1. A computer processor comprising: an instruction memory comprising instructions making up an instruction set for the processor, wherein the instruction set includes data processing instructions, each data processing instruction comprising an opcode portion carrying dynamic configuration information and operand data portion; a decode unit comprising control circuitry configured to receive and decode a sequence of instructions supplied from the instruction memory, including said data processing instructions, and control the components of the processor in accordance with each of the decoded instructions; a configurable execution unit comprising operators capable of being dynamically configured at the level of processing multi-bit operand values, on an instruction by instruction basis, responsive to the configuration information carried in the opcode portion of each data-processing instruction, wherein said operators are provided in one or more dynamically configurable operator modules, said operators being configured to separately receive (i) at least one input operand responsive to the operand data in said data processing instruction and (ii) operator configuration settings defining aspects of the function and/or behavior of said configurable operator module at the level of processing multi-bit operands, wherein said operator configuration settings are derived from the dynamic configuration information carried in the opcode portion of said data processing instruction and wherein said execution unit comprises a configurable switching fabric having connectivity defined at least in part by pseudo static control information provided independently of the instruction carrying the dynamic configuration information and; and a programmable look up table that comprises said pseudo static control information and configured to receive said dynamic configuration information from the opcode portion of respective data processing instructions and being adapted translate said dynamic configuration information into operator configuration settings applying to said configurable operators.