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