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- From: saunders@cs.arizona.edu (Richard T. Saunders)
- Newsgroups: comp.sys.amiga.programmer,comp.sys.amiga.hardware
- Subject: Re: CISC and RISC
- Message-ID: <28361@optima.cs.arizona.edu>
- Date: 16 Dec 92 20:32:02 GMT
- References: <37844@cbmvax.commodore.com> <Bz8FD1.Dxt@ns1.nodak.edu> <BzByvD.FA9@news.cs.andrews.edu>
- Sender: news@cs.arizona.edu
- Followup-To: comp.sys.amiga.programmer
- Organization: U of Arizona CS Dept, Tucson
- Lines: 49
-
- In article <BzByvD.FA9@news.cs.andrews.edu> adap@edmund.cs.andrews.edu (Edsel Adap) writes:
- >In article <Bz8FD1.Dxt@ns1.nodak.edu> dewald@plains.NoDak.edu (Eric Dewald) writes:
- >>Why should computer makers go from CISC to RISC?
- >>
-
- Talk about a loaded question! ;v)
-
- >
- >RISC - Reduced Instruction Set Computer
- >CISC - Complex Instruction Set Computer
- >
-
- [Many useful and good points deleted for bandwidth reasons]
-
- I would like to add my 2 cents to this.
-
- The RISC direction is, in some sense, a reaction to machines that
- were _TOO_ CISC, such as the VAX. When there were so many ways
- to accomplish one task, it was difficult to "optimize" hardware
- because it wasn't quite clear what the ramifications were.
-
- So, "Simplify, simplify, simplify". Try to discover only the
- MINIMAL needs of the hardware, then hardware optimization (just as pre-fetching
- instructions, data forwarding, etc) would be much simpler. And, more
- importantly, the ISSUES involved in hardware optimization would
- be better understoood.
-
- This technology could then be applied to CISC chips in the future.
- That is, until they discover "new and better ideas" they want
- to incorporate into their chips. Then they'll "simplify, simplify,
- simplify" again for a better understanding.
-
- In other words:
-
- REPEAT
-
- Simplify until you understand as well as possible
-
- Incorporate simple ideas into more useful "packages"---These
- packages will certainally be more complex in order to be useful
-
- UNTIL (pi=3)
-
- I predict we'll see the RISC vs. CISC war again in about, oh, 10
- years in a slightly different form.
-
-
-
- saunders@caslon.cs.arizona.edu | "This is NOT Mel Torme!" - Top Secret
-