From: Russell Wallace <manorsof AT iol DOT ie>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Performance of -lemu
Date: Sun, 21 Jun 1998 15:03:35 +0100
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Eli Zaretskii wrote:
> 
> On Fri, 19 Jun 1998, Russell Wallace wrote:
> 
> > -O3           21 megaflops
> > -O3 -lemu     13 megaflops
> >
> > My understanding had been that -lemu should make no difference at all if
> > the program does in fact end up running on a machine with FP
> > hardware.
> 
> This is how it should work, yes.
> 
> > Can anyone explain the reason for this discrepancy, and whether there's
> > anything that can be done about it?
> 
> Did you try setting 387=y in the environment?  If you did, you will
> need to see how exactly does the emulator affect your program.  AFAIK,
> it shouldn't.

I tried that; no difference.

> In general, these issues are somewhat less debugged, since almost
> everybody has FP hardware these days.

Yeah.

> > (Short of forgetting about working
> > as-is and requiring users of 386s to run one of the .exe emulators,
> > which is what I'm planning to do as things currently stand.)
> 
> Why do you need to ``require'' your users?  The DJGPP startup code
> will automatically load the emulator, it just needs to be in the same
> directory as the binary.

Ah!  I missed that; I thought the emulator had to be run prior to
running the program.  That's straightforward enough, so I'll go with
that option then.  Thanks.















-- 
"To summarize the summary of the summary: people are a problem."
Russell Wallace
manorsof AT iol DOT ie