ID:18015 Ignored <number> CARRY_SUM primitives -- logic cell requires more inputs than it can contain

CAUSE: The Quartus Prime software ignored the specified number of CARRY_SUM primitives because there are not enough LUT inputs in the logic cell. The current design requires more fan-in to the LUT inputs in the logic cell than can be implemented in the logic cell.

ACTION: Check the fan-in to the logic feeding the CARRY_SUM primitive and modify the design by removing LUT inputs to the logic cell, or by modifying the fan-in to the logic cell so it can share more signals.