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common/x64: Use TSC clock rate from CPUID when available

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The current method used to estimate the TSC is fairly accurate - within a few kHz - but the exact value can be extracted from CPUID if available.
This commit is contained in:
Marshall Mohror
2022-07-06 12:42:01 -05:00
parent 770611fdf3
commit b2ad4dd189
3 changed files with 19 additions and 1 deletions
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2
src/common/wall_clock.cpp
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@ -67,7 +67,7 @@ std::unique_ptr<WallClock> CreateBestMatchingClock(u64 emulated_cpu_frequency,
const auto& caps = GetCPUCaps();
u64 rtsc_frequency = 0;
if (caps.invariant_tsc) {
rtsc_frequency = EstimateRDTSCFrequency();
rtsc_frequency = caps.tsc_frequency ? caps.tsc_frequency : EstimateRDTSCFrequency();
}
// Fallback to StandardWallClock if the hardware TSC does not have the precision greater than: