text: /*****************************************************************************
   * dct.c: transform and zigzag
   *****************************************************************************
   * Copyright (C) 2003-2014 x264 project
   *
   * Authors: Loren Merritt <lorenm@u.washington.edu>
   *          Laurent Aimar <fenrir@via.ecp.fr>
   *          Henrik Gramner <henrik@gramner.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02111, USA.
   *
   * This program is also available under a commercial proprietary license.
   * For more information, contact us at licensing@x264.com.
   *****************************************************************************/
  
  #include "common.h"
  #if HAVE_MMX
  #   include "x86/dct.h"
  #endif
  #if ARCH_PPC
  #   include "ppc/dct.h"
  #endif
  #if ARCH_ARM
  #   include "arm/dct.h"
  #endif
  #if ARCH_AARCH64
  #   include "aarch64/dct.h"
  #endif
  
  /* the inverse of the scaling factors introduced by 8x8 fdct */
  /* uint32 is for the asm implementation of trellis. the actual values fit in uint16. */
  #define W(i) (i==0 ? FIX8(1.0000) :\
                i==1 ? FIX8(0.8859) :\
                i==2 ? FIX8(1.6000) :\
                i==3 ? FIX8(0.9415) :\
                i==4 ? FIX8(1.2651) :\
                i==5 ? FIX8(1.1910) :0)
  const uint32_t x264_dct8_weight_tab[64] = {
      W(0), W(3), W(4), W(3),  W(0), W(3), W(4), W(3),
      W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1),
      W(4), W(5), W(2), W(5),  W(4), W(5), W(2), W(5),
      W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1),
  
      W(0), W(3), W(4), W(3),  W(0), W(3), W(4), W(3),
      W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1),
      W(4), W(5), W(2), W(5),  W(4), W(5), W(2), W(5),
      W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1)
  };
  #undef W
  
  #define W(i) (i==0 ? FIX8(1.76777) :\
                i==1 ? FIX8(1.11803) :\
                i==2 ? FIX8(0.70711) :0)
  const uint32_t x264_dct4_weight_tab[16] = {
      W(0), W(1), W(0), W(1),
      W(1), W(2), W(1), W(2),
      W(0), W(1), W(0), W(1),
      W(1), W(2), W(1), W(2)
  };
  #undef W
  
  /* inverse squared */
  #define W(i) (i==0 ? FIX8(3.125) :\
                i==1 ? FIX8(1.25) :\
                i==2 ? FIX8(0.5) :0)
  const uint32_t x264_dct4_weight2_tab[16] = {
      W(0), W(1), W(0), W(1),
      W(1), W(2), W(1), W(2),
      W(0), W(1), W(0), W(1),
      W(1), W(2), W(1), W(2)
  };
  #undef W
  
  #define W(i) (i==0 ? FIX8(1.00000) :\
                i==1 ? FIX8(0.78487) :\
                i==2 ? FIX8(2.56132) :\
                i==3 ? FIX8(0.88637) :\
                i==4 ? FIX8(1.60040) :\
                i==5 ? FIX8(1.41850) :0)
  const uint32_t x264_dct8_weight2_tab[64] = {
      W(0), W(3), W(4), W(3),  W(0), W(3), W(4), W(3),
      W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1),
      W(4), W(5), W(2), W(5),  W(4), W(5), W(2), W(5),
      W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1),
  
      W(0), W(3), W(4), W(3),  W(0), W(3), W(4), W(3),
      W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1),
      W(4), W(5), W(2), W(5),  W(4), W(5), W(2), W(5),
      W(3), W(1), W(5), W(1),  W(3), W(1), W(5), W(1)
  };
  #undef W
  
  
  static void dct4x4dc( dctcoef d[16] )
  {
      dctcoef tmp[16];
      int i;
  
      for( i = 0; i < 4; i++ )
      {
          int s01 = d[i*4+0] + d[i*4+1];
          int d01 = d[i*4+0] - d[i*4+1];
          int s23 = d[i*4+2] + d[i*4+3];
          int d23 = d[i*4+2] - d[i*4+3];
  
          tmp[0*4+i] = s01 + s23;
          tmp[1*4+i] = s01 - s23;
          tmp[2*4+i] = d01 - d23;
          tmp[3*4+i] = d01 + d23;
      }
  
      for( i = 0; i < 4; i++ )
      {
          int s01 = tmp[i*4+0] + tmp[i*4+1];
          int d01 = tmp[i*4+0] - tmp[i*4+1];
          int s23 = tmp[i*4+2] + tmp[i*4+3];
          int d23 = tmp[i*4+2] - tmp[i*4+3];
  
          d[i*4+0] = ( s01 + s23 + 1 ) >> 1;
          d[i*4+1] = ( s01 - s23 + 1 ) >> 1;
          d[i*4+2] = ( d01 - d23 + 1 ) >> 1;
          d[i*4+3] = ( d01 + d23 + 1 ) >> 1;
      }
  }
  
  static void idct4x4dc( dctcoef d[16] )
  {
      dctcoef tmp[16];
      int i;
  
      for( i = 0; i < 4; i++ )
      {
          int s01 = d[i*4+0] + d[i*4+1];
          int d01 = d[i*4+0] - d[i*4+1];
          int s23 = d[i*4+2] + d[i*4+3];
          int d23 = d[i*4+2] - d[i*4+3];
  
          tmp[0*4+i] = s01 + s23;
          tmp[1*4+i] = s01 - s23;
          tmp[2*4+i] = d01 - d23;
          tmp[3*4+i] = d01 + d23;
      }
  
      for( i = 0; i < 4; i++ )
      {
          int s01 = tmp[i*4+0] + tmp[i*4+1];
          int d01 = tmp[i*4+0] - tmp[i*4+1];
          int s23 = tmp[i*4+2] + tmp[i*4+3];
          int d23 = tmp[i*4+2] - tmp[i*4+3];
  
          d[i*4+0] = s01 + s23;
          d[i*4+1] = s01 - s23;
          d[i*4+2] = d01 - d23;
          d[i*4+3] = d01 + d23;
      }
  }
  
