text: /*
   * idct_mmx.c
   * Copyright (C) 1999-2001 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
   *
   * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
   * See http://libmpeg2.sourceforge.net/ for updates.
   *
   * mpeg2dec 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.
   *
   * mpeg2dec 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 mpeg2dec; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #include "libavutil/common.h"
  #include "libavcodec/dsputil.h"
  
  #include "dsputil_mmx.h"
  #include "mmx.h"
  
  #define ROW_SHIFT 11
  #define COL_SHIFT 6
  
  #define round(bias) ((int)(((bias)+0.5) * (1<<ROW_SHIFT)))
  #define rounder(bias) {round (bias), round (bias)}
  
  
  #if 0
  /* C row IDCT - it is just here to document the MMXEXT and MMX versions */
  static inline void idct_row (int16_t * row, int offset,
                               int16_t * table, int32_t * rounder)
  {
      int C1, C2, C3, C4, C5, C6, C7;
      int a0, a1, a2, a3, b0, b1, b2, b3;
  
      row += offset;
  
      C1 = table[1];
      C2 = table[2];
      C3 = table[3];
      C4 = table[4];
      C5 = table[5];
      C6 = table[6];
      C7 = table[7];
  
      a0 = C4*row[0] + C2*row[2] + C4*row[4] + C6*row[6] + *rounder;
      a1 = C4*row[0] + C6*row[2] - C4*row[4] - C2*row[6] + *rounder;
      a2 = C4*row[0] - C6*row[2] - C4*row[4] + C2*row[6] + *rounder;
      a3 = C4*row[0] - C2*row[2] + C4*row[4] - C6*row[6] + *rounder;
  
      b0 = C1*row[1] + C3*row[3] + C5*row[5] + C7*row[7];
      b1 = C3*row[1] - C7*row[3] - C1*row[5] - C5*row[7];
      b2 = C5*row[1] - C1*row[3] + C7*row[5] + C3*row[7];
      b3 = C7*row[1] - C5*row[3] + C3*row[5] - C1*row[7];
  
      row[0] = (a0 + b0) >> ROW_SHIFT;
      row[1] = (a1 + b1) >> ROW_SHIFT;
      row[2] = (a2 + b2) >> ROW_SHIFT;
      row[3] = (a3 + b3) >> ROW_SHIFT;
      row[4] = (a3 - b3) >> ROW_SHIFT;
      row[5] = (a2 - b2) >> ROW_SHIFT;
      row[6] = (a1 - b1) >> ROW_SHIFT;
      row[7] = (a0 - b0) >> ROW_SHIFT;
  }
  #endif
  
  
  /* MMXEXT row IDCT */
  
  #define mmxext_table(c1,c2,c3,c4,c5,c6,c7)      {  c4,  c2, -c4, -c2,   \
                                                     c4,  c6,  c4,  c6,   \
                                                     c1,  c3, -c1, -c5,   \
                                                     c5,  c7,  c3, -c7,   \
                                                     c4, -c6,  c4, -c6,   \
                                                    -c4,  c2,  c4, -c2,   \
                                                     c5, -c1,  c3, -c1,   \
                                                     c7,  c3,  c7, -c5 }
  
  static inline void mmxext_row_head (int16_t * const row, const int offset,
                                      const int16_t * const table)
  {
      movq_m2r (*(row+offset), mm2);      /* mm2 = x6 x4 x2 x0 */
  
      movq_m2r (*(row+offset+4), mm5);    /* mm5 = x7 x5 x3 x1 */
      movq_r2r (mm2, mm0);                /* mm0 = x6 x4 x2 x0 */
  
      movq_m2r (*table, mm3);             /* mm3 = -C2 -C4 C2 C4 */
      movq_r2r (mm5, mm6);                /* mm6 = x7 x5 x3 x1 */
  
      movq_m2r (*(table+4), mm4);         /* mm4 = C6 C4 C6 C4 */
      pmaddwd_r2r (mm0, mm3);             /* mm3 = -C4*x4-C2*x6 C4*x0+C2*x2 */
  
