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[cpu] Implement some ALU instructions

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Atreya Bain
2024-03-04 20:14:43 +05:30
parent 9329d4e51a
commit 1a2be21027
1 changed files with 30 additions and 7 deletions
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37
src/device/device.rs
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@@ -120,14 +120,37 @@ impl Device {
Instruction::RandomOr(_, _) => {}
Instruction::SkipIfKeyPressed(_) => {}
Instruction::SkipIfKeyNotPressed(_) => {}
Instruction::Set(_, _) => {}
Instruction::Or(_, _) => {}
Instruction::And(_, _) => {}
Instruction::Xor(_, _) => {}
Instruction::Add(_, _) => {}
Instruction::Sub(_, _) => {}
Instruction::Set(x, y) => {
self.registers.v[x] = self.registers.v[y];
}
Instruction::Or(x, y) => {
self.registers.v[x] |= self.registers.v[y];
}
Instruction::And(x,y) => {
self.registers.v[x] &= self.registers.v[y];
}
Instruction::Xor(x,y) => {
self.registers.v[x] ^= self.registers.v[y];
}
Instruction::Add(x,y) => {
let left = self.registers.v[x];
let (wrapped_addition_result, is_overflow) = left.overflowing_add(self.registers.v[y]);
self.registers.v[x] = wrapped_addition_result;
self.set_flag_register(is_overflow);
}
Instruction::Sub(x,y) => {
let left = self.registers.v[x];
let (wrapped_subtraction_result, is_overflow) = left.overflowing_sub(self.registers.v[y]);
self.registers.v[x] = wrapped_subtraction_result;
self.set_flag_register(is_overflow);
}
Instruction::RShift(_, _) => {}
Instruction::RSub(_, _) => {}
Instruction::RSub(x, y) => {
let left = self.registers.v[y];
let (wrapped_subtraction_result, is_overflow) = left.overflowing_sub(self.registers.v[x]);
self.registers.v[x] = wrapped_subtraction_result;
self.set_flag_register(is_overflow);
}
Instruction::LShift(_, _) => {}
};
}