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 #include "gcc_fixes.h"
  43
  44 #include "dsputil_altivec.h"
  45
  46 #define vector_s16_t vector signed short
  47 #define vector_u16_t vector unsigned short
  48 #define vector_s8_t vector signed char
  49 #define vector_u8_t vector unsigned char
  50 #define vector_s32_t vector signed int
  51 #define vector_u32_t vector unsigned int
  52
  53 #define IDCT_HALF                                       \
  54     /* 1st stage */                                     \
  55     t1 = vec_mradds (a1, vx7, vx1 );                    \
  56     t8 = vec_mradds (a1, vx1, vec_subs (zero, vx7));    \
  57     t7 = vec_mradds (a2, vx5, vx3);                     \
  58     t3 = vec_mradds (ma2, vx3, vx5);                    \
  59                                                         \
  60     /* 2nd stage */                                     \
  61     t5 = vec_adds (vx0, vx4);                           \
  62     t0 = vec_subs (vx0, vx4);                           \
  63     t2 = vec_mradds (a0, vx6, vx2);                     \
  64     t4 = vec_mradds (a0, vx2, vec_subs (zero, vx6));    \
  65     t6 = vec_adds (t8, t3);                             \
  66     t3 = vec_subs (t8, t3);                             \
  67     t8 = vec_subs (t1, t7);                             \
  68     t1 = vec_adds (t1, t7);                             \
  69                                                         \
  70     /* 3rd stage */                                     \
  71     t7 = vec_adds (t5, t2);                             \
  72     t2 = vec_subs (t5, t2);                             \
  73     t5 = vec_adds (t0, t4);                             \
  74     t0 = vec_subs (t0, t4);                             \
  75     t4 = vec_subs (t8, t3);                             \
  76     t3 = vec_adds (t8, t3);                             \
  77                                                         \
  78     /* 4th stage */                                     \
  79     vy0 = vec_adds (t7, t1);                            \
  80     vy7 = vec_subs (t7, t1);                            \
  81     vy1 = vec_mradds (c4, t3, t5);                      \
  82     vy6 = vec_mradds (mc4, t3, t5);                     \
  83     vy2 = vec_mradds (c4, t4, t0);                      \
  84     vy5 = vec_mradds (mc4, t4, t0);                     \
  85     vy3 = vec_adds (t2, t6);                            \
  86     vy4 = vec_subs (t2, t6);
  87
  88
  89 #define IDCT                                                            \
  90     vector_s16_t vx0, vx1, vx2, vx3, vx4, vx5, vx6, vx7;                \
  91     vector_s16_t vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7;                \
  92     vector_s16_t a0, a1, a2, ma2, c4, mc4, zero, bias;                  \
  93     vector_s16_t t0, t1, t2, t3, t4, t5, t6, t7, t8;                    \
  94     vector_u16_t shift;                                                 \
  95                                                                         \
  96     c4 = vec_splat (constants[0], 0);                                   \
  97     a0 = vec_splat (constants[0], 1);                                   \
  98     a1 = vec_splat (constants[0], 2);                                   \
  99     a2 = vec_splat (constants[0], 3);                                   \
 100     mc4 = vec_splat (constants[0], 4);                                  \
 101     ma2 = vec_splat (constants[0], 5);                                  \
 102     bias = (vector_s16_t)vec_splat ((vector_s32_t)constants[0], 3);     \
 103                                                                         \
 104     zero = vec_splat_s16 (0);                                           \
 105     shift = vec_splat_u16 (4);                                          \
