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ffmpeg / libavutil / arm / bswap.h @ 80a07f6e

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/*
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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/common.h"
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#ifdef __ARMCC_VERSION
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#if HAVE_ARMV6
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#define bswap_16 bswap_16
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static av_always_inline av_const uint16_t bswap_16(uint16_t 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 bswap_32 bswap_32
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static av_always_inline av_const uint32_t bswap_32(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 bswap_16 bswap_16
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static av_always_inline av_const uint16_t bswap_16(uint16_t 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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#define bswap_32 bswap_32
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static av_always_inline av_const uint32_t bswap_32(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 /* __ARMCC_VERSION */
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#endif /* AVUTIL_ARM_BSWAP_H */