[Bug tree-optimization/55684] [4.8 Regression] ICE in remove_redundant_iv_tests, at tree-ssa-loop-ivcanon.c:559

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55684

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |hubicka at gcc dot gnu.org
         AssignedTo|unassigned at gcc dot       |rguenth at gcc dot gnu.org
                   |gnu.org                     |

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> 2012-12-14 11:50:23 UTC ---
ICEing here is of course pointless.  Looks like a debugging leftover to me.

First when in estimate_numbers_of_iterations_loop, number_of_iterations_exit
succeeds, then in find_loop_niter called from
canonicalize_loop_induction_variables it fails, so does it when called
from remove_redundant_iv_tests for that loop.

So it's quite by design that this can happen.  Testing the obvious patch.