EightBit/Intel8080/inc/StatusFlags.h
Adrian.Conlon 105032f08a Dump of all my C++ emulators, only Intel8080 integrated so far...
Signed-off-by: Adrian.Conlon <adrian.conlon@gmail.com>
2017-06-04 21:38:34 +01:00

72 lines
1.2 KiB
C++

#pragma once
#include <string>
#include <cstdint>
namespace EightBit {
struct StatusFlags {
bool S;
bool Z;
bool AC;
bool P;
bool C;
enum StatusBits {
Sign = 0x80, // S
Zero = 0x40, // Z
AuxiliaryCarry = 0x10, // AC
Parity = 0x4, // Z
Carry = 0x1, // S
};
StatusFlags(uint8_t value) {
S = (value & StatusBits::Sign) != 0;
Z = (value & StatusBits::Zero) != 0;
AC = (value & StatusBits::AuxiliaryCarry) != 0;
P = (value & StatusBits::Parity) != 0;
C = (value & StatusBits::Carry) != 0;
}
operator uint8_t() const {
uint8_t flags = 0;
if (S)
flags |= StatusBits::Sign;
if (Z)
flags |= StatusBits::Zero;
flags &= ~0x20; // Reserved off
if (AC)
flags |= StatusBits::AuxiliaryCarry;
flags &= ~0x8; // Reserved off
if (P)
flags |= StatusBits::Parity;
flags |= 0x2; // Reserved on
if (C)
flags |= StatusBits::Carry;
return flags;
}
operator std::string() const {
std::string returned;
returned += S ? "S" : "-";
returned += Z ? "Z" : "-";
returned += "0";
returned += AC ? "A" : "-";
returned += "0";
returned += P ? "P" : "-";
returned += "1";
returned += C ? "C" : "-";
return returned;
}
};
}