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Adding Multiplication Division Operations

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Melefo
2020-02-25 11:48:48 +01:00
parent c84bdd8be4
commit a0f53ebd70
5 changed files with 84 additions and 4 deletions
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sources/APU/Instructions/MultiplicationDivision.cpp
+35
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@@ -0,0 +1,35 @@
//
// Created by Melefo on 25/02/2020.
//
#include "../APU.hpp"
namespace ComSquare::APU
{
int APU::MUL()
{
this->_internalRegisters.ya = this->_internalRegisters.y * this->_internalRegisters.a;
this->_internalRegisters.n = this->_internalRegisters.a & 0x80u;
this->_internalRegisters.z = !this->_internalRegisters.y;
return 9;
}
int APU::DIV()
{
uint16_t ya = this->_internalRegisters.ya;
this->_internalRegisters.v = this->_internalRegisters.y >= this->_internalRegisters.x;
this->_internalRegisters.h = (this->_internalRegisters.y & 0x0Fu) >= (this->_internalRegisters.x & 0x0Fu);
if (this->_internalRegisters.y < (this->_internalRegisters.x << 1u)) {
this->_internalRegisters.a = ya / this->_internalRegisters.x;
this->_internalRegisters.y = ya % this->_internalRegisters.x;
}
else {
this->_internalRegisters.a = 0xFF - (ya - (this->_internalRegisters.x << 9u)) / (0x100 - this->_internalRegisters.x);
this->_internalRegisters.y = this->_internalRegisters.x + (ya - (this->_internalRegisters.x << 9u)) % (0x100 - this->_internalRegisters.x);
}
this->_internalRegisters.z = !this->_internalRegisters.a;
this->_internalRegisters.n = this->_internalRegisters.a & 0x80u;
return 12;
}
}