linux-kernel - Re: Using unsigned int for loop counters - better performance for Architectures

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Message-ID: <4C53EF30.5020303@davidnewall.com>
Date:	Sat, 31 Jul 2010 19:08:56 +0930
From:	David Newall <davidn@...idnewall.com>
To:	"Luis R. Rodriguez" <mcgrof@...il.com>
CC:	linux-kernel@...r.kernel.org,
	"doug.dahlby" <Doug.Dahlby@...eros.com>,
	Jiri Slaby <jirislaby@...il.com>
Subject: Re: Using unsigned int for loop counters - better performance for
 	Architectures - urban hacker legend?

I don't know about unsigned int; but looping down to zero should be 
faster on many architectures, as they automatically test for zero (or 
negative) on decrement.  Counting up requires an additional test.
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