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Date: Thu, 05 Mar 2015 00:54:00 -0000
From: Jan Hubicka <hubicka@ucw.cz>
To: Richard Biener <richard.guenther@gmail.com>
Cc: Jeff Law <law@redhat.com>, Aldy Hernandez <aldyh@redhat.com>,	gcc-patches <gcc-patches@gcc.gnu.org>, Jan Hubicka <hubicka@ucw.cz>
Subject: Re: [patch/committed] PR middle-end/65233 make walk-ssa_copies handle empty PHIs
Message-ID: <20150305005444.GD86051@kam.mff.cuni.cz>
References: <54F3F648.8090400@redhat.com> <CAFiYyc3qQhXgkLB_zgO9fOmqQ0caSpxGTCr6ERy4VJvX4H9jkw@mail.gmail.com> <54F697A5.6090908@redhat.com> <CAFiYyc0FWK45geB3qKoj-RjQM3mPh3+d3o_Kuh+KZsBrzBUskQ@mail.gmail.com> <CAFiYyc0k5pkR8ju+VM1G6FNvg2xkjRwPEu6XtZuqy-uENc3GYQ@mail.gmail.com>
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> >
> > It gets passed the valueize callback now which returns NULL_TREE for
> > SSA names we can't follow.
> 
> Btw, for match-and-simplify I had to use that as default for fold_stmt
> _exactly_ because of the call to fold_stmt from replace_uses_by
> via merge-blocks from cfgcleanup.  This is because replace-uses-by
> doesn't have all uses replaced before it folds the stmt!
> 
> We also have the "weaker" in-place flag.
> 
> 2015-03-04  Richard Biener  <rguenther@suse.de>
> 
>         PR middle-end/65233
>         * ipa-polymorphic-call.c: Include tree-ssa-operands.h and
>         tree-into-ssa.h.
>         (walk_ssa_copies): Revert last chage.  Instead do not walk
>         SSA names registered for SSA update.

Maybe include the patch?  It should not be problem to make the function
to valuelize everything it looks into.

Honza