| /* |
| * 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 |
| */ |
| |
| #ifndef AVUTIL_ARM_BSWAP_H |
| #define AVUTIL_ARM_BSWAP_H |
| |
| #include <stdint.h> |
| #include "config.h" |
| #include "libavutil/attributes.h" |
| |
| #ifdef __ARMCC_VERSION |
| |
| #if HAVE_ARMV6 |
| #define av_bswap32 av_bswap32 |
| static av_always_inline av_const uint32_t av_bswap32(uint32_t x) |
| { |
| return __rev(x); |
| } |
| #endif /* HAVE_ARMV6 */ |
| |
| #elif HAVE_INLINE_ASM |
| |
| #if HAVE_ARMV6_INLINE |
| #define av_bswap16 av_bswap16 |
| static av_always_inline av_const unsigned av_bswap16(unsigned x) |
| { |
| __asm__("rev16 %0, %0" : "+r"(x)); |
| return x; |
| } |
| #endif |
| |
| #if AV_GCC_VERSION_AT_MOST(4,4) |
| #define av_bswap32 av_bswap32 |
| static av_always_inline av_const uint32_t av_bswap32(uint32_t x) |
| { |
| #if HAVE_ARMV6_INLINE |
| __asm__("rev %0, %0" : "+r"(x)); |
| #else |
| uint32_t t; |
| __asm__ ("eor %1, %0, %0, ror #16 \n\t" |
| "bic %1, %1, #0xFF0000 \n\t" |
| "mov %0, %0, ror #8 \n\t" |
| "eor %0, %0, %1, lsr #8 \n\t" |
| : "+r"(x), "=&r"(t)); |
| #endif /* HAVE_ARMV6_INLINE */ |
| return x; |
| } |
| #endif /* AV_GCC_VERSION_AT_MOST(4,4) */ |
| |
| #endif /* __ARMCC_VERSION */ |
| |
| #endif /* AVUTIL_ARM_BSWAP_H */ |