[Bug tree-optimization/17517] [4.0 Regression] ICE: SSA corruption

Thu Sep 16 13:12:00 GMT 2004

------- Additional Comments From amacleod at redhat dot com  2004-09-16 13:12 -------
a followon issue with copyrename.

if we have an abnormal PHI:
  a_6 = <a_4, a_3>

and somewhere else we have 
  p_9 = a_2
<...>
  a_3 = a_2

we coalesce p_9 and a_2 because there is no reason not to.
a_3 and a_2 are automatically coalesced since they hgave the same root.

now we have p_9 propgated into the abnormal PHI, and boom.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
     Ever Confirmed|                            |1
   Last reconfirmed|0000-00-00 00:00:00         |2004-09-16 13:12:10
               date|                            |

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17517