...ddress(offset) -> v {
v := decodeAsUint(offset)
if iszero(iszero(and(v, not(0xffffffffffffffffffffffffffffffffffffffff)))) {
revert(0, 0)
}
}
function decodeAsUint(offset) -> v {
let pos := add(4, mul(offset, 0x20))
if lt(calldatasize(), add(pos, 0x20)) {
...