Method for decoding sequences of guest instructions for a host c

Details Method for decoding sequences of guest instructions for a host c Method for decoding sequences of guest instructions for a host c

1995-06-07

1997-04-22

Treat, William M.

Boots, shoes, and leggings

395500, 395800, 364DIG1, 364DIG2, G06F 9455

Patent

active

056236174

ABSTRACT:
Emulator performance can be improved by recognizing repeated sequences of the same instruction, or commonly groups of instructions. For example, it is very common to see a three instruction sequence of MOVEM, UNLK A6, and RTS instructions for a 68020 processor in procedure exit code. By looking for these sequences, and combining the operations performed by the separate sequences, overhead of decoding and dispatching the individual instructions in the sequence can be eliminated, and performance improved. Common instruction sequences or repeated sequences in a guest program are detected during emulation of the guest program on a host processor, and performance of the emulation optimized based on the detected sequences. Thus, the emulation logic comprising host instructions embedded within a particular emulation program for a particular guest instruction, detects a particular sequence of guest instructions and in response to detection of the particular sequence bypasses the dispatch logic for guest instructions within the particular sequence. The sequences detected can comprise repeated guest instructions, or common sequences of two or more than two guest instructions.

REFERENCES:
patent: 3698007 (1972-10-01), Malcolm et al.
patent: 3972029 (1976-07-01), Bailey, Jr.
patent: 4087857 (1978-05-01), Joyce et al.
patent: 4262330 (1981-04-01), Berglund et al.
patent: 4307445 (1981-12-01), Tredennick et al.
patent: 4429361 (1984-01-01), Maccianti et al.
patent: 4587612 (1986-05-01), Fisk et al.
patent: 4635188 (1987-01-01), Williamson et al.
patent: 4722047 (1988-01-01), Chan et al.
patent: 4722050 (1988-01-01), Lee et al.
patent: 4727480 (1988-02-01), Albright et al.
patent: 4791557 (1988-12-01), Angel et al.
patent: 4812972 (1989-03-01), Chastain et al.
patent: 4812975 (1989-03-01), Adachi et al.
patent: 4839797 (1989-06-01), Katori et al.
patent: 4841476 (1989-06-01), Mitchell et al.
patent: 4951195 (1990-08-01), Fogg, Jr. et al.
patent: 4972317 (1990-11-01), Buonomo et al.
patent: 4992934 (1991-02-01), Portanova et al.
patent: 5070475 (1991-12-01), Normoyle et al.
patent: 5077657 (1991-12-01), Cooper et al.
patent: 5167023 (1992-11-01), de Nicolas et al.
patent: 5235686 (1993-08-01), Bosshart
patent: 5247624 (1993-09-01), Koumoto et al.
patent: 5432935 (1995-07-01), Kato et al.
Vahlstrom, "Microprogramming Emulation of a General-Purpose Processor", Electrical Design News, vol. 20, No. 6, Mar. 20, 1975, pp. 61-66.
Sherman, "Attention to Basics Reduces Risk in Ada Compiler Choice", Computer Design, vol. 25, No. 12, Jun. 15, 1986, pp. 87-90.
Threaded code interpreter for Object code.

Affiliated with

Also associated with

Rating

Method for decoding sequences of guest instructions for a host c does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for decoding sequences of guest instructions for a host c, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for decoding sequences of guest instructions for a host c will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-348730