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authorMorph <39850852+Morph1984@users.noreply.github.com>2023-04-23 05:08:28 +0200
committerMorph <39850852+Morph1984@users.noreply.github.com>2023-06-08 03:44:42 +0200
commit1492a65454d6a03f641b136cc61e68870be00218 (patch)
tree5442ef0505fb075ee329a1a3cbb1be831987295e /src/common/x64
parentx64: Deduplicate RDTSC usage (diff)
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Diffstat (limited to '')
-rw-r--r--src/common/x64/native_clock.cpp165
-rw-r--r--src/common/x64/native_clock.h56
2 files changed, 40 insertions, 181 deletions
diff --git a/src/common/x64/native_clock.cpp b/src/common/x64/native_clock.cpp
index 277b00662..5d1eb0590 100644
--- a/src/common/x64/native_clock.cpp
+++ b/src/common/x64/native_clock.cpp
@@ -1,164 +1,45 @@
// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
-#include <array>
-#include <chrono>
-#include <thread>
-
-#include "common/atomic_ops.h"
-#include "common/steady_clock.h"
#include "common/uint128.h"
#include "common/x64/native_clock.h"
+#include "common/x64/rdtsc.h"
-#ifdef _MSC_VER
-#include <intrin.h>
-#endif
+namespace Common::X64 {
-namespace Common {
+NativeClock::NativeClock(u64 rdtsc_frequency_)
+ : start_ticks{FencedRDTSC()}, rdtsc_frequency{rdtsc_frequency_},
+ ns_rdtsc_factor{GetFixedPoint64Factor(NsRatio::den, rdtsc_frequency)},
+ us_rdtsc_factor{GetFixedPoint64Factor(UsRatio::den, rdtsc_frequency)},
+ ms_rdtsc_factor{GetFixedPoint64Factor(MsRatio::den, rdtsc_frequency)},
+ cntpct_rdtsc_factor{GetFixedPoint64Factor(CNTFRQ, rdtsc_frequency)} {}
-#ifdef _MSC_VER
-__forceinline static u64 FencedRDTSC() {
- _mm_lfence();
- _ReadWriteBarrier();
- const u64 result = __rdtsc();
- _mm_lfence();
- _ReadWriteBarrier();
- return result;
-}
-#else
-static u64 FencedRDTSC() {
- u64 eax;
- u64 edx;
- asm volatile("lfence\n\t"
- "rdtsc\n\t"
- "lfence\n\t"
- : "=a"(eax), "=d"(edx));
- return (edx << 32) | eax;
+std::chrono::nanoseconds NativeClock::GetTimeNS() const {
+ return std::chrono::nanoseconds{MultiplyHigh(GetHostTicksElapsed(), ns_rdtsc_factor)};
}
-#endif
-template <u64 Nearest>
-static u64 RoundToNearest(u64 value) {
- const auto mod = value % Nearest;
- return mod >= (Nearest / 2) ? (value - mod + Nearest) : (value - mod);
+std::chrono::microseconds NativeClock::GetTimeUS() const {
+ return std::chrono::microseconds{MultiplyHigh(GetHostTicksElapsed(), us_rdtsc_factor)};
}
-u64 EstimateRDTSCFrequency() {
- // Discard the first result measuring the rdtsc.
- FencedRDTSC();
- std::this_thread::sleep_for(std::chrono::milliseconds{1});
- FencedRDTSC();
-
- // Get the current time.
- const auto start_time = Common::RealTimeClock::Now();
- const u64 tsc_start = FencedRDTSC();
- // Wait for 250 milliseconds.
- std::this_thread::sleep_for(std::chrono::milliseconds{250});
- const auto end_time = Common::RealTimeClock::Now();
- const u64 tsc_end = FencedRDTSC();
- // Calculate differences.
- const u64 timer_diff = static_cast<u64>(
- std::chrono::duration_cast<std::chrono::nanoseconds>(end_time - start_time).count());
- const u64 tsc_diff = tsc_end - tsc_start;
- const u64 tsc_freq = MultiplyAndDivide64(tsc_diff, 1000000000ULL, timer_diff);
- return RoundToNearest<1000>(tsc_freq);
+std::chrono::milliseconds NativeClock::GetTimeMS() const {
+ return std::chrono::milliseconds{MultiplyHigh(GetHostTicksElapsed(), ms_rdtsc_factor)};
}
-namespace X64 {
-NativeClock::NativeClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequency_,
- u64 rtsc_frequency_)
- : WallClock(emulated_cpu_frequency_, emulated_clock_frequency_, true), rtsc_frequency{
- rtsc_frequency_} {
- // Thread to re-adjust the RDTSC frequency after 10 seconds has elapsed.
- time_sync_thread = std::jthread{[this](std::stop_token token) {
- // Get the current time.
- const auto start_time = Common::RealTimeClock::Now();
- const u64 tsc_start = FencedRDTSC();
- // Wait for 10 seconds.
- if (!Common::StoppableTimedWait(token, std::chrono::seconds{10})) {
- return;
- }
- const auto end_time = Common::RealTimeClock::Now();
- const u64 tsc_end = FencedRDTSC();
- // Calculate differences.
