54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
// 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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namespace Core::Timing {
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constexpr u64 MAX_VALUE_TO_MULTIPLY = std::numeric_limits<s64>::max() / BASE_CLOCK_RATE;
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s64 usToCycles(s64 us) {
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if (static_cast<u64>(us / 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) > MAX_VALUE_TO_MULTIPLY) {
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LOG_DEBUG(Core_Timing, "Time very big, do rounding");
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return BASE_CLOCK_RATE * (us / 1000000);
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}
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return (BASE_CLOCK_RATE * us) / 1000000;
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}
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s64 usToCycles(u64 us) {
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return usToCycles(static_cast<s64>(us));
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}
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s64 nsToCycles(s64 ns) {
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if (static_cast<u64>(ns / 1000000000) > 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>(ns) > MAX_VALUE_TO_MULTIPLY) {
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LOG_DEBUG(Core_Timing, "Time very big, do rounding");
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return BASE_CLOCK_RATE * (ns / 1000000000);
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}
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return (BASE_CLOCK_RATE * ns) / 1000000000;
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}
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s64 nsToCycles(u64 ns) {
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return nsToCycles(static_cast<s64>(ns));
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}
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u64 CpuCyclesToClockCycles(u64 ticks) {
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const u128 temporal = Common::Multiply64Into128(ticks, CNTFREQ);
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return Common::Divide128On32(temporal, static_cast<u32>(BASE_CLOCK_RATE)).first;
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}
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} // namespace Core::Timing
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