 106                                                                         \
 107     vx0 = vec_mradds (vec_sl (block[0], shift), constants[1], zero);    \
 108     vx1 = vec_mradds (vec_sl (block[1], shift), constants[2], zero);    \
 109     vx2 = vec_mradds (vec_sl (block[2], shift), constants[3], zero);    \
 110     vx3 = vec_mradds (vec_sl (block[3], shift), constants[4], zero);    \
 111     vx4 = vec_mradds (vec_sl (block[4], shift), constants[1], zero);    \
 112     vx5 = vec_mradds (vec_sl (block[5], shift), constants[4], zero);    \
 113     vx6 = vec_mradds (vec_sl (block[6], shift), constants[3], zero);    \
 114     vx7 = vec_mradds (vec_sl (block[7], shift), constants[2], zero);    \
 115                                                                         \
 116     IDCT_HALF                                                           \
 117                                                                         \
 118     vx0 = vec_mergeh (vy0, vy4);                                        \
 119     vx1 = vec_mergel (vy0, vy4);                                        \
 120     vx2 = vec_mergeh (vy1, vy5);                                        \
 121     vx3 = vec_mergel (vy1, vy5);                                        \
 122     vx4 = vec_mergeh (vy2, vy6);                                        \
 123     vx5 = vec_mergel (vy2, vy6);                                        \
 124     vx6 = vec_mergeh (vy3, vy7);                                        \
 125     vx7 = vec_mergel (vy3, vy7);                                        \
 126                                                                         \
 127     vy0 = vec_mergeh (vx0, vx4);                                        \
 128     vy1 = vec_mergel (vx0, vx4);                                        \
 129     vy2 = vec_mergeh (vx1, vx5);                                        \
 130     vy3 = vec_mergel (vx1, vx5);                                        \
 131     vy4 = vec_mergeh (vx2, vx6);                                        \
 132     vy5 = vec_mergel (vx2, vx6);                                        \
 133     vy6 = vec_mergeh (vx3, vx7);                                        \
 134     vy7 = vec_mergel (vx3, vx7);                                        \
 135                                                                         \
 136     vx0 = vec_adds (vec_mergeh (vy0, vy4), bias);                       \
 137     vx1 = vec_mergel (vy0, vy4);                                        \
 138     vx2 = vec_mergeh (vy1, vy5);                                        \
 139     vx3 = vec_mergel (vy1, vy5);                                        \
 140     vx4 = vec_mergeh (vy2, vy6);                                        \
 141     vx5 = vec_mergel (vy2, vy6);                                        \
 142     vx6 = vec_mergeh (vy3, vy7);                                        \
 143     vx7 = vec_mergel (vy3, vy7);                                        \
 144                                                                         \
 145     IDCT_HALF                                                           \
 146                                                                         \
 147     shift = vec_splat_u16 (6);                                          \
 148     vx0 = vec_sra (vy0, shift);                                         \
 149     vx1 = vec_sra (vy1, shift);                                         \
 150     vx2 = vec_sra (vy2, shift);                                         \
 151     vx3 = vec_sra (vy3, shift);                                         \
 152     vx4 = vec_sra (vy4, shift);                                         \
 153     vx5 = vec_sra (vy5, shift);                                         \
 154     vx6 = vec_sra (vy6, shift);                                         \
