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early-access version 2252

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pineappleEA
2021-11-28 13:21:43 +01:00
parent faf5b13e48
commit 34d1231736
11 changed files with 162 additions and 109 deletions
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42
src/common/x64/native_clock.cpp
View File

@@ -8,7 +8,6 @@
#include <mutex>
#include <thread>
#include "common/atomic_ops.h"
#include "common/uint128.h"
#include "common/x64/native_clock.h"
@@ -44,12 +43,14 @@ NativeClock::NativeClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequen
u64 rtsc_frequency_)
: WallClock(emulated_cpu_frequency_, emulated_clock_frequency_, true), rtsc_frequency{
rtsc_frequency_} {
TimePoint new_time_point{};
_mm_mfence();
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);
new_time_point.last_measure = __rdtsc();
new_time_point.accumulated_ticks = 0U;
time_point.store(new_time_point);
ns_rtsc_factor = GetFixedPoint64Factor(1000'000'000ULL, rtsc_frequency);
us_rtsc_factor = GetFixedPoint64Factor(1000'000ULL, rtsc_frequency);
ms_rtsc_factor = GetFixedPoint64Factor(1000ULL, rtsc_frequency);
clock_rtsc_factor = GetFixedPoint64Factor(emulated_clock_frequency, rtsc_frequency);
cpu_rtsc_factor = GetFixedPoint64Factor(emulated_cpu_frequency, rtsc_frequency);
}
@@ -58,19 +59,19 @@ u64 NativeClock::GetRTSC() {
TimePoint new_time_point{};
TimePoint current_time_point{};
do {
current_time_point.pack = time_point.pack;
current_time_point = time_point.load(std::memory_order_acquire);
_mm_mfence();
const u64 current_measure = __rdtsc();
u64 diff = current_measure - current_time_point.inner.last_measure;
u64 diff = current_measure - current_time_point.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));
new_time_point.last_measure = current_measure > current_time_point.last_measure
? current_measure
: current_time_point.last_measure;
new_time_point.accumulated_ticks = current_time_point.accumulated_ticks + diff;
} while (!time_point.compare_exchange_weak(
current_time_point, new_time_point, std::memory_order_release, std::memory_order_relaxed));
/// The clock cannot be more precise than the guest timer, remove the lower bits
return new_time_point.inner.accumulated_ticks & inaccuracy_mask;
return new_time_point.accumulated_ticks & inaccuracy_mask;
}
void NativeClock::Pause(bool is_paused) {
@@ -78,12 +79,13 @@ void NativeClock::Pause(bool is_paused) {
TimePoint current_time_point{};
TimePoint new_time_point{};
do {
current_time_point.pack = time_point.pack;
new_time_point.pack = current_time_point.pack;
current_time_point = time_point.load(std::memory_order_acquire);
new_time_point = current_time_point;
_mm_mfence();
new_time_point.inner.last_measure = __rdtsc();
} while (!Common::AtomicCompareAndSwap(time_point.pack.data(), new_time_point.pack,
current_time_point.pack));
new_time_point.last_measure = __rdtsc();
} while (!time_point.compare_exchange_weak(current_time_point, new_time_point,
std::memory_order_release,
std::memory_order_relaxed));
}
}

13
src/common/x64/native_clock.h
View File

@@ -4,6 +4,7 @@
#pragma once
#include <atomic>
#include <optional>
#include "common/wall_clock.h"
@@ -31,13 +32,9 @@ public:
private:
u64 GetRTSC();
union alignas(16) TimePoint {
TimePoint() : pack{} {}
u128 pack{};
struct Inner {
u64 last_measure{};
u64 accumulated_ticks{};
} inner;
struct alignas(16) TimePoint {
u64 last_measure{};
u64 accumulated_ticks{};
};
/// value used to reduce the native clocks accuracy as some apss rely on
@@ -45,7 +42,7 @@ private:
/// be higher.
static constexpr u64 inaccuracy_mask = ~(UINT64_C(0x400) - 1);
TimePoint time_point;
std::atomic<TimePoint> time_point;
// factors
u64 clock_rtsc_factor{};
u64 cpu_rtsc_factor{};