  static void dct2x4dc( dctcoef dct[8], dctcoef dct4x4[8][16] )
  {
      int a0 = dct4x4[0][0] + dct4x4[1][0];
      int a1 = dct4x4[2][0] + dct4x4[3][0];
      int a2 = dct4x4[4][0] + dct4x4[5][0];
      int a3 = dct4x4[6][0] + dct4x4[7][0];
      int a4 = dct4x4[0][0] - dct4x4[1][0];
      int a5 = dct4x4[2][0] - dct4x4[3][0];
      int a6 = dct4x4[4][0] - dct4x4[5][0];
      int a7 = dct4x4[6][0] - dct4x4[7][0];
      int b0 = a0 + a1;
      int b1 = a2 + a3;
      int b2 = a4 + a5;
      int b3 = a6 + a7;
      int b4 = a0 - a1;
      int b5 = a2 - a3;
      int b6 = a4 - a5;
      int b7 = a6 - a7;
      dct[0] = b0 + b1;
      dct[1] = b2 + b3;
      dct[2] = b0 - b1;
      dct[3] = b2 - b3;
      dct[4] = b4 - b5;
      dct[5] = b6 - b7;
      dct[6] = b4 + b5;
      dct[7] = b6 + b7;
      dct4x4[0][0] = 0;
      dct4x4[1][0] = 0;
      dct4x4[2][0] = 0;
      dct4x4[3][0] = 0;
      dct4x4[4][0] = 0;
      dct4x4[5][0] = 0;
      dct4x4[6][0] = 0;
      dct4x4[7][0] = 0;
  }
  
  static inline void pixel_sub_wxh( dctcoef *diff, int i_size,
                                    pixel *pix1, int i_pix1, pixel *pix2, int i_pix2 )
  {
  	int y;
  	int x;
  
  	for( y = 0; y < i_size; y++ )
      {
          for( x = 0; x < i_size; x++ )
              diff[x + y*i_size] = pix1[x] - pix2[x];
          pix1 += i_pix1;
          pix2 += i_pix2;
      }
  }
  
  static void sub4x4_dct( dctcoef dct[16], pixel *pix1, pixel *pix2 )
  {
      dctcoef d[16];
      dctcoef tmp[16];
  	int i;
  
      pixel_sub_wxh( d, 4, pix1, FENC_STRIDE, pix2, FDEC_STRIDE );
  
      for( i = 0; i < 4; i++ )
      {
          int s03 = d[i*4+0] + d[i*4+3];
          int s12 = d[i*4+1] + d[i*4+2];
          int d03 = d[i*4+0] - d[i*4+3];
          int d12 = d[i*4+1] - d[i*4+2];
  
          tmp[0*4+i] =   s03 +   s12;
          tmp[1*4+i] = 2*d03 +   d12;
          tmp[2*4+i] =   s03 -   s12;
          tmp[3*4+i] =   d03 - 2*d12;
      }
  
      for( i = 0; i < 4; i++ )
      {
          int s03 = tmp[i*4+0] + tmp[i*4+3];
          int s12 = tmp[i*4+1] + tmp[i*4+2];
          int d03 = tmp[i*4+0] - tmp[i*4+3];
          int d12 = tmp[i*4+1] - tmp[i*4+2];
  
          dct[i*4+0] =   s03 +   s12;
          dct[i*4+1] = 2*d03 +   d12;
          dct[i*4+2] =   s03 -   s12;
          dct[i*4+3] =   d03 - 2*d12;
      }
  }
  
  static void sub8x8_dct( dctcoef dct[4][16], pixel *pix1, pixel *pix2 )
  {
      sub4x4_dct( dct[0], &pix1[0], &pix2[0] );
      sub4x4_dct( dct[1], &pix1[4], &pix2[4] );
      sub4x4_dct( dct[2], &pix1[4*FENC_STRIDE+0], &pix2[4*FDEC_STRIDE+0] );
      sub4x4_dct( dct[3], &pix1[4*FENC_STRIDE+4], &pix2[4*FDEC_STRIDE+4] );
  }
  
  static void sub16x16_dct( dctcoef dct[16][16], pixel *pix1, pixel *pix2 )
  {
      sub8x8_dct( &dct[ 0], &pix1[0], &pix2[0] );
      sub8x8_dct( &dct[ 4], &pix1[8], &pix2[8] );
      sub8x8_dct( &dct[ 8], &pix1[8*FENC_STRIDE+0], &pix2[8*FDEC_STRIDE+0] );
      sub8x8_dct( &dct[12], &pix1[8*FENC_STRIDE+8], &pix2[8*FDEC_STRIDE+8] );
  }
  
  static int sub4x4_dct_dc( pixel *pix1, pixel *pix2 )
  {
      int sum = 0;
  	int i;
  
  	for( i=0; i<4; i++, pix1 += FENC_STRIDE, pix2 += FDEC_STRIDE )
          sum += pix1[0] + pix1[1] + pix1[2] + pix1[3]
               - pix2[0] - pix2[1] - pix2[2] - pix2[3];
      return sum;
  }
  
  static void sub8x8_dct_dc( dctcoef dct[4], pixel *pix1, pixel *pix2 )
  {
      int d0;
      int d1;
      int d2;
      int d3;
  
  	dct[0] = sub4x4_dct_dc( &pix1[0], &pix2[0] );
      dct[1] = sub4x4_dct_dc( &pix1[4], &pix2[4] );
      dct[2] = sub4x4_dct_dc( &pix1[4*FENC_STRIDE+0], &pix2[4*FDEC_STRIDE+0] );
      dct[3] = sub4x4_dct_dc( &pix1[4*FENC_STRIDE+4], &pix2[4*FDEC_STRIDE+4] );
  
      /* 2x2 DC transform */
      d0 = dct[0] + dct[1];
      d1 = dct[2] + dct[3];
      d2 = dct[0] - dct[1];
      d3 = dct[2] - dct[3];
      dct[0] = d0 + d1;
      dct[1] = d0 - d1;
      dct[2] = d2 + d3;
      dct[3] = d2 - d3;
  }
  
  static void sub8x16_dct_dc( dctcoef dct[8], pixel *pix1, pixel *pix2 )
  {
      int a0 = sub4x4_dct_dc( &pix1[ 0*FENC_STRIDE+0], &pix2[ 0*FDEC_STRIDE+0] );
      int a1 = sub4x4_dct_dc( &pix1[ 0*FENC_STRIDE+4], &pix2[ 0*FDEC_STRIDE+4] );
      int a2 = sub4x4_dct_dc( &pix1[ 4*FENC_STRIDE+0], &pix2[ 4*FDEC_STRIDE+0] );
      int a3 = sub4x4_dct_dc( &pix1[ 4*FENC_STRIDE+4], &pix2[ 4*FDEC_STRIDE+4] );
      int a4 = sub4x4_dct_dc( &pix1[ 8*FENC_STRIDE+0], &pix2[ 8*FDEC_STRIDE+0] );
      int a5 = sub4x4_dct_dc( &pix1[ 8*FENC_STRIDE+4], &pix2[ 8*FDEC_STRIDE+4] );
      int a6 = sub4x4_dct_dc( &pix1[12*FENC_STRIDE+0], &pix2[12*FDEC_STRIDE+0] );
      int a7 = sub4x4_dct_dc( &pix1[12*FENC_STRIDE+4], &pix2[12*FDEC_STRIDE+4] );
  
