US 5,517,664 A · RISC system with instructions which include register area and displacement portions for accessing data stored in registers during processing

Abstract

In a computer system equipped with a large number of registers which have an access time much shorter than that of a main memory, a register designating address part in which the assignment of an area register having a register address of a register area as its value and the assignment of a register displacement value expressing a relative register address within the register area are combined is provided in each instruction so that, even when physical registers are increased, save and restore of registers attendant upon task switches, etc. may be lessened to attain a raised speed of program run processing. Besides, an address part for designating the main memory is provided in the same instruction.

Claims24

Dependent claims

An information processing apparatus comprising main memory means having a main memory address space, main memory access means for accessing said main memory means, a register block having a register address space and furnished with general registers and an area register in combination, instruction decode means for decoding an instruction which has an area register part assigning the area register indicating a position of a register area included in said register block and a register displacement part for assigning a relative register position within the register area lying at the indicated position, register access means for accessing the register lying at the relative register position in accordance with an output of said instruction decode means, and arithmetic means for operating data from said main memory means and the accessed register.

An information processing apparatus comprising main memory means having a main memory address space;

a register block having a register address space and furnished with area registers;
instruction decode means for decoding an instruction having an area register part which assigns any of the plurality of registers for indicating a position of a register bank to be used among a plurality of register banks that form register areas included in said register block and consisting of predetermined equal numbers of registers, a register displacement part which assigns a relative register position within the register bank lying at the indicated position, and a main memory designator part which assigns an address of said main memory means;
register access means for accessing the register lying at the relative register position in accordance with an output of said instruction decode means;
main memory access means for accessing said main memory means in accordance with another output of said instruction decode means;
and arithmetic means for operating data from said main memory means and said register block.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

08/459,965Filed 2 Jun 1995 · continuation

Priority

JP 61-8455214 Apr 1986

Granted

14 May 1996

Term ends

Not estimatedThe source records don’t support an estimate.

Classification9 codes

G06F 9/30138
Organisation of register space, e.g. banked or distributed register file: extension of register space, e.g. register cache
G06F 9/30105
Register arrangements: register structure
G06F 9/30127
According to context, e.g. thread buffers: register windows
G06F 9/30134
Organisation of register space, e.g. banked or distributed register file: register stacks; shift registers

Family

Serial37,843Parent of this continuation · filed 13 Apr 1987

Serial945,930Parent of this continuation · filed 17 Sep 1992

US 5,214,786 AParent of this continuation · filed 25 May 1993

Serial183,830Parent of this continuation · filed 21 Jan 1994

US 5,307,502 AParent of this continuation · filed 26 Apr 1994

US 5,450,610 AParent of this continuation

US 5,517,664 AThis patent

From the US filing history. Foreign family members aren’t listed.

RISC system with instructions which include register area and displacement portions for accessing data stored in registers during processing

Life of this patent

RISC system with instructions which include register area and displacement portions for accessing data stored in registers during processing

Life of this patent

Abstract

Claims24