ID:18013 Ignored <number> CARRY_SUM primitives -- cannot place fan-in logic in single logic cell

CAUSE: The Quartus Prime software ignored the specified number of CARRY_SUM primitives because they contain fan-in from logic that does not fit in a single logic cell. All fan-in logic in CARRY_SUM primitives must fit on a single logic cell.

ACTION: Modify the design by simplifying the logic that feeds the CARRY_SUM primitive to contain fewer inputs.