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  1. /*
  2.  * Copyright (c) 2012
  3.  *      MIPS Technologies, Inc., California.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  * 1. Redistributions of source code must retain the above copyright
  9.  *    notice, this list of conditions and the following disclaimer.
  10.  * 2. Redistributions in binary form must reproduce the above copyright
  11.  *    notice, this list of conditions and the following disclaimer in the
  12.  *    documentation and/or other materials provided with the distribution.
  13.  * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
  14.  *    contributors may be used to endorse or promote products derived from
  15.  *    this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
  18.  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20.  * ARE DISCLAIMED.  IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
  21.  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25.  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26.  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27.  * SUCH DAMAGE.
  28.  *
  29.  * Author:  Nedeljko Babic (nbabic@mips.com)
  30.  *
  31.  * Math operations optimized for MIPS
  32.  *
  33.  * This file is part of FFmpeg.
  34.  *
  35.  * FFmpeg is free software; you can redistribute it and/or
  36.  * modify it under the terms of the GNU Lesser General Public
  37.  * License as published by the Free Software Foundation; either
  38.  * version 2.1 of the License, or (at your option) any later version.
  39.  *
  40.  * FFmpeg is distributed in the hope that it will be useful,
  41.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  42.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  43.  * Lesser General Public License for more details.
  44.  *
  45.  * You should have received a copy of the GNU Lesser General Public
  46.  * License along with FFmpeg; if not, write to the Free Software
  47.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  48.  */
  49.  
  50. /**
  51.  * @file
  52.  * Reference: libavcodec/celp_math.c
  53.  */
  54. #include "config.h"
  55. #include "libavcodec/celp_math.h"
  56.  
  57. #if HAVE_INLINE_ASM
  58. static float ff_dot_productf_mips(const float* a, const float* b,
  59.                                               int length)
  60. {
  61.     float sum;
  62.     const float* a_end = a + length;
  63.  
  64.     __asm__ volatile (
  65.         "mtc1   $zero,      %[sum]                              \n\t"
  66.         "blez   %[length],  ff_dot_productf_end%=               \n\t"
  67.         "ff_dot_productf_madd%=:                                \n\t"
  68.         "lwc1   $f2,        0(%[a])                             \n\t"
  69.         "lwc1   $f1,        0(%[b])                             \n\t"
  70.         "addiu  %[a],       %[a],      4                        \n\t"
  71.         "addiu  %[b],       %[b],      4                        \n\t"
  72.         "madd.s %[sum],     %[sum],    $f1, $f2                 \n\t"
  73.         "bne   %[a],        %[a_end],  ff_dot_productf_madd%=   \n\t"
  74.         "ff_dot_productf_end%=:                                 \n\t"
  75.  
  76.         : [sum] "=&f" (sum), [a] "+r" (a), [b] "+r" (b)
  77.         : [a_end]"r"(a_end), [length] "r" (length)
  78.         : "$f1", "$f2", "memory"
  79.     );
  80.     return sum;
  81. }
  82. #endif /* HAVE_INLINE_ASM */
  83.  
  84. void ff_celp_math_init_mips(CELPMContext *c)
  85. {
  86. #if HAVE_INLINE_ASM
  87.     c->dot_productf = ff_dot_productf_mips;
  88. #endif
  89. }
  90.