/*
* copyright ( c ) 2006 Michael Niedermayer < michaelni @ gmx . at >
*
* This file is part of FFmpeg .
*
* FFmpeg is free software ; you can redistribute it and / or
* 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 .
*
* FFmpeg is distributed in the hope that it will be useful ,
* 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
* License along with FFmpeg ; if not , write to the Free Software
* 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>
#if HAVE_INLINE_ASM
#define FF_TIMER_UNITS "decicycles"
#define AV_READ_TIME read_time
static inline uint64_t read_time(void )
{
uint32_t a, d;
__asm__ volatile (
#if ARCH_X86_64 || defined (__SSE2__)
"lfence \n\t"
#endif
"rdtsc \n\t"
: "=a" (a), "=d" (d));
return ((uint64_t)d << 32 ) + a;
}
#elif HAVE_RDTSC
#include <intrin.h>
#define AV_READ_TIME __rdtsc
#endif /* HAVE_INLINE_ASM */
#endif /* AVUTIL_X86_TIMER_H */
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