Path: utzoo!attcan!uunet!auspex!guy
From: guy@auspex.UUCP (Guy Harris)
Newsgroups: comp.arch
Subject: Re: A simple question on RISC
Message-ID: <464@auspex.UUCP>
Date: 17 Nov 88 16:57:08 GMT
References: <6544@xanth.cs.odu.edu> <75577@sun.uucp> <1618@imagine.PAWL.RPI.EDU> <419@augean.OZ> <392@ksr.UUCP> <7723@aw.sei.cmu.edu>
Reply-To: guy@auspex.UUCP (Guy Harris)
Organization: Auspex Systems, Santa Clara
Lines: 10

>As an aside, the instruction doesn't even work.  It implements an add,
>compare and branch at the bottom of the loop.  The only language that
>defines a FOR loop that is always executed at least once is Fortran,

It's interesting to note that Fortran 66 didn't, as I remember,
explicitly say that DO-loops were one-trip; they just all happened to be
implemented that way.  Fortran 77 explicitly said that they were
*zero*-trip; I seem to remember somebody from DEC arguing that they
should be one-trip, but fortunately the F77 committee didn't listen to
him....