mathops.h
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1 /*
2  * simple math operations
3  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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 #include <stdint.h>
26 #include "config.h"
27 #include "libavutil/common.h"
28 
29 #if HAVE_INLINE_ASM
30 
31 #if HAVE_ARMV6
32 #define MULH MULH
33 static inline av_const int MULH(int a, int b)
34 {
35  int r;
36  __asm__ ("smmul %0, %1, %2" : "=r"(r) : "r"(a), "r"(b));
37  return r;
38 }
39 #endif
40 
41 #define MLS64(d, a, b) MAC64(d, -(a), b)
42 
43 #if HAVE_ARMV5TE
44 
45 /* signed 16x16 -> 32 multiply add accumulate */
46 # define MAC16(rt, ra, rb) \
47  __asm__ ("smlabb %0, %1, %2, %0" : "+r"(rt) : "r"(ra), "r"(rb));
48 
49 /* signed 16x16 -> 32 multiply */
50 # define MUL16 MUL16
51 static inline av_const int MUL16(int ra, int rb)
52 {
53  int rt;
54  __asm__ ("smulbb %0, %1, %2" : "=r"(rt) : "r"(ra), "r"(rb));
55  return rt;
56 }
57 
58 #endif
59 
60 #define mid_pred mid_pred
61 static inline av_const int mid_pred(int a, int b, int c)
62 {
63  int m;
64  __asm__ (
65  "mov %0, %2 \n\t"
66  "cmp %1, %2 \n\t"
67  "itt gt \n\t"
68  "movgt %0, %1 \n\t"
69  "movgt %1, %2 \n\t"
70  "cmp %1, %3 \n\t"
71  "it le \n\t"
72  "movle %1, %3 \n\t"
73  "cmp %0, %1 \n\t"
74  "it gt \n\t"
75  "movgt %0, %1 \n\t"
76  : "=&r"(m), "+r"(a)
77  : "r"(b), "r"(c)
78  : "cc");
79  return m;
80 }
81 
82 #endif /* HAVE_INLINE_ASM */
83 
84 #endif /* AVCODEC_ARM_MATHOPS_H */