 155     vx7 = vec_sra (vy7, shift);
 156
 157
 158 static const vector_s16_t constants[5] = {
 159     (vector_s16_t) AVV(23170, 13573, 6518, 21895, -23170, -21895, 32, 31),
 160     (vector_s16_t) AVV(16384, 22725, 21407, 19266, 16384, 19266, 21407, 22725),
 161     (vector_s16_t) AVV(22725, 31521, 29692, 26722, 22725, 26722, 29692, 31521),
 162     (vector_s16_t) AVV(21407, 29692, 27969, 25172, 21407, 25172, 27969, 29692),
 163     (vector_s16_t) AVV(19266, 26722, 25172, 22654, 19266, 22654, 25172, 26722)
 164 };
 165
 166 void idct_put_altivec(uint8_t* dest, int stride, vector_s16_t* block)
 167 {
 168 POWERPC_PERF_DECLARE(altivec_idct_put_num, 1);
 169 #ifdef ALTIVEC_USE_REFERENCE_C_CODE
 170 POWERPC_PERF_START_COUNT(altivec_idct_put_num, 1);
 171     void simple_idct_put(uint8_t *dest, int line_size, int16_t *block);
 172     simple_idct_put(dest, stride, (int16_t*)block);
 173 POWERPC_PERF_STOP_COUNT(altivec_idct_put_num, 1);
 174 #else /* ALTIVEC_USE_REFERENCE_C_CODE */
 175     vector_u8_t tmp;
 176
 177 POWERPC_PERF_START_COUNT(altivec_idct_put_num, 1);
 178
 179     IDCT
 180
 181 #define COPY(dest,src)                                          \
 182     tmp = vec_packsu (src, src);                                \
 183     vec_ste ((vector_u32_t)tmp, 0, (unsigned int *)dest);       \
 184     vec_ste ((vector_u32_t)tmp, 4, (unsigned int *)dest);
 185
 186     COPY (dest, vx0)    dest += stride;
 187     COPY (dest, vx1)    dest += stride;
 188     COPY (dest, vx2)    dest += stride;
 189     COPY (dest, vx3)    dest += stride;
 190     COPY (dest, vx4)    dest += stride;
 191     COPY (dest, vx5)    dest += stride;
 192     COPY (dest, vx6)    dest += stride;
 193     COPY (dest, vx7)
 194
 195 POWERPC_PERF_STOP_COUNT(altivec_idct_put_num, 1);
 196 #endif /* ALTIVEC_USE_REFERENCE_C_CODE */
 197 }
 198
 199 void idct_add_altivec(uint8_t* dest, int stride, vector_s16_t* block)
 200 {
 201 POWERPC_PERF_DECLARE(altivec_idct_add_num, 1);
 202 #ifdef ALTIVEC_USE_REFERENCE_C_CODE
 203 POWERPC_PERF_START_COUNT(altivec_idct_add_num, 1);
 204     void simple_idct_add(uint8_t *dest, int line_size, int16_t *block);
 205     simple_idct_add(dest, stride, (int16_t*)block);
 206 POWERPC_PERF_STOP_COUNT(altivec_idct_add_num, 1);
 207 #else /* ALTIVEC_USE_REFERENCE_C_CODE */
 208     vector_u8_t tmp;
 209     vector_s16_t tmp2, tmp3;
 210     vector_u8_t perm0;
 211     vector_u8_t perm1;
 212     vector_u8_t p0, p1, p;
 213
 214 POWERPC_PERF_START_COUNT(altivec_idct_add_num, 1);
 215
 216     IDCT
 217
 218     p0 = vec_lvsl (0, dest);
 219     p1 = vec_lvsl (stride, dest);
 220     p = vec_splat_u8 (-1);
 221     perm0 = vec_mergeh (p, p0);
 222     perm1 = vec_mergeh (p, p1);
 223
 224 #define ADD(dest,src,perm)                                              \
 225     /* *(uint64_t *)&tmp = *(uint64_t *)dest; */                        \
 226     tmp = vec_ld (0, dest);                                             \
 227     tmp2 = (vector_s16_t)vec_perm (tmp, (vector_u8_t)zero, perm);       \
 228     tmp3 = vec_adds (tmp2, src);                                        \
 229     tmp = vec_packsu (tmp3, tmp3);                                      \
 230     vec_ste ((vector_u32_t)tmp, 0, (unsigned int *)dest);               \
 231     vec_ste ((vector_u32_t)tmp, 4, (unsigned int *)dest);
 232
 233     ADD (dest, vx0, perm0)      dest += stride;
 234     ADD (dest, vx1, perm1)      dest += stride;
 235     ADD (dest, vx2, perm0)      dest += stride;
 236     ADD (dest, vx3, perm1)      dest += stride;
 237     ADD (dest, vx4, perm0)      dest += stride;
 238     ADD (dest, vx5, perm1)      dest += stride;
 239     ADD (dest, vx6, perm0)      dest += stride;
 240     ADD (dest, vx7, perm1)
 241
 242 POWERPC_PERF_STOP_COUNT(altivec_idct_add_num, 1);
 243 #endif /* ALTIVEC_USE_REFERENCE_C_CODE */
 244 }
 245