      pshufw_r2r (mm2, mm2, 0x4e);        /* mm2 = x2 x0 x6 x4 */
  }
  
  static inline void mmxext_row (const int16_t * const table,
                                 const int32_t * const rounder)
  {
      movq_m2r (*(table+8), mm1);         /* mm1 = -C5 -C1 C3 C1 */
      pmaddwd_r2r (mm2, mm4);             /* mm4 = C4*x0+C6*x2 C4*x4+C6*x6 */
  
      pmaddwd_m2r (*(table+16), mm0);     /* mm0 = C4*x4-C6*x6 C4*x0-C6*x2 */
      pshufw_r2r (mm6, mm6, 0x4e);        /* mm6 = x3 x1 x7 x5 */
  
      movq_m2r (*(table+12), mm7);        /* mm7 = -C7 C3 C7 C5 */
      pmaddwd_r2r (mm5, mm1);             /* mm1 = -C1*x5-C5*x7 C1*x1+C3*x3 */
  
      paddd_m2r (*rounder, mm3);          /* mm3 += rounder */
      pmaddwd_r2r (mm6, mm7);             /* mm7 = C3*x1-C7*x3 C5*x5+C7*x7 */
  
      pmaddwd_m2r (*(table+20), mm2);     /* mm2 = C4*x0-C2*x2 -C4*x4+C2*x6 */
      paddd_r2r (mm4, mm3);               /* mm3 = a1 a0 + rounder */
  
      pmaddwd_m2r (*(table+24), mm5);     /* mm5 = C3*x5-C1*x7 C5*x1-C1*x3 */
      movq_r2r (mm3, mm4);                /* mm4 = a1 a0 + rounder */
  
      pmaddwd_m2r (*(table+28), mm6);     /* mm6 = C7*x1-C5*x3 C7*x5+C3*x7 */
      paddd_r2r (mm7, mm1);               /* mm1 = b1 b0 */
  
      paddd_m2r (*rounder, mm0);          /* mm0 += rounder */
      psubd_r2r (mm1, mm3);               /* mm3 = a1-b1 a0-b0 + rounder */
  
      psrad_i2r (ROW_SHIFT, mm3);         /* mm3 = y6 y7 */
      paddd_r2r (mm4, mm1);               /* mm1 = a1+b1 a0+b0 + rounder */
  
      paddd_r2r (mm2, mm0);               /* mm0 = a3 a2 + rounder */
      psrad_i2r (ROW_SHIFT, mm1);         /* mm1 = y1 y0 */
  
      paddd_r2r (mm6, mm5);               /* mm5 = b3 b2 */
      movq_r2r (mm0, mm4);                /* mm4 = a3 a2 + rounder */
  
      paddd_r2r (mm5, mm0);               /* mm0 = a3+b3 a2+b2 + rounder */
      psubd_r2r (mm5, mm4);               /* mm4 = a3-b3 a2-b2 + rounder */
  }
  
  static inline void mmxext_row_tail (int16_t * const row, const int store)
  {
      psrad_i2r (ROW_SHIFT, mm0);         /* mm0 = y3 y2 */
  
      psrad_i2r (ROW_SHIFT, mm4);         /* mm4 = y4 y5 */
  
      packssdw_r2r (mm0, mm1);            /* mm1 = y3 y2 y1 y0 */
  
      packssdw_r2r (mm3, mm4);            /* mm4 = y6 y7 y4 y5 */
  
      movq_r2m (mm1, *(row+store));       /* save y3 y2 y1 y0 */
      pshufw_r2r (mm4, mm4, 0xb1);        /* mm4 = y7 y6 y5 y4 */
  
