path: root/src/cpu/isa_b.rs

/*
	Copyright 2021-2023 Gabriel Jensen.

	This file is part of Luma.

	Luma is free software: you can redistribute it
	and/or modify it under the terms of the GNU
	Affero General Public License as published by
	the Free Software Foundation, either version 3
	of the License, or (at your option) any later
	version.

	Luma is distributed in the hope that it will be
	useful, but WITHOUT ANY WARRANTY; without even
	the implied warranty of MERCHANTABILITY or
	FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	Affero General Public License for more details.

	You should have received a copy of the GNU
	Affero General Public License along with Luma.
	If not, see <https://www.gnu.org/licenses/>.
*/

use crate::log;
use crate::cpu::{Cpu, take_state_mut};

impl Cpu {
	pub(super) fn isa_b(&mut self, imm: i32) {
		take_state_mut!(state, self);

		let mut target = state.read_register(0xF).wrapping_add_signed(imm);

		log!("b {target:#X}");

		target = target.wrapping_add(self.instruction_size);
		state.write_register(0xF, target);
	}
}