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Date:	Fri, 18 May 2007 23:50:33 -0400
From:	Jeff Garzik <>
To:	Nick Piggin <>
CC:	Andrew Morton <>,
	Phillip Susi <>,
	Alex Volkov <>,
	'Linux Kernel Mailing List' <>
Subject: Re: aio is unlikely

Nick Piggin wrote:
> Aside from using branch constructs or hints that help the predictor
> guess the right way... I think gcc will move unlikely paths right past
> the end of the "likely" fastpath, so it can increase code size and be
> somewhat suboptimal in terms of icache usage.

Thanks for the reminder.  GCC definitely does code movement.

ISTR the code movement might even be "extreme", once the unit-at-a-time 
support arrived, placing "cold" code at the end of the compiled module.


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