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Date: Wed, 14 Sep 2016 21:47:00 -0000
From: Jan Hubicka <hubicka@ucw.cz>
To: Richard Biener <richard.guenther@gmail.com>
Cc: Kugan Vivekanandarajah <kugan.vivekanandarajah@linaro.org>,	Andrew Pinski <pinskia@gmail.com>,	"gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>,	Jan Hubicka <hubicka@ucw.cz>, Martin Jambor <mjambor@suse.cz>
Subject: Re: [RFC][IPA-VRP] Early VRP Implementation
Message-ID: <20160914213616.GA88954@kam.mff.cuni.cz>
References: <19ff8188-aed7-0f9e-cc0b-0603698787ff@linaro.org> <CAFiYyc0b3J7a6kB0VoLWGG9_qJ6eK2NuGshQfDpewsipkUh_7g@mail.gmail.com> <ac8721e4-ed98-b745-452d-e67c3f752d4c@linaro.org> <CAFiYyc1z+3Bwqd7yTgt8NVT=J+pF5aoemxvVbVShWm-O-4moCw@mail.gmail.com> <48e42d0c-057c-312a-4e41-cd78c8b38b5e@linaro.org> <CAFiYyc2pd6CQrE1NWZ7YAp1F_+nvn9tHwa1BYYa0jZm=cbxJnw@mail.gmail.com> <e1e07983-8468-5eec-eeb6-7c6bb1a2d228@linaro.org> <CAFiYyc3a1r_q9tVa=o8SKcBHOEv14mqDSrEKKuH3Pi7HF3kc6w@mail.gmail.com> <CAELXzTNiYLRn0T70mi6K27H7Tt9AQNYyYamJ99di3vWtivLGbw@mail.gmail.com> <CAFiYyc19GuN0tuEtyfSX-pj6S8--uvS0zUsip1N7uKY=5-ON=g@mail.gmail.com>
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> +  /* Visit PHI stmts and discover any new VRs possible.  */
> +  gimple_stmt_iterator gsi;
> +  for (gphi_iterator gpi = gsi_start_phis (bb);
> +       !gsi_end_p (gpi); gsi_next (&gpi))
> +    {
> +      gphi *phi = gpi.phi ();
> +      tree lhs = PHI_RESULT (phi);
> +      value_range vr_result = VR_INITIALIZER;
> +      if (! has_unvisived_preds
>            && stmt_interesting_for_vrp (phi)
> +         && stmt_visit_phi_node_in_dom_p (phi))
> +       extract_range_from_phi_node (phi, &vr_result, true);
> +      else
> +       set_value_range_to_varying (&vr_result);
> +      update_value_range (lhs, &vr_result);
> +    }
> 
> due to a bug in IRA you need to make sure to un-set BB_VISITED after
> early-vrp is finished again.
How IRA bugs affects early passes?

Honza