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common: wall_clock: Check precision against the emulated CPU and CNTFRQ
In addition to requiring nanosecond precision, using the native clock requires that the hardware TSC has a precision greater than the emulated CPU and its clock counter.
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@ -65,16 +65,20 @@ private:
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#ifdef ARCHITECTURE_x86_64
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#ifdef ARCHITECTURE_x86_64
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std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency,
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std::unique_ptr<WallClock> CreateBestMatchingClock(u64 emulated_cpu_frequency,
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u32 emulated_clock_frequency) {
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u64 emulated_clock_frequency) {
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const auto& caps = GetCPUCaps();
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const auto& caps = GetCPUCaps();
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u64 rtsc_frequency = 0;
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u64 rtsc_frequency = 0;
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if (caps.invariant_tsc) {
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if (caps.invariant_tsc) {
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rtsc_frequency = EstimateRDTSCFrequency();
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rtsc_frequency = EstimateRDTSCFrequency();
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}
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}
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// Fallback to StandardWallClock if the hardware TSC does not have nanosecond precision.
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// Fallback to StandardWallClock if the hardware TSC does not have the precision greater than:
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if (rtsc_frequency <= WallClock::NS_RATIO) {
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// - A nanosecond
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// - The emulated CPU frequency
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// - The emulated clock counter frequency (CNTFRQ)
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if (rtsc_frequency <= WallClock::NS_RATIO || rtsc_frequency <= emulated_cpu_frequency ||
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rtsc_frequency <= emulated_clock_frequency) {
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return std::make_unique<StandardWallClock>(emulated_cpu_frequency,
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return std::make_unique<StandardWallClock>(emulated_cpu_frequency,
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emulated_clock_frequency);
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emulated_clock_frequency);
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} else {
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} else {
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@ -85,8 +89,8 @@ std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency,
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#else
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#else
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std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency,
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std::unique_ptr<WallClock> CreateBestMatchingClock(u64 emulated_cpu_frequency,
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u32 emulated_clock_frequency) {
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u64 emulated_clock_frequency) {
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return std::make_unique<StandardWallClock>(emulated_cpu_frequency, 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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}
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@ -53,7 +53,7 @@ private:
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bool is_native;
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bool is_native;
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};
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};
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[[nodiscard]] std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency,
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[[nodiscard]] std::unique_ptr<WallClock> CreateBestMatchingClock(u64 emulated_cpu_frequency,
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u32 emulated_clock_frequency);
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u64 emulated_clock_frequency);
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} // namespace Common
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} // namespace Common
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