      /* slot */
  
      movq_r2m (mm4, *(row+store+4));     /* save y7 y6 y5 y4 */
  }
  
  static inline void mmxext_row_mid (int16_t * const row, const int store,
                                     const int offset,
                                     const int16_t * const table)
  {
      movq_m2r (*(row+offset), mm2);      /* mm2 = x6 x4 x2 x0 */
      psrad_i2r (ROW_SHIFT, mm0);         /* mm0 = y3 y2 */
  
      movq_m2r (*(row+offset+4), mm5);    /* mm5 = x7 x5 x3 x1 */
      psrad_i2r (ROW_SHIFT, mm4);         /* mm4 = y4 y5 */
  
      packssdw_r2r (mm0, mm1);            /* mm1 = y3 y2 y1 y0 */
      movq_r2r (mm5, mm6);                /* mm6 = x7 x5 x3 x1 */
  
      packssdw_r2r (mm3, mm4);            /* mm4 = y6 y7 y4 y5 */
      movq_r2r (mm2, mm0);                /* mm0 = x6 x4 x2 x0 */
  
      movq_r2m (mm1, *(row+store));       /* save y3 y2 y1 y0 */
      pshufw_r2r (mm4, mm4, 0xb1);        /* mm4 = y7 y6 y5 y4 */
  
      movq_m2r (*table, mm3);             /* mm3 = -C2 -C4 C2 C4 */
      movq_r2m (mm4, *(row+store+4));     /* save y7 y6 y5 y4 */
  
      pmaddwd_r2r (mm0, mm3);             /* mm3 = -C4*x4-C2*x6 C4*x0+C2*x2 */
  
      movq_m2r (*(table+4), mm4);         /* mm4 = C6 C4 C6 C4 */
      pshufw_r2r (mm2, mm2, 0x4e);        /* mm2 = x2 x0 x6 x4 */
  }
  
  
  /* MMX row IDCT */
  
  #define mmx_table(c1,c2,c3,c4,c5,c6,c7) {  c4,  c2,  c4,  c6,   \
                                             c4,  c6, -c4, -c2,   \
                                             c1,  c3,  c3, -c7,   \
                                             c5,  c7, -c1, -c5,   \
                                             c4, -c6,  c4, -c2,   \
                                            -c4,  c2,  c4, -c6,   \
                                             c5, -c1,  c7, -c5,   \
                                             c7,  c3,  c3, -c1 }
  
  static inline void mmx_row_head (int16_t * const row, const int offset,
                                   const int16_t * const table)
  {
      movq_m2r (*(row+offset), mm2);      /* mm2 = x6 x4 x2 x0 */
  
      movq_m2r (*(row+offset+4), mm5);    /* mm5 = x7 x5 x3 x1 */
      movq_r2r (mm2, mm0);                /* mm0 = x6 x4 x2 x0 */
  
      movq_m2r (*table, mm3);             /* mm3 = C6 C4 C2 C4 */
      movq_r2r (mm5, mm6);                /* mm6 = x7 x5 x3 x1 */
  
      punpckldq_r2r (mm0, mm0);           /* mm0 = x2 x0 x2 x0 */
  
      movq_m2r (*(table+4), mm4);         /* mm4 = -C2 -C4 C6 C4 */
      pmaddwd_r2r (mm0, mm3);             /* mm3 = C4*x0+C6*x2 C4*x0+C2*x2 */
  
      movq_m2r (*(table+8), mm1);         /* mm1 = -C7 C3 C3 C1 */
      punpckhdq_r2r (mm2, mm2);           /* mm2 = x6 x4 x6 x4 */
  }
  
  static inline void mmx_row (const int16_t * const table,
                              const int32_t * const rounder)
  {
      pmaddwd_r2r (mm2, mm4);             /* mm4 = -C4*x4-C2*x6 C4*x4+C6*x6 */
      punpckldq_r2r (mm5, mm5);           /* mm5 = x3 x1 x3 x1 */
  
      pmaddwd_m2r (*(table+16), mm0);     /* mm0 = C4*x0-C2*x2 C4*x0-C6*x2 */
      punpckhdq_r2r (mm6, mm6);           /* mm6 = x7 x5 x7 x5 */
  
