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   1 /**
   2  * @file libavcodec/x86/vp6dsp_mmx.c
   3  * MMX-optimized functions for the VP6 decoder
   4  *
   5  * Copyright (C) 2009  Sebastien Lucas <sebastien.lucas@gmail.com>
   6  *
   7  * This file is part of FFmpeg.
   8  *
   9  * FFmpeg is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * FFmpeg is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with FFmpeg; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include "libavutil/x86_cpu.h"
  25 #include "libavcodec/dsputil.h"
  26 #include "dsputil_mmx.h"
  27 #include "vp6dsp_mmx.h"
  28
  29
  30 #define DIAG4_MMX(in1,in2,in3,in4)                                            \
  31     "movq  "#in1"(%0), %%mm0             \n\t"                                \
  32     "movq  "#in2"(%0), %%mm1             \n\t"                                \
  33     "movq       %%mm0, %%mm3             \n\t"                                \
  34     "movq       %%mm1, %%mm4             \n\t"                                \
  35     "punpcklbw  %%mm7, %%mm0             \n\t"                                \
  36     "punpcklbw  %%mm7, %%mm1             \n\t"                                \
  37     "punpckhbw  %%mm7, %%mm3             \n\t"                                \
  38     "punpckhbw  %%mm7, %%mm4             \n\t"                                \
  39     "pmullw     0(%2), %%mm0             \n\t" /* src[x-8 ] * biweight [0] */ \
  40     "pmullw     8(%2), %%mm1             \n\t" /* src[x   ] * biweight [1] */ \
  41     "pmullw     0(%2), %%mm3             \n\t" /* src[x-8 ] * biweight [0] */ \
  42     "pmullw     8(%2), %%mm4             \n\t" /* src[x   ] * biweight [1] */ \
  43     "paddw      %%mm1, %%mm0             \n\t"                                \
  44     "paddw      %%mm4, %%mm3             \n\t"                                \
  45     "movq  "#in3"(%0), %%mm1             \n\t"                                \
  46     "movq  "#in4"(%0), %%mm2             \n\t"                                \
  47     "movq       %%mm1, %%mm4             \n\t"                                \
  48     "movq       %%mm2, %%mm5             \n\t"                                \
  49     "punpcklbw  %%mm7, %%mm1             \n\t"                                \
  50     "punpcklbw  %%mm7, %%mm2             \n\t"                                \
  51     "punpckhbw  %%mm7, %%mm4             \n\t"                                \
  52     "punpckhbw  %%mm7, %%mm5             \n\t"                                \
  53     "pmullw    16(%2), %%mm1             \n\t" /* src[x+8 ] * biweight [2] */ \
  54     "pmullw    24(%2), %%mm2             \n\t" /* src[x+16] * biweight [3] */ \
  55     "pmullw    16(%2), %%mm4             \n\t" /* src[x+8 ] * biweight [2] */ \
  56     "pmullw    24(%2), %%mm5             \n\t" /* src[x+16] * biweight [3] */ \
  57     "paddw      %%mm2, %%mm1             \n\t"                                \
  58     "paddw      %%mm5, %%mm4             \n\t"                                \
  59     "paddsw     %%mm1, %%mm0             \n\t"                                \
  60     "paddsw     %%mm4, %%mm3             \n\t"                                \
  61     "paddsw     %%mm6, %%mm0             \n\t" /* Add 64 */                   \
  62     "paddsw     %%mm6, %%mm3             \n\t" /* Add 64 */                   \
  63     "psraw         $7, %%mm0             \n\t"                                \
  64     "psraw         $7, %%mm3             \n\t"                                \
  65     "packuswb   %%mm3, %%mm0             \n\t"                                \
  66     "movq       %%mm0,  (%1)             \n\t"
  67
  68 void ff_vp6_filter_diag4_mmx(uint8_t *dst, uint8_t *src, int stride,
  69                              const int16_t *h_weights, const int16_t *v_weights)
  70 {
  71     uint8_t tmp[8*11], *t = tmp;
  72     int16_t weights[4*4];
  73     int i;
  74     src -= stride;
  75
  76     for (i=0; i<4*4; i++)
  77         weights[i] = h_weights[i>>2];
  78
  79     __asm__ volatile(
  80     "pxor %%mm7, %%mm7                   \n\t"
  81     "movq "MANGLE(ff_pw_64)", %%mm6      \n\t"
  82     "1:                                  \n\t"
  83     DIAG4_MMX(-1,0,1,2)
  84     "add  $8, %1                         \n\t"
  85     "add  %3, %0                         \n\t"
  86     "decl %4                             \n\t"
  87     "jnz 1b                              \n\t"
  88     : "+r"(src), "+r"(t)
  89     : "r"(weights), "r"((x86_reg)stride), "r"(11)
  90     : "memory");
  91
  92     t = tmp + 8;
  93     for (i=0; i<4*4; i++)
  94         weights[i] = v_weights[i>>2];
  95
  96     __asm__ volatile(
  97     "pxor %%mm7, %%mm7                   \n\t"
  98     "movq "MANGLE(ff_pw_64)", %%mm6      \n\t"
  99     "1:                                  \n\t"
 100     DIAG4_MMX(-8,0,8,16)
 101     "add  $8, %0                         \n\t"
 102     "add  %3, %1                         \n\t"
 103     "decl %4                             \n\t"
 104     "jnz 1b                              \n\t"
 105     : "+r"(t), "+r"(dst)
 106     : "r"(weights), "r"((x86_reg)stride), "r"(8)
 107     : "memory");
 108 }