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/*========================== begin_copyright_notice ============================
Copyright (C) 2019-2021 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#pragma once
#include "types.h"
#if defined _WIN32
# include <wtypes.h>
# include <winbase.h>
# include <intrin.h>
#else
# include <time.h>
# ifndef NSEC_PER_SEC
# define NSEC_PER_SEC 1000000000L
# endif
#endif
namespace iSTD
{
/*****************************************************************************\
Inline Function:
Pause
Description:
executes __asm pause
\*****************************************************************************/
__forceinline void Pause( void )
{
#if defined(_M_IX86) || defined (_M_AMD64) || \
defined(__i386__) || defined(__x86_64__)
_mm_pause();
#endif
}
#if defined _WIN32
/*****************************************************************************\
Inline Function:
GetTimestampCounter
Description:
Returns the number of CPU clock cycles since the last reset.
\*****************************************************************************/
__forceinline QWORD GetTimestampCounter( void )
{
#ifdef ISTDLIB_UMD
{
QWORD count = 0;
::QueryPerformanceCounter( (LARGE_INTEGER*)&count );
return count;
}
#else // !ISTDLIB_UMD
{
#ifdef _WIN64
{
return __rdtsc();
}
#else // !_WIN64
{
__asm rdtsc;
}
#endif // _WIN64
}
#endif // ISTDLIB_UMD
}
/*****************************************************************************\
Inline Function:
GetTimestampFrequency
Description:
Returns the frequency of the CPU clock cycles
\*****************************************************************************/
__forceinline QWORD GetTimestampFrequency( void )
{
#ifdef ISTDLIB_UMD
{
QWORD frequency = 0;
::QueryPerformanceFrequency( (LARGE_INTEGER*)&frequency );
return frequency;
}
#else // !ISTDLIB_UMD
{
// Note: Use the following for Conroe 2.4GHz
// return 2394050000;
return 0;
}
#endif // ISTDLIB_UMD
}
/*****************************************************************************\
Inline Function:
Wait
Description:
Waits for some number of milliseconds to complete
\*****************************************************************************/
__forceinline void Wait( const DWORD milliseconds )
{
const QWORD clocksPerSecond = GetTimestampFrequency();
const QWORD clocksPerMilliSecond = ( clocksPerSecond > 1000 ) ? clocksPerSecond / 1000 : 1;
const QWORD clocks = milliseconds * clocksPerMilliSecond;
const QWORD start = GetTimestampCounter();
while( clocks < ( GetTimestampCounter() - start ) )
{
Pause();
};
}
#else
/*****************************************************************************\
Inline Function:
GetTimestampCounter
Description:
Returns the value of high resolution performance counter
\*****************************************************************************/
__forceinline QWORD GetTimestampCounter( void )
{
struct timespec time;
clock_gettime(CLOCK_MONOTONIC, &time);
return (QWORD)time.tv_nsec +
(QWORD)time.tv_sec * (QWORD)NSEC_PER_SEC;
}
/*****************************************************************************\
Inline Function:
GetTimestampFrequency
Description:
Returns the frequency of high resolution performance counter.
On Linux/Android we use timer with nsec accuracy
\*****************************************************************************/
__forceinline QWORD GetTimestampFrequency( void )
{
return NSEC_PER_SEC;
}
#endif
} // iSTD
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