[Bug middle-end/20623] ICE: fold check: original tree changed by fold with --enable-checking=fold

["rguenther at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #28 from rguenther at suse dot de  2007-06-21 19:33 -------
Subject: Re:  ICE: fold check: original tree changed
 by fold with --enable-checking=fold

On Thu, 21 Jun 2007, spop at gcc dot gnu dot org wrote:

> ------- Comment #26 from spop at gcc dot gnu dot org  2007-06-21 18:21 -------
> Subject: Re:  ICE: fold check: original tree changed by fold with
> --enable-checking=fold
> 
> Just to sum it up, and for asking for advice,
> attached is the patch that I'm bootstrapping and testing now.
> 
> > Another thing would be to note where we call this helper from fold() routines
> > and not set the flag only for those callers which should be safe.  We'd need
> > another flag argument to the function or another wrapper.
> >
> 
> In another version of this patch, I replaced all the callers from the
> folder, to use a gcc_assert (TREE_ADDRESSABLE (base) == 1), and this
> failed because some calls from the C front-end used that function and
> did not have set their addressable flag (yet?).  This resulted in all
> the fails left in the second part of the bug.
> 
> With the attached patch, fold functions do not set that flag, and this
> solves the remaining fails.  I'm bootstrapping and testing all
> languages again with fold checking.

This looks good (again ;)).

Thanks,
Richard.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20623