FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
mathops.h
Go to the documentation of this file.
1 /*
2  * simple math operations
3  *
4  * Copyright (C) 2007 Marc Hoffman <mmhoffm@gmail.com>
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 #ifndef AVCODEC_BFIN_MATHOPS_H
23 #define AVCODEC_BFIN_MATHOPS_H
24 
25 #include "config.h"
26 
27 #define MULH(X,Y) ({ int xxo; \
28  __asm__ ( \
29  "a1 = %2.L * %1.L (FU);\n\t" \
30  "a1 = a1 >> 16;\n\t" \
31  "a1 += %2.H * %1.L (IS,M);\n\t" \
32  "a0 = %1.H * %2.H, a1+= %1.H * %2.L (IS,M);\n\t"\
33  "a1 = a1 >>> 16;\n\t" \
34  "%0 = (a0 += a1);\n\t" \
35  : "=d" (xxo) : "d" (X), "d" (Y) : "A0","A1"); xxo; })
36 
37 /* signed 16x16 -> 32 multiply */
38 #define MUL16(a, b) ({ int xxo; \
39  __asm__ ( \
40  "%0 = %1.l*%2.l (is);\n\t" \
41  : "=W" (xxo) : "d" (a), "d" (b) : "A1"); \
42  xxo; })
43 
44 #endif /* AVCODEC_BFIN_MATHOPS_H */