git.sesse.net Git - ffmpeg/blob - libavcodec/ppc/idct_altivec.c

   1 /*
   2  * Copyright (c) 2001 Michel Lespinasse
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  *
  18  */
  19
  20 /*
  21  * NOTE: This code is based on GPL code from the libmpeg2 project.  The
  22  * author, Michel Lespinasses, has given explicit permission to release
  23  * under LGPL as part of ffmpeg.
  24  *
  25  */
  26
  27 /*
  28  * FFMpeg integration by Dieter Shirley
  29  *
  30  * This file is a direct copy of the altivec idct module from the libmpeg2
  31  * project.  I've deleted all of the libmpeg2 specific code, renamed the functions and
  32  * re-ordered the function parameters.  The only change to the IDCT function
  33  * itself was to factor out the partial transposition, and to perform a full
  34  * transpose at the end of the function.
  35  */
  36
  37
  38 #include <stdlib.h>                                      /* malloc(), free() */
  39 #include <string.h>
  40 #include "../dsputil.h"
  41
  42 #define vector_s16_t vector signed short
  43 #define vector_u16_t vector unsigned short
  44 #define vector_s8_t vector signed char
  45 #define vector_u8_t vector unsigned char
  46 #define vector_s32_t vector signed int
  47 #define vector_u32_t vector unsigned int
  48
  49 #define IDCT_HALF                                       \
  50     /* 1st stage */                                     \
  51     t1 = vec_mradds (a1, vx7, vx1 );                    \
  52     t8 = vec_mradds (a1, vx1, vec_subs (zero, vx7));    \
  53     t7 = vec_mradds (a2, vx5, vx3);                     \
  54     t3 = vec_mradds (ma2, vx3, vx5);                    \
  55                                                         \
  56     /* 2nd stage */                                     \
  57     t5 = vec_adds (vx0, vx4);                           \
  58     t0 = vec_subs (vx0, vx4);                           \
  59     t2 = vec_mradds (a0, vx6, vx2);                     \
  60     t4 = vec_mradds (a0, vx2, vec_subs (zero, vx6));    \
  61     t6 = vec_adds (t8, t3);                             \
  62     t3 = vec_subs (t8, t3);                             \
  63     t8 = vec_subs (t1, t7);                             \
  64     t1 = vec_adds (t1, t7);                             \
  65                                                         \
  66     /* 3rd stage */                                     \
  67     t7 = vec_adds (t5, t2);                             \
  68     t2 = vec_subs (t5, t2);                             \
  69     t5 = vec_adds (t0, t4);                             \
  70     t0 = vec_subs (t0, t4);                             \
  71     t4 = vec_subs (t8, t3);                             \
  72     t3 = vec_adds (t8, t3);                             \
  73                                                         \
  74     /* 4th stage */                                     \
  75     vy0 = vec_adds (t7, t1);                            \
  76     vy7 = vec_subs (t7, t1);                            \
  77     vy1 = vec_mradds (c4, t3, t5);                      \
  78     vy6 = vec_mradds (mc4, t3, t5);                     \
  79     vy2 = vec_mradds (c4, t4, t0);                      \
  80     vy5 = vec_mradds (mc4, t4, t0);                     \
  81     vy3 = vec_adds (t2, t6);                            \
  82     vy4 = vec_subs (t2, t6);
  83
  84
  85 #define IDCT                                                            \
  86     vector_s16_t vx0, vx1, vx2, vx3, vx4, vx5, vx6, vx7;                \
  87     vector_s16_t vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7;                \
  88     vector_s16_t a0, a1, a2, ma2, c4, mc4, zero, bias;                  \
  89     vector_s16_t t0, t1, t2, t3, t4, t5, t6, t7, t8;                    \
  90     vector_u16_t shift;                                                 \
  91                                                                         \
  92     c4 = vec_splat (constants[0], 0);                                   \
  93     a0 = vec_splat (constants[0], 1);                                   \
  94     a1 = vec_splat (constants[0], 2);                                   \
  95     a2 = vec_splat (constants[0], 3);                                   \
  96     mc4 = vec_splat (constants[0], 4);                                  \
  97     ma2 = vec_splat (constants[0], 5);                                  \
  98     bias = (vector_s16_t)vec_splat ((vector_s32_t)constants[0], 3);     \
  99                                                                         \
 100     zero = vec_splat_s16 (0);                                           \
 101     shift = vec_splat_u16 (4);                                          \
 102                                                                         \
 103     vx0 = vec_mradds (vec_sl (block[0], shift), constants[1], zero);    \
 104     vx1 = vec_mradds (vec_sl (block[1], shift), constants[2], zero);    \
 105     vx2 = vec_mradds (vec_sl (block[2], shift), constants[3], zero);    \
 106     vx3 = vec_mradds (vec_sl (block[3], shift), constants[4], zero);    \
 107     vx4 = vec_mradds (vec_sl (block[4], shift), constants[1], zero);    \
 108     vx5 = vec_mradds (vec_sl (block[5], shift), constants[4], zero);    \
 109     vx6 = vec_mradds (vec_sl (block[6], shift), constants[3], zero);    \
 110     vx7 = vec_mradds (vec_sl (block[7], shift), constants[2], zero);    \
 111                                                                         \
 112     IDCT_HALF                                                           \
 113                                                                         \
