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Common: Refactor & Document Wall clock.

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This commit is contained in:
Fernando Sahmkow 2020-02-10 11:20:40 -04:00
parent 234b5ff6a9
commit e3524d1142
6 changed files with 50 additions and 51 deletions
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47
src/common/x64/native_clock.cpp
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@ -11,44 +11,11 @@
#include <x86intrin.h>
#endif
#include "common/uint128.h"
#include "common/x64/native_clock.h"
namespace Common {
#ifdef _MSC_VER
namespace {
struct uint128 {
u64 low;
u64 high;
};
u64 umuldiv64(u64 a, u64 b, u64 d) {
uint128 r{};
r.low = _umul128(a, b, &r.high);
u64 remainder;
return _udiv128(r.high, r.low, d, &remainder);
}
} // namespace
#else
namespace {
u64 umuldiv64(u64 a, u64 b, u64 d) {
const u64 diva = a / d;
const u64 moda = a % d;
const u64 divb = b / d;
const u64 modb = b % d;
return diva * b + moda * divb + moda * modb / d;
}
} // namespace
#endif
u64 EstimateRDTSCFrequency() {
const auto milli_10 = std::chrono::milliseconds{10};
// get current time
@ -70,7 +37,7 @@ u64 EstimateRDTSCFrequency() {
const u64 timer_diff =
std::chrono::duration_cast<std::chrono::nanoseconds>(endTime - startTime).count();
const u64 tsc_diff = tscEnd - tscStart;
const u64 tsc_freq = umuldiv64(tsc_diff, 1000000000ULL, timer_diff);
const u64 tsc_freq = MultiplyAndDivide64(tsc_diff, 1000000000ULL, timer_diff);
return tsc_freq;
}
@ -100,27 +67,27 @@ u64 NativeClock::GetRTSC() {
std::chrono::nanoseconds NativeClock::GetTimeNS() {
const u64 rtsc_value = GetRTSC();
return std::chrono::nanoseconds{umuldiv64(rtsc_value, 1000000000, rtsc_frequency)};
return std::chrono::nanoseconds{MultiplyAndDivide64(rtsc_value, 1000000000, rtsc_frequency)};
}
std::chrono::microseconds NativeClock::GetTimeUS() {
const u64 rtsc_value = GetRTSC();
return std::chrono::microseconds{umuldiv64(rtsc_value, 1000000, rtsc_frequency)};
return std::chrono::microseconds{MultiplyAndDivide64(rtsc_value, 1000000, rtsc_frequency)};
}
std::chrono::milliseconds NativeClock::GetTimeMS() {
const u64 rtsc_value = GetRTSC();
return std::chrono::milliseconds{umuldiv64(rtsc_value, 1000, rtsc_frequency)};
return std::chrono::milliseconds{MultiplyAndDivide64(rtsc_value, 1000, rtsc_frequency)};
}
u64 NativeClock::GetClockCycles() {
const u64 rtsc_value = GetRTSC();
return umuldiv64(rtsc_value, emulated_clock_frequency, rtsc_frequency);
return MultiplyAndDivide64(rtsc_value, emulated_clock_frequency, rtsc_frequency);
}
u64 NativeClock::GetCPUCycles() {
const u64 rtsc_value = GetRTSC();
return umuldiv64(rtsc_value, emulated_cpu_frequency, rtsc_frequency);
return MultiplyAndDivide64(rtsc_value, emulated_cpu_frequency, rtsc_frequency);
}
} // namespace X64