1. An apparatus, comprising: an array of memory cells coupled to sensing circuitry and to a plurality of sense lines; the sensing circuitry comprising a sense amplifier and a compute component coupled to the plurality of sense lines, wherein the sense amplifier comprises a primary latch and the compute component comprises a secondary latch; and a controller configured to use the sense amplifier and the compute component to cause: summing, in parallel and using the primary latch and the secondary latch, of data values corresponding to respective ones of a plurality of first vectors stored in memory cells of the array as a data value sum representing a population count thereof, wherein a second vector is stored as the plurality of first vectors, and wherein each first vector of the plurality of first vectors is stored in respective memory cells of the array that are coupled to a respective sense line of the plurality of sense lines; storing the data value sums in the array of memory cells; and iteratively summing, in parallel and using the primary latch and the secondary latch, of the stored data value sums corresponding to the plurality of first vectors to provide a single data value sum corresponding to the second vector.