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X64 Clock: Reduce accuracy to be less or equal to guest accuracy.
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@ -62,7 +62,8 @@ u64 NativeClock::GetRTSC() {
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}
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accumulated_ticks += diff;
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rtsc_serialize.unlock();
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return accumulated_ticks;
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/// The clock cannot be more precise than the guest timer, remove the lower bits
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return accumulated_ticks & inaccuracy_mask;
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}
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void NativeClock::Pause(bool is_paused) {
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@ -31,6 +31,11 @@ public:
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private:
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u64 GetRTSC();
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/// value used to reduce the native clocks accuracy as some apss rely on
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/// undefined behavior where the level of accuracy in the clock shouldn't
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/// be higher.
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static constexpr u64 inaccuracy_mask = ~(0x100 - 1);
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SpinLock rtsc_serialize{};
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u64 last_measure{};
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u64 accumulated_ticks{};
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@ -184,6 +184,9 @@ std::shared_ptr<Dynarmic::A64::Jit> ARM_Dynarmic_64::MakeJit(Common::PageTable&
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config.enable_fast_dispatch = false;
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}
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// CNTPCT uses wall clock.
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config.wall_clock_cntpct = true;
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return std::make_shared<Dynarmic::A64::Jit>(config);
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}
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