libavcodec/x86/svq1enc.c

   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav 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 2.1 of the License, or (at your option) any later version.
   8  *
   9  * Libav 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 Libav; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #include "config.h"
  20 #include "libavutil/attributes.h"
  21 #include "libavutil/cpu.h"
  22 #include "libavutil/x86/asm.h"
  23 #include "libavutil/x86/cpu.h"
  24 #include "libavcodec/svq1enc.h"
  25
  26 #if HAVE_INLINE_ASM
  27
  28 static int ssd_int8_vs_int16_mmx(const int8_t *pix1, const int16_t *pix2,
  29                                  int size)
  30 {
  31     int sum;
  32     x86_reg i = size;
  33
  34     __asm__ volatile (
  35         "pxor %%mm4, %%mm4 \n"
  36         "1: \n"
  37         "sub $8, %0 \n"
  38         "movq (%2, %0), %%mm2 \n"
  39         "movq (%3, %0, 2), %%mm0 \n"
  40         "movq 8(%3, %0, 2), %%mm1 \n"
  41         "punpckhbw %%mm2, %%mm3 \n"
  42         "punpcklbw %%mm2, %%mm2 \n"
  43         "psraw $8, %%mm3 \n"
  44         "psraw $8, %%mm2 \n"
  45         "psubw %%mm3, %%mm1 \n"
  46         "psubw %%mm2, %%mm0 \n"
  47         "pmaddwd %%mm1, %%mm1 \n"
  48         "pmaddwd %%mm0, %%mm0 \n"
  49         "paddd %%mm1, %%mm4 \n"
  50         "paddd %%mm0, %%mm4 \n"
  51         "jg 1b \n"
  52         "movq %%mm4, %%mm3 \n"
  53         "psrlq $32, %%mm3 \n"
  54         "paddd %%mm3, %%mm4 \n"
  55         "movd %%mm4, %1 \n"
  56         : "+r" (i), "=r" (sum)
  57         : "r" (pix1), "r" (pix2));
  58
  59     return sum;
  60 }
  61
  62 #endif /* HAVE_INLINE_ASM */
  63
  64 av_cold void ff_svq1enc_init_x86(SVQ1EncContext *c)
  65 {
  66 #if HAVE_INLINE_ASM
  67     int cpu_flags = av_get_cpu_flags();
  68
  69     if (INLINE_MMX(cpu_flags)) {
  70         c->ssd_int8_vs_int16 = ssd_int8_vs_int16_mmx;
  71     }
  72 #endif /* HAVE_INLINE_ASM */
  73 }