Method and system for selective support of non-architected instr

Details Method and system for selective support of non-architected instr Method and system for selective support of non-architected instr

1995-02-10

1998-05-26

Lim, Krisna

395568, G06F 930

Patent

active

057581410

ABSTRACT:
A method and system for permitting the selective support of non-architected instructions within a superscalar processor system. A special access bit within the system machine state register is provided and set in response to each initiation of an application during which execution of non-architected instructions is desired. Thereafter, each time a non-architected instruction is decoded the status of the special access bit is determined. The non-architected instruction is executed in response to a set state of the special access bit. The illegal instruction program interrupt is issued in response to an attempted execution of a non-architected instruction if the special access bit is not set. In this manner, for example, complex instruction set computing (CISC) instructions may be selectively enabled for execution within a reduced instruction set computing (RISC) data processing system while maintaining full architectural compliance with the reduced instruction set computing (RISC) instructions.

REFERENCES:
patent: 3737867 (1973-06-01), Cavin et al.
patent: 4754393 (1988-06-01), Kitson et al.
patent: 4878174 (1989-10-01), Watkins et al.
patent: 4928223 (1990-05-01), Dao et al.
patent: 4992934 (1991-02-01), Portanova et al.
patent: 5095426 (1992-03-01), Senta et al.
patent: 5155819 (1992-10-01), Watkins et al.
patent: 5179691 (1993-01-01), O'Brien et al.
patent: 5201043 (1993-04-01), Crawford et al.
patent: 5210832 (1993-05-01), Maier et al.
patent: 5341506 (1994-08-01), Nohmi et al.
patent: 5430862 (1995-07-01), Smith et al.
patent: 5481693 (1996-01-01), Blomgren et al.
"High Performance Dual Architecture Processor", Disclosure Bulletin, IBM, vol. 36, No. 02, pp. 231-234, Feb. 1993.

Affiliated with

Also associated with

Rating

Method and system for selective support of non-architected instr 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 and system for selective support of non-architected instr, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for selective support of non-architected instr will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1976279