      /* 2x4 DC transform */
      int b0 = a0 + a1;
      int b1 = a2 + a3;
      int b2 = a4 + a5;
      int b3 = a6 + a7;
      int b4 = a0 - a1;
      int b5 = a2 - a3;
      int b6 = a4 - a5;
      int b7 = a6 - a7;
      a0 = b0 + b1;
      a1 = b2 + b3;
      a2 = b4 + b5;
      a3 = b6 + b7;
      a4 = b0 - b1;
      a5 = b2 - b3;
      a6 = b4 - b5;
      a7 = b6 - b7;
      dct[0] = a0 + a1;
      dct[1] = a2 + a3;
      dct[2] = a0 - a1;
      dct[3] = a2 - a3;
      dct[4] = a4 - a5;
      dct[5] = a6 - a7;
      dct[6] = a4 + a5;
      dct[7] = a6 + a7;
  }
  
  static void add4x4_idct( pixel *p_dst, dctcoef dct[16] )
  {
      dctcoef d[16];
      dctcoef tmp[16];
      int i;
  	int y;
  
      for( i = 0; i < 4; i++ )
      {
          int s02 =  dct[0*4+i]     +  dct[2*4+i];
          int d02 =  dct[0*4+i]     -  dct[2*4+i];
          int s13 =  dct[1*4+i]     + (dct[3*4+i]>>1);
          int d13 = (dct[1*4+i]>>1) -  dct[3*4+i];
  
          tmp[i*4+0] = s02 + s13;
          tmp[i*4+1] = d02 + d13;
          tmp[i*4+2] = d02 - d13;
          tmp[i*4+3] = s02 - s13;
      }
  
      for( i = 0; i < 4; i++ )
      {
          int s02 =  tmp[0*4+i]     +  tmp[2*4+i];
          int d02 =  tmp[0*4+i]     -  tmp[2*4+i];
          int s13 =  tmp[1*4+i]     + (tmp[3*4+i]>>1);
          int d13 = (tmp[1*4+i]>>1) -  tmp[3*4+i];
  
          d[0*4+i] = ( s02 + s13 + 32 ) >> 6;
          d[1*4+i] = ( d02 + d13 + 32 ) >> 6;
          d[2*4+i] = ( d02 - d13 + 32 ) >> 6;
          d[3*4+i] = ( s02 - s13 + 32 ) >> 6;
      }
  	
      for( y = 0; y < 4; y++ )
      {
  		int x;
  		for( x = 0; x < 4; x++ )
              p_dst[x] = x264_clip_pixel( p_dst[x] + d[y*4+x] );
          p_dst += FDEC_STRIDE;
      }
  }
  
  static void add8x8_idct( pixel *p_dst, dctcoef dct[4][16] )
  {
      add4x4_idct( &p_dst[0],               dct[0] );
      add4x4_idct( &p_dst[4],               dct[1] );
      add4x4_idct( &p_dst[4*FDEC_STRIDE+0], dct[2] );
      add4x4_idct( &p_dst[4*FDEC_STRIDE+4], dct[3] );
  }
  
  static void add16x16_idct( pixel *p_dst, dctcoef dct[16][16] )
  {
      add8x8_idct( &p_dst[0],               &dct[0] );
      add8x8_idct( &p_dst[8],               &dct[4] );
      add8x8_idct( &p_dst[8*FDEC_STRIDE+0], &dct[8] );
      add8x8_idct( &p_dst[8*FDEC_STRIDE+8], &dct[12] );
  }
  
  /****************************************************************************
   * 8x8 transform:
   ****************************************************************************/
  
  #define DCT8_1D {\
      int s07 = SRC(0) + SRC(7);\
      int s16 = SRC(1) + SRC(6);\
      int s25 = SRC(2) + SRC(5);\
      int s34 = SRC(3) + SRC(4);\
      int a0 = s07 + s34;\
      int a1 = s16 + s25;\
      int a2 = s07 - s34;\
      int a3 = s16 - s25;\
      int d07 = SRC(0) - SRC(7);\
      int d16 = SRC(1) - SRC(6);\
      int d25 = SRC(2) - SRC(5);\
      int d34 = SRC(3) - SRC(4);\
      int a4 = d16 + d25 + (d07 + (d07>>1));\
      int a5 = d07 - d34 - (d25 + (d25>>1));\
      int a6 = d07 + d34 - (d16 + (d16>>1));\
      int a7 = d16 - d25 + (d34 + (d34>>1));\
      DST(0) =  a0 + a1     ;\
      DST(1) =  a4 + (a7>>2);\
      DST(2) =  a2 + (a3>>1);\
      DST(3) =  a5 + (a6>>2);\
      DST(4) =  a0 - a1     ;\
      DST(5) =  a6 - (a5>>2);\
      DST(6) = (a2>>1) - a3 ;\
      DST(7) = (a4>>2) - a7 ;\
  }
  
  static void sub8x8_dct8( dctcoef dct[64], pixel *pix1, pixel *pix2 )
  {
      dctcoef tmp[64];
  	int i;
  
      pixel_sub_wxh( tmp, 8, pix1, FENC_STRIDE, pix2, FDEC_STRIDE );
  
  #define SRC(x) tmp[x*8+i]
  #define DST(x) tmp[x*8+i]
      for( i = 0; i < 8; i++ )
          DCT8_1D
  #undef SRC
  #undef DST
  
  #define SRC(x) tmp[i*8+x]
  #define DST(x) dct[x*8+i]
      for( i = 0; i < 8; i++ )
          DCT8_1D
  #undef SRC
  #undef DST
  }
  
  static void sub16x16_dct8( dctcoef dct[4][64], pixel *pix1, pixel *pix2 )
  {
      sub8x8_dct8( dct[0], &pix1[0],               &pix2[0] );
      sub8x8_dct8( dct[1], &pix1[8],               &pix2[8] );
      sub8x8_dct8( dct[2], &pix1[8*FENC_STRIDE+0], &pix2[8*FDEC_STRIDE+0] );
      sub8x8_dct8( dct[3], &pix1[8*FENC_STRIDE+8], &pix2[8*FDEC_STRIDE+8] );
  }
  
