[Bug tree-optimization/68552] [6 Regression]: ICE in in expand_expr_real_2 with -O2 -ftree-vectorize

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68552

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-11-26
                 CC|                            |jakub at gcc dot gnu.org
   Target Milestone|---                         |6.0
     Ever confirmed|0                           |1

--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
Caused by r230797:

2015-11-24  Jakub Jelinek  <jakub@redhat.com>

       PR target/68483
       * tree-vect-generic.c (lower_vec_perm): If VEC_PERM_EXPR
       is valid vec_shr pattern, don't lower it even if can_vec_perm_p
       returns false.
       * optabs.c (shift_amt_for_vec_perm_mask): Return NULL_RTX
       whenever first is nelt or above.  Don't mask expected with
       2 * nelt - 1.