ae5fdb7eb87d9d2c8abffc077257c7325306f439
[deb_ffmpeg.git] / bswap.h
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 #ifndef AVUTIL_ARM_BSWAP_H
20 #define AVUTIL_ARM_BSWAP_H
21
22 #include <stdint.h>
23 #include "config.h"
24 #include "libavutil/attributes.h"
25
26 #ifdef __ARMCC_VERSION
27
28 #if HAVE_ARMV6
29 #define av_bswap32 av_bswap32
30 static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
31 {
32 return __rev(x);
33 }
34 #endif /* HAVE_ARMV6 */
35
36 #elif HAVE_INLINE_ASM
37
38 #if HAVE_ARMV6_INLINE
39 #define av_bswap16 av_bswap16
40 static av_always_inline av_const unsigned av_bswap16(unsigned x)
41 {
42 __asm__("rev16 %0, %0" : "+r"(x));
43 return x;
44 }
45 #endif
46
47 #if !AV_GCC_VERSION_AT_LEAST(4,5)
48 #define av_bswap32 av_bswap32
49 static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
50 {
51 #if HAVE_ARMV6_INLINE
52 __asm__("rev %0, %0" : "+r"(x));
53 #else
54 uint32_t t;
55 __asm__ ("eor %1, %0, %0, ror #16 \n\t"
56 "bic %1, %1, #0xFF0000 \n\t"
57 "mov %0, %0, ror #8 \n\t"
58 "eor %0, %0, %1, lsr #8 \n\t"
59 : "+r"(x), "=&r"(t));
60 #endif /* HAVE_ARMV6_INLINE */
61 return x;
62 }
63 #endif /* !AV_GCC_VERSION_AT_LEAST(4,5) */
64
65 #endif /* __ARMCC_VERSION */
66
67 #endif /* AVUTIL_ARM_BSWAP_H */