static uint32 decode(uint8 offset_type, uint32 addr) {
uint32 r = 0;
switch(offset_type) {
case OPTYPE_DP:
r = (Registers.D.W + (addr & 0xffff)) & 0xffff;
break;
case OPTYPE_DPX:
r = (Registers.D.W + Registers.X.W + (addr & 0xffff)) & 0xffff;
break;
case OPTYPE_DPY:
r = (Registers.D.W + Registers.Y.W + (addr & 0xffff)) & 0xffff;
break;
case OPTYPE_IDP:
addr = (Registers.D.W + (addr & 0xffff)) & 0xffff;
r = (Registers.DB << 16) + dreadw(addr);
break;
case OPTYPE_IDPX:
addr = (Registers.D.W + Registers.X.W + (addr & 0xffff)) & 0xffff;
r = (Registers.DB << 16) + dreadw(addr);
break;
case OPTYPE_IDPY:
addr = (Registers.D.W + (addr & 0xffff)) & 0xffff;
r = (Registers.DB << 16) + dreadw(addr) + Registers.Y.W;
break;
case OPTYPE_ILDP:
addr = (Registers.D.W + (addr & 0xffff)) & 0xffff;
r = dreadl(addr);
break;
case OPTYPE_ILDPY:
addr = (Registers.D.W + (addr & 0xffff)) & 0xffff;
r = dreadl(addr) + Registers.Y.W;
break;
case OPTYPE_ADDR:
r = (Registers.DB << 16) + (addr & 0xffff);
break;
case OPTYPE_ADDR_PC:
r = (Registers.PB << 16) + (addr & 0xffff);
break;
case OPTYPE_ADDRX:
r = (Registers.DB << 16) + (addr & 0xffff) + Registers.X.W;
break;
case OPTYPE_ADDRY:
r = (Registers.DB << 16) + (addr & 0xffff) + Registers.Y.W;
break;
case OPTYPE_IADDR_PC:
r = (Registers.PB << 16) + (addr & 0xffff);
break;
case OPTYPE_IADDRX:
r = (Registers.PB << 16) + ((addr + Registers.X.W) & 0xffff);
break;
case OPTYPE_ILADDR:
r = addr;
break;
case OPTYPE_LONG:
r = addr;
break;
case OPTYPE_LONGX:
r = (addr + Registers.X.W);
break;
case OPTYPE_SR:
r = (Registers.S.W + (addr & 0xff)) & 0xffff;
break;
case OPTYPE_ISRY:
addr = (Registers.S.W + (addr & 0xff)) & 0xffff;
r = (Registers.DB << 16) + dreadw(addr) + Registers.Y.W;
break;
case OPTYPE_RELB:
r = (Registers.PB << 16) + ((Registers.PCw + 2) & 0xffff);
r += (int8)(addr & 0xff);
break;
case OPTYPE_RELW:
r = (Registers.PB << 16) + ((Registers.PCw + 3) & 0xffff);
r += (int16)(addr & 0xffff);
break;
}
return(r & 0xffffff);
}
uint32 CPU::decode(uint8 offset_type, uint32 addr) {
uint32 r = 0;
switch(offset_type) {
case OPTYPE_DP:
r = (regs.d + (addr & 0xffff)) & 0xffff;
break;
case OPTYPE_DPX:
r = (regs.d + regs.x + (addr & 0xffff)) & 0xffff;
break;
case OPTYPE_DPY:
r = (regs.d + regs.y + (addr & 0xffff)) & 0xffff;
break;
case OPTYPE_IDP:
addr = (regs.d + (addr & 0xffff)) & 0xffff;
r = (regs.db << 16) + dreadw(addr);
break;
case OPTYPE_IDPX:
addr = (regs.d + regs.x + (addr & 0xffff)) & 0xffff;
r = (regs.db << 16) + dreadw(addr);
break;
case OPTYPE_IDPY:
addr = (regs.d + (addr & 0xffff)) & 0xffff;
r = (regs.db << 16) + dreadw(addr) + regs.y;
break;
case OPTYPE_ILDP:
addr = (regs.d + (addr & 0xffff)) & 0xffff;
r = dreadl(addr);
break;
case OPTYPE_ILDPY:
addr = (regs.d + (addr & 0xffff)) & 0xffff;
r = dreadl(addr) + regs.y;
break;
case OPTYPE_ADDR:
r = (regs.db << 16) + (addr & 0xffff);
break;
case OPTYPE_ADDR_PC:
r = (regs.pc.b << 16) + (addr & 0xffff);
break;
case OPTYPE_ADDRX:
r = (regs.db << 16) + (addr & 0xffff) + regs.x;
break;
case OPTYPE_ADDRY:
r = (regs.db << 16) + (addr & 0xffff) + regs.y;
break;
case OPTYPE_IADDR_PC:
r = (regs.pc.b << 16) + (addr & 0xffff);
break;
case OPTYPE_IADDRX:
r = (regs.pc.b << 16) + ((addr + regs.x) & 0xffff);
break;
case OPTYPE_ILADDR:
r = addr;
break;
case OPTYPE_LONG:
r = addr;
break;
case OPTYPE_LONGX:
r = (addr + regs.x);
break;
case OPTYPE_SR:
r = (regs.s + (addr & 0xff)) & 0xffff;
break;
case OPTYPE_ISRY:
addr = (regs.s + (addr & 0xff)) & 0xffff;
r = (regs.db << 16) + dreadw(addr) + regs.y;
break;
case OPTYPE_RELB:
r = (regs.pc.b << 16) + ((regs.pc.w + 2) & 0xffff);
r += int8(addr);
break;
case OPTYPE_RELW:
r = (regs.pc.b << 16) + ((regs.pc.w + 3) & 0xffff);
r += int16(addr);
break;
}
return(r & 0xffffff);
}
