GNU bug report logs - #23640
25.1.50; Getting rid of compiler warnings

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Package: emacs;

Reported by: Ken Brown <kbrown <at> cornell.edu>

Date: Sat, 28 May 2016 18:41:02 UTC

Severity: normal

Found in version 25.1.50

Done: Ken Brown <kbrown <at> cornell.edu>

Bug is archived. No further changes may be made.

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Message #73 received at 23640 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: rms <at> gnu.org
Cc: 23640 <at> debbugs.gnu.org, andrewjmoreton <at> gmail.com
Subject: Re: bug#23640: 25.1.50; Getting rid of compiler warnings
Date: Wed, 8 Jun 2016 00:18:09 -0700

Richard Stallman wrote:
> I guess so -- but is it a noticeable slowdown?  A priori, I doubt it.

You're probably right. The major effect these days would be on cache pressure, 
which is tricky to measure.

> If it is not significant, why worry about it?
> Better to write the code in the clean way.

For me it's cleaner to think of UNINIT as an attribute for a declaration, 
instead of thinking of UNUSED as a special expression that neither transfers 
control nor has a side effect nor yields a value. It's merely a plus that UNINIT 
generates code that is a tiny bit smaller and faster.
This bug report was last modified 8 years and 349 days ago.

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