- const u64 timer_diff = static_cast<u64>(
- std::chrono::duration_cast<std::chrono::nanoseconds>(end_time - start_time).count());
- const u64 tsc_diff = tsc_end - tsc_start;
- const u64 tsc_freq = MultiplyAndDivide64(tsc_diff, 1000000000ULL, timer_diff);
- rtsc_frequency = tsc_freq;
- CalculateAndSetFactors();
- }};
-
- time_point.inner.last_measure = FencedRDTSC();
- time_point.inner.accumulated_ticks = 0U;
- CalculateAndSetFactors();
+u64 NativeClock::GetCNTPCT() const {
+ return MultiplyHigh(GetHostTicksElapsed(), cntpct_rdtsc_factor);
}
-u64 NativeClock::GetRTSC() {
- TimePoint new_time_point{};
- TimePoint current_time_point{};
-
- current_time_point.pack = Common::AtomicLoad128(time_point.pack.data());
- do {
- const u64 current_measure = FencedRDTSC();
- 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, current_time_point.pack));
- return new_time_point.inner.accumulated_ticks;
+u64 NativeClock::GetHostTicksNow() const {
+ return FencedRDTSC();
}
-void NativeClock::Pause(bool is_paused) {
- if (!is_paused) {
- TimePoint current_time_point{};
- TimePoint new_time_point{};
-
- current_time_point.pack = Common::AtomicLoad128(time_point.pack.data());
- do {
- new_time_point.pack = current_time_point.pack;
- new_time_point.inner.last_measure = FencedRDTSC();
- } while (!Common::AtomicCompareAndSwap(time_point.pack.data(), new_time_point.pack,
- current_time_point.pack, current_time_point.pack));
- }
-}
-
-std::chrono::nanoseconds NativeClock::GetTimeNS() {
- const u64 rtsc_value = GetRTSC();
- return std::chrono::nanoseconds{MultiplyHigh(rtsc_value, ns_rtsc_factor)};
+u64 NativeClock::GetHostTicksElapsed() const {
+ return FencedRDTSC() - start_ticks;
}
-std::chrono::microseconds NativeClock::GetTimeUS() {
- const u64 rtsc_value = GetRTSC();
- return std::chrono::microseconds{MultiplyHigh(rtsc_value, us_rtsc_factor)};
+bool NativeClock::IsNative() const {
+ return true;
}
-std::chrono::milliseconds NativeClock::GetTimeMS() {
- const u64 rtsc_value = GetRTSC();
- return std::chrono::milliseconds{MultiplyHigh(rtsc_value, ms_rtsc_factor)};
-}
-
-u64 NativeClock::GetClockCycles() {
- const u64 rtsc_value = GetRTSC();
- return MultiplyHigh(rtsc_value, clock_rtsc_factor);
-}
-
-u64 NativeClock::GetCPUCycles() {
- const u64 rtsc_value = GetRTSC();
- return MultiplyHigh(rtsc_value, cpu_rtsc_factor);
-}
-
-void NativeClock::CalculateAndSetFactors() {
- ns_rtsc_factor = GetFixedPoint64Factor(NS_RATIO, rtsc_frequency);
- us_rtsc_factor = GetFixedPoint64Factor(US_RATIO, rtsc_frequency);
- ms_rtsc_factor = GetFixedPoint64Factor(MS_RATIO, rtsc_frequency);
- clock_rtsc_factor = GetFixedPoint64Factor(emulated_clock_frequency, rtsc_frequency);
- cpu_rtsc_factor = GetFixedPoint64Factor(emulated_cpu_frequency, rtsc_frequency);
-}
-
-} // namespace X64
-
-} // namespace Common
+} // namespace Common::X64
diff --git a/src/common/x64/native_clock.h b/src/common/x64/native_clock.h
index 03ca291d8..d6f8626c1 100644
--- a/src/common/x64/native_clock.h
+++ b/src/common/x64/native_clock.h
@@ -3,58 +3,36 @@
#pragma once
-#include "common/polyfill_thread.h"
#include "common/wall_clock.h"
-namespace Common {
+namespace Common::X64 {
-namespace X64 {
class NativeClock final : public WallClock {
public:
- explicit NativeClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequency_,
- u64 rtsc_frequency_);
+ explicit NativeClock(u64 rdtsc_frequency_);
- std::chrono::nanoseconds GetTimeNS() override;
+ std::chrono::nanoseconds GetTimeNS() const override;
- std::chrono::microseconds GetTimeUS() override;
+ std::chrono::microseconds GetTimeUS() const override;
- std::chrono::milliseconds GetTimeMS() override;
+ std::chrono::milliseconds GetTimeMS() const override;
- u64 GetClockCycles() override;
+ u64 GetCNTPCT() const override;
- u64 GetCPUCycles() override;
+ u64 GetHostTicksNow() const override;
- void Pause(bool is_paused) override;
+ u64 GetHostTicksElapsed() const override;
-private:
- u64 GetRTSC();
-
- void CalculateAndSetFactors();
-
- union alignas(16) TimePoint {
- TimePoint() : pack{} {}
- u128 pack{};
- struct Inner {
- u64 last_measure{};
- u64 accumulated_ticks{};
- } inner;
- };
-
- TimePoint time_point;
+ bool IsNative() const override;
- // factors
- u64 clock_rtsc_factor{};
- u64 cpu_rtsc_factor{};
- u64 ns_rtsc_factor{};
- u64 us_rtsc_factor{};
- u64 ms_rtsc_factor{};
-
- u64 rtsc_frequency;
+private:
+ u64 start_ticks;
+ u64 rdtsc_frequency;
- std::jthread time_sync_thread;
+ u64 ns_rdtsc_factor;
+ u64 us_rdtsc_factor;
+ u64 ms_rdtsc_factor;
+ u64 cntpct_rdtsc_factor;
};
-} // namespace X64
-
-u64 EstimateRDTSCFrequency();
-} // namespace Common
+} // namespace Common::X64