Optimized IR:
/*******************************************************
 *                       WARNING                       *
 *  Solidity to Yul compilation is still EXPERIMENTAL  *
 *       It can result in LOSS OF FUNDS or worse       *
 *                !USE AT YOUR OWN RISK!               *
 *******************************************************/

object "C_6" {
    code {
        {
            mstore(64, 128)
            if callvalue() { revert(0, 0) }
            codecopy(0, dataoffset("C_6_deployed"), datasize("C_6_deployed"))
            return(0, datasize("C_6_deployed"))
        }
    }
    object "C_6_deployed" {
        code {
            {
                mstore(64, 128)
                if iszero(lt(calldatasize(), 4))
                {
                    let selector := shift_right_224_unsigned(calldataload(0))
                    pop(selector)
                }
                pop(iszero(calldatasize()))
                revert(0, 0)
            }
            function shift_right_224_unsigned(value) -> newValue
            { newValue := shr(224, value) }
        }
    }
}