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1ca3b62b10
This function causes several versions of armcc to miscompile code, and the performance impact is small. Signed-off-by: Mans Rullgard <mans@mansr.com>
68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/*
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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_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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