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celp_math_mips.c
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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 #include "libavutil/mips/asmdefs.h"
57 
58 #if HAVE_INLINE_ASM
59 static float ff_dot_productf_mips(const float* a, const float* b,
60  int length)
61 {
62  float sum;
63  const float* a_end = a + length;
64 
65  __asm__ volatile (
66  "mtc1 $zero, %[sum] \n\t"
67  "blez %[length], ff_dot_productf_end%= \n\t"
68  "ff_dot_productf_madd%=: \n\t"
69  "lwc1 $f2, 0(%[a]) \n\t"
70  "lwc1 $f1, 0(%[b]) \n\t"
71  PTR_ADDIU "%[a], %[a], 4 \n\t"
72  PTR_ADDIU "%[b], %[b], 4 \n\t"
73  "madd.s %[sum], %[sum], $f1, $f2 \n\t"
74  "bne %[a], %[a_end], ff_dot_productf_madd%= \n\t"
75  "ff_dot_productf_end%=: \n\t"
76 
77  : [sum] "=&f" (sum), [a] "+r" (a), [b] "+r" (b)
78  : [a_end]"r"(a_end), [length] "r" (length)
79  : "$f1", "$f2", "memory"
80  );
81  return sum;
82 }
83 #endif /* HAVE_INLINE_ASM */
84 
86 {
87 #if HAVE_INLINE_ASM
88  c->dot_productf = ff_dot_productf_mips;
89 #endif
90 }