Idiom recognizer within a register alias table

Details Idiom recognizer within a register alias table Idiom recognizer within a register alias table

1994-03-01

1995-11-28

Geckil, Mehmet

Boots, shoes, and leggings

395500, 364DIG1, 3642551, 3642557, 364259, G06F 700

Patent

active

054716330

ABSTRACT:
A register alias table unit (RAT) with an idiom recognition mechanism for overriding partial width conditions stalls is described. A partial width stall condition occurs during the RAT renaming process when a logical source register being renamed is larger than the corresponding physical source register pointed to by a renaming table. An idiom recognizer detects uops that zero their logical destination register and sets and clears zero bits in an iRAT array accordingly. The zero bits indicate which portions of an entry's physical source register are known to be zeros. A partial width stall override mechanism overrides a partial width stall condition when the zero bits for the physical source register causing the partial width stall indicate that the "missing" portion of the physical source register contains zeros. The performance of a microprocessor implementing such a RAT renaming mechanism with an idiom recognizer is improved because common partial width stalls are avoided.

REFERENCES:
patent: 4992934 (1991-02-01), Portanova et al.
patent: 4992938 (1991-02-01), Cooke et al.
patent: 5107415 (1992-04-01), Sato et al.
patent: 5197132 (1993-03-01), Steely et al.
patent: 5280593 (1994-01-01), Bullions, III et al.
patent: 5355457 (1994-10-01), Shebanow et al.
"Metaflow Architecture", Popescu, et al., pp. 10-13 & 63-73, IEEE Micro, 1991 IEEE, Metaflow Technologies, Inc.
"PA7200: A PA-RISC Processor with Integrated High Performance MP Bus Interface", Kurpanek, et al., pp. 375-382, 1994 IEEE, Hewlett-Packard Company.
Author, Mike Johnson, entitled Superscalar Microprocessor Design, Advance Micro Devices, Prentice Hall Series in Innovative Technology, 1991, pp. 1-289.

Affiliated with

Also associated with

Rating

Idiom recognizer within a register alias table does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Idiom recognizer within a register alias table, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Idiom recognizer within a register alias table will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2021106