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Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!elroy.jpl.nasa.gov!decwrl!usenet.coe.montana.edu!bsd.coe.montana.edu!nate From: nate@bsd.coe.montana.edu (Nate Williams) Newsgroups: comp.os.386bsd.questions Subject: Re: FPU in FreeBSD? Date: 10 Nov 1993 00:59:10 GMT Organization: Montana State University, Bozeman MT Lines: 24 Message-ID: <2bpecu$mkf@pdq.coe.montana.edu> References: <2bo8s7$c0r@nic.lth.se> NNTP-Posting-Host: bsd.coe.montana.edu In article <2bo8s7$c0r@nic.lth.se>, Joergen Haegg <jh@efd.lth.se> wrote: >I noticed that some files in gcc was compiled with -NOFPU. >Does this mean that I don't use the FPU in my 486 DX2? This means that the current FPU emulator in *BSD is not up to snuff. In order to get certain programs to work with FPU/NoFPU machines, we had to disable certain FPU features in gcc which caused problems with the current math-emulator. (I think they were fsin and fcos) >What should I do to get maximum floating-point performance in FreeBSD >and my own programs? >Is it enough to add '-m486'? That'll go a long way, but -m486 doesn't do any FP optimizations that I'm aware of, just alignment optimizations in structures and data which allow the 486 to read the stuff faster. Nate -- nate@bsd.coe.montana.edu | Freely available *nix clones benefit everyone, nate@cs.montana.edu | so let's not compete with each other, let's work #: (406) 994-4836 | compete with folks who try to tie us down to home #: (406) 586-0579 | proprietary O.S.'s (Microsloth) - Me