Use u128 on Clock Cycles calculation.

src/core/arm/dynarmic/arm_dynarmic.cpp

@@ -120,7 +120,7 @@ public:
         return std::max(parent.core_timing.GetDowncount(), 0);
     }
     u64 GetCNTPCT() override {
-        return CpuCyclesToClockCycles(parent.core_timing.GetTicks());
+        return Timing::CpuCyclesToClockCycles(parent.core_timing.GetTicks());
     }
 
     ARM_Dynarmic& parent;

src/core/core_timing_util.cpp

@@ -7,6 +7,7 @@
 #include <cinttypes>
 #include <limits>
 #include "common/logging/log.h"
+#include "common/uint128.h"
 
 namespace Core::Timing {
 
@@ -61,10 +62,9 @@ s64 nsToCycles(u64 ns) {
 }
 
 u64 CpuCyclesToClockCycles(u64 ticks) {
-    u64 result = ticks;
-    result *= CNTFREQ;
-    result /= BASE_CLOCK_RATE;
-    return static_cast<u64>(result);
+    u128 temporal = Common::Multiply64Into128(ticks, CNTFREQ);
+    std::pair<u64, u64> result = Common::Divide128On64(temporal, BASE_CLOCK_RATE);
+    return result.first;
 }
 
 } // namespace Core::Timing

src/core/core_timing_util.h

@@ -11,7 +11,7 @@ namespace Core::Timing {
 // The below clock rate is based on Switch's clockspeed being widely known as 1.020GHz
 // The exact value used is of course unverified.
 constexpr u64 BASE_CLOCK_RATE = 1019215872; // Switch clock speed is 1020MHz un/docked
-constexpr u64 CNTFREQ = 19200000;  // Value from fusee.
+constexpr u64 CNTFREQ = 19200000;           // Value from fusee.
 
 inline s64 msToCycles(int ms) {
     // since ms is int there is no way to overflow