On September 14, 2016 11:36:16 PM GMT+02:00, Jan Hubicka <hubi...@ucw.cz> wrote:
>> + /* 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?
IRA bogously relies on BB_VISITED being cleared at pass start.
Richard.
>Honza
