MULTIPLE ISA SUPPORT BY A PROCESSOR USING PRIMITIVE OPERATIONS

A processor is provided with a datapath and control logic to control the datapath to selectively effectuate execution of instructions of multiple ISA. In some embodiments, execution of the instructions of the different ISA are effectuated by selectively executing primitive operations (POP) of different ISA implementing POP collections. In some embodiments, the processor further includes at least one ISA selector accessible to the control logic to facilitate the control logic in controlling the datapath to selectively effectuate execution of the instructions of the different ISA. In some embodiments, the processor further includes an ISA library, storing and supplying, e.g. different collections of primitive operations implementing instructions of the different ISA, and logical to physical mappings of the different ISA.