forked from suyu/suyu
core: core_timing_util: Optimize core timing math.
- Avoids a lot of unnecessary 128-bit math for imperceptible accuracy.
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bunnei
parent
592a649918
commit
f3345e84ad
3 changed files with 47 additions and 97 deletions
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@ -19,7 +19,6 @@ add_library(core STATIC
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core.h
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core_timing.cpp
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core_timing.h
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core_timing_util.cpp
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core_timing_util.h
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cpu_manager.cpp
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cpu_manager.h
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@ -1,84 +0,0 @@
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// Copyright 2008 Dolphin Emulator Project / 2017 Citra Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#include "core/core_timing_util.h"
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#include <cinttypes>
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#include <limits>
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#include "common/logging/log.h"
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#include "common/uint128.h"
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#include "core/hardware_properties.h"
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namespace Core::Timing {
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constexpr u64 MAX_VALUE_TO_MULTIPLY = std::numeric_limits<s64>::max() / Hardware::BASE_CLOCK_RATE;
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s64 msToCycles(std::chrono::milliseconds ms) {
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if (static_cast<u64>(ms.count() / 1000) > MAX_VALUE_TO_MULTIPLY) {
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LOG_ERROR(Core_Timing, "Integer overflow, use max value");
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return std::numeric_limits<s64>::max();
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}
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if (static_cast<u64>(ms.count()) > MAX_VALUE_TO_MULTIPLY) {
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LOG_DEBUG(Core_Timing, "Time very big, do rounding");
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return Hardware::BASE_CLOCK_RATE * (ms.count() / 1000);
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}
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return (Hardware::BASE_CLOCK_RATE * ms.count()) / 1000;
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}
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s64 usToCycles(std::chrono::microseconds us) {
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if (static_cast<u64>(us.count() / 1000000) > MAX_VALUE_TO_MULTIPLY) {
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LOG_ERROR(Core_Timing, "Integer overflow, use max value");
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return std::numeric_limits<s64>::max();
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}
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if (static_cast<u64>(us.count()) > MAX_VALUE_TO_MULTIPLY) {
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LOG_DEBUG(Core_Timing, "Time very big, do rounding");
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return Hardware::BASE_CLOCK_RATE * (us.count() / 1000000);
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}
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return (Hardware::BASE_CLOCK_RATE * us.count()) / 1000000;
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}
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s64 nsToCycles(std::chrono::nanoseconds ns) {
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const u128 temporal = Common::Multiply64Into128(ns.count(), Hardware::BASE_CLOCK_RATE);
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return Common::Divide128On32(temporal, static_cast<u32>(1000000000)).first;
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}
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u64 msToClockCycles(std::chrono::milliseconds ns) {
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const u128 temp = Common::Multiply64Into128(ns.count(), Hardware::CNTFREQ);
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return Common::Divide128On32(temp, 1000).first;
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}
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u64 usToClockCycles(std::chrono::microseconds ns) {
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const u128 temp = Common::Multiply64Into128(ns.count(), Hardware::CNTFREQ);
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return Common::Divide128On32(temp, 1000000).first;
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}
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u64 nsToClockCycles(std::chrono::nanoseconds ns) {
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const u128 temp = Common::Multiply64Into128(ns.count(), Hardware::CNTFREQ);
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return Common::Divide128On32(temp, 1000000000).first;
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}
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u64 CpuCyclesToClockCycles(u64 ticks) {
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const u128 temporal = Common::Multiply64Into128(ticks, Hardware::CNTFREQ);
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return Common::Divide128On32(temporal, static_cast<u32>(Hardware::BASE_CLOCK_RATE)).first;
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}
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std::chrono::milliseconds CyclesToMs(s64 cycles) {
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const u128 temporal = Common::Multiply64Into128(cycles, 1000);
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u64 ms = Common::Divide128On32(temporal, static_cast<u32>(Hardware::BASE_CLOCK_RATE)).first;
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return std::chrono::milliseconds(ms);
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}
