2 * This file is part of FFmpeg.
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.
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.
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
21 * byte swapping routines
24 #ifndef AVUTIL_X86_BSWAP_H
25 #define AVUTIL_X86_BSWAP_H
29 #include "libavutil/attributes.h"
33 #if !AV_GCC_VERSION_AT_LEAST(4,1)
34 #define av_bswap16 av_bswap16
35 static av_always_inline av_const unsigned av_bswap16(unsigned x)
37 __asm__("rorw $8, %w0" : "+r"(x));
40 #endif /* !AV_GCC_VERSION_AT_LEAST(4,1) */
42 #if !AV_GCC_VERSION_AT_LEAST(4,5)
43 #define av_bswap32 av_bswap32
44 static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
46 __asm__("bswap %0" : "+r" (x));
51 #define av_bswap64 av_bswap64
52 static inline uint64_t av_const av_bswap64(uint64_t x)
54 __asm__("bswap %0": "=r" (x) : "0" (x));
58 #endif /* !AV_GCC_VERSION_AT_LEAST(4,5) */
60 #endif /* HAVE_INLINE_ASM */
61 #endif /* AVUTIL_X86_BSWAP_H */