Xref:	news2.mv.net comp.os.msdos.djgpp:6759
From:	alaric AT abwillms DOT demon DOT co DOT uk (Alaric B. Williams)
Newsgroups:	comp.os.msdos.djgpp
Subject:	GAS - register preservations and the like
Date:	Wed, 31 Jul 1996 19:14:00 GMT
Lines:	32
Message-ID:	<838840328.11194.6@abwillms.demon.co.uk>
NNTP-Posting-Host:	abwillms.demon.co.uk
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Hi there... I just had the most awful bughunt of my life; I noticed
I'd turned optimisation off in my makefile, and stuck it back at -O2,
and thought no more... until my code started to SIGSEGV horribly.

Eventually, I found out why.

I had a function that called an inline assembly function; it seemed
that, when optimised, this C++ function stored a pointer in ESI that
it expected preserved accross my inline function. Well, I only
preserve the segregs, ESP, EIP, and EBP... exactly which functions
/do/ need to be preserved? It's a time-critical function, so I want to
do the absolute minimum of pushing and popping.


While we're at it, I'd like to try and make gas a bit less dependent
on phases of the moon. Which source should I get - the one that should
be gettable from some DJGPP site somewhere, or the GNU .tar.gz version
- and if I produce patches to fix GAS, who should I tell?

Am I allowed to add snazzy features (should I think of any)?

Regards,


ABW
--
I have become... Comfortably numb...

Alaric B. Williams Internet : alaric AT abwillms DOT demon DOT co DOT uk
<A HREF="http://www.hardcafe.co.uk/Alaric/">http://www.hardcafe.co.uk/Alaric/</A>

- Raw text -