Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!ucbvax!LERC08.LERC.NASA.GOV!fsfacca From: fsfacca@LERC08.LERC.NASA.GOV (Tony Facca) Newsgroups: comp.sys.sgi Subject: Re: Floating point problems Message-ID: <8908111333.AA03060@lerc08.lerc.nasa.gov> Date: 11 Aug 89 13:33:41 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 35 [Becky Marvil] writes: > I've been having floating point problems on an Iris 2400 turbo > running version GL2-W3.5, and was wondering if anyone can help. [ stuff about floating point problems deleted ] > If anyone has a clue as to what my problem is, I would appreciate > a response. One possibility, I suppose, is that the fpa board > is screwed up. If so, is there a way to bypass this board and > have the software do floating point operations? We've had similar problems in the past on our 3030's and in every instance it turned out to be the fpa board. A quick check that we use is a simple program which loops from 0 to 100 and prints out the integer and floating point value at each interation. Its written on FORTRAN so we compile it first with, then without the floating point option: [with] f77 -Zg prog.f -o prog [w/o] f77 prog.f -o prog I wish I had a bad fpa board to test this on :) but I think that's how we found the problem. I'll send the source directly rather than posting it here.. Hope this helps.. -- ----------------------------------------------------------------------------- Tony Facca | phone: 216-433-8318 NASA Lewis Research Center | Cleveland, Ohio 44135 | email: fsfacca@lerc08.lerc.nasa.gov -----------------------------------------------------------------------------