter_block2d_bil_first_pass. Two
  // filter taps should sum to FILTER_WEIGHT. pixel_step defines whether the
  // filter is applied horizontally (pixel_step = 1) or vertically
  // (pixel_step = stride). It defines the offset required to move from one input
  // to the next. Output is 8-bit.
  static void var_filter_block2d_bil_second_pass(const uint16_t *a, uint8_t *b,
                                                 unsigned int src_pixels_per_line,
                                                 unsigned int pixel_step,
                                                 unsigned int output_height,
                                                 unsigned int output_width,
                                                 const uint8_t *filter) {
    unsigned int i, j;
  
    for (i = 0; i < output_height; ++i) {
      for (j = 0; j < output_width; ++j) {
        b[j] = ROUND_POWER_OF_TWO(
            (int)a[0] * filter[0] + (int)a[pixel_step] * filter[1], FILTER_BITS);
        ++a;
      }
  
      a += src_pixels_per_line - output_width;
      b += output_width;
    }
  }
  
  #define VAR(W, H)                                                    \
    uint32_t vpx_variance##W##x##H##_c(const uint8_t *a, int a_stride, \
                                       const uint8_t *b, int b_stride, \
                                       uint32_t *sse) {                \
      int sum;                                                         \
      variance(a, a_stride, b, b_stride, W, H, sse, &sum);             \
      return *sse - (uint32_t)(((int64_t)sum * sum) / (W * H));        \
    }
  
  #define SUBPIX_VAR(W, H)                                                \
    uint32_t vpx_sub_pixel_variance##W##x##H##_c(                         \
        const uint8_t *a, int a_stride, int xoffset, int yoffset,         \
        const uint8_t *b, int b_stride, uint32_t *sse) {                  \
      uint16_t fdata3[(H + 1) * W];                                       \
      uint8_t temp2[H * W];                                               \
                                                                          \
      var_filter_block2d_bil_first_pass(a, fdata3, a_stride, 1, H + 1, W, \
                                        bilinear_filters[xoffset]);       \
      var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W,       \
                                         bilinear_filters[yoffset]);      \
                                                                          \
      return vpx_variance##W##x##H##_c(temp2, W, b, b_stride, sse);       \
    }
  
  #define SUBPIX_AVG_VAR(W, H)                                            \
    uint32_t vpx_sub_pixel_avg_variance##W##x##H##_c(                     \
        const uint8_t *a, int a_stride, int xoffset, int yoffset,         \
        const uint8_t *b, int b_stride, uint32_t *sse,                    \
        const uint8_t *second_pred) {                                     \
      uint16_t fdata3[(H + 1) * W];                                       \
      uint8_t temp2[H * W];                                               \
      DECLARE_ALIGNED(16, uint8_t, temp3[H * W]);                         \
                                                                          \
      var_filter_block2d_bil_first_pass(a, fdata3, a_stride, 1, H + 1, W, \
                                        bilinear_filters[xoffset]);       \
      var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W,       \
                                         bilinear_filters[yoffset]);      \
                                                                          \
      vpx_comp_avg_pred(temp3, second_pred, W, H, temp2, W);              \
                                                                          \
      return vpx_variance##W##x##H##_c(temp3, W, b, b_stride, sse);       \
    }
  
  /* Identical to the variance call except it takes an additional parameter, sum,
   * and returns that value using pass-by-reference instead of returning
   * sse - sum^2 / w*h
   */
  #define GET_VAR(W, H)                                                         \
    void vpx_get##W##x##H##var_c(const uint8_t *a, int a_stride,                \
                                 const uint8_t *b, int b_stride, uint32_t *sse, \
                                 int *sum) {                                    \
      variance(a, a_stride, b, b_stride, W, H, sse, sum);                       \
    }
  
  /* Identical to the variance call except it does not calculate the
   * sse - sum^2 / w*h and returns sse in addtion to modifying the passed in
   * variable.
   */
  #define MSE(W, H)                                               \
    uint32_t vpx_mse##W##x##H##_c(const uint8_t *a, int a_stride, \
                                  const uint8_t *b, int b_stride, \
                                  uint32_t *sse) {                \
      int sum;                                                    \
      variance(a, a_stride, b, b_stride, W, H, sse, &sum);        \
      return *sse;                                                \
    }
  
