Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!primerd!hobbiton!fieland
From: fieland@hobbiton.prime.com
Newsgroups: comp.lang.fortran
Subject: Re: Sun FPU question
Message-ID: <26400002@hobbiton>
Date: 6 Mar 89 21:25:00 GMT
References: <331@kvasir.esosun.UUCP>
Lines: 16
Nf-ID: #R:kvasir.esosun.UUCP:-33100:hobbiton:26400002:000:445
Nf-From: hobbiton.prime.com!fieland    Mar  6 16:25:00 1989


You might be interested in a few facts about the Mips fortran
compiler.  Sometimes constant folding in the front end of the
Mips fortran compiler results in Inf or NaN being assign to the
variable  at compile time, as in

    r = 0.0/0.0
 or
    r = 1.0 / 0.0

Unfortunately, even compiling with optimization level zero (no optimization)
doesn't turn this off.  However,

    r1 = 0
    r = 0 / r1
does seem to be calculated at execution time.