      movq_m2r (*(table+12), mm7);        /* mm7 = -C5 -C1 C7 C5 */
      pmaddwd_r2r (mm5, mm1);             /* mm1 = C3*x1-C7*x3 C1*x1+C3*x3 */
  
      paddd_m2r (*rounder, mm3);          /* mm3 += rounder */
      pmaddwd_r2r (mm6, mm7);             /* mm7 = -C1*x5-C5*x7 C5*x5+C7*x7 */
  
      pmaddwd_m2r (*(table+20), mm2);     /* mm2 = C4*x4-C6*x6 -C4*x4+C2*x6 */
      paddd_r2r (mm4, mm3);               /* mm3 = a1 a0 + rounder */
  
      pmaddwd_m2r (*(table+24), mm5);     /* mm5 = C7*x1-C5*x3 C5*x1-C1*x3 */
      movq_r2r (mm3, mm4);                /* mm4 = a1 a0 + rounder */
  
      pmaddwd_m2r (*(table+28), mm6);     /* mm6 = C3*x5-C1*x7 C7*x5+C3*x7 */
      paddd_r2r (mm7, mm1);               /* mm1 = b1 b0 */
  
      paddd_m2r (*rounder, mm0);          /* mm0 += rounder */
      psubd_r2r (mm1, mm3);               /* mm3 = a1-b1 a0-b0 + rounder */
  
      psrad_i2r (ROW_SHIFT, mm3);         /* mm3 = y6 y7 */
      paddd_r2r (mm4, mm1);               /* mm1 = a1+b1 a0+b0 + rounder */
  
      paddd_r2r (mm2, mm0);               /* mm0 = a3 a2 + rounder */
      psrad_i2r (ROW_SHIFT, mm1);         /* mm1 = y1 y0 */
  
      paddd_r2r (mm6, mm5);               /* mm5 = b3 b2 */
      movq_r2r (mm0, mm7);                /* mm7 = a3 a2 + rounder */
  
      paddd_r2r (mm5, mm0);               /* mm0 = a3+b3 a2+b2 + rounder */
      psubd_r2r (mm5, mm7);               /* mm7 = a3-b3 a2-b2 + rounder */
  }
  
  static inline void mmx_row_tail (int16_t * const row, const int store)
  {
      psrad_i2r (ROW_SHIFT, mm0);         /* mm0 = y3 y2 */
  
      psrad_i2r (ROW_SHIFT, mm7);         /* mm7 = y4 y5 */
  
      packssdw_r2r (mm0, mm1);            /* mm1 = y3 y2 y1 y0 */
  
      packssdw_r2r (mm3, mm7);            /* mm7 = y6 y7 y4 y5 */
  
      movq_r2m (mm1, *(row+store));       /* save y3 y2 y1 y0 */
      movq_r2r (mm7, mm4);                /* mm4 = y6 y7 y4 y5 */
  
      pslld_i2r (16, mm7);                /* mm7 = y7 0 y5 0 */
  
      psrld_i2r (16, mm4);                /* mm4 = 0 y6 0 y4 */
  
      por_r2r (mm4, mm7);                 /* mm7 = y7 y6 y5 y4 */
  
      /* slot */
  
      movq_r2m (mm7, *(row+store+4));     /* save y7 y6 y5 y4 */
  }
  
  static inline void mmx_row_mid (int16_t * const row, const int store,
                                  const int offset, const int16_t * const table)
  {
      movq_m2r (*(row+offset), mm2);      /* mm2 = x6 x4 x2 x0 */
      psrad_i2r (ROW_SHIFT, mm0);         /* mm0 = y3 y2 */
  
      movq_m2r (*(row+offset+4), mm5);    /* mm5 = x7 x5 x3 x1 */
      psrad_i2r (ROW_SHIFT, mm7);         /* mm7 = y4 y5 */
  
