Electrical computers and digital processing systems: processing – Processing architecture – Superscalar
Patent
1998-07-14
2000-07-25
Coleman, Eric
Electrical computers and digital processing systems: processing
Processing architecture
Superscalar
712215, G06F 938
Patent
active
060947160
ABSTRACT:
An apparatus for accelerating move operations includes a lookahead unit which detects move instructions prior to the execution of the move instructions (e.g. upon selection of the move operations for dispatch within a processor). Upon detecting a move instruction, the lookahead unit signals a register rename unit, which reassigns the rename register associated with the source register to the destination register. In one particular embodiment, the lookahead unit attempts to accelerate moves from a base pointer register to a stack pointer register (and vice versa). An embodiment of the lookahead unit generates lookahead values for the stack pointer register by maintaining cumulative effects of the increments and decrements of previously dispatched instructions. The cumulative effects of the increments and decrements prior to a particular instruction may be added to a previously generated value of the stack pointer register to generate a lookahead value for that particular instruction. For such an embodiment, reassigning the rename register as described above may thereby provide a valid value for the stack pointer register, and hence may allow for the generation of lookahead stack pointer values for instructions subsequent to the move instruction to proceed prior to execution of the move instruction. The present embodiment of the register rename unit may also assign the destination rename register selected for the move instruction to the source register of the move instruction (i.e. the rename tags for the source and destination are "swapped").
REFERENCES:
patent: 5233696 (1993-08-01), Suzuki
patent: 5345569 (1994-09-01), Tran
patent: 5574935 (1996-11-01), Vidwans et al.
patent: 5623628 (1997-04-01), Brayton et al.
patent: 5632023 (1997-05-01), White et al.
patent: 5664215 (1997-09-01), Burgess
patent: 5696955 (1997-12-01), Goddard et al.
patent: 5768610 (1998-06-01), Pflum
patent: 5857089 (1999-01-01), Goddard et al.
patent: 5892936 (1999-04-01), Tran
patent: 5933618 (1999-08-01), Tran
patent: 5987592 (1999-11-01), Mahalingaiah
Search Report for International Application No. PCT/US 99/01047 mailed May 14, 1999.
Advanced Micro Devices , Inc.
Coleman Eric
Merkel Lawrence J.
LandOfFree
Register renaming in which moves are accomplished by swapping re does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Register renaming in which moves are accomplished by swapping re, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Register renaming in which moves are accomplished by swapping re will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1343839