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libavcodec/arm/mpegvideo_iwmmxt.c

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00001 /*
00002  * copyright (c) 2004 AGAWA Koji
00003  *
00004  * This file is part of Libav.
00005  *
00006  * Libav is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * Libav is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with Libav; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00021 #include "libavutil/cpu.h"
00022 #include "libavcodec/avcodec.h"
00023 #include "libavcodec/dsputil.h"
00024 #include "libavcodec/mpegvideo.h"
00025 #include "mpegvideo_arm.h"
00026 
00027 static void dct_unquantize_h263_intra_iwmmxt(MpegEncContext *s,
00028                                              DCTELEM *block, int n, int qscale)
00029 {
00030     int level, qmul, qadd;
00031     int nCoeffs;
00032     DCTELEM *block_orig = block;
00033 
00034     assert(s->block_last_index[n]>=0);
00035 
00036     qmul = qscale << 1;
00037 
00038     if (!s->h263_aic) {
00039         if (n < 4)
00040             level = block[0] * s->y_dc_scale;
00041         else
00042             level = block[0] * s->c_dc_scale;
00043         qadd = (qscale - 1) | 1;
00044     }else{
00045         qadd = 0;
00046         level = block[0];
00047     }
00048     if(s->ac_pred)
00049         nCoeffs=63;
00050     else
00051         nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];
00052 
00053     __asm__ volatile (
00054 /*      "movd %1, %%mm6                 \n\t" //qmul */
00055 /*      "packssdw %%mm6, %%mm6          \n\t" */
00056 /*      "packssdw %%mm6, %%mm6          \n\t" */
00057         "tbcsth wr6, %[qmul]            \n\t"
00058 /*      "movd %2, %%mm5                 \n\t" //qadd */
00059 /*      "packssdw %%mm5, %%mm5          \n\t" */
00060 /*      "packssdw %%mm5, %%mm5          \n\t" */
00061         "tbcsth wr5, %[qadd]            \n\t"
00062         "wzero wr7                      \n\t" /* "pxor %%mm7, %%mm7             \n\t" */
00063         "wzero wr4                      \n\t" /* "pxor %%mm4, %%mm4             \n\t" */
00064         "wsubh wr7, wr5, wr7            \n\t" /* "psubw %%mm5, %%mm7            \n\t" */
00065         "1:                             \n\t"
00066         "wldrd wr2, [%[block]]          \n\t" /* "movq (%0, %3), %%mm0          \n\t" */
00067         "wldrd wr3, [%[block], #8]      \n\t" /* "movq 8(%0, %3), %%mm1         \n\t" */
00068         "wmulsl wr0, wr6, wr2           \n\t" /* "pmullw %%mm6, %%mm0           \n\t" */
00069         "wmulsl wr1, wr6, wr3           \n\t" /* "pmullw %%mm6, %%mm1           \n\t" */
00070 /*      "movq (%0, %3), %%mm2           \n\t" */
00071 /*      "movq 8(%0, %3), %%mm3          \n\t" */
00072         "wcmpgtsh wr2, wr4, wr2         \n\t" /* "pcmpgtw %%mm4, %%mm2          \n\t" // block[i] < 0 ? -1 : 0 */
00073         "wcmpgtsh wr3, wr4, wr2         \n\t" /* "pcmpgtw %%mm4, %%mm3          \n\t" // block[i] < 0 ? -1 : 0 */
00074         "wxor wr0, wr2, wr0             \n\t" /* "pxor %%mm2, %%mm0             \n\t" */
00075         "wxor wr1, wr3, wr1             \n\t" /* "pxor %%mm3, %%mm1             \n\t" */
00076         "waddh wr0, wr7, wr0            \n\t" /* "paddw %%mm7, %%mm0            \n\t" */
00077         "waddh wr1, wr7, wr1            \n\t" /* "paddw %%mm7, %%mm1            \n\t" */
00078         "wxor wr2, wr0, wr2             \n\t" /* "pxor %%mm0, %%mm2             \n\t" */
00079         "wxor wr3, wr1, wr3             \n\t" /* "pxor %%mm1, %%mm3             \n\t" */
00080         "wcmpeqh wr0, wr7, wr0          \n\t" /* "pcmpeqw %%mm7, %%mm0          \n\t" // block[i] == 0 ? -1 : 0 */
00081         "wcmpeqh wr1, wr7, wr1          \n\t" /* "pcmpeqw %%mm7, %%mm1          \n\t" // block[i] == 0 ? -1 : 0 */
00082         "wandn wr0, wr2, wr0            \n\t" /* "pandn %%mm2, %%mm0            \n\t" */
00083         "wandn wr1, wr3, wr1            \n\t" /* "pandn %%mm3, %%mm1            \n\t" */
00084         "wstrd wr0, [%[block]]          \n\t" /* "movq %%mm0, (%0, %3)          \n\t" */
00085         "wstrd wr1, [%[block], #8]      \n\t" /* "movq %%mm1, 8(%0, %3)         \n\t" */
00086         "add %[block], %[block], #16    \n\t" /* "addl $16, %3                  \n\t" */
00087         "subs %[i], %[i], #1            \n\t"
00088         "bne 1b                         \n\t" /* "jng 1b                                \n\t" */
00089         :[block]"+r"(block)
00090         :[i]"r"((nCoeffs + 8) / 8), [qmul]"r"(qmul), [qadd]"r"(qadd)
00091         :"memory");
00092 
00093     block_orig[0] = level;
00094 }
00095 
00096 void MPV_common_init_iwmmxt(MpegEncContext *s)
00097 {
00098     if (!(mm_flags & AV_CPU_FLAG_IWMMXT)) return;
00099 
00100     s->dct_unquantize_h263_intra = dct_unquantize_h263_intra_iwmmxt;
00101 }
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