[Bug middle-end/47019] [4.6 Regression] ICE: in rename_uses, at sese.c:535 with -O -ftree-pre -fgraphite-identity -fno-tree-copy-prop

[spop at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47019

Sebastian Pop <spop at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2010.12.22 16:55:09
         AssignedTo|unassigned at gcc dot       |spop at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1

--- Comment #1 from Sebastian Pop <spop at gcc dot gnu.org> 2010-12-22 16:55:09 UTC ---
This is due to the fact that the SSA representation is not in
loop-closed form: we are defining and using an SSA_NAME
in two different loops without a loop-close-phi node in between:

loop_1
  pretmp.15_60 = offset.3_18 + pretmp.15_59;
end_1

loop_2
  D.1564_26 = pretmp.15_60;
end_2