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
33static 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
51static 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
61static 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 */
85