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Date: Mon, 4 Dec 2006 14:33:24 -0800
From: "Kip Macy" <kip.macy@gmail.com>
To: "Marius Strobl" <marius@alchemy.franken.de>
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Cc: cvs-src@freebsd.org, src-committers@freebsd.org,
	Kip Macy <kmacy@freebsd.org>, cvs-all@freebsd.org
Subject: Re: cvs commit: src/sys/conf kern.mk
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I haven't talked to Sam, I had forgotten about that - this will only break
ABI compat on -HEAD.  "-mcmodel=medlow" was almost certainly never needed,
its an optimization that reduces then number of instructions needed to load
a constant by assuming that the constant is <=32 bits. Loading a 32 bit
constant is 3 instructions,  loading a 64-bit constant is 7 :-(. Considering
the other performance issues that sparc64 has, its safe to say that the
extra overhead is in the noise.

                                                          -Kip


On 12/4/06, Marius Strobl <marius@alchemy.franken.de> wrote:
>
> On Sun, Nov 26, 2006 at 11:16:46PM +0000, Kip Macy wrote:
> > kmacy       2006-11-26 23:16:46 UTC
> >
> >   FreeBSD src repository
> >
> >   Modified files:
> >     sys/conf             kern.mk
> >   Log:
> >   Fix module loading for sparc on machines with greater than 1GB of RAM
> >
>
> Hi Kip,
>
> could you please update the comment above the line you changed
> as appropriate?
> Do you have an idea why medlow no longer is crucial in order
> to get a working kernel?
> Did you talk to sam@ regarding providing a new sparc64 HAL BLOB
> (according to sys/contrib/dev/ath/public/sparc64-be-elf.inc it
> was built with -mcmodel=medlow, too)?
>
> Marius
>
>