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bug#23640: 25.1.50; Getting rid of compiler warnings

From: Paul Eggert
Subject: bug#23640: 25.1.50; Getting rid of compiler warnings
Date: Wed, 8 Jun 2016 00:18:09 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0

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.

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