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Re: [PATCH]: Clear SSA_NAME_DEF_STMT on released SSA names

From: "Daniel Berlin" <dberlin at dberlin dot org>
To: law at redhat dot com
Cc: gcc-patches <gcc-patches at gcc dot gnu dot org>, "Diego Novillo" <dnovillo at redhat dot com>
Date: Fri, 29 Sep 2006 22:48:14 -0400
Subject: Re: [PATCH]: Clear SSA_NAME_DEF_STMT on released SSA names
References: <4aca3dc20609291924s5856be18pda97fbe2f7ebe129@mail.gmail.com> <1159584246.2746.18.camel@fuel98.slc.redhat.com> <4aca3dc20609291945x631bd646j8d1aca5c9f957d3d@mail.gmail.com>

On 9/29/06, Daniel Berlin <dberlin@dberlin.org> wrote:

> Bad idea unless something has changed.
>
> SSA_NAME_DEF_STMT uses the tree chain field.  WHen we release an
> SSA_NAME we use the chain field to link together all the free SSA_NAME
> nodes.

Interesting. It survived bootstrap and regtesting here.
It must be reset later on again to chain them together.

Ah, so it is, about 30 lines down.

Except we reference it as just TREE_CHAIN.
Forget it then, i'll wait till we have SSA_NAME's where we aren't
sharing things like this.

References:
- [PATCH]: Clear SSA_NAME_DEF_STMT on released SSA names
  - From: Daniel Berlin
- Re: [PATCH]: Clear SSA_NAME_DEF_STMT on released SSA names
  - From: Jeffrey Law
- Re: [PATCH]: Clear SSA_NAME_DEF_STMT on released SSA names
  - From: Daniel Berlin

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