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Corrections, documenting and fixes.

This commit is contained in:
Fernando Sahmkow 2019-02-16 16:52:24 -04:00
parent ecccfe0337
commit a8d4927e29
4 changed files with 14 additions and 13 deletions

View file

@ -3,31 +3,32 @@
#pragma intrinsic(_umul128)
#endif
#include <cstring>
#include "common/uint128.h"
namespace Common {
u128 Multiply64Into128(u64 a, u64 b) {
#ifdef _MSC_VER
u128 result;
#ifdef _MSC_VER
result[0] = _umul128(a, b, &result[1]);
#else
unsigned __int128 tmp = a;
tmp *= b;
u128 result;
std::memcpy(&result, &tmp, sizeof(u128));
#endif
return result;
}
std::pair<u64, u64> Divide128On64(u128 dividend, u64 divisor) {
std::pair<u64, u64> Divide128On32(u128 dividend, u32 divisor) {
u64 remainder = dividend[0] % divisor;
u64 accum = dividend[0] / divisor;
if (dividend[1] == 0)
return {accum, remainder};
// We ignore dividend[1] / divisor as that overflows
u64 first_segment = (dividend[1] % divisor) << 32;
const u64 first_segment = (dividend[1] % divisor) << 32;
accum += (first_segment / divisor) << 32;
u64 second_segment = (first_segment % divisor) << 32;
const u64 second_segment = (first_segment % divisor) << 32;
accum += (second_segment / divisor);
remainder += second_segment % divisor;
if (remainder >= divisor) {

View file

@ -1,13 +1,14 @@
#include <array>
#include <cstdint>
#include <cstring>
#include <utility>
#include "common/common_types.h"
namespace Common {
// This function multiplies 2 u64 values and produces a u128 value;
u128 Multiply64Into128(u64 a, u64 b);
std::pair<u64, u64> Divide128On64(u128 dividend, u64 divisor);
// This function divides a u128 by a u32 value and produces two u64 values:
// the result of division and the remainder
std::pair<u64, u64> Divide128On32(u128 dividend, u32 divisor);
} // namespace Common

View file

@ -152,7 +152,7 @@ std::unique_ptr<Dynarmic::A64::Jit> ARM_Dynarmic::MakeJit() const {
config.tpidr_el0 = &cb->tpidr_el0;
config.dczid_el0 = 4;
config.ctr_el0 = 0x8444c004;
config.cntfrq_el0 = Timing::CNTFREQ; // Value from fusee.
config.cntfrq_el0 = Timing::CNTFREQ;
// Unpredictable instructions
config.define_unpredictable_behaviour = true;

View file

@ -62,9 +62,8 @@ s64 nsToCycles(u64 ns) {
}
u64 CpuCyclesToClockCycles(u64 ticks) {
u128 temporal = Common::Multiply64Into128(ticks, CNTFREQ);
std::pair<u64, u64> result = Common::Divide128On64(temporal, BASE_CLOCK_RATE);
return result.first;
const u128 temporal = Common::Multiply64Into128(ticks, CNTFREQ);
return Common::Divide128On32(temporal, static_cast<u32>(BASE_CLOCK_RATE)).first;
}
} // namespace Core::Timing