void Detect ()
{
// General CPU identification
if (!_cpuid (&ID))
{
// Core.Fatal ("Fatal error: can't detect CPU/FPU.");
abort ();
}
// Timers & frequency
u64 start,end;
u32 dwStart,dwTest;
SetPriorityClass (GetCurrentProcess(),REALTIME_PRIORITY_CLASS);
// Detect Freq
dwTest = timeGetTime();
do { dwStart = timeGetTime(); } while (dwTest==dwStart);
start = GetCLK();
while (timeGetTime()-dwStart<1000) ;
end = GetCLK();
clk_per_second = end-start;
// Detect RDTSC Overhead
clk_overhead = 0;
u64 dummy = 0;
for (int i=0; i<256; i++) {
start = GetCLK();
clk_overhead += GetCLK()-start-dummy;
}
clk_overhead /= 256;
// Detect QPC Overhead
QueryPerformanceFrequency ((PLARGE_INTEGER)&qpc_freq) ;
qpc_overhead = 0;
for (int i=0; i<256; i++) {
start = QPC();
qpc_overhead += QPC()-start-dummy;
}
qpc_overhead /= 256;
SetPriorityClass (GetCurrentProcess(),NORMAL_PRIORITY_CLASS);
clk_per_second -= clk_overhead;
clk_per_milisec = clk_per_second/1000;
clk_per_microsec = clk_per_milisec/1000;
_control87 ( _PC_64, MCW_PC );
// _control87 ( _RC_CHOP, MCW_RC );
double a,b;
a = 1; b = double(clk_per_second);
clk_to_seconds = float(double(a/b));
a = 1000; b = double(clk_per_second);
clk_to_milisec = float(double(a/b));
a = 1000000;b = double(clk_per_second);
clk_to_microsec = float(double(a/b));
}
Timer::Timer()
: m_llStartTick(0)
{
if(!g_timeInitialized)
{
QPF(g_llPerfFrequency);
g_timeInitialized = true;
}
QPC(m_llStartTick);
}
double Timer::now()
{
LONGLONG now;
QPC(now);
return (((double)(now - m_llStartTick)/(double)g_llPerfFrequency) * 1000.0);
}
void Timer::reset()
{
QPC(m_llStartTick);
}
