Subject: Re: Using %cr2 to reference "current"
To: dalecki@evision-ventures.com (Martin Dalecki)
Date: Wed, 7 Nov 2001 13:38:34 +0000 (GMT)
Cc: alan@lxorguk.ukuu.org.uk (Alan Cox),
        torvalds@transmeta.com (Linus Torvalds), linux-kernel@vger.kernel.org
In-Reply-To: <3BE93E77.6E4E3C95@evision-ventures.com> from "Martin Dalecki" at Nov 07, 2001 03:00:23 PM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Sender: linux-kernel-owner@vger.kernel.org

> With the following options enabled we get:
> -freg-struct-return -mrtd -mregparm=3
> 
>    text    data     bss     dec     hex filename
> 1302372  260804  288080 1851256  1c3f78 vmlinux
> 
> Quite significant difference if you ask me!!!

30K is nice have but still a scratch on the surface compared with 500K 8)

> in a saving of about 2.3% in code size. This may not sound grat in
> relative
> numbers, but for a compiler designer this would already sound hilarious
> and in
> absolute numbers it's: 29760 bytes. Not withstanding the speed
> improvement...

The obvious question is - have you tried running the kernel built like that
with any asm fixups needed ?
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