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RDTSC-based cycle_t for macOS

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Windows and macOS now share most of related code
Old implementation using mach_absolute_time() was more precise (at least in theory) but too costly
This commit is contained in:
alexey.lysiuk 2017-01-31 15:56:58 +02:00
parent 6225f60eb2
commit 1cdfcb4935
3 changed files with 22 additions and 83 deletions
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21
src/posix/cocoa/i_system.mm
View file

@ -36,6 +36,7 @@
#include <fnmatch.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include "d_ticcmd.h"
#include "doomdef.h"
@ -98,9 +99,29 @@ void SetLanguageIDs()
void I_InitTimer();
void I_ShutdownTimer();
double PerfToSec, PerfToMillisec;
static void CalculateCPUSpeed()
{
long long frequency;
size_t size = sizeof frequency;
if (0 == sysctlbyname("machdep.tsc.frequency", &frequency, &size, nullptr, 0) && 0 != frequency)
{
PerfToSec = 1.0 / frequency;
PerfToMillisec = 1000.0 / frequency;
if (!batchrun)
{
Printf("CPU speed: %.0f MHz\n", 0.001 / PerfToMillisec);
}
}
}
void I_Init(void)
{
CheckCPUID(&CPU);
CalculateCPUSpeed();
DumpCPUInfo(&CPU);
atterm(I_ShutdownSound);

9
src/stats.cpp
View file

@ -42,15 +42,6 @@
#include "m_swap.h"
#include "sbar.h"
#if defined (__APPLE__)
mach_timebase_info_data_t cycle_t::s_info;
bool cycle_t::s_initialized;
#endif // __APPLE__
FStat *FStat::FirstStat;
FStat::FStat (const char *name)

75
src/stats.h
View file

@ -36,78 +36,7 @@
#include "zstring.h"
#ifndef _WIN32
#if defined (__APPLE__)
#include <mach/mach_time.h>
class cycle_t
{
public:
cycle_t()
{
if ( !s_initialized )
{
mach_timebase_info( &s_info );
s_initialized = true;
}
Reset();
}
cycle_t &operator=( const cycle_t &other )
{
if ( &other != this )
{
m_seconds = other.m_seconds;
}
return *this;
}
void Reset()
{
m_seconds = 0;
}
void Clock()
{
m_seconds -= Nanoseconds() * 1e-9;
}
void Unclock()
{
m_seconds += Nanoseconds() * 1e-9;
}
double Time()
{
return m_seconds;
}
double TimeMS()
{
return m_seconds * 1e3;
}
private:
double m_seconds;
static mach_timebase_info_data_t s_info;
static bool s_initialized;
uint64_t Nanoseconds() const
{
return mach_absolute_time() * s_info.numer / s_info.denom;
}
};
#else // !__APPLE__
#if !defined _WIN32 && !defined __APPLE__
#ifdef NO_CLOCK_GETTIME
class cycle_t
@ -171,8 +100,6 @@ private:
#endif
#endif // __APPLE__
#else
// Windows