Function mulh

crates/virtual-machine/src/cpu/alu.rs:133–135

(a: u64, b: u64)

/// Upper 64 bits of signed*signed product.
#[inline]
pub fn mulh(a: u64, b: u64) -> u64 {
    ((a as i64 as i128).wrapping_mul(b as i64 as i128) >> 64) as u64
}

/// Upper 64 bits of unsigned*unsigned product.
#[inline]