1. An apparatus, comprising: an execution unit configured to execute instructions including one or more fields; and a register file configured to store operands defined by the one or more fields and configured to store results of execution of the instructions in a destination defined by the one or more fields, wherein the register file includes: a first register set having a register configured to store data of a single data type; and a second register set having a register configured to store data of a plurality of data types, and wherein the register file is responsive to the one or more fields in at least one of the instructions to retrieve an operand of the at least one of the instructions from, or to store a result of the at least one of the instructions into, one of the registers of the first register set or the second register set as defined by the one or more fields of the at least one of the instructions.