Function NMUL

bitvm/src/pseudo.rs:156–169

(n: u32)

}

pub fn NMUL(n: u32) -> Script {
    let n_bits = u32::BITS - n.leading_zeros();
    let bits = (0..n_bits).map(|i| 1 & (n >> i)).collect::<Vec<_>>();
    script! {
        if n_bits == 0 { OP_DROP 0 }
        else {
            for i in 0..bits.len()-1 {
                if bits[i] == 1 { OP_DUP }
                { crate::pseudo::OP_2MUL() }
            }
            for _ in 1..bits.iter().sum() { OP_ADD }
        }
    }
}