1. An article of manufacture comprising: at least one computer usable medium having computer readable program code logic to control instruction execution in a processing environment, said computer readable program code logic when executing performing the following: executing an instruction routine of an instruction stream; employing, in response to executing the instruction routine, a single test to determine whether processing is to continue to another instruction routine of the instruction stream or fall through to a test set; and executing the another instruction routine or the test set, in response to the determination.