      packssdw_r2r (mm0, mm1);            /* mm1 = y3 y2 y1 y0 */
      movq_r2r (mm5, mm6);                /* mm6 = x7 x5 x3 x1 */
  
      packssdw_r2r (mm3, mm7);            /* mm7 = y6 y7 y4 y5 */
      movq_r2r (mm2, mm0);                /* mm0 = x6 x4 x2 x0 */
  
      movq_r2m (mm1, *(row+store));       /* save y3 y2 y1 y0 */
      movq_r2r (mm7, mm1);                /* mm1 = y6 y7 y4 y5 */
  
      punpckldq_r2r (mm0, mm0);           /* mm0 = x2 x0 x2 x0 */
      psrld_i2r (16, mm7);                /* mm7 = 0 y6 0 y4 */
  
      movq_m2r (*table, mm3);             /* mm3 = C6 C4 C2 C4 */
      pslld_i2r (16, mm1);                /* mm1 = y7 0 y5 0 */
  
      movq_m2r (*(table+4), mm4);         /* mm4 = -C2 -C4 C6 C4 */
      por_r2r (mm1, mm7);                 /* mm7 = y7 y6 y5 y4 */
  
      movq_m2r (*(table+8), mm1);         /* mm1 = -C7 C3 C3 C1 */
      punpckhdq_r2r (mm2, mm2);           /* mm2 = x6 x4 x6 x4 */
  
      movq_r2m (mm7, *(row+store+4));     /* save y7 y6 y5 y4 */
      pmaddwd_r2r (mm0, mm3);             /* mm3 = C4*x0+C6*x2 C4*x0+C2*x2 */
  }
  
  
  #if 0
  /* C column IDCT - it is just here to document the MMXEXT and MMX versions */
  static inline void idct_col (int16_t * col, int offset)
  {
  /* multiplication - as implemented on mmx */
  #define F(c,x) (((c) * (x)) >> 16)
  
  /* saturation - it helps us handle torture test cases */
  #define S(x) (((x)>32767) ? 32767 : ((x)<-32768) ? -32768 : (x))
  
      int16_t x0, x1, x2, x3, x4, x5, x6, x7;
      int16_t y0, y1, y2, y3, y4, y5, y6, y7;
      int16_t a0, a1, a2, a3, b0, b1, b2, b3;
      int16_t u04, v04, u26, v26, u17, v17, u35, v35, u12, v12;
  
      col += offset;
  
      x0 = col[0*8];
      x1 = col[1*8];
      x2 = col[2*8];
      x3 = col[3*8];
      x4 = col[4*8];
      x5 = col[5*8];
      x6 = col[6*8];
      x7 = col[7*8];
  
      u04 = S (x0 + x4);
      v04 = S (x0 - x4);
      u26 = S (F (T2, x6) + x2);
      v26 = S (F (T2, x2) - x6);
  
      a0 = S (u04 + u26);
      a1 = S (v04 + v26);
      a2 = S (v04 - v26);
      a3 = S (u04 - u26);
  
      u17 = S (F (T1, x7) + x1);
      v17 = S (F (T1, x1) - x7);
      u35 = S (F (T3, x5) + x3);
      v35 = S (F (T3, x3) - x5);
  
      b0 = S (u17 + u35);
      b3 = S (v17 - v35);
      u12 = S (u17 - u35);
      v12 = S (v17 + v35);
      u12 = S (2 * F (C4, u12));
      v12 = S (2 * F (C4, v12));
      b1 = S (u12 + v12);
      b2 = S (u12 - v12);
  
      y0 = S (a0 + b0) >> COL_SHIFT;
      y1 = S (a1 + b1) >> COL_SHIFT;
      y2 = S (a2 + b2) >> COL_SHIFT;
      y3 = S (a3 + b3) >> COL_SHIFT;
  
      y4 = S (a3 - b3) >> COL_SHIFT;
      y5 = S (a2 - b2) >> COL_SHIFT;
      y6 = S (a1 - b1) >> COL_SHIFT;
      y7 = S (a0 - b0) >> COL_SHIFT;
  
      col[0*8] = y0;
      col[1*8] = y1;
      col[2*8] = y2;
      col[3*8] = y3;
      col[4*8] = y4;
      col[5*8] = y5;
      col[6*8] = y6;
      col[7*8] = y7;
  }
  #endif
  