  #define IDCT8_1D {\
      int a0 =  SRC(0) + SRC(4);\
      int a2 =  SRC(0) - SRC(4);\
      int a4 = (SRC(2)>>1) - SRC(6);\
      int a6 = (SRC(6)>>1) + SRC(2);\
      int b0 = a0 + a6;\
      int b2 = a2 + a4;\
      int b4 = a2 - a4;\
      int b6 = a0 - a6;\
      int a1 = -SRC(3) + SRC(5) - SRC(7) - (SRC(7)>>1);\
      int a3 =  SRC(1) + SRC(7) - SRC(3) - (SRC(3)>>1);\
      int a5 = -SRC(1) + SRC(7) + SRC(5) + (SRC(5)>>1);\
      int a7 =  SRC(3) + SRC(5) + SRC(1) + (SRC(1)>>1);\
      int b1 = (a7>>2) + a1;\
      int b3 =  a3 + (a5>>2);\
      int b5 = (a3>>2) - a5;\
      int b7 =  a7 - (a1>>2);\
      DST(0, b0 + b7);\
      DST(1, b2 + b5);\
      DST(2, b4 + b3);\
      DST(3, b6 + b1);\
      DST(4, b6 - b1);\
      DST(5, b4 - b3);\
      DST(6, b2 - b5);\
      DST(7, b0 - b7);\
  }
  
  static void add8x8_idct8( pixel *dst, dctcoef dct[64] )
  {
  	int i;
  
  	dct[0] += 32; // rounding for the >>6 at the end
  
  #define SRC(x)     dct[x*8+i]
  #define DST(x,rhs) dct[x*8+i] = (rhs)
      for( i = 0; i < 8; i++ )
          IDCT8_1D
  #undef SRC
  #undef DST
  
  #define SRC(x)     dct[i*8+x]
  #define DST(x,rhs) dst[i + x*FDEC_STRIDE] = x264_clip_pixel( dst[i + x*FDEC_STRIDE] + ((rhs) >> 6) );
      for( i = 0; i < 8; i++ )
          IDCT8_1D
  #undef SRC
  #undef DST
  }
  
  static void add16x16_idct8( pixel *dst, dctcoef dct[4][64] )
  {
      add8x8_idct8( &dst[0],               dct[0] );
      add8x8_idct8( &dst[8],               dct[1] );
      add8x8_idct8( &dst[8*FDEC_STRIDE+0], dct[2] );
      add8x8_idct8( &dst[8*FDEC_STRIDE+8], dct[3] );
  }
  
  static void inline add4x4_idct_dc( pixel *p_dst, dctcoef dc )
  {
  	int i;
  
  	dc = (dc + 32) >> 6;
      for( i = 0; i < 4; i++, p_dst += FDEC_STRIDE )
      {
          p_dst[0] = x264_clip_pixel( p_dst[0] + dc );
          p_dst[1] = x264_clip_pixel( p_dst[1] + dc );
          p_dst[2] = x264_clip_pixel( p_dst[2] + dc );
          p_dst[3] = x264_clip_pixel( p_dst[3] + dc );
      }
  }
  
  static void add8x8_idct_dc( pixel *p_dst, dctcoef dct[4] )
  {
      add4x4_idct_dc( &p_dst[0],               dct[0] );
      add4x4_idct_dc( &p_dst[4],               dct[1] );
      add4x4_idct_dc( &p_dst[4*FDEC_STRIDE+0], dct[2] );
      add4x4_idct_dc( &p_dst[4*FDEC_STRIDE+4], dct[3] );
  }
  
  static void add16x16_idct_dc( pixel *p_dst, dctcoef dct[16] )
  {
  	int i;
  
  	for( i = 0; i < 4; i++, dct += 4, p_dst += 4*FDEC_STRIDE )
      {
          add4x4_idct_dc( &p_dst[ 0], dct[0] );
          add4x4_idct_dc( &p_dst[ 4], dct[1] );
          add4x4_idct_dc( &p_dst[ 8], dct[2] );
          add4x4_idct_dc( &p_dst[12], dct[3] );
      }
  }
  
  
  /****************************************************************************
   * x264_dct_init:
   ****************************************************************************/
  void x264_dct_init( int cpu, x264_dct_function_t *dctf )
  {
      dctf->sub4x4_dct    = sub4x4_dct;
      dctf->add4x4_idct   = add4x4_idct;
  
      dctf->sub8x8_dct    = sub8x8_dct;
      dctf->sub8x8_dct_dc = sub8x8_dct_dc;
      dctf->add8x8_idct   = add8x8_idct;
      dctf->add8x8_idct_dc = add8x8_idct_dc;
  
      dctf->sub8x16_dct_dc = sub8x16_dct_dc;
  
      dctf->sub16x16_dct  = sub16x16_dct;
      dctf->add16x16_idct = add16x16_idct;
      dctf->add16x16_idct_dc = add16x16_idct_dc;
  
      dctf->sub8x8_dct8   = sub8x8_dct8;
      dctf->add8x8_idct8  = add8x8_idct8;
  
      dctf->sub16x16_dct8  = sub16x16_dct8;
      dctf->add16x16_idct8 = add16x16_idct8;
  
      dctf->dct4x4dc  = dct4x4dc;
      dctf->idct4x4dc = idct4x4dc;
  
      dctf->dct2x4dc = dct2x4dc;
  
