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2ecbf44f21
* commit 'd1a6cb195f610978ba5d2351e60f938f7f261d59': x86: Serialize rdtsc in read_time() Merged-by: Michael Niedermayer <michaelni@gmx.at>
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/*
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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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_X86_TIMER_H
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#define AVUTIL_X86_TIMER_H
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#include <stdint.h>
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#if HAVE_INLINE_ASM
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#define FF_TIMER_UNITS "decicycles"
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#define AV_READ_TIME read_time
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static inline uint64_t read_time(void)
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{
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uint32_t a, d;
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__asm__ volatile(
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#if ARCH_X86_64 || defined(__SSE2__)
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"lfence \n\t"
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#endif
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"rdtsc \n\t"
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: "=a" (a), "=d" (d));
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return ((uint64_t)d << 32) + a;
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}
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#elif HAVE_RDTSC
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#include <intrin.h>
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#define AV_READ_TIME __rdtsc
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#endif /* HAVE_INLINE_ASM */
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#endif /* AVUTIL_X86_TIMER_H */
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