1/*
2 * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21#ifndef AVUTIL_ARM_INTMATH_H
22#define AVUTIL_ARM_INTMATH_H
23
24#include "config.h"
25#include "libavutil/attributes.h"
26
27#if HAVE_INLINE_ASM
28
29#if HAVE_ARMV6
30static inline av_const int FASTDIV(int a, int b)
31{
32    int r, t;
33    __asm__ volatile("cmp     %3, #2               \n\t"
34                     "ldr     %1, [%4, %3, lsl #2] \n\t"
35                     "lsrle   %0, %2, #1           \n\t"
36                     "smmulgt %0, %1, %2           \n\t"
37                     : "=&r"(r), "=&r"(t) : "r"(a), "r"(b), "r"(ff_inverse));
38    return r;
39}
40#else
41static inline av_const int FASTDIV(int a, int b)
42{
43    int r, t;
44    __asm__ volatile("umull %1, %0, %2, %3"
45                     : "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b]));
46    return r;
47}
48#endif
49
50#define FASTDIV FASTDIV
51
52#endif /* HAVE_INLINE_ASM */
53
54#endif /* AVUTIL_ARM_INTMATH_H */
55