linux-kernel - Re: [RFC] arm: use built-in byte swap function

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Message-ID: <1360141322.6066.4.camel@shinybook.infradead.org>
Date:	Wed, 6 Feb 2013 09:02:04 +0000
From:	"Woodhouse, David" <david.woodhouse@...el.com>
To:	Kim Phillips <kim.phillips@...escale.com>
CC:	Russell King - ARM Linux <linux@....linux.org.uk>,
	Borislav Petkov <bp@...en8.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Santos <daniel.santos@...ox.com>,
	David Rientjes <rientjes@...gle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robherring2@...il.com>
Subject: Re: [RFC] arm: use built-in byte swap function

On Tue, 2013-02-05 at 21:04 -0600, Kim Phillips wrote:
> gcc -Os emits calls to __bswapsi2 on those platforms to save space
> because they don't have the single rev byte swap instruction.

Is that the right thing for GCC to do in that situation?

If so, perhaps we should be *providing* __bswap[sd]i2 functions for it
to use?

If not, perhaps there should be a PR filed?

Or is our use case justifiably different to the general case of '-Os'?
If so, why?

-- 
                   Sent with MeeGo's ActiveSync support.

David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation




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