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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/50208] [4.7 Regression] ICE: in vinfo_for_stmt at tree-vectorizer.h:598 with -ftree-vectorize -fno-tree-fre -fno-tree-pre
Date: Mon, 29 Aug 2011 11:05:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50208

--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-08-29 10:44:42 UTC ---
The problem is that def_stmt is a gimple stmt from before the loop and
new_loop_vec_info only initializes gimple_uid of stmts in the loop being
processed.
So perhaps before testing for vinfo_for_stmt it should
  || !gimple_bb (def_stmt)
  || !flow_bb_inside_loop_p (loop, gimple_bb (def_stmt))
and perhaps give up in those cases too?  Loop would need to be initialized,
perhaps similarly to vect_recog_dot_prod_pattern?
  loop_vec_info loop_info = STMT_VINFO_LOOP_VINFO (vinfo_for_stmt (stmt));
  struct loop *loop = LOOP_VINFO_LOOP (loop_info);
?  I have no idea whether this can be invoked from slp vectorizer and what to
do in that case.