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- From: jesup@cbmvax.commodore.com (Randell Jesup)
- Newsgroups: comp.sys.amiga.programmer,comp.sys.amiga.hardware
- Subject: Re: CISC and RISC
- Message-ID: <37977@cbmvax.commodore.com>
- Date: 16 Dec 92 22:36:54 GMT
- References: <amipb.04wr@amipb.gna.org> <37844@cbmvax.commodore.com> <Bz8FD1.Dxt@ns1.nodak.edu> <BzByvD.FA9@news.cs.andrews.edu> <37968@cbmvax.commodore.com>
- Reply-To: jesup@cbmvax.commodore.com (Randell Jesup)
- Organization: Commodore, West Chester, PA
- Lines: 31
-
- daveh@cbmvax.commodore.com (Dave Haynie) writes:
- >>RISC - Reduced Instruction Set Computer
- >>CISC - Complex Instruction Set Computer
- >
- >Keep in mind that the term "CISC" was coined by proponents of RISC, in order
- >to make it sound like there's some sharp dividing line. There isn't. The
- >differences are more related to the particular designs in vogue at the time any
- >particular microprocessor family was created.
-
- Quite true. In fact I've said in comp.arch a few times that the line
- has and will continue to become blurrier, as the ability to throw transistors
- at the problem increases (and as processors outrun their memories). I.e.
- RISCs are getting more and more complex instructions and execution, and
- CISCs are getting close to 1 cycle per instruction and are going superscalar,
- and you have things like the Hobbit (no registers at all, designed for
- efficient execution of C, fast).
-
- Or you can just consider CISC to mean pre-85 architectures, and RISC
- to mean post-85 architectures (yes, I know, vast simplification with
- a number of exceptions, but mostly true). Or you can think of RISC as merely
- a pseudonym for designing your architecture to meet the current technology
- at the time, and CISC to mean making old designs fit into new technologies.
- Etc, etc. Don't get too hung up on terminology: all that really matters is
- performance (and price).
-
- --
- To be or not to be = 0xff
- -
- Randell Jesup, Jack-of-quite-a-few-trades, Commodore Engineering.
- {uunet|rutgers}!cbmvax!jesup, jesup@cbmvax.cbm.commodore.com BIX: rjesup
- Disclaimer: Nothing I say is anything other than my personal opinion.
-