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proper calcs for nanoseconds

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This commit is contained in:
lizzie 2026-05-23 09:50:29 +00:00
parent c9c858a614
commit d04b9da170
5 changed files with 43 additions and 44 deletions
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32
src/common/wall_clock.cpp
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@ -20,55 +20,53 @@ namespace Common {
#if defined(ARCHITECTURE_x86_64)
WallClock::WallClock(bool invariant_, u64 rdtsc_frequency_) noexcept
: invariant{invariant_}
, rdtsc_frequency{rdtsc_frequency_}
, ns_rdtsc_factor{invariant_ ? 0 : GetFixedPoint64Factor(NsRatio::den, rdtsc_frequency_)}
, us_rdtsc_factor{invariant_ ? 0 : GetFixedPoint64Factor(UsRatio::den, rdtsc_frequency_)}
, ms_rdtsc_factor{invariant_ ? 0 : GetFixedPoint64Factor(MsRatio::den, rdtsc_frequency_)}
, cntpct_rdtsc_factor{invariant_ ? 0 : GetFixedPoint64Factor(CNTFRQ, rdtsc_frequency_)}
, gputick_rdtsc_factor{invariant_ ? 0 : GetFixedPoint64Factor(GPUTickFreq, rdtsc_frequency_)}
: rdtsc_frequency{rdtsc_frequency_}
, ns_rdtsc_factor{invariant_ ? GetFixedPoint64Factor(NsRatio::den, rdtsc_frequency_) : 0}
, us_rdtsc_factor{invariant_ ? GetFixedPoint64Factor(UsRatio::den, rdtsc_frequency_) : 0}
, ms_rdtsc_factor{invariant_ ? GetFixedPoint64Factor(MsRatio::den, rdtsc_frequency_) : 0}
, cntpct_rdtsc_factor{invariant_ ? GetFixedPoint64Factor(CNTFRQ, rdtsc_frequency_) : 0}
, gputick_rdtsc_factor{invariant_ ? GetFixedPoint64Factor(GPUTickFreq, rdtsc_frequency_) : 0}
, invariant{invariant_}
{}
std::chrono::nanoseconds WallClock::GetTimeNS() const {
if (invariant)
if (!invariant)
return std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::system_clock::now().time_since_epoch());
return std::chrono::nanoseconds{MultiplyHigh(GetUptime(), ns_rdtsc_factor)};
}
std::chrono::microseconds WallClock::GetTimeUS() const {
if (invariant)
if (!invariant)
return std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::system_clock::now().time_since_epoch());
return std::chrono::microseconds{MultiplyHigh(GetUptime(), us_rdtsc_factor)};
}
std::chrono::milliseconds WallClock::GetTimeMS() const {
if (invariant)
if (!invariant)
return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch());
return std::chrono::milliseconds{MultiplyHigh(GetUptime(), ms_rdtsc_factor)};
}
s64 WallClock::GetCNTPCT() const {
if (invariant)
if (!invariant)
return GetUptime() * NsToCNTPCTRatio::num / NsToCNTPCTRatio::den;
return MultiplyHigh(GetUptime(), cntpct_rdtsc_factor);
}
s64 WallClock::GetGPUTick() const {
if (invariant)
if (!invariant)
return GetUptime() * NsToGPUTickRatio::num / NsToGPUTickRatio::den;
return MultiplyHigh(GetUptime(), gputick_rdtsc_factor);
}
s64 WallClock::GetUptime() const {
if (invariant)
if (!invariant)
return std::chrono::duration_cast<std::chrono::nanoseconds>(std::chrono::steady_clock::now().time_since_epoch()).count();
return s64(Common::X64::FencedRDTSC());
}
bool WallClock::IsNative() const {
if (invariant)
return false;
return true;
return invariant;
}
#elif defined(HAS_NCE)
namespace {
@ -186,7 +184,7 @@ bool WallClock::IsNative() const {
WallClock CreateOptimalClock() noexcept {
#if defined(ARCHITECTURE_x86_64)
auto const& caps = GetCPUCaps();
return WallClock(!(caps.invariant_tsc && caps.tsc_frequency >= std::nano::den), caps.tsc_frequency);
return WallClock(caps.invariant_tsc && caps.tsc_frequency >= std::nano::den, caps.tsc_frequency);
#elif defined(HAS_NCE)
return WallClock(false, 1);
#else