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RR instruction

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This commit is contained in:
Franco Colmenarez 2021-10-18 10:25:45 -05:00
parent 8d1a0f6f2f
commit aad827f05f
1 changed files with 48 additions and 0 deletions
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48
src/cpu.rs
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@ -754,6 +754,17 @@ impl CPU {
self.registers.set_flag(FlagRegister::Substract, false); self.registers.set_flag(FlagRegister::Substract, false);
self.registers.set_flag(FlagRegister::HalfCarry, false); self.registers.set_flag(FlagRegister::HalfCarry, false);
}, },
Opcode::RR(register) => {
let val = self.registers.get_8bit(register);
let old_carry = self.registers.get_flag(FlagRegister::Carry);
let new_carry = get_bit(val, BitIndex::I6);
let val = val << 2 | ((old_carry as u8) << 1) | (val >> 7);
self.registers.set(register, val as u16);
self.registers.set_flag(FlagRegister::Carry, new_carry);
self.registers.set_flag(FlagRegister::Zero, val == 0);
self.registers.set_flag(FlagRegister::Substract, false);
self.registers.set_flag(FlagRegister::HalfCarry, false);
},
_ => {}, _ => {},
}; };
}, },
@ -2303,6 +2314,43 @@ mod tests {
assert_eq!(cpu.registers.get(Register::PC), 0x102); assert_eq!(cpu.registers.get(Register::PC), 0x102);
} }
#[test]
fn test_prefix_cb_rr_instruction() {
let mut bus = Bus::new();
let mut cpu = CPU::new();
cpu.registers.set(Register::A, 0b00000001);
cpu.registers.set_flag(FlagRegister::Carry, true);
cpu.exec(Opcode::PrefixCB(Box::new(Opcode::RR(Register::A))), &mut bus);
assert_eq!(cpu.registers.get_flag(FlagRegister::Zero), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Substract), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), false);
assert_eq!(cpu.registers.get(Register::A), 0b00000110);
assert_eq!(cpu.registers.get(Register::PC), 0x102);
let mut cpu = CPU::new();
cpu.registers.set(Register::A, 0b10000000);
cpu.registers.set_flag(FlagRegister::Carry, false);
cpu.exec(Opcode::PrefixCB(Box::new(Opcode::RR(Register::A))), &mut bus);
assert_eq!(cpu.registers.get_flag(FlagRegister::Zero), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Substract), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), false);
assert_eq!(cpu.registers.get(Register::A), 0b00000001);
assert_eq!(cpu.registers.get(Register::PC), 0x102);
let mut cpu = CPU::new();
cpu.registers.set(Register::A, 0b01000000);
cpu.registers.set_flag(FlagRegister::Carry, false);
cpu.exec(Opcode::PrefixCB(Box::new(Opcode::RR(Register::A))), &mut bus);
assert_eq!(cpu.registers.get_flag(FlagRegister::Zero), true);
assert_eq!(cpu.registers.get_flag(FlagRegister::Substract), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::HalfCarry), false);
assert_eq!(cpu.registers.get_flag(FlagRegister::Carry), true);
assert_eq!(cpu.registers.get(Register::A), 0b00000000);
assert_eq!(cpu.registers.get(Register::PC), 0x102);
}
#[test] #[test]
fn test_nop_instructions() { fn test_nop_instructions() {
let mut cpu = CPU::new(); let mut cpu = CPU::new();