mirror of
https://git.suyu.dev/suyu/dynarmic.git
synced 2026-03-12 04:46:31 +00:00
72 lines
1.8 KiB
C++
72 lines
1.8 KiB
C++
/* This file is part of the dynarmic project.
|
|
* Copyright (c) 2018 MerryMage
|
|
* This software may be used and distributed according to the terms of the GNU
|
|
* General Public License version 2 or any later version.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <tuple>
|
|
|
|
#include "common/common_types.h"
|
|
#include "common/fp/fpcr.h"
|
|
|
|
namespace Dynarmic::FP {
|
|
|
|
class FPSR;
|
|
enum class RoundingMode;
|
|
|
|
enum class FPType {
|
|
Nonzero,
|
|
Zero,
|
|
Infinity,
|
|
QNaN,
|
|
SNaN,
|
|
};
|
|
|
|
constexpr size_t normalized_point_position = 62;
|
|
|
|
/// value = (sign ? -1 : +1) * mantissa/(2^62) * 2^exponent
|
|
/// 63rd bit of mantissa is always set (unless value is zero)
|
|
struct FPUnpacked {
|
|
bool sign;
|
|
int exponent;
|
|
u64 mantissa;
|
|
};
|
|
|
|
inline bool operator==(const FPUnpacked& a, const FPUnpacked& b) {
|
|
return std::tie(a.sign, a.exponent, a.mantissa) == std::tie(b.sign, b.exponent, b.mantissa);
|
|
}
|
|
|
|
/// return value = (sign ? -1 : +1) * value * 2^exponent
|
|
constexpr FPUnpacked ToNormalized(bool sign, int exponent, u64 value) {
|
|
if (value == 0) {
|
|
return {sign, 0, 0};
|
|
}
|
|
|
|
const int highest_bit = Common::HighestSetBit(value);
|
|
const int offset = static_cast<int>(normalized_point_position) - highest_bit;
|
|
value <<= offset;
|
|
exponent -= offset - normalized_point_position;
|
|
return {sign, exponent, value};
|
|
}
|
|
|
|
template<typename FPT>
|
|
std::tuple<FPType, bool, FPUnpacked> FPUnpack(FPT op, FPCR fpcr, FPSR& fpsr);
|
|
|
|
template<typename FPT>
|
|
FPT FPRoundBase(FPUnpacked op, FPCR fpcr, RoundingMode rounding, FPSR& fpsr);
|
|
|
|
template<typename FPT>
|
|
FPT FPRound(FPUnpacked op, FPCR fpcr, RoundingMode rounding, FPSR& fpsr) {
|
|
fpcr.AHP(false);
|
|
return FPRoundBase<FPT>(op, fpcr, rounding, fpsr);
|
|
}
|
|
|
|
template<typename FPT>
|
|
FPT FPRound(FPUnpacked op, FPCR fpcr, FPSR& fpsr) {
|
|
return FPRound<FPT>(op, fpcr, fpcr.RMode(), fpsr);
|
|
}
|
|
|
|
} // namespace Dynarmic::FP
|