From: Thiemo Seufer <ths@networkno.de>
To: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: vagabon.xyz@gmail.com, ralf@linux-mips.org, linux-mips@linux-mips.org
Subject: Re: [PATCH] setup.c: introduce __pa_symbol() and get ride of CPHYSADDR()
Date: Mon, 9 Oct 2006 17:59:20 +0100 [thread overview]
Message-ID: <20061009165920.GC18308@networkno.de> (raw)
In-Reply-To: <20061010.005142.03977034.anemo@mba.ocn.ne.jp>
Atsushi Nemoto wrote:
> On Mon, 9 Oct 2006 15:58:17 +0100, Thiemo Seufer <ths@networkno.de> wrote:
> > > do you mean "it allows to use only 2 'lui' instructions to load
> > > a symbol address into a register" ?
> >
> > It allows a 2-instruction "lui ; addiu" sequence instead of a
> > 6-instruction "lui ; lui ; addiu ; addiu ; dsll32 ; addu" sequence.
>
> Just for clarification: IIRC this optimization needs somewhat
> up-to-date binutils/gcc and is not enabled on current lmo kernel,
> right?
For old toolchains there used to be a gruesome hack (which AFAIR broke
at some point), for modern toolchains there's -msym32.
Thiemo
next prev parent reply other threads:[~2006-10-09 16:59 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 [this message]
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
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