ID:18750 The Allow Register Merging assignment setting is not available for the targeted device family, and will be ignored.

CAUSE: Your project contains the Allow Register Merging assignment, but this setting is not available for the targeted device family.

ACTION: No action is required. To eliminate this warning, remove the assignment from your Quartus Settings File (.qsf): ALLOW_REGISTER_MERGING. To prevent register merging in synthesis, set the Remove Duplicate Registers setting to Off.