  #if HIGH_BIT_DEPTH
  #if HAVE_MMX
      if( cpu&X264_CPU_MMX )
      {
          dctf->sub4x4_dct    = x264_sub4x4_dct_mmx;
          dctf->sub8x8_dct    = x264_sub8x8_dct_mmx;
          dctf->sub16x16_dct  = x264_sub16x16_dct_mmx;
      }
      if( cpu&X264_CPU_SSE2 )
      {
          dctf->add4x4_idct     = x264_add4x4_idct_sse2;
          dctf->dct4x4dc        = x264_dct4x4dc_sse2;
          dctf->idct4x4dc       = x264_idct4x4dc_sse2;
          dctf->sub8x8_dct8     = x264_sub8x8_dct8_sse2;
          dctf->sub16x16_dct8   = x264_sub16x16_dct8_sse2;
          dctf->add8x8_idct     = x264_add8x8_idct_sse2;
          dctf->add16x16_idct   = x264_add16x16_idct_sse2;
          dctf->add8x8_idct8    = x264_add8x8_idct8_sse2;
          dctf->add16x16_idct8    = x264_add16x16_idct8_sse2;
          dctf->sub8x8_dct_dc   = x264_sub8x8_dct_dc_sse2;
          dctf->add8x8_idct_dc  = x264_add8x8_idct_dc_sse2;
          dctf->sub8x16_dct_dc  = x264_sub8x16_dct_dc_sse2;
          dctf->add16x16_idct_dc= x264_add16x16_idct_dc_sse2;
      }
      if( cpu&X264_CPU_SSE4 )
      {
          dctf->sub8x8_dct8     = x264_sub8x8_dct8_sse4;
          dctf->sub16x16_dct8   = x264_sub16x16_dct8_sse4;
      }
      if( cpu&X264_CPU_AVX )
      {
          dctf->add4x4_idct     = x264_add4x4_idct_avx;
          dctf->dct4x4dc        = x264_dct4x4dc_avx;
          dctf->idct4x4dc       = x264_idct4x4dc_avx;
          dctf->sub8x8_dct8     = x264_sub8x8_dct8_avx;
          dctf->sub16x16_dct8   = x264_sub16x16_dct8_avx;
          dctf->add8x8_idct     = x264_add8x8_idct_avx;
          dctf->add16x16_idct   = x264_add16x16_idct_avx;
          dctf->add8x8_idct8    = x264_add8x8_idct8_avx;
          dctf->add16x16_idct8  = x264_add16x16_idct8_avx;
          dctf->add8x8_idct_dc  = x264_add8x8_idct_dc_avx;
          dctf->sub8x16_dct_dc  = x264_sub8x16_dct_dc_avx;
          dctf->add16x16_idct_dc= x264_add16x16_idct_dc_avx;
      }
  #endif // HAVE_MMX
  #else // !HIGH_BIT_DEPTH
  #if HAVE_MMX
      if( cpu&X264_CPU_MMX )
      {
          dctf->sub4x4_dct    = x264_sub4x4_dct_mmx;
          dctf->add4x4_idct   = x264_add4x4_idct_mmx;
          dctf->dct4x4dc      = x264_dct4x4dc_mmx;
          dctf->idct4x4dc     = x264_idct4x4dc_mmx;
          dctf->sub8x8_dct_dc = x264_sub8x8_dct_dc_mmx2;
  
  #if !ARCH_X86_64
          dctf->sub8x8_dct    = x264_sub8x8_dct_mmx;
          dctf->sub16x16_dct  = x264_sub16x16_dct_mmx;
          dctf->add8x8_idct   = x264_add8x8_idct_mmx;
          dctf->add16x16_idct = x264_add16x16_idct_mmx;
  
          dctf->sub8x8_dct8   = x264_sub8x8_dct8_mmx;
          dctf->sub16x16_dct8 = x264_sub16x16_dct8_mmx;
          dctf->add8x8_idct8  = x264_add8x8_idct8_mmx;
          dctf->add16x16_idct8= x264_add16x16_idct8_mmx;
  #endif
      }
  
      if( cpu&X264_CPU_MMX2 )
      {
          dctf->add8x8_idct_dc   = x264_add8x8_idct_dc_mmx2;
          dctf->add16x16_idct_dc = x264_add16x16_idct_dc_mmx2;
      }
  
      if( cpu&X264_CPU_SSE2 )
      {
          dctf->sub8x8_dct8   = x264_sub8x8_dct8_sse2;
          dctf->sub16x16_dct8 = x264_sub16x16_dct8_sse2;
          dctf->sub8x8_dct_dc = x264_sub8x8_dct_dc_sse2;
          dctf->sub8x16_dct_dc= x264_sub8x16_dct_dc_sse2;
          dctf->add8x8_idct8  = x264_add8x8_idct8_sse2;
          dctf->add16x16_idct8= x264_add16x16_idct8_sse2;
  
          if( !(cpu&X264_CPU_SSE2_IS_SLOW) )
          {
              dctf->sub8x8_dct    = x264_sub8x8_dct_sse2;
              dctf->sub16x16_dct  = x264_sub16x16_dct_sse2;
              dctf->add8x8_idct   = x264_add8x8_idct_sse2;
              dctf->add16x16_idct = x264_add16x16_idct_sse2;
              dctf->add16x16_idct_dc = x264_add16x16_idct_dc_sse2;
          }
      }
  
      if( (cpu&X264_CPU_SSSE3) && !(cpu&X264_CPU_SSE2_IS_SLOW) )
      {
          dctf->sub8x16_dct_dc = x264_sub8x16_dct_dc_ssse3;
          if( !(cpu&X264_CPU_SLOW_ATOM) )
          {
              dctf->sub4x4_dct    = x264_sub4x4_dct_ssse3;
              dctf->sub8x8_dct    = x264_sub8x8_dct_ssse3;
              dctf->sub16x16_dct  = x264_sub16x16_dct_ssse3;
              dctf->sub8x8_dct8   = x264_sub8x8_dct8_ssse3;
              dctf->sub16x16_dct8 = x264_sub16x16_dct8_ssse3;
              if( !(cpu&X264_CPU_SLOW_PSHUFB) )
              {
                  dctf->add8x8_idct_dc = x264_add8x8_idct_dc_ssse3;
                  dctf->add16x16_idct_dc = x264_add16x16_idct_dc_ssse3;
              }
          }
      }
  
      if( cpu&X264_CPU_SSE4 )
          dctf->add4x4_idct   = x264_add4x4_idct_sse4;
  
      if( cpu&X264_CPU_AVX )
      {
          dctf->add4x4_idct      = x264_add4x4_idct_avx;
          dctf->add8x8_idct      = x264_add8x8_idct_avx;
          dctf->add16x16_idct    = x264_add16x16_idct_avx;
          dctf->add8x8_idct8     = x264_add8x8_idct8_avx;
          dctf->add16x16_idct8   = x264_add16x16_idct8_avx;
          dctf->add16x16_idct_dc = x264_add16x16_idct_dc_avx;
          dctf->sub8x8_dct       = x264_sub8x8_dct_avx;
          dctf->sub16x16_dct     = x264_sub16x16_dct_avx;
          dctf->sub8x8_dct8      = x264_sub8x8_dct8_avx;
          dctf->sub16x16_dct8    = x264_sub16x16_dct8_avx;
      }
  
      if( cpu&X264_CPU_XOP )
      {
          dctf->sub8x8_dct       = x264_sub8x8_dct_xop;
          dctf->sub16x16_dct     = x264_sub16x16_dct_xop;
      }
  
      if( cpu&X264_CPU_AVX2 )
      {
          dctf->add8x8_idct      = x264_add8x8_idct_avx2;
          dctf->add16x16_idct    = x264_add16x16_idct_avx2;
          dctf->sub8x8_dct       = x264_sub8x8_dct_avx2;
          dctf->sub16x16_dct     = x264_sub16x16_dct_avx2;
          dctf->add16x16_idct_dc = x264_add16x16_idct_dc_avx2;
  #if ARCH_X86_64
          dctf->sub16x16_dct8    = x264_sub16x16_dct8_avx2;
  #endif
      }
  #endif //HAVE_MMX
  