  /* All three forms of the variance are available in the same sizes. */
  #define VARIANCES(W, H) \
    VAR(W, H)             \
    SUBPIX_VAR(W, H)      \
    SUBPIX_AVG_VAR(W, H)
  
  VARIANCES(64, 64)
  VARIANCES(64, 32)
  VARIANCES(32, 64)
  VARIANCES(32, 32)
  VARIANCES(32, 16)
  VARIANCES(16, 32)
  VARIANCES(16, 16)
  VARIANCES(16, 8)
  VARIANCES(8, 16)
  VARIANCES(8, 8)
  VARIANCES(8, 4)
  VARIANCES(4, 8)
  VARIANCES(4, 4)
  
  GET_VAR(16, 16)
  GET_VAR(8, 8)
  
  MSE(16, 16)
  MSE(16, 8)
  MSE(8, 16)
  MSE(8, 8)
  
  void vpx_comp_avg_pred_c(uint8_t *comp_pred, const uint8_t *pred, int width,
                           int height, const uint8_t *ref, int ref_stride) {
    int i, j;
  
    for (i = 0; i < height; ++i) {
      for (j = 0; j < width; ++j) {
        const int tmp = pred[j] + ref[j];
        comp_pred[j] = ROUND_POWER_OF_TWO(tmp, 1);
      }
      comp_pred += width;
      pred += width;
      ref += ref_stride;
    }
  }
  
  #if CONFIG_VP9_HIGHBITDEPTH
  static void highbd_variance64(const uint8_t *a8, int a_stride,
                                const uint8_t *b8, int b_stride, int w, int h,
                                uint64_t *sse, int64_t *sum) {
    int i, j;
  
    uint16_t *a = CONVERT_TO_SHORTPTR(a8);
    uint16_t *b = CONVERT_TO_SHORTPTR(b8);
    *sum = 0;
    *sse = 0;
  
    for (i = 0; i < h; ++i) {
      for (j = 0; j < w; ++j) {
        const int diff = a[j] - b[j];
        *sum += diff;
        *sse += diff * diff;
      }
      a += a_stride;
      b += b_stride;
    }
  }
  
  static void highbd_8_variance(const uint8_t *a8, int a_stride,
                                const uint8_t *b8, int b_stride, int w, int h,
                                uint32_t *sse, int *sum) {
    uint64_t sse_long = 0;
    int64_t sum_long = 0;
    highbd_variance64(a8, a_stride, b8, b_stride, w, h, &sse_long, &sum_long);
    *sse = (uint32_t)sse_long;
    *sum = (int)sum_long;
  }
  
  static void highbd_10_variance(const uint8_t *a8, int a_stride,
                                 const uint8_t *b8, int b_stride, int w, int h,
                                 uint32_t *sse, int *sum) {
    uint64_t sse_long = 0;
    int64_t sum_long = 0;
    highbd_variance64(a8, a_stride, b8, b_stride, w, h, &sse_long, &sum_long);
    *sse = (uint32_t)ROUND_POWER_OF_TWO(sse_long, 4);
    *sum = (int)ROUND_POWER_OF_TWO(sum_long, 2);
  }
  
  static void highbd_12_variance(const uint8_t *a8, int a_stride,
                                 const uint8_t *b8, int b_stride, int w, int h,
                                 uint32_t *sse, int *sum) {
    uint64_t sse_long = 0;
    int64_t sum_long = 0;
    highbd_variance64(a8, a_stride, b8, b_stride, w, h, &sse_long, &sum_long);
    *sse = (uint32_t)ROUND_POWER_OF_TWO(sse_long, 8);
    *sum = (int)ROUND_POWER_OF_TWO(sum_long, 4);
  }
  
