ARM: change argument/return type of bswap_16() to unsigned 32-bit
[libav.git] / libavutil / arm / 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/common.h"
25
26 #ifdef __ARMCC_VERSION
27
28 #if HAVE_ARMV6
29 #define bswap_16 bswap_16
30 static av_always_inline av_const unsigned bswap_16(unsigned x)
31 {
32 __asm { rev16 x, x }
33 return x;
34 }
35
36 #define bswap_32 bswap_32
37 static av_always_inline av_const uint32_t bswap_32(uint32_t x)
38 {
39 return __rev(x);
40 }
41 #endif /* HAVE_ARMV6 */
42
43 #elif HAVE_INLINE_ASM
44
45 #if HAVE_ARMV6
46 #define bswap_16 bswap_16
47 static av_always_inline av_const unsigned bswap_16(unsigned x)
48 {
49 __asm__("rev16 %0, %0" : "+r"(x));
50 return x;
51 }
52 #endif
53
54 #define bswap_32 bswap_32
55 static av_always_inline av_const uint32_t bswap_32(uint32_t x)
56 {
57 #if HAVE_ARMV6
58 __asm__("rev %0, %0" : "+r"(x));
59 #else
60 uint32_t t;
61 __asm__ ("eor %1, %0, %0, ror #16 \n\t"
62 "bic %1, %1, #0xFF0000 \n\t"
63 "mov %0, %0, ror #8 \n\t"
64 "eor %0, %0, %1, lsr #8 \n\t"
65 : "+r"(x), "=&r"(t));
66 #endif /* HAVE_ARMV6 */
67 return x;
68 }
69
70 #endif /* __ARMCC_VERSION */
71
72 #endif /* AVUTIL_ARM_BSWAP_H */