  
  /* MMX column IDCT */
  static inline void idct_col (int16_t * const col, const int offset)
  {
  #define T1 13036
  #define T2 27146
  #define T3 43790
  #define C4 23170
  
      DECLARE_ALIGNED(8, static const short, t1_vector)[] = {T1,T1,T1,T1};
      DECLARE_ALIGNED(8, static const short, t2_vector)[] = {T2,T2,T2,T2};
      DECLARE_ALIGNED(8, static const short, t3_vector)[] = {T3,T3,T3,T3};
      DECLARE_ALIGNED(8, static const short, c4_vector)[] = {C4,C4,C4,C4};
  
      /* column code adapted from Peter Gubanov */
      /* http://www.elecard.com/peter/idct.shtml */
  
      movq_m2r (*t1_vector, mm0);         /* mm0 = T1 */
  
      movq_m2r (*(col+offset+1*8), mm1);  /* mm1 = x1 */
      movq_r2r (mm0, mm2);                /* mm2 = T1 */
  
      movq_m2r (*(col+offset+7*8), mm4);  /* mm4 = x7 */
      pmulhw_r2r (mm1, mm0);              /* mm0 = T1*x1 */
  
      movq_m2r (*t3_vector, mm5);         /* mm5 = T3 */
      pmulhw_r2r (mm4, mm2);              /* mm2 = T1*x7 */
  
      movq_m2r (*(col+offset+5*8), mm6);  /* mm6 = x5 */
      movq_r2r (mm5, mm7);                /* mm7 = T3-1 */
  
      movq_m2r (*(col+offset+3*8), mm3);  /* mm3 = x3 */
      psubsw_r2r (mm4, mm0);              /* mm0 = v17 */
  
      movq_m2r (*t2_vector, mm4);         /* mm4 = T2 */
      pmulhw_r2r (mm3, mm5);              /* mm5 = (T3-1)*x3 */
  
      paddsw_r2r (mm2, mm1);              /* mm1 = u17 */
      pmulhw_r2r (mm6, mm7);              /* mm7 = (T3-1)*x5 */
  
      /* slot */
  
      movq_r2r (mm4, mm2);                /* mm2 = T2 */
      paddsw_r2r (mm3, mm5);              /* mm5 = T3*x3 */
  
      pmulhw_m2r (*(col+offset+2*8), mm4);/* mm4 = T2*x2 */
      paddsw_r2r (mm6, mm7);              /* mm7 = T3*x5 */
  
      psubsw_r2r (mm6, mm5);              /* mm5 = v35 */
      paddsw_r2r (mm3, mm7);              /* mm7 = u35 */
  
      movq_m2r (*(col+offset+6*8), mm3);  /* mm3 = x6 */
      movq_r2r (mm0, mm6);                /* mm6 = v17 */
  
      pmulhw_r2r (mm3, mm2);              /* mm2 = T2*x6 */
      psubsw_r2r (mm5, mm0);              /* mm0 = b3 */
  
      psubsw_r2r (mm3, mm4);              /* mm4 = v26 */
      paddsw_r2r (mm6, mm5);              /* mm5 = v12 */
  
      movq_r2m (mm0, *(col+offset+3*8));  /* save b3 in scratch0 */
      movq_r2r (mm1, mm6);                /* mm6 = u17 */
  
      paddsw_m2r (*(col+offset+2*8), mm2);/* mm2 = u26 */
      paddsw_r2r (mm7, mm6);              /* mm6 = b0 */
  
      psubsw_r2r (mm7, mm1);              /* mm1 = u12 */
      movq_r2r (mm1, mm7);                /* mm7 = u12 */
  
