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2ba45a60 DM |
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 */ |