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More bugs on add instructions

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This commit is contained in:
Franco Colmenarez 2021-10-19 14:33:11 -05:00
parent 8b287c17c7
commit 3b81d34d71
1 changed files with 23 additions and 5 deletions
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28
src/cpu.rs
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@ -539,17 +539,20 @@ impl CPU {
self.registers.set_flag(FlagRegister::Zero, self.registers.get(reg1) == 0);
self.registers.set_flag(FlagRegister::Carry, res > 0xFF);
} else if reg1.is_16bit() && reg2.is_16bit() {
let res = (self.registers.get(reg1) as usize) + (self.registers.get(reg2) as usize);
let val1 = self.registers.get(reg1);
let val2 = self.registers.get(reg2);
self.registers.set_flag(FlagRegister::HalfCarry, add_half_carry_16bit(self.registers.get(reg1), self.registers.get(reg2)));
self.registers.increment(reg1, self.registers.get(reg2));
self.registers.set_flag(FlagRegister::Carry, res > 0xFFFF);
let res = (val1 as usize) + (val2 as usize);
let carry = ((val1 & 0x00FF) + (val2 & 0x00FF) > 0x00FF) || (res > 0xFFFF);
self.registers.set_flag(FlagRegister::Carry, carry);
println!("Carry: {}", carry);
} else if reg1.is_8bit() && reg2.is_16bit() {
let val1 = self.registers.get(reg1);
let val2 = bus.read(self.registers.get(reg2)) as u16;
self.registers.increment(reg1, val2);
self.registers.set_flag(FlagRegister::HalfCarry, add_half_carry(val1.to_be_bytes()[1], val2.to_be_bytes()[1]));
self.registers.set_flag(FlagRegister::Zero, self.registers.get(reg1) == 0);
self.registers.set_flag(FlagRegister::Carry, self.registers.get(reg1) == 0);
self.registers.set_flag(FlagRegister::Carry, (val1 as usize + val2 as usize) > 0xFF);
}
},
@ -566,10 +569,11 @@ impl CPU {
self.registers.increment(Register::PC, 1);
let val1 = self.registers.get(reg1) as i16;
let val2 = value as i16;
let res = (val1) + (val2);
self.registers.increment(reg1, val2 as u16);
self.registers.set_flag(FlagRegister::HalfCarry, add_half_carry(val1.to_be_bytes()[1], val2.to_be_bytes()[1]));
self.registers.set_flag(FlagRegister::Zero, self.registers.get(reg1) == 0);
self.registers.set_flag(FlagRegister::Carry, self.registers.get(reg1) == 0);
self.registers.set_flag(FlagRegister::Carry, res > 0xFF);
},
_ => {},
};
@ -1211,7 +1215,7 @@ impl CPU {
0x19 => Opcode::ADD(OpcodeParameter::Register_Register(Register::HL, Register::DE)),
0x29 => Opcode::ADD(OpcodeParameter::Register_Register(Register::HL, Register::HL)),
0x39 => Opcode::ADD(OpcodeParameter::Register_Register(Register::HL, Register::SP)),
0xE8 => Opcode::ADD(OpcodeParameter::Register_I8(Register::HL, params.1 as i8)),
0xE8 => Opcode::ADD(OpcodeParameter::Register_I8(Register::SP, params.1 as i8)),
0x8F => Opcode::ADC(OpcodeParameter::Register_Register(Register::A, Register::A)),
0x88 => Opcode::ADC(OpcodeParameter::Register_Register(Register::A, Register::B)),
0x89 => Opcode::ADC(OpcodeParameter::Register_Register(Register::A, Register::C)),
@ -2441,6 +2445,20 @@ mod tests {
assert_eq!(cpu.registers.get(Register::B), 0);
assert_eq!(cpu.registers.get(Register::PC), 0x102);
let mut cpu = CPU::new();
cpu.registers.set(Register::SP, 0x0000);
cpu.exec(Opcode::ADD(OpcodeParameter::Register_I8(Register::SP, 0x01)), &mut bus);
assert_eq!(cpu.registers.get(Register::SP), 0x0001);
assert_eq!(cpu.registers.get(Register::PC), 0x102);
let mut cpu = CPU::new();
cpu.registers.set(Register::SP, 0x00FF);
cpu.exec(Opcode::ADD(OpcodeParameter::Register_I8(Register::SP, 0x01)), &mut bus);
assert_eq!(cpu.registers.get(Register::SP), 0x0100);
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), true);
assert_eq!(cpu.registers.get(Register::PC), 0x102);
let mut cpu = CPU::new();
cpu.registers.set(Register::BC, 0b0000100000000000);
cpu.registers.set(Register::HL, 0b0000100000000000);