xref: /third_party/ffmpeg/libavcodec/arm/dca.h (revision cabdff1a) 
1/*
2 * Copyright (c) 2011 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 AVCODEC_ARM_DCA_H
22#define AVCODEC_ARM_DCA_H
23
24#include <stdint.h>
25
26#include "config.h"
27#include "libavcodec/mathops.h"
28
29#if HAVE_ARMV6_INLINE && AV_GCC_VERSION_AT_LEAST(4,4) && !CONFIG_THUMB
30
31#define decode_blockcodes decode_blockcodes
32static inline int decode_blockcodes(int code1, int code2, int levels,
33                                    int32_t *values)
34{
35    int32_t v0, v1, v2, v3, v4, v5;
36
37    __asm__ ("smmul   %0,  %6,  %10           \n"
38             "smmul   %3,  %7,  %10           \n"
39             "smlabb  %6,  %0,  %9,  %6       \n"
40             "smlabb  %7,  %3,  %9,  %7       \n"
41             "smmul   %1,  %0,  %10           \n"
42             "smmul   %4,  %3,  %10           \n"
43             "sub     %6,  %6,  %8,  lsr #1   \n"
44             "sub     %7,  %7,  %8,  lsr #1   \n"
45             "smlabb  %0,  %1,  %9,  %0       \n"
46             "smlabb  %3,  %4,  %9,  %3       \n"
47             "smmul   %2,  %1,  %10           \n"
48             "smmul   %5,  %4,  %10           \n"
49             "str     %6,  [%11, #0]          \n"
50             "str     %7,  [%11, #16]         \n"
51             "sub     %0,  %0,  %8,  lsr #1   \n"
52             "sub     %3,  %3,  %8,  lsr #1   \n"
53             "smlabb  %1,  %2,  %9,  %1       \n"
54             "smlabb  %4,  %5,  %9,  %4       \n"
55             "smmul   %6,  %2,  %10           \n"
56             "smmul   %7,  %5,  %10           \n"
57             "str     %0,  [%11, #4]          \n"
58             "str     %3,  [%11, #20]         \n"
59             "sub     %1,  %1,  %8,  lsr #1   \n"
60             "sub     %4,  %4,  %8,  lsr #1   \n"
61             "smlabb  %2,  %6,  %9,  %2       \n"
62             "smlabb  %5,  %7,  %9,  %5       \n"
63             "str     %1,  [%11, #8]          \n"
64             "str     %4,  [%11, #24]         \n"
65             "sub     %2,  %2,  %8,  lsr #1   \n"
66             "sub     %5,  %5,  %8,  lsr #1   \n"
67             "str     %2,  [%11, #12]         \n"
68             "str     %5,  [%11, #28]         \n"
69             : "=&r"(v0), "=&r"(v1), "=&r"(v2),
70               "=&r"(v3), "=&r"(v4), "=&r"(v5),
71               "+&r"(code1), "+&r"(code2)
72             : "r"(levels - 1), "r"(-levels),
73               "r"(ff_inverse[levels]), "r"(values)
74             : "memory");
75
76    return code1 | code2;
77}
78
79#endif
80
81#endif /* AVCODEC_ARM_DCA_H */
82