raze-gles/source/build/include/stats.h

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/*
** stats.h
**
**---------------------------------------------------------------------------
** Copyright 1998-2006 Randy Heit
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
#ifndef __STATS_H__
#define __STATS_H__
#if !defined _WIN32 && !defined __APPLE__
#ifdef NO_CLOCK_GETTIME
class cycle_t
{
public:
cycle_t &operator= (const cycle_t &o) { return *this; }
void Reset() {}
void Clock() {}
void Unclock() {}
double Time() { return 0; }
double TimeMS() { return 0; }
};
#else
#include <time.h>
class cycle_t
{
public:
void Reset()
{
Sec = 0;
}
void Clock()
{
timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
Sec -= ts.tv_sec + ts.tv_nsec * 1e-9;
}
void Unclock()
{
timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
Sec += ts.tv_sec + ts.tv_nsec * 1e-9;
}
double Time()
{
return Sec;
}
double TimeMS()
{
return Sec * 1e3;
}
private:
double Sec;
};
#endif
#else
// Windows and macOS
extern double PerfToSec, PerfToMillisec;
#ifdef _MSC_VER
// Trying to include intrin.h here results in some bizarre errors, so I'm just
// going to duplicate the function prototype instead.
//#include <intrin.h>
extern "C" unsigned __int64 __rdtsc(void);
#pragma intrinsic(__rdtsc)
inline unsigned __int64 rdtsc()
{
return __rdtsc();
}
#elif defined __APPLE__ && (defined __i386__ || defined __x86_64__)
inline uint64_t rdtsc()
{
return __builtin_ia32_rdtsc();
}
#else
inline uint64_t rdtsc()
{
#ifdef __amd64__
uint64_t tsc;
asm volatile ("rdtsc; shlq $32, %%rdx; orq %%rdx, %%rax" : "=a" (tsc) :: "%rdx");
return tsc;
#elif defined __ppc__
unsigned int lower, upper, temp;
do
{
asm volatile ("mftbu %0 \n mftb %1 \n mftbu %2 \n"
: "=r"(upper), "=r"(lower), "=r"(temp));
}
while (upper != temp);
return (static_cast<unsigned long long>(upper) << 32) | lower;
#else // i386
if (CPU.bRDTSC)
{
uint64_t tsc;
asm volatile ("\trdtsc\n" : "=A" (tsc));
return tsc;
}
return 0;
#endif // __amd64__
}
#endif
class cycle_t
{
public:
void Reset()
{
Counter = 0;
}
void Clock()
{
int64_t time = rdtsc();
Counter -= time;
}
void Unclock(bool checkvar = true)
{
int64_t time = rdtsc();
Counter += time;
}
double Time()
{
return Counter * PerfToSec;
}
double TimeMS()
{
return Counter * PerfToMillisec;
}
int64_t GetRawCounter()
{
return Counter;
}
private:
int64_t Counter;
};
#endif
// Helper for code that uses a timer and has multiple exit points.
class Clocker
{
public:
Clocker(cycle_t& clck)
: clock(clck)
{
clock.Clock();
}
~Clocker()
{ // unlock
clock.Unclock();
}
Clocker(const Clocker&) = delete;
Clocker& operator=(const Clocker&) = delete;
private:
cycle_t & clock;
};
#endif //__STATS_H__