Tuple construction from data packets

In one approach for processing a data packet, in at least one stage of a plurality of stages of a pipeline circuit, a respective packet field value is extracted from the data packet. In each stage of the plurality of stages, a respective tuple field value is inserted into a respective tuple register of the stage at a respective offset. The respective tuple field value in the at least one stage is based on the respective packet field value. In each stage of the plurality of stages except a last one of the stages, the contents of the respective tuple register of the stage are provided as input to a next one of the stages.