  #define HIGHBD_VAR(W, H)                                                       \
    uint32_t vpx_highbd_8_variance##W##x##H##_c(const uint8_t *a, int a_stride,  \
                                                const uint8_t *b, int b_stride,  \
                                                uint32_t *sse) {                 \
      int sum;                                                                   \
      highbd_8_variance(a, a_stride, b, b_stride, W, H, sse, &sum);              \
      return *sse - (((int64_t)sum * sum) / (W * H));                            \
    }                                                                            \
                                                                                 \
    uint32_t vpx_highbd_10_variance##W##x##H##_c(const uint8_t *a, int a_stride, \
                                                 const uint8_t *b, int b_stride, \
                                                 uint32_t *sse) {                \
      int sum;                                                                   \
      int64_t var;                                                               \
      highbd_10_variance(a, a_stride, b, b_stride, W, H, sse, &sum);             \
      var = (int64_t)(*sse) - (((int64_t)sum * sum) / (W * H));                  \
      return (var >= 0) ? (uint32_t)var : 0;                                     \
    }                                                                            \
                                                                                 \
    uint32_t vpx_highbd_12_variance##W##x##H##_c(const uint8_t *a, int a_stride, \
                                                 const uint8_t *b, int b_stride, \
                                                 uint32_t *sse) {                \
      int sum;                                                                   \
      int64_t var;                                                               \
      highbd_12_variance(a, a_stride, b, b_stride, W, H, sse, &sum);             \
      var = (int64_t)(*sse) - (((int64_t)sum * sum) / (W * H));                  \
      return (var >= 0) ? (uint32_t)var : 0;                                     \
    }
  
  #define HIGHBD_GET_VAR(S)                                                    \
    void vpx_highbd_8_get##S##x##S##var_c(const uint8_t *src, int src_stride,  \
                                          const uint8_t *ref, int ref_stride,  \
                                          uint32_t *sse, int *sum) {           \
      highbd_8_variance(src, src_stride, ref, ref_stride, S, S, sse, sum);     \
    }                                                                          \
                                                                               \
    void vpx_highbd_10_get##S##x##S##var_c(const uint8_t *src, int src_stride, \
                                           const uint8_t *ref, int ref_stride, \
                                           uint32_t *sse, int *sum) {          \
      highbd_10_variance(src, src_stride, ref, ref_stride, S, S, sse, sum);    \
    }                                                                          \
                                                                               \
    void vpx_highbd_12_get##S##x##S##var_c(const uint8_t *src, int src_stride, \
                                           const uint8_t *ref, int ref_stride, \
                                           uint32_t *sse, int *sum) {          \
      highbd_12_variance(src, src_stride, ref, ref_stride, S, S, sse, sum);    \
    }
  
  #define HIGHBD_MSE(W, H)                                                      \
    uint32_t vpx_highbd_8_mse##W##x##H##_c(const uint8_t *src, int src_stride,  \
                                           const uint8_t *ref, int ref_stride,  \
                                           uint32_t *sse) {                     \
      int sum;                                                                  \
      highbd_8_variance(src, src_stride, ref, ref_stride, W, H, sse, &sum);     \
      return *sse;                                                              \
    }                                                                           \
                                                                                \
    uint32_t vpx_highbd_10_mse##W##x##H##_c(const uint8_t *src, int src_stride, \
                                            const uint8_t *ref, int ref_stride, \
                                            uint32_t *sse) {                    \
      int sum;                                                                  \
      highbd_10_variance(src, src_stride, ref, ref_stride, W, H, sse, &sum);    \
      return *sse;                                                              \
    }                                                                           \
                                                                                \
    uint32_t vpx_highbd_12_mse##W##x##H##_c(const uint8_t *src, int src_stride, \
                                            const uint8_t *ref, int ref_stride, \
                                            uint32_t *sse) {                    \
      int sum;                                                                  \
      highbd_12_variance(src, src_stride, ref, ref_stride, W, H, sse, &sum);    \
      return *sse;                                                              \
    }
  
  static void highbd_var_filter_block2d_bil_first_pass(
      const uint8_t *src_ptr8, uint16_t *output_ptr,
      unsigned int src_pixels_per_line, int pixel_step,
      unsigned int output_height, unsigned int output_width,
      const uint8_t *filter) {
    unsigned int i, j;
    uint16_t *src_ptr = CONVERT_TO_SHORTPTR(src_ptr8);
    for (i = 0; i < output_height; ++i) {
      for (j = 0; j < output_width; ++j) {
        output_ptr[j] = ROUND_POWER_OF_TWO(
            (int)src_ptr[0] * filter[0] + (int)src_ptr[pixel_step] * filter[1],
            FILTER_BITS);
  
        ++src_ptr;
      }
  
      // Next row...
      src_ptr += src_pixels_per_line - output_width;
      output_ptr += output_width;
    }
  }
  
  static void highbd_var_filter_block2d_bil_second_pass(
      const uint16_t *src_ptr, uint16_t *output_ptr,
      unsigned int src_pixels_per_line, unsigned int pixel_step,
      unsigned int output_height, unsigned int output_width,
      const uint8_t *filter) {
    unsigned int i, j;
  
    for (i = 0; i < output_height; ++i) {
      for (j = 0; j < output_width; ++j) {
        output_ptr[j] = ROUND_POWER_OF_TWO(
            (int)src_ptr[0] * filter[0] + (int)src_ptr[pixel_step] * filter[1],
            FILTER_BITS);
        ++src_ptr;
      }
  
      src_ptr += src_pixels_per_line - output_width;
      output_ptr += output_width;
    }
  }
  
