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ADC and SBC instructions (no tests)

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This commit is contained in:
Franco Colmenarez 2021-10-18 13:15:26 -05:00
parent 2b633c9ee0
commit aded5fe534
2 changed files with 43 additions and 1 deletions
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42
src/cpu.rs
View File

@ -561,6 +561,27 @@ impl CPU {
_ => {},
};
},
Opcode::ADC(params) => match params {
OpcodeParameter::Register_Register(reg1, reg2) => {
if self.registers.get_flag(FlagRegister::Carry) {
self.registers.increment(reg1, 1);
}
self.exec(Opcode::ADD(OpcodeParameter::Register_Register(reg1, reg2)), bus);
},
OpcodeParameter::Register_U8(reg1, val) => {
if self.registers.get_flag(FlagRegister::Carry) {
self.registers.increment(reg1, 1);
}
self.exec(Opcode::ADD(OpcodeParameter::Register_U8(reg1, val)), bus);
},
OpcodeParameter::Register_I8(reg1, val) => {
if self.registers.get_flag(FlagRegister::Carry) {
self.registers.increment(reg1, 1);
}
self.exec(Opcode::ADD(OpcodeParameter::Register_I8(reg1, val)), bus);
},
_ => {},
},
Opcode::SUB(params) => {
self.registers.increment(Register::PC, 1);
let mut register = Register::A;
@ -595,6 +616,27 @@ impl CPU {
self.registers.set_flag(FlagRegister::Carry, carry);
self.registers.set_flag(FlagRegister::HalfCarry, sub_half_carry(val1.to_be_bytes()[1], val2.to_be_bytes()[1]));
},
Opcode::SBC(params) => match params {
OpcodeParameter::Register_Register(reg1, reg2) => {
if self.registers.get_flag(FlagRegister::Carry) {
self.registers.decrement(reg1, 1);
}
self.exec(Opcode::SUB(OpcodeParameter::Register_Register(reg1, reg2)), bus);
},
OpcodeParameter::Register_U8(reg1, val) => {
if self.registers.get_flag(FlagRegister::Carry) {
self.registers.decrement(reg1, 1);
}
self.exec(Opcode::SUB(OpcodeParameter::Register_U8(reg1, val)), bus);
},
OpcodeParameter::Register_I8(reg1, val) => {
if self.registers.get_flag(FlagRegister::Carry) {
self.registers.decrement(reg1, 1);
}
self.exec(Opcode::SUB(OpcodeParameter::Register_I8(reg1, val)), bus);
},
_ => {},
},
// Increment by 1
Opcode::INC(affect_flags, register) => {
let prev_value = self.registers.get(register);

2
src/utils.rs
View File

@ -1,4 +1,4 @@
#[derive(Debug)]
#[derive(Debug, Copy, Clone)]
pub enum BitIndex {
I0,
I1,