EXTENDING THE NUMBER OF GENERAL PURPOSE REGISTERS AVAILABLE TO INSTRUCTIONS.

摘要

A computer employs a set of General Purpose Registers (GPRs). Each GPR comprises a plurality of portions. Programs such as an Operating System and Applications operating in a Large GPR mode, access the full GPR, however programs such as Applications operating in Small GPR mode, only have access to a portion at a time. Instruction Opcodes, in Small GPR mode, may determine which portion is accessed.