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CP instruction

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This commit is contained in:
Franco Colmenarez 2021-10-17 10:55:16 -05:00
parent b098d28f0e
commit b3ba7b309e
2 changed files with 122 additions and 2 deletions
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2
src/bin/main.rs
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@ -4,7 +4,5 @@ use rust_boy::console::Console;
fn main() -> std::io::Result<()> {
let mut console = Console::new();
console.cpu_run();
/* let val: u8 = 0xFB;
println!("{}", val as i8); */
Ok(())
}

122
src/cpu.rs
View File

@ -466,6 +466,31 @@ impl CPU {
self.registers.set_flag(FlagRegister::Carry, false);
},
_ => {},
}
// Substract without storing the value
Opcode::CP(params) => {
let mut val1: i16 = 0;
let mut val2: i16 = 0;
match params {
OpcodeParameter::Register_U8(register, val) => {
self.registers.increment(Register::PC, 2);
val1 = self.registers.get(register) as i16;
val2 = val as i16;
},
OpcodeParameter::Register_Register(reg1, reg2) => {
self.registers.increment(Register::PC, 1);
val1 = self.registers.get(reg1) as i16;
match reg2.is_8bit() {
true => val2 = self.registers.get(reg2) as i16,
false => val2 = bus.read(self.registers.get(reg2)) as i16,
};
}
_ => {},
};
self.registers.set_flag(FlagRegister::Zero, (val1 - val2) == 0);
self.registers.set_flag(FlagRegister::Substract, true);
self.registers.set_flag(FlagRegister::HalfCarry, sub_half_carry(val1.to_be_bytes()[1], val2.to_be_bytes()[1]));
self.registers.set_flag(FlagRegister::Carry, val2 > val1);
},
// Increment by 1
Opcode::INC(affect_flags, register) => {
@ -1326,6 +1351,103 @@ mod tests {
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), false);
assert_eq!(cpu.registers.get(Register::PC), 0x102);
// CP
let mut cpu = CPU::new();
cpu.registers.set(Register::B, 0xF1);
cpu.exec(Opcode::CP(OpcodeParameter::Register_U8(Register::B, 0xF1)), &mut bus);
assert_eq!(cpu.registers.get_flag(FlagRegister::Zero), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::Substract), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), false);
assert_eq!(cpu.registers.get(Register::PC), 0x102);
let mut cpu = CPU::new();
cpu.registers.set(Register::B, 0b00110000);
cpu.exec(Opcode::CP(OpcodeParameter::Register_U8(Register::B, 0b00000100)), &mut bus);
assert_eq!(cpu.registers.get_flag(FlagRegister::Zero), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Substract), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), false);
assert_eq!(cpu.registers.get(Register::PC), 0x102);
let mut cpu = CPU::new();
cpu.registers.set(Register::B, 0b01000000);
cpu.exec(Opcode::CP(OpcodeParameter::Register_U8(Register::B, 0b10000000)), &mut bus);
assert_eq!(cpu.registers.get_flag(FlagRegister::Zero), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Substract), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), true);
assert_eq!(cpu.registers.get(Register::PC), 0x102);
let mut cpu = CPU::new();
cpu.registers.set(Register::B, 0xF1);
cpu.registers.set(Register::C, 0xF1);
cpu.exec(Opcode::CP(OpcodeParameter::Register_Register(Register::B, Register::C)), &mut bus);
assert_eq!(cpu.registers.get_flag(FlagRegister::Zero), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::Substract), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), false);
assert_eq!(cpu.registers.get(Register::PC), 0x101);
let mut cpu = CPU::new();
cpu.registers.set(Register::B, 0b00110000);
cpu.registers.set(Register::C, 0b00000100);
cpu.exec(Opcode::CP(OpcodeParameter::Register_Register(Register::B, Register::C)), &mut bus);
assert_eq!(cpu.registers.get_flag(FlagRegister::Zero), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Substract), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), false);
assert_eq!(cpu.registers.get(Register::PC), 0x101);
let mut cpu = CPU::new();
cpu.registers.set(Register::B, 0b01000000);
cpu.registers.set(Register::C, 0b10000000);
cpu.exec(Opcode::CP(OpcodeParameter::Register_Register(Register::B, Register::C)), &mut bus);
assert_eq!(cpu.registers.get_flag(FlagRegister::Zero), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Substract), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), true);
assert_eq!(cpu.registers.get(Register::PC), 0x101);
let mut cpu = CPU::new();
let mut bus = Bus::new();
let addr = 0xC000;
cpu.registers.set(Register::B, 0xF1);
cpu.registers.set(Register::HL, addr);
bus.write(addr, 0xF1);
cpu.exec(Opcode::CP(OpcodeParameter::Register_Register(Register::B, Register::HL)), &mut bus);
assert_eq!(cpu.registers.get_flag(FlagRegister::Zero), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::Substract), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), false);
assert_eq!(cpu.registers.get(Register::PC), 0x101);
let mut cpu = CPU::new();
let mut bus = Bus::new();
let addr = 0xC000;
cpu.registers.set(Register::B, 0b00110000);
cpu.registers.set(Register::HL, addr);
bus.write(addr, 0b00000100);
cpu.exec(Opcode::CP(OpcodeParameter::Register_Register(Register::B, Register::HL)), &mut bus);
assert_eq!(cpu.registers.get_flag(FlagRegister::Zero), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Substract), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), false);
assert_eq!(cpu.registers.get(Register::PC), 0x101);
let mut cpu = CPU::new();
let mut bus = Bus::new();
let addr = 0xC000;
cpu.registers.set(Register::B, 0b01000000);
cpu.registers.set(Register::HL, addr);
bus.write(addr, 0b10000000);
cpu.exec(Opcode::CP(OpcodeParameter::Register_Register(Register::B, Register::HL)), &mut bus);
assert_eq!(cpu.registers.get_flag(FlagRegister::Zero), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Substract), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), true);
assert_eq!(cpu.registers.get(Register::PC), 0x101);
// INC
let mut cpu = CPU::new();
cpu.registers.set(Register::A, 0);