88 lines
2.9 KiB
C++
88 lines
2.9 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 "common/uint128.h"
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#include "common/wall_clock.h"
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#ifdef ARCHITECTURE_x86_64
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#include "common/x64/cpu_detect.h"
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#include "common/x64/native_clock.h"
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#endif
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namespace Common {
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using base_timer = std::chrono::steady_clock;
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using base_time_point = std::chrono::time_point<base_timer>;
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class StandardWallClock : public WallClock {
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public:
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StandardWallClock(u64 emulated_cpu_frequency, u64 emulated_clock_frequency)
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: WallClock(emulated_cpu_frequency, emulated_clock_frequency, false) {
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start_time = base_timer::now();
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}
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std::chrono::nanoseconds GetTimeNS() override {
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base_time_point current = base_timer::now();
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auto elapsed = current - start_time;
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return std::chrono::duration_cast<std::chrono::nanoseconds>(elapsed);
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}
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std::chrono::microseconds GetTimeUS() override {
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base_time_point current = base_timer::now();
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auto elapsed = current - start_time;
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return std::chrono::duration_cast<std::chrono::microseconds>(elapsed);
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}
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std::chrono::milliseconds GetTimeMS() override {
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base_time_point current = base_timer::now();
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auto elapsed = current - start_time;
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return std::chrono::duration_cast<std::chrono::milliseconds>(elapsed);
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}
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u64 GetClockCycles() override {
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std::chrono::nanoseconds time_now = GetTimeNS();
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const u128 temporal = Common::Multiply64Into128(time_now.count(), emulated_clock_frequency);
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return Common::Divide128On32(temporal, 1000000000).first;
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}
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u64 GetCPUCycles() override {
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std::chrono::nanoseconds time_now = GetTimeNS();
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const u128 temporal = Common::Multiply64Into128(time_now.count(), emulated_cpu_frequency);
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return Common::Divide128On32(temporal, 1000000000).first;
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}
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private:
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base_time_point start_time;
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};
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#ifdef ARCHITECTURE_x86_64
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std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency, u32 emulated_clock_frequency) {
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const auto& caps = GetCPUCaps();
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u64 rtsc_frequency = 0;
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if (caps.invariant_tsc) {
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if (caps.base_frequency != 0) {
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rtsc_frequency = static_cast<u64>(caps.base_frequency) * 1000000U;
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}
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if (rtsc_frequency == 0) {
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rtsc_frequency = EstimateRDTSCFrequency();
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}
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}
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if (rtsc_frequency == 0) {
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return std::make_unique<StandardWallClock>(emulated_cpu_frequency, emulated_clock_frequency);
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} else {
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return std::make_unique<X64::NativeClock>(emulated_cpu_frequency, emulated_clock_frequency, rtsc_frequency);
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}
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}
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#else
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std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency, u32 emulated_clock_frequency) {
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return std::make_unique<StandardWallClock>(emulated_cpu_frequency, emulated_clock_frequency);
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}
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#endif
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} // namespace Common
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