use crate::color;
use crate::emu::Emu;
use iced_x86::Instruction;

pub fn execute(emu: &mut Emu, ins: &Instruction, instruction_sz: usize, _rep_step: bool) -> bool {
    emu.show_instruction(color!("Green"), ins);

    let value0 = emu.get_operand_xmm_value_128(ins, 0, true).unwrap_or(0);
    let value1 = emu.get_operand_xmm_value_128(ins, 1, true).unwrap_or(0);
    let mut result = 0u128;

    for i in 0..16 {
        let mask = 0xFFu128;
        let shift = i * 8;
        let byte0 = ((value0 >> shift) & mask) as i8;
        let byte1 = ((value1 >> shift) & mask) as i8;
        let diff = byte0.saturating_sub(byte1);

        result |= (diff as u128 & mask) << shift;
    }

    emu.set_operand_xmm_value_128(ins, 0, result);
    true
}
