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- Path: sparky!uunet!mcsun!sun4nl!cwi.nl!dik
- From: dik@cwi.nl (Dik T. Winter)
- Newsgroups: comp.lang.misc
- Subject: Re: Safety. Was: Re: Pointers
- Message-ID: <8311@charon.cwi.nl>
- Date: 11 Dec 92 22:59:50 GMT
- References: <Bz0Iy5.A9K@mentor.cc.purdue.edu> <1g6fl6INNktf@early-bird.think.com> <Bz1rFw.9s1@mentor.cc.purdue.edu>
- Sender: news@cwi.nl
- Organization: CWI, Amsterdam
- Lines: 21
-
- In article <Bz1rFw.9s1@mentor.cc.purdue.edu> hrubin@pop.stat.purdue.edu (Herman Rubin) writes:
- > The hardware has
- > deteriorated, except for speed, for the number theorist; when Lehmer
- > wrote his criticism, virtually all computers had double-length integer
- > arithmetic.
- You asserted that before, and I asked you to name a few computers from the
- beginning of Fortran that had those capabilities. I never saw a response.
- Can you respond now?
- > Many computers today do not have decent integer arithmetic
- > at all. The CRAYs are arch examples of that; one has to do a lot of
- > extracting fields, packing and unpacking to even get at 24x24 -> 48
- > multiplication.
- What extracting, packing and unpacking?
- S3 S1<24
- S4 S2<24
- S5 S3*S4
- and look: the 48 bit product of the 24 bit quantities in S1 and S2 is now
- in S5. (And what where your complaints about the syntax for assemblers?)
- --
- dik t. winter, cwi, kruislaan 413, 1098 sj amsterdam, nederland
- home: bovenover 215, 1025 jn amsterdam, nederland; e-mail: dik@cwi.nl
-