diff options
Diffstat (limited to 'src/common/wall_clock.cpp')
| -rw-r--r-- | src/common/wall_clock.cpp | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/src/common/wall_clock.cpp b/src/common/wall_clock.cpp index 49830b8ab..9acf7551e 100644 --- a/src/common/wall_clock.cpp +++ b/src/common/wall_clock.cpp @@ -65,14 +65,20 @@ private: #ifdef ARCHITECTURE_x86_64 -std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency, - u32 emulated_clock_frequency) { +std::unique_ptr<WallClock> CreateBestMatchingClock(u64 emulated_cpu_frequency, + u64 emulated_clock_frequency) { const auto& caps = GetCPUCaps(); u64 rtsc_frequency = 0; if (caps.invariant_tsc) { rtsc_frequency = EstimateRDTSCFrequency(); } - if (rtsc_frequency == 0) { + + // Fallback to StandardWallClock if the hardware TSC does not have the precision greater than: + // - A nanosecond + // - The emulated CPU frequency + // - The emulated clock counter frequency (CNTFRQ) + if (rtsc_frequency <= WallClock::NS_RATIO || rtsc_frequency <= emulated_cpu_frequency || + rtsc_frequency <= emulated_clock_frequency) { return std::make_unique<StandardWallClock>(emulated_cpu_frequency, emulated_clock_frequency); } else { @@ -83,8 +89,8 @@ std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency, #else -std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency, - u32 emulated_clock_frequency) { +std::unique_ptr<WallClock> CreateBestMatchingClock(u64 emulated_cpu_frequency, + u64 emulated_clock_frequency) { return std::make_unique<StandardWallClock>(emulated_cpu_frequency, emulated_clock_frequency); } |