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common: wall_clock: Utilize constants for ms, us, and ns ratios

This commit is contained in:
Morph 2022-01-30 12:36:56 -05:00
parent 11099dda2e
commit 4e766280c4
3 changed files with 9 additions and 5 deletions
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4
src/common/wall_clock.cpp
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@ -73,8 +73,8 @@ std::unique_ptr<WallClock> CreateBestMatchingClock(u32 emulated_cpu_frequency,
rtsc_frequency = EstimateRDTSCFrequency(); rtsc_frequency = EstimateRDTSCFrequency();
} }
// Fallback to StandardWallClock if rtsc period is higher than a nano second // Fallback to StandardWallClock if the hardware TSC does not have nanosecond precision.
if (rtsc_frequency <= 1000000000) { if (rtsc_frequency <= WallClock::NS_RATIO) {
return std::make_unique<StandardWallClock>(emulated_cpu_frequency, return std::make_unique<StandardWallClock>(emulated_cpu_frequency,
emulated_clock_frequency); emulated_clock_frequency);
} else { } else {

4
src/common/wall_clock.h
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@ -13,6 +13,10 @@ namespace Common {
class WallClock { class WallClock {
public: public:
static constexpr u64 NS_RATIO = 1'000'000'000;
static constexpr u64 US_RATIO = 1'000'000;
static constexpr u64 MS_RATIO = 1'000;
virtual ~WallClock() = default; virtual ~WallClock() = default;
/// Returns current wall time in nanoseconds /// Returns current wall time in nanoseconds

6
src/common/x64/native_clock.cpp
View File

@ -47,9 +47,9 @@ NativeClock::NativeClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequen
_mm_mfence(); _mm_mfence();
time_point.inner.last_measure = __rdtsc(); time_point.inner.last_measure = __rdtsc();
time_point.inner.accumulated_ticks = 0U; time_point.inner.accumulated_ticks = 0U;
ns_rtsc_factor = GetFixedPoint64Factor(1000000000, rtsc_frequency); ns_rtsc_factor = GetFixedPoint64Factor(NS_RATIO, rtsc_frequency);
us_rtsc_factor = GetFixedPoint64Factor(1000000, rtsc_frequency); us_rtsc_factor = GetFixedPoint64Factor(US_RATIO, rtsc_frequency);
ms_rtsc_factor = GetFixedPoint64Factor(1000, rtsc_frequency); ms_rtsc_factor = GetFixedPoint64Factor(MS_RATIO, rtsc_frequency);
clock_rtsc_factor = GetFixedPoint64Factor(emulated_clock_frequency, rtsc_frequency); clock_rtsc_factor = GetFixedPoint64Factor(emulated_clock_frequency, rtsc_frequency);
cpu_rtsc_factor = GetFixedPoint64Factor(emulated_cpu_frequency, rtsc_frequency); cpu_rtsc_factor = GetFixedPoint64Factor(emulated_cpu_frequency, rtsc_frequency);
} }