  #define HIGHBD_SUBPIX_VAR(W, H)                                              \
    uint32_t vpx_highbd_8_sub_pixel_variance##W##x##H##_c(                     \
        const uint8_t *src, int src_stride, int xoffset, int yoffset,          \
        const uint8_t *dst, int dst_stride, uint32_t *sse) {                   \
      uint16_t fdata3[(H + 1) * W];                                            \
      uint16_t temp2[H * W];                                                   \
                                                                               \
      highbd_var_filter_block2d_bil_first_pass(                                \
          src, fdata3, src_stride, 1, H + 1, W, bilinear_filters[xoffset]);    \
      highbd_var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W,     \
                                                bilinear_filters[yoffset]);    \
                                                                               \
      return vpx_highbd_8_variance##W##x##H##_c(CONVERT_TO_BYTEPTR(temp2), W,  \
                                                dst, dst_stride, sse);         \
    }                                                                          \
                                                                               \
    uint32_t vpx_highbd_10_sub_pixel_variance##W##x##H##_c(                    \
        const uint8_t *src, int src_stride, int xoffset, int yoffset,          \
        const uint8_t *dst, int dst_stride, uint32_t *sse) {                   \
      uint16_t fdata3[(H + 1) * W];                                            \
      uint16_t temp2[H * W];                                                   \
                                                                               \
      highbd_var_filter_block2d_bil_first_pass(                                \
          src, fdata3, src_stride, 1, H + 1, W, bilinear_filters[xoffset]);    \
      highbd_var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W,     \
                                                bilinear_filters[yoffset]);    \
                                                                               \
      return vpx_highbd_10_variance##W##x##H##_c(CONVERT_TO_BYTEPTR(temp2), W, \
                                                 dst, dst_stride, sse);        \
    }                                                                          \
                                                                               \
    uint32_t vpx_highbd_12_sub_pixel_variance##W##x##H##_c(                    \
        const uint8_t *src, int src_stride, int xoffset, int yoffset,          \
        const uint8_t *dst, int dst_stride, uint32_t *sse) {                   \
      uint16_t fdata3[(H + 1) * W];                                            \
      uint16_t temp2[H * W];                                                   \
                                                                               \
      highbd_var_filter_block2d_bil_first_pass(                                \
          src, fdata3, src_stride, 1, H + 1, W, bilinear_filters[xoffset]);    \
      highbd_var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W,     \
                                                bilinear_filters[yoffset]);    \
                                                                               \
      return vpx_highbd_12_variance##W##x##H##_c(CONVERT_TO_BYTEPTR(temp2), W, \
                                                 dst, dst_stride, sse);        \
    }
  
