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74 lines
1.9 KiB
74 lines
1.9 KiB
/* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVUTIL_ARM_BSWAP_H |
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#define AVUTIL_ARM_BSWAP_H |
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#include <stdint.h> |
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#include "config.h" |
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#include "libavutil/attributes.h" |
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#ifdef __ARMCC_VERSION |
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#if HAVE_ARMV6 |
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#define av_bswap16 av_bswap16 |
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static av_always_inline av_const unsigned av_bswap16(unsigned x) |
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{ |
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__asm { rev16 x, x } |
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return x; |
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} |
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#define av_bswap32 av_bswap32 |
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static av_always_inline av_const uint32_t av_bswap32(uint32_t x) |
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{ |
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return __rev(x); |
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} |
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#endif /* HAVE_ARMV6 */ |
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#elif HAVE_INLINE_ASM |
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#if HAVE_ARMV6 |
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#define av_bswap16 av_bswap16 |
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static av_always_inline av_const unsigned av_bswap16(unsigned x) |
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{ |
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__asm__("rev16 %0, %0" : "+r"(x)); |
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return x; |
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} |
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#endif |
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#if !AV_GCC_VERSION_AT_LEAST(4,5) |
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#define av_bswap32 av_bswap32 |
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static av_always_inline av_const uint32_t av_bswap32(uint32_t x) |
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{ |
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#if HAVE_ARMV6 |
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__asm__("rev %0, %0" : "+r"(x)); |
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#else |
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uint32_t t; |
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__asm__ ("eor %1, %0, %0, ror #16 \n\t" |
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"bic %1, %1, #0xFF0000 \n\t" |
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"mov %0, %0, ror #8 \n\t" |
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"eor %0, %0, %1, lsr #8 \n\t" |
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: "+r"(x), "=&r"(t)); |
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#endif /* HAVE_ARMV6 */ |
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return x; |
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} |
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#endif /* !AV_GCC_VERSION_AT_LEAST(4,5) */ |
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#endif /* __ARMCC_VERSION */ |
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#endif /* AVUTIL_ARM_BSWAP_H */
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