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Adding branch instructions

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This commit is contained in:
AnonymusRaccoon
2020-02-28 19:20:59 +01:00
parent 68b82c9cda
commit d1561f1be3
6 changed files with 417 additions and 2 deletions
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sources/CPU/Instructions/InternalInstruction.cpp
+71
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@@ -226,4 +226,75 @@ namespace ComSquare::CPU
this->_registers.p.n = y & 0x8000u;
}
}
bool CPU::BCC(uint24_t valueAddr)
{
if (!this->_registers.p.c)
this->_registers.pac += static_cast<int8_t>(this->_bus->read(valueAddr));
return !this->_registers.p.c;
}
bool CPU::BCS(uint24_t valueAddr)
{
if (this->_registers.p.c)
this->_registers.pac += static_cast<int8_t>(this->_bus->read(valueAddr));
return this->_registers.p.c;
}
bool CPU::BEQ(uint24_t valueAddr)
{
if (this->_registers.p.z)
this->_registers.pac += static_cast<int8_t>(this->_bus->read(valueAddr));
return this->_registers.p.z;
}
bool CPU::BNE(uint24_t valueAddr)
{
if (!this->_registers.p.z)
this->_registers.pac += static_cast<int8_t>(this->_bus->read(valueAddr));
return !this->_registers.p.z;
}
bool CPU::BMI(uint24_t valueAddr)
{
if (this->_registers.p.n)
this->_registers.pac += static_cast<int8_t>(this->_bus->read(valueAddr));
return this->_registers.p.n;
}
bool CPU::BPL(uint24_t valueAddr)
{
if (!this->_registers.p.n)
this->_registers.pac += static_cast<int8_t>(this->_bus->read(valueAddr));
return !this->_registers.p.n;
}
bool CPU::BRA(uint24_t valueAddr)
{
this->_registers.pac += static_cast<int8_t>(this->_bus->read(valueAddr));
return true;
}
bool CPU::BRL(uint24_t valueAddr)
{
unsigned value = this->_bus->read(valueAddr);
value += this->_bus->read(valueAddr + 1) << 8u;
this->_registers.pac += static_cast<int16_t>(value);
return true;
}
bool CPU::BVC(uint24_t valueAddr)
{
if (!this->_registers.p.v)
this->_registers.pac += static_cast<int8_t>(this->_bus->read(valueAddr));
return !this->_registers.p.v;
}
bool CPU::BVS(uint24_t valueAddr)
{
if (this->_registers.p.v)
this->_registers.pac += static_cast<int8_t>(this->_bus->read(valueAddr));
return this->_registers.p.v;
}
}