diff options
Diffstat (limited to 'src/common/x64/native_clock.cpp')
| -rw-r--r-- | src/common/x64/native_clock.cpp | 41 |
1 files changed, 27 insertions, 14 deletions
diff --git a/src/common/x64/native_clock.cpp b/src/common/x64/native_clock.cpp index e246432d0..a65f6b832 100644 --- a/src/common/x64/native_clock.cpp +++ b/src/common/x64/native_clock.cpp @@ -17,6 +17,7 @@ #include <x86intrin.h> #endif +#include "common/atomic_ops.h" #include "common/uint128.h" #include "common/x64/native_clock.h" @@ -102,8 +103,8 @@ NativeClock::NativeClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequen : WallClock(emulated_cpu_frequency_, emulated_clock_frequency_, true), rtsc_frequency{ rtsc_frequency_} { _mm_mfence(); - last_measure = __rdtsc(); - accumulated_ticks = 0U; + time_point.inner.last_measure = __rdtsc(); + time_point.inner.accumulated_ticks = 0U; ns_rtsc_factor = GetFixedPoint64Factor(1000000000, rtsc_frequency); us_rtsc_factor = GetFixedPoint64Factor(1000000, rtsc_frequency); ms_rtsc_factor = GetFixedPoint64Factor(1000, rtsc_frequency); @@ -112,23 +113,35 @@ NativeClock::NativeClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequen } u64 NativeClock::GetRTSC() { - std::scoped_lock scope{rtsc_serialize}; - _mm_mfence(); - const u64 current_measure = __rdtsc(); - u64 diff = current_measure - last_measure; - diff = diff & ~static_cast<u64>(static_cast<s64>(diff) >> 63); // max(diff, 0) - if (current_measure > last_measure) { - last_measure = current_measure; - } - accumulated_ticks += diff; + TimePoint new_time_point{}; + TimePoint current_time_point{}; + do { + current_time_point.pack = time_point.pack; + _mm_mfence(); + const u64 current_measure = __rdtsc(); + u64 diff = current_measure - current_time_point.inner.last_measure; + diff = diff & ~static_cast<u64>(static_cast<s64>(diff) >> 63); // max(diff, 0) + new_time_point.inner.last_measure = current_measure > current_time_point.inner.last_measure + ? current_measure + : current_time_point.inner.last_measure; + new_time_point.inner.accumulated_ticks = current_time_point.inner.accumulated_ticks + diff; + } while (!Common::AtomicCompareAndSwap(time_point.pack.data(), new_time_point.pack, + current_time_point.pack)); /// The clock cannot be more precise than the guest timer, remove the lower bits - return accumulated_ticks & inaccuracy_mask; + return new_time_point.inner.accumulated_ticks & inaccuracy_mask; } void NativeClock::Pause(bool is_paused) { if (!is_paused) { - _mm_mfence(); - last_measure = __rdtsc(); + TimePoint current_time_point{}; + TimePoint new_time_point{}; + do { + current_time_point.pack = time_point.pack; + new_time_point.pack = current_time_point.pack; + _mm_mfence(); + new_time_point.inner.last_measure = __rdtsc(); + } while (!Common::AtomicCompareAndSwap(time_point.pack.data(), new_time_point.pack, + current_time_point.pack)); } } |