common: wall_clock: Optimize GetClockCycles/GetCPUCycles to use a single MUL instruction.
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@ -2,6 +2,8 @@
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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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#include <cstdint>
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#include "common/uint128.h"
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#include "common/wall_clock.h"
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@ -18,7 +20,9 @@ using base_time_point = std::chrono::time_point<base_timer>;
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class StandardWallClock final : public WallClock {
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public:
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explicit StandardWallClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequency_)
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: WallClock(emulated_cpu_frequency_, emulated_clock_frequency_, false) {
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: WallClock(emulated_cpu_frequency_, emulated_clock_frequency_, false),
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emulated_clock_factor{GetFixedPoint64Factor(emulated_clock_frequency, 1000000000)},
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emulated_cpu_factor{GetFixedPoint64Factor(emulated_cpu_frequency, 1000000000)} {
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start_time = base_timer::now();
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}
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@ -41,16 +45,11 @@ public:
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}
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u64 GetClockCycles() override {
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std::chrono::nanoseconds time_now = GetTimeNS();
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const u128 temporary =
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Common::Multiply64Into128(time_now.count(), emulated_clock_frequency);
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return Common::Divide128On32(temporary, 1000000000).first;
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return MultiplyHigh(GetTimeNS().count(), emulated_clock_factor);
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}
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u64 GetCPUCycles() override {
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std::chrono::nanoseconds time_now = GetTimeNS();
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const u128 temporary = Common::Multiply64Into128(time_now.count(), emulated_cpu_frequency);
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return Common::Divide128On32(temporary, 1000000000).first;
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return MultiplyHigh(GetTimeNS().count(), emulated_cpu_factor);
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}
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void Pause([[maybe_unused]] bool is_paused) override {
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@ -59,6 +58,8 @@ public:
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private:
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base_time_point start_time;
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const u64 emulated_clock_factor;
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const u64 emulated_cpu_factor;
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};
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#ifdef ARCHITECTURE_x86_64
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