The main goal of the Tag Filter Cache is to reduce the
number of tags that are compared on each cache access and
also the number of ways that are accessed in parallel in the
data array. The aim is to reduce dynamic power consumption
in these structures. In a typical cache access, to check if the
searched block is in cache, the entire tags in the target set are
compared and, at most, one of those tags will match, while the
other ones will mismatch.