timer.h 1.19 KB
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/*
 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
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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
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
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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
 * 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
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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
 */

#ifndef AVUTIL_X86_TIMER_H
#define AVUTIL_X86_TIMER_H

#include <stdint.h>

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#if HAVE_INLINE_ASM

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#define AV_READ_TIME read_time

static inline uint64_t read_time(void)
{
    uint32_t a, d;
    __asm__ volatile("rdtsc" : "=a" (a), "=d" (d));
    return ((uint64_t)d << 32) + a;
}

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#elif HAVE_RDTSC

#define AV_READ_TIME __rdtsc

#endif /* HAVE_INLINE_ASM */

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#endif /* AVUTIL_X86_TIMER_H */