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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: 23.0.50 compile problem on Windows XP
Date: Fri, 05 Oct 2007 10:30:47 +0200
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Cc: sridhar_ml@yahoo.com, emacs-devel@gnu.org
To: Jason Rumney <jasonr@gnu.org>
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> Date: Fri, 05 Oct 2007 09:11:03 +0100
> From: Jason Rumney <jasonr@gnu.org>
> Cc: sridhar_ml@yahoo.com, emacs-devel@gnu.org
> 
> In the general case, the abs macro is dangerous, as it evaluates its
> argument twice. Is it really an important optimization to use a
> macro for this?

I don't know if it's an important optimization; probably not, although
it seems to be used in the display code, where speed is important.  We
could replace it by an inline function, though.