From: Jan Hubicka <jh@suse.cz>
To: Paolo Carlini <pcarlini@unitus.it>
Cc: Jan Hubicka <jh@suse.cz>, gcc@gcc.gnu.org, rth@cygnus.com
Subject: Re: 3.0 vs 3.0.1 on oopack's Max
Date: Mon, 10 Sep 2001 09:37:00 -0000 [thread overview]
Message-ID: <20010910183732.A16906@atrey.karlin.mff.cuni.cz> (raw)
In-Reply-To: <3B9CEA46.48C7CEC@unitus.it>
> Thanks for the analysis!
> (At this point all of this is still quite obscure to me, unfortunately... but
> for me it is a good occasion to learn more!)
:)
>
> By the way, I found only one change to setcc (ix86_expand_setcc) involving the
> branch, that is:
>
> http://gcc.gnu.org/ml/gcc-patches/2001-07/msg01627.html
Thats the change.
I will try to come with something to solve it tomorrow, but still I am not
quite sure how to do it.
One way I see is to fold both operations (setcc and movzx) into one instruction
before reload, but this is just papering around one particular special case.
Honza
>
> Which was a follow up to:
>
> http://gcc.gnu.org/ml/gcc-patches/2001-07/msg01552.html
>
> > I am not quite sure how to avoid gcc from doing this optimization.
> > I will take a look overnight.
>
> Thanks!
> Paolo.
>
prev parent reply other threads:[~2001-09-10 9:37 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-09-07 6:43 Paolo Carlini
2001-09-07 10:14 ` Tim Prince
2001-09-07 16:53 ` Richard Henderson
2001-09-08 2:15 ` Paolo Carlini
2001-09-08 9:03 ` Jan Hubicka
2001-09-10 9:33 ` Paolo Carlini
2001-09-10 9:37 ` Jan Hubicka [this message]
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