1. A processing apparatus, comprising: an input means for inputting data; a register file for storing said input data; at least a first and a second issue slot, wherein each issue slot comprises a plurality of functional units; and wherein the processing apparatus is conceived for processing data retrieved from the register file based on control signals generated from a set of instructions being executed in parallel, the set of instructions comprising at least a first and a second instruction, the first issue slot being controlled by a first control word corresponding to the first instruction and the second issue slot being controlled by a second control word corresponding to the second instruction, characterized in that the width of the first control word is different from the width of the second control word.