| 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 | /** |
| 20 | * @file |
| 21 | * byte swapping routines |
| 22 | */ |
| 23 | |
| 24 | #ifndef AVUTIL_X86_BSWAP_H |
| 25 | #define AVUTIL_X86_BSWAP_H |
| 26 | |
| 27 | #include <stdint.h> |
| 28 | #include "config.h" |
| 29 | #include "libavutil/attributes.h" |
| 30 | |
| 31 | #if HAVE_INLINE_ASM |
| 32 | |
| 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) |
| 36 | { |
| 37 | __asm__("rorw $8, %w0" : "+r"(x)); |
| 38 | return x; |
| 39 | } |
| 40 | #endif /* !AV_GCC_VERSION_AT_LEAST(4,1) */ |
| 41 | |
| 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) |
| 45 | { |
| 46 | __asm__("bswap %0" : "+r" (x)); |
| 47 | return x; |
| 48 | } |
| 49 | |
| 50 | #if ARCH_X86_64 |
| 51 | #define av_bswap64 av_bswap64 |
| 52 | static inline uint64_t av_const av_bswap64(uint64_t x) |
| 53 | { |
| 54 | __asm__("bswap %0": "=r" (x) : "0" (x)); |
| 55 | return x; |
| 56 | } |
| 57 | #endif |
| 58 | #endif /* !AV_GCC_VERSION_AT_LEAST(4,5) */ |
| 59 | |
| 60 | #endif /* HAVE_INLINE_ASM */ |
| 61 | #endif /* AVUTIL_X86_BSWAP_H */ |