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Implementing some transfer registers instructions

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AnonymusRaccoon
2020-02-28 13:46:31 +01:00
parent 3e2231482d
commit ddaee43189
6 changed files with 215 additions and 2 deletions
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sources/CPU/Instructions/TransferRegisters.cpp
+48
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@@ -0,0 +1,48 @@
//
// Created by anonymus-raccoon on 2/28/20.
//
#include "../CPU.hpp"
namespace ComSquare::CPU
{
void CPU::TAX()
{
if (this->_registers.p.x_b) {
this->_registers.xl = this->_registers.al;
this->_registers.p.z = this->_registers.xl == 0;
this->_registers.p.n = this->_registers.x & 0x80u;
} else {
this->_registers.x = this->_registers.a;
this->_registers.p.z = this->_registers.x == 0;
this->_registers.p.n = this->_registers.x & 0x8000u;
}
}
void CPU::TAY()
{
if (this->_registers.p.x_b) {
this->_registers.yl = this->_registers.al;
this->_registers.p.z = this->_registers.yl == 0;
this->_registers.p.n = this->_registers.y & 0x80u;
} else {
this->_registers.y = this->_registers.a;
this->_registers.p.z = this->_registers.y == 0;
this->_registers.p.n = this->_registers.y & 0x8000u;
}
}
void CPU::TXS()
{
if (this->_registers.p.x_b) {
this->_registers.sh = 0;
this->_registers.sl = this->_registers.xl;
this->_registers.p.z = this->_registers.sl == 0;
this->_registers.p.n = this->_registers.s & 0x80u;
} else {
this->_registers.s = this->_registers.x;
this->_registers.p.z = this->_registers.s == 0;
this->_registers.p.n = this->_registers.s & 0x8000u;
}
}
}