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https://git.eden-emu.dev/eden-emu/eden.git
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lizzie
94e9c2bd74
while this may be true, it isn't required to have this quick path for this function because: a) arm64 b) counter/freq and counter%freq is a single idiv c) 2 muls, 2 div isnt that insanely expensive d) `static_assert(period::den % TenMHz == 0)` Signed-off-by: lizzie <lizzie@eden-emu.dev> Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4162 Reviewed-by: MaranBr <maranbr@eden-emu.dev> Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
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// SPDX-License-Identifier: GPL-3.0-or-later
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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#if defined(_WIN32)
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#include <windows.h>
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#else
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#include <time.h>
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#endif
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#include "common/steady_clock.h"
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namespace Common {
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#ifdef _WIN32
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static s64 WindowsQueryPerformanceFrequency() {
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LARGE_INTEGER frequency;
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QueryPerformanceFrequency(&frequency);
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return frequency.QuadPart;
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}
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static s64 WindowsQueryPerformanceCounter() {
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LARGE_INTEGER counter;
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QueryPerformanceCounter(&counter);
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return counter.QuadPart;
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}
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static s64 GetSystemTimeNS() {
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static auto pf = (decltype(&GetSystemTimePreciseAsFileTime))(void*)GetProcAddress(GetModuleHandle(TEXT("Kernel32.dll")), "GetSystemTimePreciseAsFileTime"); // Windows 8+
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if (pf) {
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// GetSystemTimePreciseAsFileTime returns the file time in 100ns units.
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constexpr s64 Multiplier = 100;
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// Convert Windows epoch to Unix epoch.
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constexpr s64 WindowsEpochToUnixEpoch = 0x19DB1DED53E8000LL;
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FILETIME filetime;
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pf(&filetime);
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return Multiplier * ((s64(filetime.dwHighDateTime) << 32) + s64(filetime.dwLowDateTime) - WindowsEpochToUnixEpoch);
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} else {
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// Only Windows XP and below error out here
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LARGE_INTEGER ticks;
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QueryPerformanceCounter(&ticks);
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return ticks.QuadPart;
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}
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}
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#endif
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SteadyClock::time_point SteadyClock::Now() noexcept {
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#if defined(_WIN32)
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static const auto timer_freq = WindowsQueryPerformanceFrequency();
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const auto counter = WindowsQueryPerformanceCounter();
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const auto whole = (counter / timer_freq) * period::den;
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const auto part = (counter % timer_freq) * period::den / timer_freq;
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return time_point{duration{whole + part}};
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#elif defined(__APPLE__)
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return time_point{duration{clock_gettime_nsec_np(CLOCK_MONOTONIC_RAW)}};
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#else
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timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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return time_point{std::chrono::seconds{ts.tv_sec} + std::chrono::nanoseconds{ts.tv_nsec}};
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#endif
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}
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RealTimeClock::time_point RealTimeClock::Now() noexcept {
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#if defined(_WIN32)
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return time_point{duration{GetSystemTimeNS()}};
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#elif defined(__APPLE__)
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return time_point{duration{clock_gettime_nsec_np(CLOCK_REALTIME)}};
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#else
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timespec ts;
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clock_gettime(CLOCK_REALTIME, &ts);
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return time_point{std::chrono::seconds{ts.tv_sec} + std::chrono::nanoseconds{ts.tv_nsec}};
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#endif
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}
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}; // namespace Common
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