8086 2

#include <cstdint>

enum { AX, CX, DX, BX, SP, BP, SI, DI, ES, CS, DS, SS, IP, FLAGS };
enum { AL, CL, DL, BL, AH, CH, DH, BH };
enum { OF = 1 << 11, DF = 1 << 10, IF = 1 << 9, TF = 1 << 8, SF = 1 << 7,
       ZF = 1 << 6, AF = 1 << 4, PF = 1 << 2, CF = 1 << 0 };

class CPU {
public:
    inline uint8_t& regs8(int reg) {
        if (reg < 4) return _regs.bytes[reg * 2];
        else return _regs.bytes[(reg - 4) * 2 + 1];
    }
    inline uint16_t& regs16(int reg) {
        return _regs.words[reg];
    }
    inline uint8_t iregs8(int reg) {
        return reg;
    }
    inline uint8_t iregs16(int reg) {
        if (reg < 8) return reg;
        else return reg - 8;
    }
private:
    union {
        uint16_t words[14];
        uint8_t  bytes[8];
    } _regs;
};

int main(int argc, char **argv) {
    return 0;
}