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// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "common/steady_clock.h"
#include "common/wall_clock.h"
#ifdef ARCHITECTURE_x86_64
#include "common/x64/cpu_detect.h"
#include "common/x64/native_clock.h"
#include "common/x64/rdtsc.h"
#endif
#ifdef HAS_NCE
#include "common/arm64/native_clock.h"
#endif
namespace Common {
class StandardWallClock final : public WallClock {
public:
explicit StandardWallClock() {}
void Reset() override {
start_time = std::chrono::system_clock::now();
}
std::chrono::nanoseconds GetTimeNS() const override {
return std::chrono::duration_cast<std::chrono::nanoseconds>(
std::chrono::system_clock::now().time_since_epoch());
}
std::chrono::microseconds GetTimeUS() const override {
return std::chrono::duration_cast<std::chrono::microseconds>(
std::chrono::system_clock::now().time_since_epoch());
}
std::chrono::milliseconds GetTimeMS() const override {
return std::chrono::duration_cast<std::chrono::milliseconds>(
std::chrono::system_clock::now().time_since_epoch());
}
s64 GetCNTPCT() const override {
return GetUptime() * NsToCNTPCTRatio::num / NsToCNTPCTRatio::den;
}
s64 GetGPUTick() const override {
return GetUptime() * NsToGPUTickRatio::num / NsToGPUTickRatio::den;
}
s64 GetUptime() const override {
return std::chrono::duration_cast<std::chrono::nanoseconds>(
std::chrono::system_clock::now() - start_time)
.count();
}
bool IsNative() const override {
return false;
}
private:
std::chrono::system_clock::time_point start_time{};
};
std::unique_ptr<WallClock> CreateOptimalClock() {
#if defined(ARCHITECTURE_x86_64)
const auto& caps = GetCPUCaps();
if (caps.invariant_tsc && caps.tsc_frequency >= std::nano::den) {
return std::make_unique<X64::NativeClock>(caps.tsc_frequency);
} else {
// Fallback to StandardWallClock if the hardware TSC
// - Is not invariant
// - Is not more precise than 1 GHz (1ns resolution)
return std::make_unique<StandardWallClock>();
}
#elif defined(HAS_NCE)
return std::make_unique<Arm64::NativeClock>();
#else
return std::make_unique<StandardWallClock>();
#endif
}
std::unique_ptr<WallClock> CreateStandardWallClock() {
return std::make_unique<StandardWallClock>();
}
} // namespace Common
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