[Bug rtl-optimization/55717] [4.8 Regression] ICE in form_sum, at reload.c:5400

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55717

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2012-12-17
         AssignedTo|unassigned at gcc dot       |jakub at gcc dot gnu.org
                   |gnu.org                     |
     Ever Confirmed|0                           |1

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-12-17 18:32:55 UTC ---
Created attachment 28987
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28987
gcc48-pr55717.patch

Untested fix.  Instead of returning very likely bogus value x this patch
returns NULL and let the callers deal with that as error (so they don't try
that simplification, instead try some other or just punt at simplifying).