From: "Charles Sandmann" Newsgroups: comp.os.msdos.djgpp Subject: Re: help! FPU emulation worries... (RHIDE?) Date: Thu, 15 May 1997 22:32:17 Organization: Aspen Technology, Inc. Lines: 24 Message-ID: <337b8ef1.sandmann@clio.rice.edu> References: <337AD12B DOT 65DB AT Mathematik DOT tu-chemnitz DOT de> Reply-To: sandmann AT clio DOT rice DOT edu NNTP-Posting-Host: spica.dmccorp.com To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp Precedence: bulk > Or is there any way for me to simulate the software FPU even when > I have a 486 DX? SET 387=n > And to your problem with the exception. As far as I understand > the software FP software, it works by generating an exception > for any floating point code. Since it is under DJGPP not possible > (I don't know if this will fixed in the future) to debug programs > which use exceptions, you have really a problem when you try to debug > a program which uses the software FP code. It's even worse than that - the FPU emulator doesn't understand "far" so can't live in a separate CS/DS/SS very well, and it doesn't emulate debug flags at all. WMEMU fixes some, but not all, of these problems. > And at last: If there is someone who can tell me, how I can > simulate this situation on a processor, which has the FP unit > on it, I would do my best to fix that problem. It's a very complex problem which needs a lot of hacking. While it's not a nice thing to do - DJGPP does not support DEVELOPMENT of FPU code on a non-FPU box. It is run-time FPU emulation only. Sorry. With FPUs being essentially free, its impossible to justify spending any time on this.