  #if HAVE_ALTIVEC
      if( cpu&X264_CPU_ALTIVEC )
      {
          dctf->sub4x4_dct    = x264_sub4x4_dct_altivec;
          dctf->sub8x8_dct    = x264_sub8x8_dct_altivec;
          dctf->sub16x16_dct  = x264_sub16x16_dct_altivec;
  
          dctf->add4x4_idct   = x264_add4x4_idct_altivec;
          dctf->add8x8_idct   = x264_add8x8_idct_altivec;
          dctf->add16x16_idct = x264_add16x16_idct_altivec;
  
          dctf->sub8x8_dct8   = x264_sub8x8_dct8_altivec;
          dctf->sub16x16_dct8 = x264_sub16x16_dct8_altivec;
  
          dctf->add8x8_idct8  = x264_add8x8_idct8_altivec;
          dctf->add16x16_idct8= x264_add16x16_idct8_altivec;
      }
  #endif
  
  #if HAVE_ARMV6 || ARCH_AARCH64
      if( cpu&X264_CPU_NEON )
      {
          dctf->sub4x4_dct    = x264_sub4x4_dct_neon;
          dctf->sub8x8_dct    = x264_sub8x8_dct_neon;
          dctf->sub16x16_dct  = x264_sub16x16_dct_neon;
          dctf->add8x8_idct_dc = x264_add8x8_idct_dc_neon;
          dctf->add16x16_idct_dc = x264_add16x16_idct_dc_neon;
          dctf->sub8x8_dct_dc = x264_sub8x8_dct_dc_neon;
          dctf->dct4x4dc      = x264_dct4x4dc_neon;
          dctf->idct4x4dc     = x264_idct4x4dc_neon;
  
          dctf->add4x4_idct   = x264_add4x4_idct_neon;
          dctf->add8x8_idct   = x264_add8x8_idct_neon;
          dctf->add16x16_idct = x264_add16x16_idct_neon;
  
          dctf->sub8x8_dct8   = x264_sub8x8_dct8_neon;
          dctf->sub16x16_dct8 = x264_sub16x16_dct8_neon;
  
          dctf->add8x8_idct8  = x264_add8x8_idct8_neon;
          dctf->add16x16_idct8= x264_add16x16_idct8_neon;
      }
  #endif
  #endif // HIGH_BIT_DEPTH
  }
  
  
  #define ZIG(i,y,x) level[i] = dct[x*8+y];
  #define ZIGZAG8_FRAME\
      ZIG( 0,0,0) ZIG( 1,0,1) ZIG( 2,1,0) ZIG( 3,2,0)\
      ZIG( 4,1,1) ZIG( 5,0,2) ZIG( 6,0,3) ZIG( 7,1,2)\
      ZIG( 8,2,1) ZIG( 9,3,0) ZIG(10,4,0) ZIG(11,3,1)\
      ZIG(12,2,2) ZIG(13,1,3) ZIG(14,0,4) ZIG(15,0,5)\
      ZIG(16,1,4) ZIG(17,2,3) ZIG(18,3,2) ZIG(19,4,1)\
      ZIG(20,5,0) ZIG(21,6,0) ZIG(22,5,1) ZIG(23,4,2)\
      ZIG(24,3,3) ZIG(25,2,4) ZIG(26,1,5) ZIG(27,0,6)\
      ZIG(28,0,7) ZIG(29,1,6) ZIG(30,2,5) ZIG(31,3,4)\
      ZIG(32,4,3) ZIG(33,5,2) ZIG(34,6,1) ZIG(35,7,0)\
      ZIG(36,7,1) ZIG(37,6,2) ZIG(38,5,3) ZIG(39,4,4)\
      ZIG(40,3,5) ZIG(41,2,6) ZIG(42,1,7) ZIG(43,2,7)\
      ZIG(44,3,6) ZIG(45,4,5) ZIG(46,5,4) ZIG(47,6,3)\
      ZIG(48,7,2) ZIG(49,7,3) ZIG(50,6,4) ZIG(51,5,5)\
      ZIG(52,4,6) ZIG(53,3,7) ZIG(54,4,7) ZIG(55,5,6)\
      ZIG(56,6,5) ZIG(57,7,4) ZIG(58,7,5) ZIG(59,6,6)\
      ZIG(60,5,7) ZIG(61,6,7) ZIG(62,7,6) ZIG(63,7,7)\
  
  #define ZIGZAG8_FIELD\
      ZIG( 0,0,0) ZIG( 1,1,0) ZIG( 2,2,0) ZIG( 3,0,1)\
      ZIG( 4,1,1) ZIG( 5,3,0) ZIG( 6,4,0) ZIG( 7,2,1)\
      ZIG( 8,0,2) ZIG( 9,3,1) ZIG(10,5,0) ZIG(11,6,0)\
      ZIG(12,7,0) ZIG(13,4,1) ZIG(14,1,2) ZIG(15,0,3)\
      ZIG(16,2,2) ZIG(17,5,1) ZIG(18,6,1) ZIG(19,7,1)\
      ZIG(20,3,2) ZIG(21,1,3) ZIG(22,0,4) ZIG(23,2,3)\
      ZIG(24,4,2) ZIG(25,5,2) ZIG(26,6,2) ZIG(27,7,2)\
      ZIG(28,3,3) ZIG(29,1,4) ZIG(30,0,5) ZIG(31,2,4)\
      ZIG(32,4,3) ZIG(33,5,3) ZIG(34,6,3) ZIG(35,7,3)\
      ZIG(36,3,4) ZIG(37,1,5) ZIG(38,0,6) ZIG(39,2,5)\
      ZIG(40,4,4) ZIG(41,5,4) ZIG(42,6,4) ZIG(43,7,4)\
      ZIG(44,3,5) ZIG(45,1,6) ZIG(46,2,6) ZIG(47,4,5)\
      ZIG(48,5,5) ZIG(49,6,5) ZIG(50,7,5) ZIG(51,3,6)\
      ZIG(52,0,7) ZIG(53,1,7) ZIG(54,4,6) ZIG(55,5,6)\
      ZIG(56,6,6) ZIG(57,7,6) ZIG(58,2,7) ZIG(59,3,7)\
      ZIG(60,4,7) ZIG(61,5,7) ZIG(62,6,7) ZIG(63,7,7)
  
