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Re: recent binutils and mips64-linux

To: Eric Christopher <echristo@redhat.com>
Subject: Re: recent binutils and mips64-linux
From: "Zack Weinberg" <zack@codesourcery.com>
Date: Tue, 23 Sep 2003 12:45:36 -0700
Cc: Thiemo Seufer <ica2_ts@csv.ica.uni-stuttgart.de>, Alexandre Oliva <aoliva@redhat.com>, "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>, Atsushi Nemoto <nemoto@toshiba-tops.co.jp>, linux-mips@linux-mips.org, binutils@sources.redhat.com
In-reply-to: <20030923181659.GA30037@nevyn.them.org> (Daniel Jacobowitz's message of "Tue, 23 Sep 2003 14:16:59 -0400")
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <Pine.GSO.3.96.1030919144141.9134C-100000@delta.ds2.pg.gda.pl> <1063988420.2537.5.camel@ghostwheel.sfbay.redhat.com> <20030919164119.GH13578@rembrandt.csv.ica.uni-stuttgart.de> <ord6ds346n.fsf@free.redhat.lsd.ic.unicamp.br> <20030922233952.GR13578@rembrandt.csv.ica.uni-stuttgart.de> <1064280106.21720.0.camel@ghostwheel.sfbay.redhat.com> <20030923081447.GS13578@rembrandt.csv.ica.uni-stuttgart.de> <1064340070.21720.14.camel@ghostwheel.sfbay.redhat.com> <20030923181659.GA30037@nevyn.them.org>
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Daniel Jacobowitz <dan@debian.org> writes:

> On Tue, Sep 23, 2003 at 11:01:11AM -0700, Eric Christopher wrote:
>> 
>> I'm still trying to figure out why you are going through such weird
>> contortions at all. I understand not having an elf64 loader. That's what
>> the objcopy comment was for, everything else I don't understand. Why not
>> compile for the abi you want?
>
> Compare the optimal way to load an address into a register when you
> have a full 64-bit address space and when you know that addresses are
> sign extended.  I'm told it saves over 100K of code.

Maybe what you really want is an -mdata-model=kernel switch (or some
such spelling) that tells gcc to do the right thing in the first
place?

zw

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