Corrections, documenting and fixes.
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@ -3,31 +3,32 @@
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#pragma intrinsic(_umul128)
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#endif
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#include <cstring>
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#include "common/uint128.h"
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namespace Common {
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u128 Multiply64Into128(u64 a, u64 b) {
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#ifdef _MSC_VER
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u128 result;
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#ifdef _MSC_VER
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result[0] = _umul128(a, b, &result[1]);
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#else
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unsigned __int128 tmp = a;
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tmp *= b;
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u128 result;
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std::memcpy(&result, &tmp, sizeof(u128));
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#endif
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return result;
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}
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std::pair<u64, u64> Divide128On64(u128 dividend, u64 divisor) {
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std::pair<u64, u64> Divide128On32(u128 dividend, u32 divisor) {
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u64 remainder = dividend[0] % divisor;
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u64 accum = dividend[0] / divisor;
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if (dividend[1] == 0)
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return {accum, remainder};
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// We ignore dividend[1] / divisor as that overflows
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u64 first_segment = (dividend[1] % divisor) << 32;
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const u64 first_segment = (dividend[1] % divisor) << 32;
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accum += (first_segment / divisor) << 32;
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u64 second_segment = (first_segment % divisor) << 32;
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const u64 second_segment = (first_segment % divisor) << 32;
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accum += (second_segment / divisor);
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remainder += second_segment % divisor;
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if (remainder >= divisor) {
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@ -1,13 +1,14 @@
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#include <array>
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#include <cstdint>
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#include <cstring>
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#include <utility>
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#include "common/common_types.h"
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namespace Common {
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// This function multiplies 2 u64 values and produces a u128 value;
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u128 Multiply64Into128(u64 a, u64 b);
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std::pair<u64, u64> Divide128On64(u128 dividend, u64 divisor);
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// This function divides a u128 by a u32 value and produces two u64 values:
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// the result of division and the remainder
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std::pair<u64, u64> Divide128On32(u128 dividend, u32 divisor);
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} // namespace Common
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@ -152,7 +152,7 @@ std::unique_ptr<Dynarmic::A64::Jit> ARM_Dynarmic::MakeJit() const {
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config.tpidr_el0 = &cb->tpidr_el0;
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config.dczid_el0 = 4;
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config.ctr_el0 = 0x8444c004;
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config.cntfrq_el0 = Timing::CNTFREQ; // Value from fusee.
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config.cntfrq_el0 = Timing::CNTFREQ;
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// Unpredictable instructions
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config.define_unpredictable_behaviour = true;
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@ -62,9 +62,8 @@ s64 nsToCycles(u64 ns) {
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}
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u64 CpuCyclesToClockCycles(u64 ticks) {
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u128 temporal = Common::Multiply64Into128(ticks, CNTFREQ);
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std::pair<u64, u64> result = Common::Divide128On64(temporal, BASE_CLOCK_RATE);
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return result.first;
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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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