1. A circuit arrangement, comprising: a pseudorandom number generator (PRNG) configured to generate a pseudorandom number; an execution unit configured to execute instructions from an instruction set, wherein the execution unit is configured to execute a first instruction from the instruction set using a plurality of operands; and control logic coupled to the execution unit and configured to supply the plurality of operands to the execution unit during execution of the first instruction, the control logic further configured to selectively output to the execution unit a pseudorandom number generated by the PRNG for use as a first operand among the plurality of operands during execution of the first instruction by the execution unit, wherein the execution unit is configured to execute the first instruction by performing an arithmetic operation using the pseudorandom number and a second operand identified by the first instruction.