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https://github.com/yuzu-emu/yuzu.git
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104 lines
3.2 KiB
C++
104 lines
3.2 KiB
C++
// Copyright 2020 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <chrono>
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#include <mutex>
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#include <thread>
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#ifdef _MSC_VER
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#include <intrin.h>
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#else
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#include <x86intrin.h>
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#endif
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#include "common/uint128.h"
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#include "common/x64/native_clock.h"
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namespace Common {
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u64 EstimateRDTSCFrequency() {
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const auto milli_10 = std::chrono::milliseconds{10};
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// get current time
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_mm_mfence();
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const u64 tscStart = __rdtsc();
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const auto startTime = std::chrono::high_resolution_clock::now();
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// wait roughly 3 seconds
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while (true) {
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auto milli = std::chrono::duration_cast<std::chrono::milliseconds>(
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std::chrono::high_resolution_clock::now() - startTime);
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if (milli.count() >= 3000)
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break;
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std::this_thread::sleep_for(milli_10);
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}
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const auto endTime = std::chrono::high_resolution_clock::now();
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_mm_mfence();
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const u64 tscEnd = __rdtsc();
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// calculate difference
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const u64 timer_diff =
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std::chrono::duration_cast<std::chrono::nanoseconds>(endTime - startTime).count();
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const u64 tsc_diff = tscEnd - tscStart;
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const u64 tsc_freq = MultiplyAndDivide64(tsc_diff, 1000000000ULL, timer_diff);
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return tsc_freq;
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}
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namespace X64 {
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NativeClock::NativeClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequency_,
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u64 rtsc_frequency_)
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: WallClock(emulated_cpu_frequency_, emulated_clock_frequency_, true), rtsc_frequency{
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rtsc_frequency_} {
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_mm_mfence();
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last_measure = __rdtsc();
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accumulated_ticks = 0U;
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}
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u64 NativeClock::GetRTSC() {
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std::scoped_lock scope{rtsc_serialize};
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_mm_mfence();
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const u64 current_measure = __rdtsc();
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u64 diff = current_measure - last_measure;
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diff = diff & ~static_cast<u64>(static_cast<s64>(diff) >> 63); // max(diff, 0)
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if (current_measure > last_measure) {
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last_measure = current_measure;
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}
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accumulated_ticks += diff;
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/// The clock cannot be more precise than the guest timer, remove the lower bits
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return accumulated_ticks & inaccuracy_mask;
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}
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void NativeClock::Pause(bool is_paused) {
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if (!is_paused) {
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_mm_mfence();
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last_measure = __rdtsc();
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}
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}
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std::chrono::nanoseconds NativeClock::GetTimeNS() {
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const u64 rtsc_value = GetRTSC();
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return std::chrono::nanoseconds{MultiplyAndDivide64(rtsc_value, 1000000000, rtsc_frequency)};
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}
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std::chrono::microseconds NativeClock::GetTimeUS() {
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const u64 rtsc_value = GetRTSC();
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return std::chrono::microseconds{MultiplyAndDivide64(rtsc_value, 1000000, rtsc_frequency)};
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}
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std::chrono::milliseconds NativeClock::GetTimeMS() {
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const u64 rtsc_value = GetRTSC();
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return std::chrono::milliseconds{MultiplyAndDivide64(rtsc_value, 1000, rtsc_frequency)};
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}
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u64 NativeClock::GetClockCycles() {
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const u64 rtsc_value = GetRTSC();
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return MultiplyAndDivide64(rtsc_value, emulated_clock_frequency, rtsc_frequency);
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}
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u64 NativeClock::GetCPUCycles() {
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const u64 rtsc_value = GetRTSC();
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return MultiplyAndDivide64(rtsc_value, emulated_cpu_frequency, rtsc_frequency);
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}
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} // namespace X64
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} // namespace Common
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