smpregs.hpp 943 B

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  1. struct flag_t {
  2. bool n, v, p, b, h, i, z, c;
  3. inline operator unsigned() const {
  4. return (n << 7) + (v << 6) + (p << 5) + (b << 4)
  5. + (h << 3) + (i << 2) + (z << 1) + (c << 0);
  6. }
  7. inline unsigned operator=(uint8_t data) {
  8. n = data & 0x80; v = data & 0x40; p = data & 0x20; b = data & 0x10;
  9. h = data & 0x08; i = data & 0x04; z = data & 0x02; c = data & 0x01;
  10. return data;
  11. }
  12. inline unsigned operator|=(unsigned data) { return operator=(operator unsigned() | data); }
  13. inline unsigned operator^=(unsigned data) { return operator=(operator unsigned() ^ data); }
  14. inline unsigned operator&=(unsigned data) { return operator=(operator unsigned() & data); }
  15. flag_t() : n(0), v(0), p(0), b(0), h(0), i(0), z(0), c(0) {}
  16. };
  17. struct regs_t {
  18. uint16_t pc;
  19. union {
  20. uint16 ya;
  21. struct { uint8 order_lsb2(a, y); };
  22. };
  23. uint8_t x, sp;
  24. flag_t p;
  25. regs_t() : pc(0), ya(0), x(0), sp(0) {}
  26. };