Statistics
| Branch: | Revision:

ffmpeg / libavcodec / armv4l / mathops.h @ 699b3f99

History | View | Annotate | Download (1.82 KB)

1
/*
2
 * simple math operations
3
 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
#ifndef AVCODEC_ARM_MATHOPS_H
23
#define AVCODEC_ARM_MATHOPS_H
24

    
25
#ifdef FRAC_BITS
26
#   define MULL(a, b) \
27
        ({  int lo, hi;\
28
         asm("smull %0, %1, %2, %3     \n\t"\
29
             "mov   %0, %0,     lsr %4\n\t"\
30
             "add   %1, %0, %1, lsl %5\n\t"\
31
             : "=&r"(lo), "=&r"(hi)\
32
             : "r"(b), "r"(a), "i"(FRAC_BITS), "i"(32-FRAC_BITS));\
33
         hi; })
34
#endif
35

    
36
#define MULH(a, b) \
37
    ({ int lo, hi;\
38
     asm ("smull %0, %1, %2, %3" : "=&r"(lo), "=&r"(hi) : "r"(b), "r"(a));\
39
     hi; })
40

    
41
#if defined(HAVE_ARMV5TE)
42

    
43
/* signed 16x16 -> 32 multiply add accumulate */
44
#   define MAC16(rt, ra, rb) \
45
        asm ("smlabb %0, %2, %3, %0" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb));
46
/* signed 16x16 -> 32 multiply */
47
#   define MUL16(ra, rb)                                                \
48
        ({ int __rt;                                                    \
49
         asm ("smulbb %0, %1, %2" : "=r" (__rt) : "r" (ra), "r" (rb));  \
50
         __rt; })
51

    
52
#endif
53

    
54
#endif