diff options
Diffstat (limited to 'ffmpeg_files/arm/bswap.h')
-rw-r--r-- | ffmpeg_files/arm/bswap.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/ffmpeg_files/arm/bswap.h b/ffmpeg_files/arm/bswap.h new file mode 100644 index 0000000000..98147449b1 --- /dev/null +++ b/ffmpeg_files/arm/bswap.h @@ -0,0 +1,72 @@ +/* + * 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 MP_AVUTIL_ARM_BSWAP_H +#define MP_AVUTIL_ARM_BSWAP_H + +#include <stdint.h> +#include "config.h" +#include "libavutil/common.h" + +#ifdef __ARMCC_VERSION + +#if HAVE_ARMV6 +#define bswap_16 bswap_16 +static av_always_inline av_const uint16_t bswap_16(uint16_t x) +{ + __asm { rev16 x, x } + return x; +} + +#define bswap_32 bswap_32 +static av_always_inline av_const uint32_t bswap_32(uint32_t x) +{ + return __rev(x); +} +#endif /* HAVE_ARMV6 */ + +#elif HAVE_INLINE_ASM + +#if HAVE_ARMV6 +#define bswap_16 bswap_16 +static av_always_inline av_const uint16_t bswap_16(uint16_t x) +{ + __asm__("rev16 %0, %0" : "+r"(x)); + return x; +} +#endif + +#define bswap_32 bswap_32 +static av_always_inline av_const uint32_t bswap_32(uint32_t x) +{ +#if HAVE_ARMV6 + __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 */ + return x; +} + +#endif /* __ARMCC_VERSION */ + +#endif /* AVUTIL_ARM_BSWAP_H */ |