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Date: Thu, 23 Nov 2000 20:57:31 +0100
From: Andi Kleen <ak@suse.de>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Andi Kleen <ak@suse.de>, Andries.Brouwer@cwi.nl, alan@lxorguk.ukuu.org.uk,
        linux-kernel@vger.kernel.org
Subject: Re: {PATCH} isofs stuff
Message-ID: <20001123205731.A26914@gruyere.muc.suse.de>
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In-Reply-To: <Pine.LNX.4.10.10011230825380.7992-100000@penguin.transmeta.com>; from torvalds@transmeta.com on Thu, Nov 23, 2000 at 08:59:46AM -0800
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On Thu, Nov 23, 2000 at 08:59:46AM -0800, Linus Torvalds wrote:
> [ Btw, I noticed that one of my machines _does_ have gcc-2.95.2, so I can
>   look at the isofs code generation myself.  I don't see anything obvious,
>   and the code is hairy. The differences between 2.91.66 and 2.95.2 are
>   big enough that a plain "diff" doesn't show anything clear. Andi, what
>   does your test-case look like? ]

Just a variable width shift of long long with both arguments fetched
from deep indirection via pointers, and that all in a function with
register pressure (extracted from the XFS source, which does all kinds
of nasty things with long long) 

I am actually not sure if the normal kernel contains even a variable
width long long shift.

-Andi (who also sees some strange hangs in 2.4.0test11-pre, but more
suspects his own hacks. no fs corruption, but I do not run dbench normally) 

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