From: Franck Bui-Huu <vagabon.xyz@gmail.com>
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()
Date: Wed, 11 Oct 2006 11:37:27 +0200 [thread overview]
Message-ID: <452CBB57.4050107@innova-card.com> (raw)
In-Reply-To: <20061010215124.GA21012@linux-mips.org>
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
prev parent reply other threads:[~2006-10-11 9:37 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-06 13:36 [PATCH] setup.c: introduce __pa_symbol() and get ride of CPHYSADDR() Franck Bui-Huu
2006-10-06 17:21 ` Thiemo Seufer
2006-10-09 11:58 ` Franck Bui-Huu
2006-10-09 13:21 ` Thiemo Seufer
2006-10-09 14:25 ` Franck Bui-Huu
2006-10-09 14:58 ` Thiemo Seufer
2006-10-09 15:30 ` Franck Bui-Huu
2006-10-09 15:51 ` Atsushi Nemoto
2006-10-09 16:59 ` Thiemo Seufer
2006-10-10 8:49 ` Atsushi Nemoto
2006-10-10 13:49 ` Franck Bui-Huu
2006-10-10 14:19 ` Atsushi Nemoto
2006-10-10 15:01 ` Franck Bui-Huu
2006-10-10 15:29 ` Atsushi Nemoto
2006-10-10 16:04 ` Franck Bui-Huu
2006-10-10 16:16 ` Franck Bui-Huu
2006-10-10 21:51 ` Ralf Baechle
2006-10-11 3:11 ` Atsushi Nemoto
2006-10-11 9:37 ` Franck Bui-Huu [this message]
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