[Bug tree-optimization/88283] ICE in try_improve_iv_set, at tree-ssa-loop-ivopts.c:6677

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88283

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-12-03
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
#1  0x000000000121f580 in try_improve_iv_set (data=0x7fffffffd820, 
    ivs=0x28a23d0, try_replace_p=0x7fffffffd6f7)
    at /tmp/trunk/gcc/tree-ssa-loop-ivopts.c:6677
6677      gcc_assert (best_cost == iv_ca_cost (ivs));
(gdb) p best_cost
$1 = {cost = 12, complexity = 0, scratch = 0}
(gdb) p iv_ca_cost (ivs)
$2 = {cost = 10000000, complexity = 10000000, scratch = 10000000}


Thus confirmed.  Only graphite related as to the input IL to the IVOPTs pass.
I suspect we run into some --param and do not expect backing out with
maxmimum cost here.