      movq_m2r (*(col+offset+0*8), mm3);  /* mm3 = x0 */
      paddsw_r2r (mm5, mm1);              /* mm1 = u12+v12 */
  
      movq_m2r (*c4_vector, mm0);         /* mm0 = C4/2 */
      psubsw_r2r (mm5, mm7);              /* mm7 = u12-v12 */
  
      movq_r2m (mm6, *(col+offset+5*8));  /* save b0 in scratch1 */
      pmulhw_r2r (mm0, mm1);              /* mm1 = b1/2 */
  
      movq_r2r (mm4, mm6);                /* mm6 = v26 */
      pmulhw_r2r (mm0, mm7);              /* mm7 = b2/2 */
  
      movq_m2r (*(col+offset+4*8), mm5);  /* mm5 = x4 */
      movq_r2r (mm3, mm0);                /* mm0 = x0 */
  
      psubsw_r2r (mm5, mm3);              /* mm3 = v04 */
      paddsw_r2r (mm5, mm0);              /* mm0 = u04 */
  
      paddsw_r2r (mm3, mm4);              /* mm4 = a1 */
      movq_r2r (mm0, mm5);                /* mm5 = u04 */
  
      psubsw_r2r (mm6, mm3);              /* mm3 = a2 */
      paddsw_r2r (mm2, mm5);              /* mm5 = a0 */
  
      paddsw_r2r (mm1, mm1);              /* mm1 = b1 */
      psubsw_r2r (mm2, mm0);              /* mm0 = a3 */
  
      paddsw_r2r (mm7, mm7);              /* mm7 = b2 */
      movq_r2r (mm3, mm2);                /* mm2 = a2 */
  
      movq_r2r (mm4, mm6);                /* mm6 = a1 */
      paddsw_r2r (mm7, mm3);              /* mm3 = a2+b2 */
  
      psraw_i2r (COL_SHIFT, mm3);         /* mm3 = y2 */
      paddsw_r2r (mm1, mm4);              /* mm4 = a1+b1 */
  
      psraw_i2r (COL_SHIFT, mm4);         /* mm4 = y1 */
      psubsw_r2r (mm1, mm6);              /* mm6 = a1-b1 */
  
      movq_m2r (*(col+offset+5*8), mm1);  /* mm1 = b0 */
      psubsw_r2r (mm7, mm2);              /* mm2 = a2-b2 */
  
      psraw_i2r (COL_SHIFT, mm6);         /* mm6 = y6 */
      movq_r2r (mm5, mm7);                /* mm7 = a0 */
  
      movq_r2m (mm4, *(col+offset+1*8));  /* save y1 */
      psraw_i2r (COL_SHIFT, mm2);         /* mm2 = y5 */
  
      movq_r2m (mm3, *(col+offset+2*8));  /* save y2 */
      paddsw_r2r (mm1, mm5);              /* mm5 = a0+b0 */
  
      movq_m2r (*(col+offset+3*8), mm4);  /* mm4 = b3 */
      psubsw_r2r (mm1, mm7);              /* mm7 = a0-b0 */
  
      psraw_i2r (COL_SHIFT, mm5);         /* mm5 = y0 */
      movq_r2r (mm0, mm3);                /* mm3 = a3 */
  
      movq_r2m (mm2, *(col+offset+5*8));  /* save y5 */
      psubsw_r2r (mm4, mm3);              /* mm3 = a3-b3 */
  
      psraw_i2r (COL_SHIFT, mm7);         /* mm7 = y7 */
      paddsw_r2r (mm0, mm4);              /* mm4 = a3+b3 */
  
      movq_r2m (mm5, *(col+offset+0*8));  /* save y0 */
      psraw_i2r (COL_SHIFT, mm3);         /* mm3 = y4 */
  
      movq_r2m (mm6, *(col+offset+6*8));  /* save y6 */
      psraw_i2r (COL_SHIFT, mm4);         /* mm4 = y3 */
  
