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- Newsgroups: comp.arch
- Path: sparky!uunet!stanford.edu!CSD-NewsHost.Stanford.EDU!SAIL.Stanford.EDU!andy
- From: andy@SAIL.Stanford.EDU (Andy Freeman)
- Subject: Re: Any use for Branch if Even/Odd ?
- Message-ID: <1992Dec14.203631.16388@CSD-NewsHost.Stanford.EDU>
- Sender: news@CSD-NewsHost.Stanford.EDU
- Organization: Computer Science Department, Stanford University.
- References: <endecotp.723992157@cs.man.ac.uk> <Bz2MMK.GIL@world.std.com> <id.08RV.WYB@ferranti.com>
- Date: Mon, 14 Dec 1992 20:36:31 GMT
- Lines: 11
-
- In article <id.08RV.WYB@ferranti.com> peter@ferranti.com (peter da silva) writes:
- >Close. As I recall, DEC is very fond of using even/odd for true/false values,
- >and the VMS interface definition has a lot of even/odd status returns, so it's
- >likely these instructions are to make it run VMS real good.
-
- Does anyone know why they preferred even/odd to >=0/<0? Sometimes one
- has to test the sign bit, so why not use it whenever one can use any
- bit to split things into two classes?
-
- -andy
- --
-