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authorFernando Sahmkow <fsahmkow27@gmail.com>2019-02-16 01:04:11 +0100
committerFernandoS27 <fsahmkow27@gmail.com>2019-02-16 03:57:16 +0100
commitecccfe033777d6ae7d29bcf0cfc30412f7d3be24 (patch)
treef6504e5f766a6f8675764124f7d231843de40583 /src/core
parentImplement 128 bits Unsigned Integer Multiplication and Division. (diff)
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Diffstat (limited to 'src/core')
-rw-r--r--src/core/arm/dynarmic/arm_dynarmic.cpp2
-rw-r--r--src/core/core_timing_util.cpp8
-rw-r--r--src/core/core_timing_util.h2
3 files changed, 6 insertions, 6 deletions
diff --git a/src/core/arm/dynarmic/arm_dynarmic.cpp b/src/core/arm/dynarmic/arm_dynarmic.cpp
index d36538257..25f76259b 100644
--- a/src/core/arm/dynarmic/arm_dynarmic.cpp
+++ b/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;
diff --git a/src/core/core_timing_util.cpp b/src/core/core_timing_util.cpp
index 8fc92560a..aab4aa697 100644
--- a/src/core/core_timing_util.cpp
+++ b/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
diff --git a/src/core/core_timing_util.h b/src/core/core_timing_util.h
index 545d3a260..679aa3123 100644
--- a/src/core/core_timing_util.h
+++ b/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