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std::chrono::nanoseconds CyclesToNs(s64 cycles) {
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const u128 temporal = Common::Multiply64Into128(cycles, 1000000000);
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u64 ns = Common::Divide128On32(temporal, static_cast<u32>(Hardware::BASE_CLOCK_RATE)).first;
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return std::chrono::nanoseconds(ns);
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}
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std::chrono::microseconds CyclesToUs(s64 cycles) {
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const u128 temporal = Common::Multiply64Into128(cycles, 1000000);
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u64 us = Common::Divide128On32(temporal, static_cast<u32>(Hardware::BASE_CLOCK_RATE)).first;
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return std::chrono::microseconds(us);
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}
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} // namespace Core::Timing
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@ -1,24 +1,59 @@
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// Copyright 2008 Dolphin Emulator Project / 2017 Citra Emulator Project
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// Licensed under GPLv2+
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// Copyright 2020 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <chrono>
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#include "common/common_types.h"
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#include "core/hardware_properties.h"
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namespace Core::Timing {
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s64 msToCycles(std::chrono::milliseconds ms);
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s64 usToCycles(std::chrono::microseconds us);
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s64 nsToCycles(std::chrono::nanoseconds ns);
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u64 msToClockCycles(std::chrono::milliseconds ns);
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u64 usToClockCycles(std::chrono::microseconds ns);
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u64 nsToClockCycles(std::chrono::nanoseconds ns);
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std::chrono::milliseconds CyclesToMs(s64 cycles);
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std::chrono::nanoseconds CyclesToNs(s64 cycles);
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std::chrono::microseconds CyclesToUs(s64 cycles);
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namespace detail {
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constexpr u64 CNTFREQ_ADJUSTED = Hardware::CNTFREQ / 1000;
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constexpr u64 BASE_CLOCK_RATE_ADJUSTED = Hardware::BASE_CLOCK_RATE / 1000;
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} // namespace detail
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u64 CpuCyclesToClockCycles(u64 ticks);
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[[nodiscard]] constexpr s64 msToCycles(std::chrono::milliseconds ms) {
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return ms.count() * detail::BASE_CLOCK_RATE_ADJUSTED;
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}
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[[nodiscard]] constexpr s64 usToCycles(std::chrono::microseconds us) {
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return us.count() * detail::BASE_CLOCK_RATE_ADJUSTED / 1000;
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}
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[[nodiscard]] constexpr s64 nsToCycles(std::chrono::nanoseconds ns) {
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return ns.count() * detail::BASE_CLOCK_RATE_ADJUSTED / 1000000;
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}
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[[nodiscard]] constexpr u64 msToClockCycles(std::chrono::milliseconds ms) {
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return static_cast<u64>(ms.count()) * detail::CNTFREQ_ADJUSTED;
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}
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[[nodiscard]] constexpr u64 usToClockCycles(std::chrono::microseconds us) {
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return us.count() * detail::CNTFREQ_ADJUSTED / 1000;
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}
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[[nodiscard]] constexpr u64 nsToClockCycles(std::chrono::nanoseconds ns) {
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return ns.count() * detail::CNTFREQ_ADJUSTED / 1000000;
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}
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[[nodiscard]] constexpr u64 CpuCyclesToClockCycles(u64 ticks) {
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return ticks * detail::CNTFREQ_ADJUSTED / detail::BASE_CLOCK_RATE_ADJUSTED;
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}
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[[nodiscard]] constexpr std::chrono::milliseconds CyclesToMs(s64 cycles) {
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return std::chrono::milliseconds(cycles / detail::BASE_CLOCK_RATE_ADJUSTED);
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}
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[[nodiscard]] constexpr std::chrono::nanoseconds CyclesToNs(s64 cycles) {
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return std::chrono::nanoseconds(cycles * 1000000 / detail::BASE_CLOCK_RATE_ADJUSTED);
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}
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[[nodiscard]] constexpr std::chrono::microseconds CyclesToUs(s64 cycles) {
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return std::chrono::microseconds(cycles * 1000 / detail::BASE_CLOCK_RATE_ADJUSTED);
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}
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} // namespace Core::Timing
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