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[Bug tree-optimization/38401] TreeSSA-PRE load after store misoptimization
- From: "dberlin at dberlin dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 Dec 2008 17:35:46 -0000
- Subject: [Bug tree-optimization/38401] TreeSSA-PRE load after store misoptimization
- References: <bug-38401-16914@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #6 from dberlin at gcc dot gnu dot org 2008-12-04 17:35 -------
Subject: Re: TreeSSA-PRE load after store misoptimization
Yes, i'm aware, but again, that is because my recollection is doing
partial antic partial avail with lifetime optimality requires code
placement that we don't do.
On Thu, Dec 4, 2008 at 12:27 PM, steven at gcc dot gnu dot org
<gcc-bugzilla@gcc.gnu.org> wrote:
>
>
> ------- Comment #5 from steven at gcc dot gnu dot org 2008-12-04 17:27 -------
> by_all was there because you made it so on purpose. From tree-ssa-pre.c:
>
> " For the partial anticipation case, we only perform insertion if it
> is partially anticipated in some block, and fully available in all
> of the predecessors.
> "
>
>
> --
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38401
>
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38401