  #define ZIGZAG4_FRAME\
      ZIGDC( 0,0,0) ZIG( 1,0,1) ZIG( 2,1,0) ZIG( 3,2,0)\
      ZIG( 4,1,1) ZIG( 5,0,2) ZIG( 6,0,3) ZIG( 7,1,2)\
      ZIG( 8,2,1) ZIG( 9,3,0) ZIG(10,3,1) ZIG(11,2,2)\
      ZIG(12,1,3) ZIG(13,2,3) ZIG(14,3,2) ZIG(15,3,3)
  
  #define ZIGZAG4_FIELD\
      ZIGDC( 0,0,0) ZIG( 1,1,0) ZIG( 2,0,1) ZIG( 3,2,0)\
      ZIG( 4,3,0) ZIG( 5,1,1) ZIG( 6,2,1) ZIG( 7,3,1)\
      ZIG( 8,0,2) ZIG( 9,1,2) ZIG(10,2,2) ZIG(11,3,2)\
      ZIG(12,0,3) ZIG(13,1,3) ZIG(14,2,3) ZIG(15,3,3)
  
  static void zigzag_scan_8x8_frame( dctcoef level[64], dctcoef dct[64] )
  {
      ZIGZAG8_FRAME
  }
  
  static void zigzag_scan_8x8_field( dctcoef level[64], dctcoef dct[64] )
  {
      ZIGZAG8_FIELD
  }
  
  #undef ZIG
  #define ZIG(i,y,x) level[i] = dct[x*4+y];
  #define ZIGDC(i,y,x) ZIG(i,y,x)
  
  static void zigzag_scan_4x4_frame( dctcoef level[16], dctcoef dct[16] )
  {
      ZIGZAG4_FRAME
  }
  
  static void zigzag_scan_4x4_field( dctcoef level[16], dctcoef dct[16] )
  {
      memcpy( level, dct, 2 * sizeof(dctcoef) );
      ZIG(2,0,1) ZIG(3,2,0) ZIG(4,3,0) ZIG(5,1,1)
      memcpy( level+6, dct+6, 10 * sizeof(dctcoef) );
  }
  
  #undef ZIG
  #define ZIG(i,y,x) {\
      int oe = x+y*FENC_STRIDE;\
      int od = x+y*FDEC_STRIDE;\
      level[i] = p_src[oe] - p_dst[od];\
      nz |= level[i];\
  }
  #define COPY4x4\
      CPPIXEL_X4( p_dst+0*FDEC_STRIDE, p_src+0*FENC_STRIDE );\
      CPPIXEL_X4( p_dst+1*FDEC_STRIDE, p_src+1*FENC_STRIDE );\
      CPPIXEL_X4( p_dst+2*FDEC_STRIDE, p_src+2*FENC_STRIDE );\
      CPPIXEL_X4( p_dst+3*FDEC_STRIDE, p_src+3*FENC_STRIDE );
  #define CPPIXEL_X8(dst,src) ( CPPIXEL_X4(dst,src), CPPIXEL_X4(dst+4,src+4) )
  #define COPY8x8\
      CPPIXEL_X8( p_dst+0*FDEC_STRIDE, p_src+0*FENC_STRIDE );\
      CPPIXEL_X8( p_dst+1*FDEC_STRIDE, p_src+1*FENC_STRIDE );\
      CPPIXEL_X8( p_dst+2*FDEC_STRIDE, p_src+2*FENC_STRIDE );\
      CPPIXEL_X8( p_dst+3*FDEC_STRIDE, p_src+3*FENC_STRIDE );\
      CPPIXEL_X8( p_dst+4*FDEC_STRIDE, p_src+4*FENC_STRIDE );\
      CPPIXEL_X8( p_dst+5*FDEC_STRIDE, p_src+5*FENC_STRIDE );\
      CPPIXEL_X8( p_dst+6*FDEC_STRIDE, p_src+6*FENC_STRIDE );\
      CPPIXEL_X8( p_dst+7*FDEC_STRIDE, p_src+7*FENC_STRIDE );
  
  static int zigzag_sub_4x4_frame( dctcoef level[16], const pixel *p_src, pixel *p_dst )
  {
      int nz = 0;
      ZIGZAG4_FRAME
      COPY4x4
      return !!nz;
  }
  
  static int zigzag_sub_4x4_field( dctcoef level[16], const pixel *p_src, pixel *p_dst )
  {
      int nz = 0;
      ZIGZAG4_FIELD
      COPY4x4
      return !!nz;
  }
  
  #undef ZIGDC
  #define ZIGDC(i,y,x) {\
      int oe = x+y*FENC_STRIDE;\
      int od = x+y*FDEC_STRIDE;\
      *dc = p_src[oe] - p_dst[od];\
      level[0] = 0;\
  }
  
  static int zigzag_sub_4x4ac_frame( dctcoef level[16], const pixel *p_src, pixel *p_dst, dctcoef *dc )
  {
      int nz = 0;
      ZIGZAG4_FRAME
      COPY4x4
      return !!nz;
  }
  
  static int zigzag_sub_4x4ac_field( dctcoef level[16], const pixel *p_src, pixel *p_dst, dctcoef *dc )
  {
      int nz = 0;
      ZIGZAG4_FIELD
      COPY4x4
      return !!nz;
  }
  
  static int zigzag_sub_8x8_frame( dctcoef level[64], const pixel *p_src, pixel *p_dst )
  {
      int nz = 0;
      ZIGZAG8_FRAME
      COPY8x8
      return !!nz;
  }
  static int zigzag_sub_8x8_field( dctcoef level[64], const pixel *p_src, pixel *p_dst )
  {
      int nz = 0;
      ZIGZAG8_FIELD
      COPY8x8
      return !!nz;
  }
  
  #undef ZIG
  #undef COPY4x4
  
  static void zigzag_interleave_8x8_cavlc( dctcoef *dst, dctcoef *src, uint8_t *nnz )
  {
  	int i;
  
  	for( i = 0; i < 4; i++ )
      {
          int nz = 0;
  		int j;
  
  		for( j = 0; j < 16; j++ )
          {
              nz |= src[i+j*4];
              dst[i*16+j] = src[i+j*4];
          }
          nnz[(i&1) + (i>>1)*8] = !!nz;
      }
  }
  
  void x264_zigzag_init( int cpu, x264_zigzag_function_t *pf_progressive, x264_zigzag_function_t *pf_interlaced )
  {
      pf_interlaced->scan_8x8   = zigzag_scan_8x8_field;
      pf_progressive->scan_8x8  = zigzag_scan_8x8_frame;
      pf_interlaced->scan_4x4   = zigzag_scan_4x4_field;
      pf_progressive->scan_4x4  = zigzag_scan_4x4_frame;
      pf_interlaced->sub_8x8    = zigzag_sub_8x8_field;
      pf_progressive->sub_8x8   = zigzag_sub_8x8_frame;
      pf_interlaced->sub_4x4    = zigzag_sub_4x4_field;
      pf_progressive->sub_4x4   = zigzag_sub_4x4_frame;
      pf_interlaced->sub_4x4ac  = zigzag_sub_4x4ac_field;
      pf_progressive->sub_4x4ac = zigzag_sub_4x4ac_frame;
  