 114     vx0 = vec_mergeh (vy0, vy4);                                        \
 115     vx1 = vec_mergel (vy0, vy4);                                        \
 116     vx2 = vec_mergeh (vy1, vy5);                                        \
 117     vx3 = vec_mergel (vy1, vy5);                                        \
 118     vx4 = vec_mergeh (vy2, vy6);                                        \
 119     vx5 = vec_mergel (vy2, vy6);                                        \
 120     vx6 = vec_mergeh (vy3, vy7);                                        \
 121     vx7 = vec_mergel (vy3, vy7);                                        \
 122                                                                         \
 123     vy0 = vec_mergeh (vx0, vx4);                                        \
 124     vy1 = vec_mergel (vx0, vx4);                                        \
 125     vy2 = vec_mergeh (vx1, vx5);                                        \
 126     vy3 = vec_mergel (vx1, vx5);                                        \
 127     vy4 = vec_mergeh (vx2, vx6);                                        \
 128     vy5 = vec_mergel (vx2, vx6);                                        \
 129     vy6 = vec_mergeh (vx3, vx7);                                        \
 130     vy7 = vec_mergel (vx3, vx7);                                        \
 131                                                                         \
 132     vx0 = vec_adds (vec_mergeh (vy0, vy4), bias);                       \
 133     vx1 = vec_mergel (vy0, vy4);                                        \
 134     vx2 = vec_mergeh (vy1, vy5);                                        \
 135     vx3 = vec_mergel (vy1, vy5);                                        \
 136     vx4 = vec_mergeh (vy2, vy6);                                        \
 137     vx5 = vec_mergel (vy2, vy6);                                        \
 138     vx6 = vec_mergeh (vy3, vy7);                                        \
 139     vx7 = vec_mergel (vy3, vy7);                                        \
 140                                                                         \
 141     IDCT_HALF                                                           \
 142                                                                         \
 143     shift = vec_splat_u16 (6);                                          \
 144     vx0 = vec_sra (vy0, shift);                                         \
 145     vx1 = vec_sra (vy1, shift);                                         \
 146     vx2 = vec_sra (vy2, shift);                                         \
 147     vx3 = vec_sra (vy3, shift);                                         \
 148     vx4 = vec_sra (vy4, shift);                                         \
 149     vx5 = vec_sra (vy5, shift);                                         \
 150     vx6 = vec_sra (vy6, shift);                                         \
 151     vx7 = vec_sra (vy7, shift);
 152
 153 static const vector_s16_t constants[5] = {
 154     (vector_s16_t)(23170, 13573, 6518, 21895, -23170, -21895, 32, 31),
 155     (vector_s16_t)(16384, 22725, 21407, 19266, 16384, 19266, 21407, 22725),
 156     (vector_s16_t)(22725, 31521, 29692, 26722, 22725, 26722, 29692, 31521),
 157     (vector_s16_t)(21407, 29692, 27969, 25172, 21407, 25172, 27969, 29692),
 158     (vector_s16_t)(19266, 26722, 25172, 22654, 19266, 22654, 25172, 26722)
 159 };
 160
 161 void idct_put_altivec(uint8_t* dest, int stride, vector_s16_t* block)
 162 {
 163     vector_u8_t tmp;
 164
 165     IDCT
 166
 167 #define COPY(dest,src)                                          \
 168     tmp = vec_packsu (src, src);                                \
 169     vec_ste ((vector_u32_t)tmp, 0, (unsigned int *)dest);       \
 170     vec_ste ((vector_u32_t)tmp, 4, (unsigned int *)dest);
 171
 172     COPY (dest, vx0)    dest += stride;
 173     COPY (dest, vx1)    dest += stride;
 174     COPY (dest, vx2)    dest += stride;
 175     COPY (dest, vx3)    dest += stride;
 176     COPY (dest, vx4)    dest += stride;
 177     COPY (dest, vx5)    dest += stride;
 178     COPY (dest, vx6)    dest += stride;
 179     COPY (dest, vx7)
 180 }
 181
 182 void idct_add_altivec(uint8_t* dest, int stride, vector_s16_t* block)
 183 {
 184     vector_u8_t tmp;
 185     vector_s16_t tmp2, tmp3;
 186     vector_u8_t perm0;
 187     vector_u8_t perm1;
 188     vector_u8_t p0, p1, p;
 189
 190     IDCT
 191
 192     p0 = vec_lvsl (0, dest);
 193     p1 = vec_lvsl (stride, dest);
 194     p = vec_splat_u8 (-1);
 195     perm0 = vec_mergeh (p, p0);
 196     perm1 = vec_mergeh (p, p1);
 197
 198 #define ADD(dest,src,perm)                                              \
 199     /* *(uint64_t *)&tmp = *(uint64_t *)dest; */                        \
 200     tmp = vec_ld (0, dest);                                             \
 201     tmp2 = (vector_s16_t)vec_perm (tmp, (vector_u8_t)zero, perm);       \
 202     tmp3 = vec_adds (tmp2, src);                                        \
 203     tmp = vec_packsu (tmp3, tmp3);                                      \
 204     vec_ste ((vector_u32_t)tmp, 0, (unsigned int *)dest);               \
 205     vec_ste ((vector_u32_t)tmp, 4, (unsigned int *)dest);
 206
 207     ADD (dest, vx0, perm0)      dest += stride;
 208     ADD (dest, vx1, perm1)      dest += stride;
 209     ADD (dest, vx2, perm0)      dest += stride;
 210     ADD (dest, vx3, perm1)      dest += stride;
 211     ADD (dest, vx4, perm0)      dest += stride;
 212     ADD (dest, vx5, perm1)      dest += stride;
 213     ADD (dest, vx6, perm0)      dest += stride;
 214     ADD (dest, vx7, perm1)
 215 }
 216