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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/61634] [4.8/4.9/4.10 Regression] ICE in in vect_get_vec_def_for_operand, at tree-vect-stmts.c:1423
Date: Tue, 08 Jul 2014 11:29:00 -0000	[thread overview]
Message-ID: <bug-61634-4-LXV9LFaDk3@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-61634-4@http.gcc.gnu.org/bugzilla/>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61634

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
We have

patt_24 = DOT_PROD_EXPR <_12, _12, prephitmp_48>;

and

_12 = _11 >> 2;

is not STMT_VINFO_IN_PATTERN_P but it doesn't have a vec_stmt yet even
though it is there:

  vect__12.29_90 = vect__11.27_87 >> 2;
  vect__12.29_91 = vect__11.28_89 >> 2;
  _12 = _11 >> 2;

that's because vectorizable_shift doesn't assign to *vec_stmt!?

      if (slp_node)
        continue;

      if (j == 0)
        STMT_VINFO_VEC_STMT (stmt_info) = *vec_stmt = new_stmt;
      else
        STMT_VINFO_RELATED_STMT (prev_stmt_info) = new_stmt;

if it's part of an SLP node... (pure_slp).

I'm not sure we can vectorize this case.


  parent reply	other threads:[~2014-07-08 11:29 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-27 17:36 [Bug c/61634] New: [4.8.3/4.9.1] " manuel.lauss at googlemail dot com
2014-06-28  7:36 ` [Bug tree-optimization/61634] [4.8/4.9/4.10 Regression] " trippels at gcc dot gnu.org
2014-06-30 13:27 ` jakub at gcc dot gnu.org
2014-07-07 11:08 ` rguenth at gcc dot gnu.org
2014-07-08 11:29 ` rguenth at gcc dot gnu.org [this message]
2014-11-25 16:35 ` [Bug tree-optimization/61634] [4.8/4.9/5 " rguenth at gcc dot gnu.org
2014-11-27  9:34 ` rguenth at gcc dot gnu.org
2014-11-27  9:37 ` [Bug tree-optimization/61634] [4.8/4.9 " rguenth at gcc dot gnu.org
2014-12-10 13:01 ` rguenth at gcc dot gnu.org
2014-12-19 13:44 ` jakub at gcc dot gnu.org
2015-02-23 12:38 ` rguenth at gcc dot gnu.org
2015-02-26 14:18 ` [Bug tree-optimization/61634] [4.8 " rguenth at gcc dot gnu.org
2015-02-26 14:39 ` rguenth at gcc dot gnu.org

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