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Message-ID: <452CBB57.4050107@innova-card.com>
Date:	Wed, 11 Oct 2006 11:37:27 +0200
Reply-To: Franck <vagabon.xyz@gmail.com>
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To:	Ralf Baechle <ralf@linux-mips.org>
CC:	Franck Bui-Huu <vagabon.xyz@gmail.com>,
	Atsushi Nemoto <anemo@mba.ocn.ne.jp>, ths@networkno.de,
	linux-mips@linux-mips.org
Subject: Re: [PATCH] setup.c: introduce __pa_symbol() and get ride of CPHYSADDR()
References: <452BA4E7.30901@innova-card.com> <20061010.231944.42203018.anemo@mba.ocn.ne.jp> <452BB5E1.5090308@innova-card.com> <20061011.002914.76462350.anemo@mba.ocn.ne.jp> <452BC4A5.3080706@innova-card.com> <20061010215124.GA21012@linux-mips.org>
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From:	Franck Bui-Huu <vagabon.xyz@gmail.com>
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Ralf Baechle wrote:
> On Tue, Oct 10, 2006 at 06:04:53PM +0200, Franck Bui-Huu wrote:
> 
>> ok, and does the trick on KSEG0/XKPHYS really worth ? I mean what is
>> the size code gain ?
> 
> Gcc / gas generate a 6 instruction sequence to load something from a
> 64-bit address, basically lui, add, dsll16, add, dsll16, add.  It's
> just 2 instructions for 32-bit addresses.  This boils down to space
> savings in the hundred of kilobytes for a kernel.
> 

ok, the hack seems to worth it...

		Franck