      movq_r2m (mm7, *(col+offset+7*8));  /* save y7 */
  
      movq_r2m (mm3, *(col+offset+4*8));  /* save y4 */
  
      movq_r2m (mm4, *(col+offset+3*8));  /* save y3 */
  
  #undef T1
  #undef T2
  #undef T3
  #undef C4
  }
  
  
  DECLARE_ALIGNED(8, static const int32_t, rounder0)[] =
      rounder ((1 << (COL_SHIFT - 1)) - 0.5);
  DECLARE_ALIGNED(8, static const int32_t, rounder4)[] = rounder (0);
  DECLARE_ALIGNED(8, static const int32_t, rounder1)[] =
      rounder (1.25683487303);        /* C1*(C1/C4+C1+C7)/2 */
  DECLARE_ALIGNED(8, static const int32_t, rounder7)[] =
      rounder (-0.25);                /* C1*(C7/C4+C7-C1)/2 */
  DECLARE_ALIGNED(8, static const int32_t, rounder2)[] =
      rounder (0.60355339059);        /* C2 * (C6+C2)/2 */
  DECLARE_ALIGNED(8, static const int32_t, rounder6)[] =
      rounder (-0.25);                /* C2 * (C6-C2)/2 */
  DECLARE_ALIGNED(8, static const int32_t, rounder3)[] =
      rounder (0.087788325588);       /* C3*(-C3/C4+C3+C5)/2 */
  DECLARE_ALIGNED(8, static const int32_t, rounder5)[] =
      rounder (-0.441341716183);      /* C3*(-C5/C4+C5-C3)/2 */
  
  #undef COL_SHIFT
  #undef ROW_SHIFT
  
  #define declare_idct(idct,table,idct_row_head,idct_row,idct_row_tail,idct_row_mid) \
  void idct (int16_t * const block)                                       \
  {                                                                       \
      DECLARE_ALIGNED(16, static const int16_t, table04)[] =              \
          table (22725, 21407, 19266, 16384, 12873,  8867, 4520);         \
      DECLARE_ALIGNED(16, static const int16_t, table17)[] =              \
          table (31521, 29692, 26722, 22725, 17855, 12299, 6270);         \
      DECLARE_ALIGNED(16, static const int16_t, table26)[] =              \
          table (29692, 27969, 25172, 21407, 16819, 11585, 5906);         \
      DECLARE_ALIGNED(16, static const int16_t, table35)[] =              \
          table (26722, 25172, 22654, 19266, 15137, 10426, 5315);         \
                                                                          \
      idct_row_head (block, 0*8, table04);                                \
      idct_row (table04, rounder0);                                       \
      idct_row_mid (block, 0*8, 4*8, table04);                            \
      idct_row (table04, rounder4);                                       \
      idct_row_mid (block, 4*8, 1*8, table17);                            \
      idct_row (table17, rounder1);                                       \
      idct_row_mid (block, 1*8, 7*8, table17);                            \
      idct_row (table17, rounder7);                                       \
      idct_row_mid (block, 7*8, 2*8, table26);                            \
      idct_row (table26, rounder2);                                       \
      idct_row_mid (block, 2*8, 6*8, table26);                            \
      idct_row (table26, rounder6);                                       \
      idct_row_mid (block, 6*8, 3*8, table35);                            \
      idct_row (table35, rounder3);                                       \
      idct_row_mid (block, 3*8, 5*8, table35);                            \
      idct_row (table35, rounder5);                                       \
      idct_row_tail (block, 5*8);                                         \
                                                                          \
      idct_col (block, 0);                                                \
      idct_col (block, 4);                                                \
  }
  
  declare_idct (ff_mmxext_idct, mmxext_table,
                mmxext_row_head, mmxext_row, mmxext_row_tail, mmxext_row_mid)
  
  declare_idct (ff_mmx_idct, mmx_table,
                mmx_row_head, mmx_row, mmx_row_tail, mmx_row_mid)
  
  