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Bug RLA and RRA

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This commit is contained in:
Franco Colmenarez 2021-10-18 12:31:25 -05:00
parent 59acdd555e
commit ca4a6c9f6a
1 changed files with 76 additions and 0 deletions
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76
src/cpu.rs
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@ -706,6 +706,30 @@ impl CPU {
self.registers.set_flag(FlagRegister::HalfCarry, false);
self.registers.set_flag(FlagRegister::Carry, get_bit(result, BitIndex::I0));
},
Opcode::RLA => {
self.registers.increment(Register::PC, 1);
let val = self.registers.get_8bit(Register::A);
let old_carry = self.registers.get_flag(FlagRegister::Carry);
let new_carry = get_bit(val, BitIndex::I7);
let val = val << 1 | (old_carry as u8);
self.registers.set(Register::A, val as u16);
self.registers.set_flag(FlagRegister::Carry, new_carry);
self.registers.set_flag(FlagRegister::Zero, false);
self.registers.set_flag(FlagRegister::Substract, false);
self.registers.set_flag(FlagRegister::HalfCarry, false);
},
Opcode::RRA => {
self.registers.increment(Register::PC, 1);
let val = self.registers.get_8bit(Register::A);
let old_carry = self.registers.get_flag(FlagRegister::Carry);
let new_carry = get_bit(val, BitIndex::I0);
let val = val >> 1 | ((old_carry as u8) << 7);
self.registers.set(Register::A, val as u16);
self.registers.set_flag(FlagRegister::Carry, new_carry);
self.registers.set_flag(FlagRegister::Zero, false);
self.registers.set_flag(FlagRegister::Substract, false);
self.registers.set_flag(FlagRegister::HalfCarry, false);
},
Opcode::PrefixCB(opcode) => {
self.registers.increment(Register::PC, 2);
match *opcode {
@ -2253,6 +2277,58 @@ mod tests {
assert_eq!(cpu.registers.get(Register::PC), 0x101);
}
#[test]
fn test_prefix_rla_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::RLA, &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), 0b00000011);
assert_eq!(cpu.registers.get(Register::PC), 0x101);
let mut cpu = CPU::new();
cpu.registers.set(Register::A, 0b10000000);
cpu.registers.set_flag(FlagRegister::Carry, false);
cpu.exec(Opcode::RLA, &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), true);
assert_eq!(cpu.registers.get(Register::A), 0b00000000);
assert_eq!(cpu.registers.get(Register::PC), 0x101);
}
#[test]
fn test_prefix_rra_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::RRA, &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), true);
assert_eq!(cpu.registers.get(Register::A), 0b10000000);
assert_eq!(cpu.registers.get(Register::PC), 0x101);
let mut cpu = CPU::new();
cpu.registers.set(Register::A, 0b10000000);
cpu.registers.set_flag(FlagRegister::Carry, false);
cpu.exec(Opcode::RRA, &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), 0b01000000);
assert_eq!(cpu.registers.get(Register::PC), 0x101);
}
#[test]
fn test_prefix_cb_rlc_instruction() {
let mut bus = Bus::new();