Xref: news2.mv.net comp.os.msdos.djgpp:6052
From: Charles Sandmann <sandmann AT clio DOT rice DOT edu>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: 387 emulation slowed down *a lot*
Date: Tue, 16 Jul 1996 08:36:19 CDT
Organization: Rice University, Houston, Texas
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Message-ID: <31eb9ad3.sandmann@clio.rice.edu>
References: <4sdt9p$djj AT news2 DOT delphi DOT com>
Reply-To: sandmann AT clio DOT rice DOT edu
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To: djgpp AT delorie DOT com
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> Has there been a major change in the way floating point instructions
> are intercepted in this version? Anything I can do?

Essentially a complete re-write.  FPU emulation didn't work with V1.x 
under DPMI.  When I did FPU emulation in V2, my goal was to make it
work with a minimum of code and effort.  So I used the signal library,
which took about 3 lines of code.  This isn't the fastest way, which
would require some assembly glue to hook in, etc.  Since FPUs are 
essentially free now, I couldn't justify spending an extra 10 minutes
on it.  If you want to hack on NPXSETUP, you can probably make it 
faster.  But it's probably easier to find a 387 or 486DX ...