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- From: prener@watson.ibm.com (Dan Prener)
- Subject: Re: Superscalar vs. multiple CPUs ?
- Sender: news@watson.ibm.com (NNTP News Poster)
- Message-ID: <PRENER.92Dec13030928@prener.watson.ibm.com>
- In-Reply-To: norm@netcom.com's message of Sun, 13 Dec 1992 06:39:30 GMT
- Date: Sun, 13 Dec 1992 08:09:28 GMT
- Disclaimer: This posting represents the poster's views, not necessarily those of IBM
- References: <1992Dec10.173032.1418@twisto.eng.hou.compaq.com>
- <1992Dec11.060038.27494@netcom.com>
- <PRENER.92Dec12010123@prener.watson.ibm.com>
- <1992Dec13.063930.8687@netcom.com>
- Nntp-Posting-Host: prener.watson.ibm.com
- Organization: IBM T.J. Watson Research Center, Hawthorne, New York
- Lines: 26
-
- In article <1992Dec13.063930.8687@netcom.com> norm@netcom.com (Norman Hardy) writes:
-
- > In article <PRENER.92Dec12010123@prener.watson.ibm.com> prener@watson.ibm.com (Dan Prener) writes:
- > >In article <1992Dec11.060038.27494@netcom.com> norm@netcom.com (Norman Hardy) writes:
- > >
- > >> How about sharing expensive functional units (multiply, divide,
- > >> DES) between processors on the same chip. This gives the economic
- > >> advantages of heterogeneous processors (division of labor) without
- > >> the software pain. The processors would appear to the operating
- > >> system as CPUs sharing memory. Indeed this approach makes special
- > >> purpose hardware more attractive as functional units.
- > >
- > >Doesn't that make saving the state of a processor somewhat complicated?
- > >--
- > > Dan Prener (prener@watson.ibm.com)
-
- > I see no need to change the programmer's model in order to share
- > functional units. Functional units have no state if you interrupt
- > between instructions as in most architectures.
-
- [ ... and more ... ]
-
- I was thinking of situations such as a floating-point functional unit
- having state that includes the current rounding mode.
- --
- Dan Prener (prener@watson.ibm.com)
-