| /* |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * byte swapping routines |
| */ |
| |
| #ifndef AVUTIL_X86_BSWAP_H |
| #define AVUTIL_X86_BSWAP_H |
| |
| #include <stdint.h> |
| #if defined(_MSC_VER) |
| #include <stdlib.h> |
| #include <intrin.h> |
| #endif |
| #include "config.h" |
| #include "libavutil/attributes.h" |
| |
| #if defined(_MSC_VER) |
| |
| #define av_bswap16 av_bswap16 |
| static av_always_inline av_const uint16_t av_bswap16(uint16_t x) |
| { |
| return _rotr16(x, 8); |
| } |
| |
| #define av_bswap32 av_bswap32 |
| static av_always_inline av_const uint32_t av_bswap32(uint32_t x) |
| { |
| return _byteswap_ulong(x); |
| } |
| |
| #if ARCH_X86_64 |
| #define av_bswap64 av_bswap64 |
| static inline uint64_t av_const av_bswap64(uint64_t x) |
| { |
| return _byteswap_uint64(x); |
| } |
| #endif |
| |
| |
| #elif HAVE_INLINE_ASM |
| |
| #if AV_GCC_VERSION_AT_MOST(4,0) |
| #define av_bswap16 av_bswap16 |
| static av_always_inline av_const unsigned av_bswap16(unsigned x) |
| { |
| __asm__("rorw $8, %w0" : "+r"(x)); |
| return x; |
| } |
| #endif /* AV_GCC_VERSION_AT_MOST(4,0) */ |
| |
| #if AV_GCC_VERSION_AT_MOST(4,4) || defined(__INTEL_COMPILER) |
| #define av_bswap32 av_bswap32 |
| static av_always_inline av_const uint32_t av_bswap32(uint32_t x) |
| { |
| __asm__("bswap %0" : "+r" (x)); |
| return x; |
| } |
| |
| #if ARCH_X86_64 |
| #define av_bswap64 av_bswap64 |
| static inline uint64_t av_const av_bswap64(uint64_t x) |
| { |
| __asm__("bswap %0": "=r" (x) : "0" (x)); |
| return x; |
| } |
| #endif |
| #endif /* AV_GCC_VERSION_AT_MOST(4,4) */ |
| |
| #endif /* HAVE_INLINE_ASM */ |
| #endif /* AVUTIL_X86_BSWAP_H */ |