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Adding Decimal Compensation Operations

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Melefo
2020-02-25 10:59:59 +01:00
parent e9a7b9e8d7
commit c84bdd8be4
5 changed files with 94 additions and 8 deletions
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36
sources/APU/Instructions/DecimalCompensation.cpp Normal file
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@@ -0,0 +1,36 @@
//
// Created by Melefo on 25/02/2020.
//
#include "../APU.hpp"
namespace ComSquare::APU
{
int APU::DAA()
{
if (this->_internalRegisters.c || this->_internalRegisters.a > 0x99) {
this->_internalRegisters.c = true;
this->_internalRegisters.a += 0x60;
}
if (this->_internalRegisters.h || (this->_internalRegisters.a & 0x0Fu) > 0x09) {
this->_internalRegisters.a += 0x06;
}
this->_internalRegisters.n = this->_internalRegisters.a & 0x80u;
this->_internalRegisters.z = !this->_internalRegisters.a;
return 3;
}
int APU::DAS()
{
if (!this->_internalRegisters.c || this->_internalRegisters.a > 0x99) {
this->_internalRegisters.c = false;
this->_internalRegisters.a -= 0x60;
}
if (!this->_internalRegisters.h || (this->_internalRegisters.a & 0x0Fu) > 0x09) {
this->_internalRegisters.a -= 0x06;
}
this->_internalRegisters.n = this->_internalRegisters.a & 0x80u;
this->_internalRegisters.z = !this->_internalRegisters.a;
return 3;
}
}