  #define HIGHBD_SUBPIX_AVG_VAR(W, H)                                          \
    uint32_t vpx_highbd_8_sub_pixel_avg_variance##W##x##H##_c(                 \
        const uint8_t *src, int src_stride, int xoffset, int yoffset,          \
        const uint8_t *dst, int dst_stride, uint32_t *sse,                     \
        const uint8_t *second_pred) {                                          \
      uint16_t fdata3[(H + 1) * W];                                            \
      uint16_t temp2[H * W];                                                   \
      DECLARE_ALIGNED(16, uint16_t, temp3[H * W]);                             \
                                                                               \
      highbd_var_filter_block2d_bil_first_pass(                                \
          src, fdata3, src_stride, 1, H + 1, W, bilinear_filters[xoffset]);    \
      highbd_var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W,     \
                                                bilinear_filters[yoffset]);    \
                                                                               \
      vpx_highbd_comp_avg_pred(temp3, second_pred, W, H,                       \
                               CONVERT_TO_BYTEPTR(temp2), W);                  \
                                                                               \
      return vpx_highbd_8_variance##W##x##H##_c(CONVERT_TO_BYTEPTR(temp3), W,  \
                                                dst, dst_stride, sse);         \
    }                                                                          \
                                                                               \
    uint32_t vpx_highbd_10_sub_pixel_avg_variance##W##x##H##_c(                \
        const uint8_t *src, int src_stride, int xoffset, int yoffset,          \
        const uint8_t *dst, int dst_stride, uint32_t *sse,                     \
        const uint8_t *second_pred) {                                          \
      uint16_t fdata3[(H + 1) * W];                                            \
      uint16_t temp2[H * W];                                                   \
      DECLARE_ALIGNED(16, uint16_t, temp3[H * W]);                             \
                                                                               \
      highbd_var_filter_block2d_bil_first_pass(                                \
          src, fdata3, src_stride, 1, H + 1, W, bilinear_filters[xoffset]);    \
      highbd_var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W,     \
                                                bilinear_filters[yoffset]);    \
                                                                               \
      vpx_highbd_comp_avg_pred(temp3, second_pred, W, H,                       \
                               CONVERT_TO_BYTEPTR(temp2), W);                  \
                                                                               \
      return vpx_highbd_10_variance##W##x##H##_c(CONVERT_TO_BYTEPTR(temp3), W, \
                                                 dst, dst_stride, sse);        \
    }                                                                          \
                                                                               \
    uint32_t vpx_highbd_12_sub_pixel_avg_variance##W##x##H##_c(                \
        const uint8_t *src, int src_stride, int xoffset, int yoffset,          \
        const uint8_t *dst, int dst_stride, uint32_t *sse,                     \
        const uint8_t *second_pred) {                                          \
      uint16_t fdata3[(H + 1) * W];                                            \
      uint16_t temp2[H * W];                                                   \
      DECLARE_ALIGNED(16, uint16_t, temp3[H * W]);                             \
                                                                               \
      highbd_var_filter_block2d_bil_first_pass(                                \
          src, fdata3, src_stride, 1, H + 1, W, bilinear_filters[xoffset]);    \
      highbd_var_filter_block2d_bil_second_pass(fdata3, temp2, W, W, H, W,     \
                                                bilinear_filters[yoffset]);    \
                                                                               \
      vpx_highbd_comp_avg_pred(temp3, second_pred, W, H,                       \
                               CONVERT_TO_BYTEPTR(temp2), W);                  \
                                                                               \
      return vpx_highbd_12_variance##W##x##H##_c(CONVERT_TO_BYTEPTR(temp3), W, \
                                                 dst, dst_stride, sse);        \
    }
  
  /* All three forms of the variance are available in the same sizes. */
  #define HIGHBD_VARIANCES(W, H) \
    HIGHBD_VAR(W, H)             \
    HIGHBD_SUBPIX_VAR(W, H)      \
    HIGHBD_SUBPIX_AVG_VAR(W, H)
  
  HIGHBD_VARIANCES(64, 64)
  HIGHBD_VARIANCES(64, 32)
  HIGHBD_VARIANCES(32, 64)
  HIGHBD_VARIANCES(32, 32)
  HIGHBD_VARIANCES(32, 16)
  HIGHBD_VARIANCES(16, 32)
  HIGHBD_VARIANCES(16, 16)
  HIGHBD_VARIANCES(16, 8)
  HIGHBD_VARIANCES(8, 16)
  HIGHBD_VARIANCES(8, 8)
  HIGHBD_VARIANCES(8, 4)
  HIGHBD_VARIANCES(4, 8)
  HIGHBD_VARIANCES(4, 4)
  
  HIGHBD_GET_VAR(8)
  HIGHBD_GET_VAR(16)
  
  HIGHBD_MSE(16, 16)
  HIGHBD_MSE(16, 8)
  HIGHBD_MSE(8, 16)
  HIGHBD_MSE(8, 8)
  
  void vpx_highbd_comp_avg_pred(uint16_t *comp_pred, const uint8_t *pred8,
                                int width, int height, const uint8_t *ref8,
                                int ref_stride) {
    int i, j;
    uint16_t *pred = CONVERT_TO_SHORTPTR(pred8);
    uint16_t *ref = CONVERT_TO_SHORTPTR(ref8);
    for (i = 0; i < height; ++i) {
      for (j = 0; j < width; ++j) {
        const int tmp = pred[j] + ref[j];
        comp_pred[j] = ROUND_POWER_OF_TWO(tmp, 1);
      }
      comp_pred += width;
      pred += width;
      ref += ref_stride;
    }
  }
  #endif  // CONFIG_VP9_HIGHBITDEPTH
  