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A high speed register file for use by an instruction processor suitable for reduced instruction-set computers (RISCs) is disclosed which is preferably used with an efficient register allocation method. The register file facilitates the passing of parameters between procedures by dynamically providin

A high speed register file for use by an instruction processor suitable for reduced instruction-set computers (RISCs) is disclosed which is preferably used with an efficient register allocation method. The register file facilitates the passing of parameters between procedures by dynamically providing overlapping registers which are accessible to both procedures. Each procedure also has a set of “local”registers assigned to it which are inaccessible from other procedures. The register file is divided into a number of blocks and a protection register stores a word which proscribes access by a particular procedure or task to certain blocks. In this manner, an instruction processor using the register file can operate on multiple tasks maintaining the integrity of each from undesired changes occuring in the others.

대표청구항 ▼

A method of dynamic execution-time storage allocation by a reduced instruction set digital processor control which cyclically executes instructions each including a plurality of operand portions, predetermined sequences of said instructions forming a procedure, said control having a file of register

A method of dynamic execution-time storage allocation by a reduced instruction set digital processor control which cyclically executes instructions each including a plurality of operand portions, predetermined sequences of said instructions forming a procedure, said control having a file of registers each having a location designator, said control having a stack pointer for said storage allocation, said method comprising the steps of: (a) setting said stack pointer upon entry to a procedure; (b) for each of said operand portions of said instructions within said procedure calculating an effective operand register designation relative to said stack pointer; and (c) resetting said stack pointer upon entry to a procedure called by said procedure entered at step (a) so as to provide a user-selectable communication overlap between the storage allocated for the procedure entered in step (a) and the storage allocated for said procedure called by said procedure.