linux-kernel - Re: [PATCH 1/24] make atomic_read() behave consistently on alpha

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Message-ID: <20070811000029.GA12779@gondor.apana.org.au>
Date:	Sat, 11 Aug 2007 08:00:29 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Segher Boessenkool <segher@...nel.crashing.org>
Cc:	paulmck@...ux.vnet.ibm.com, heiko.carstens@...ibm.com,
	horms@...ge.net.au, linux-kernel@...r.kernel.org,
	csnook@...hat.com, rpjday@...dspring.com, netdev@...r.kernel.org,
	ak@...e.de, cfriesen@...tel.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, jesper.juhl@...il.com,
	linux-arch@...r.kernel.org, zlynx@....org, schwidefsky@...ibm.com,
	davem@...emloft.net, wensong@...ux-vs.org, wjiang@...ilience.com
Subject: Re: [PATCH 1/24] make atomic_read() behave consistently on alpha

On Fri, Aug 10, 2007 at 10:07:27PM +0200, Segher Boessenkool wrote:
> 
> That means GCC cannot compile Linux; it already optimises
> some accesses to scalars to smaller accesses when it knows
> it is allowed to.  Not often though, since it hardly ever
> helps in the cost model it employs.

Please give an example code snippet + gcc version + arch
to back this up.

Thanks,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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