{
    let x := calldataload(0)
    let a := and(0xff, shr(248, shl(248, shr(248, x))))
    let b := shr(12, shl(8, and(x, 0xf0f0)))
}
// ====
// EVMVersion: >byzantium
// step: expressionSimplifier
// ----
// {
//     let x := calldataload(0)
//     let a := shr(248, x)
//     let b := and(shr(4, x), 3855)
// }