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#pragma once
#include <util/system/defaults.h>
#include <util/system/hp_timer.h>
#include <util/system/platform.h>
#if defined(_win_)
#include <intrin.h>
#pragma intrinsic(__rdtsc)
#endif // _win_
#if defined(_darwin_) && !defined(_x86_)
#include <mach/mach_time.h>
#endif
// GetCycleCount() from util/system/datetime.h uses rdtscp, which is more accurate than rdtsc,
// but rdtscp disables processor's out-of-order execution, so it can be slow
Y_FORCE_INLINE ui64 GetCycleCountFast() {
#if defined(_MSC_VER)
// Generates the rdtsc instruction, which returns the processor time stamp.
// The processor time stamp records the number of clock cycles since the last reset.
return __rdtsc();
#elif defined(__clang__) && !defined(_arm64_)
return __builtin_readcyclecounter();
#elif defined(_x86_64_)
unsigned hi, lo;
__asm__ __volatile__("rdtsc"
: "=a"(lo), "=d"(hi));
return ((unsigned long long)lo) | (((unsigned long long)hi) << 32);
#elif defined(_i386_)
ui64 x;
__asm__ volatile("rdtsc\n\t"
: "=A"(x));
return x;
#elif defined(_darwin_)
return mach_absolute_time();
#elif defined(_arm32_)
return MicroSeconds();
#elif defined(_arm64_)
ui64 x;
__asm__ __volatile__("isb; mrs %0, cntvct_el0"
: "=r"(x));
return x;
#else
#error "unsupported arch"
#endif
}
// NHPTimer::GetTime fast analog
Y_FORCE_INLINE void GetTimeFast(NHPTimer::STime* pTime) noexcept {
*pTime = GetCycleCountFast();
}
namespace NActors {
inline double Ts2Ns(ui64 ts) {
return NHPTimer::GetSeconds(ts) * 1e9;
}
inline double Ts2Us(ui64 ts) {
return NHPTimer::GetSeconds(ts) * 1e6;
}
inline double Ts2Ms(ui64 ts) {
return NHPTimer::GetSeconds(ts) * 1e3;
}
inline ui64 Us2Ts(double us) {
return ui64(NHPTimer::GetClockRate() * us / 1e6);
}
struct TTimeTracker {
ui64 Ts;
TTimeTracker(): Ts(GetCycleCountFast()) {}
ui64 Elapsed() {
ui64 ts = GetCycleCountFast();
std::swap(Ts, ts);
return Ts - ts;
}
};
}
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