From: Zack Weinberg <zack@codesourcery.com>
To: Richard Henderson <rth@redhat.com>,
Zack Weinberg <zack@codesourcery.com>,
gcc-patches@gcc.gnu.org
Subject: Re: patch/RFC: PR optimization/8423
Date: Wed, 06 Nov 2002 15:01:00 -0000 [thread overview]
Message-ID: <20021106230116.GA16220@egil.codesourcery.com> (raw)
In-Reply-To: <20021106223345.GI22215@redhat.com>
On Wed, Nov 06, 2002 at 02:33:45PM -0800, Richard Henderson wrote:
> On Wed, Nov 06, 2002 at 11:36:44AM -0800, Zack Weinberg wrote:
> > What actually happens is it blows up compiling libgcc, due to some
> > construct or other that simplify-rtx.c doesn't know how to handle but
> > cse's simplifiers do. I haven't yet dug into this.
>
> I should have remembered this. cse1 is needed so that we
> propagate addressof into memories. Addressof elimination
> needs to happen before gcse because gcse can't handle
> aliasing memory and registers.
>
> So we can neither get rid of cse1 nor move gcse before it.
This is unfortunate. How hard would it be to teach gcse about aliasing
memory and registers? I really like the idea of getting rid of a CSE pass.
zw
next prev parent reply other threads:[~2002-11-06 23:01 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-05 13:55 Zack Weinberg
2002-11-06 11:23 ` Richard Henderson
2002-11-06 11:33 ` Diego Novillo
2002-11-06 14:34 ` Richard Henderson
2002-11-06 11:36 ` Zack Weinberg
2002-11-06 14:33 ` Richard Henderson
2002-11-06 15:01 ` Zack Weinberg [this message]
2002-11-06 15:07 ` Richard Henderson
2002-11-07 3:06 ` Michael Matz
2002-11-05 16:17 Roger Sayle
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