  #if HIGH_BIT_DEPTH
  #if HAVE_MMX
      if( cpu&X264_CPU_SSE2 )
      {
          pf_interlaced->scan_4x4  = x264_zigzag_scan_4x4_field_sse2;
          pf_progressive->scan_4x4 = x264_zigzag_scan_4x4_frame_sse2;
          pf_progressive->scan_8x8 = x264_zigzag_scan_8x8_frame_sse2;
      }
      if( cpu&X264_CPU_SSE4 )
          pf_interlaced->scan_8x8 = x264_zigzag_scan_8x8_field_sse4;
      if( cpu&X264_CPU_AVX )
          pf_interlaced->scan_8x8 = x264_zigzag_scan_8x8_field_avx;
  #if ARCH_X86_64
      if( cpu&X264_CPU_AVX )
      {
          pf_progressive->scan_4x4 = x264_zigzag_scan_4x4_frame_avx;
          pf_progressive->scan_8x8 = x264_zigzag_scan_8x8_frame_avx;
      }
  #endif // ARCH_X86_64
  #endif // HAVE_MMX
  #else
  #if HAVE_MMX
      if( cpu&X264_CPU_MMX )
          pf_progressive->scan_4x4 = x264_zigzag_scan_4x4_frame_mmx;
      if( cpu&X264_CPU_MMX2 )
      {
          pf_interlaced->scan_4x4  = x264_zigzag_scan_4x4_field_mmx2;
          pf_interlaced->scan_8x8  = x264_zigzag_scan_8x8_field_mmx2;
          pf_progressive->scan_8x8 = x264_zigzag_scan_8x8_frame_mmx2;
      }
      if( cpu&X264_CPU_SSE2_IS_FAST )
          pf_progressive->scan_8x8 = x264_zigzag_scan_8x8_frame_sse2;
      if( cpu&X264_CPU_SSSE3 )
      {
          pf_interlaced->sub_4x4   = x264_zigzag_sub_4x4_field_ssse3;
          pf_progressive->sub_4x4  = x264_zigzag_sub_4x4_frame_ssse3;
          pf_interlaced->sub_4x4ac = x264_zigzag_sub_4x4ac_field_ssse3;
          pf_progressive->sub_4x4ac= x264_zigzag_sub_4x4ac_frame_ssse3;
          pf_progressive->scan_8x8 = x264_zigzag_scan_8x8_frame_ssse3;
          if( !(cpu&X264_CPU_SLOW_SHUFFLE) )
              pf_progressive->scan_4x4 = x264_zigzag_scan_4x4_frame_ssse3;
      }
      if( cpu&X264_CPU_AVX )
      {
          pf_interlaced->sub_4x4   = x264_zigzag_sub_4x4_field_avx;
          pf_progressive->sub_4x4  = x264_zigzag_sub_4x4_frame_avx;
  #if ARCH_X86_64
          pf_interlaced->sub_4x4ac = x264_zigzag_sub_4x4ac_field_avx;
          pf_progressive->sub_4x4ac= x264_zigzag_sub_4x4ac_frame_avx;
  #endif
          pf_progressive->scan_4x4 = x264_zigzag_scan_4x4_frame_avx;
      }
      if( cpu&X264_CPU_XOP )
      {
          pf_progressive->scan_4x4 = x264_zigzag_scan_4x4_frame_xop;
          pf_progressive->scan_8x8 = x264_zigzag_scan_8x8_frame_xop;
          pf_interlaced->scan_8x8 = x264_zigzag_scan_8x8_field_xop;
      }
  #endif // HAVE_MMX
  #if HAVE_ALTIVEC
      if( cpu&X264_CPU_ALTIVEC )
      {
          pf_interlaced->scan_4x4  = x264_zigzag_scan_4x4_field_altivec;
          pf_progressive->scan_4x4 = x264_zigzag_scan_4x4_frame_altivec;
      }
  #endif
  #if HAVE_ARMV6 || ARCH_AARCH64
      if( cpu&X264_CPU_NEON )
          pf_progressive->scan_4x4 = x264_zigzag_scan_4x4_frame_neon;
  #endif // HAVE_ARMV6 || ARCH_AARCH64
  #endif // HIGH_BIT_DEPTH
  
      pf_interlaced->interleave_8x8_cavlc =
      pf_progressive->interleave_8x8_cavlc = zigzag_interleave_8x8_cavlc;
  #if HAVE_MMX
  #if HIGH_BIT_DEPTH
      if( cpu&X264_CPU_SSE2 )
      {
          pf_interlaced->interleave_8x8_cavlc =
          pf_progressive->interleave_8x8_cavlc = x264_zigzag_interleave_8x8_cavlc_sse2;
      }
      if( cpu&X264_CPU_AVX )
      {
          pf_interlaced->interleave_8x8_cavlc =
          pf_progressive->interleave_8x8_cavlc = x264_zigzag_interleave_8x8_cavlc_avx;
      }
  #else
      if( cpu&X264_CPU_MMX )
      {
          pf_interlaced->interleave_8x8_cavlc =
          pf_progressive->interleave_8x8_cavlc = x264_zigzag_interleave_8x8_cavlc_mmx;
      }
      if( (cpu&X264_CPU_SSE2) && !(cpu&(X264_CPU_SLOW_SHUFFLE|X264_CPU_SSE2_IS_SLOW)) )
      {
          pf_interlaced->interleave_8x8_cavlc =
          pf_progressive->interleave_8x8_cavlc = x264_zigzag_interleave_8x8_cavlc_sse2;
      }
  
      if( cpu&X264_CPU_AVX )
      {
          pf_interlaced->interleave_8x8_cavlc =
          pf_progressive->interleave_8x8_cavlc = x264_zigzag_interleave_8x8_cavlc_avx;
      }
  
      if( cpu&X264_CPU_AVX2 )
      {
          pf_interlaced->interleave_8x8_cavlc =
          pf_progressive->interleave_8x8_cavlc = x264_zigzag_interleave_8x8_cavlc_avx2;
      }
  #endif // HIGH_BIT_DEPTH
  #endif
  }
  