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From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/30252] [4.2 regression] miscompilation of sigc++-2.0 based code with -fstrict-aliasing Date: Mon, 04 Jun 2007 15:28:00 -0000 [thread overview] Message-ID: <20070604152812.31487.qmail@sourceware.org> (raw) In-Reply-To: <bug-30252-7958@http.gcc.gnu.org/bugzilla/> ------- Comment #28 from rguenth at gcc dot gnu dot org 2007-06-04 15:28 ------- solution_set_add () looks like the culprit (thx micha). So, the following will fix it in case we have offsets only from COMPONENT_REFs, not from regular pointer arithmetic (which is not true): Index: tree-ssa-structalias.c =================================================================== --- tree-ssa-structalias.c (revision 125310) +++ tree-ssa-structalias.c (working copy) @@ -715,13 +715,10 @@ solution_set_add (bitmap set, unsigned H less than end. Otherwise, it is globbed to a single variable. */ - if ((get_varinfo (i)->offset + offset) < get_varinfo (i)->fullsize) + if (get_varinfo (i)->offset + get_varinfo (i)->size - 1 >= offset + && get_varinfo (i)->offset + offset < get_varinfo (i)->fullsize) { - unsigned HOST_WIDE_INT fieldoffset = get_varinfo (i)->offset + offset; - varinfo_t v = first_vi_for_offset (get_varinfo (i), fieldoffset); - if (!v) - continue; - bitmap_set_bit (result, v->id); + bitmap_set_bit (result, i); } else if (get_varinfo (i)->is_artificial_var || get_varinfo (i)->has_union -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30252
next prev parent reply other threads:[~2007-06-04 15:28 UTC|newest] Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top 2006-12-18 15:56 [Bug tree-optimization/30252] New: [4.2/4.3 " belyshev at depni dot sinp dot msu dot ru 2006-12-18 15:57 ` [Bug tree-optimization/30252] " belyshev at depni dot sinp dot msu dot ru 2006-12-18 18:24 ` pinskia at gcc dot gnu dot org 2006-12-18 19:04 ` pinskia at gcc dot gnu dot org 2006-12-19 11:11 ` [Bug tree-optimization/30252] [4.2 " belyshev at depni dot sinp dot msu dot ru 2006-12-27 16:18 ` rguenth at gcc dot gnu dot org 2006-12-27 20:19 ` belyshev at depni dot sinp dot msu dot ru 2007-02-19 20:52 ` mmitchel at gcc dot gnu dot org 2007-04-29 7:02 ` pinskia at gcc dot gnu dot org 2007-04-29 8:58 ` belyshev at depni dot sinp dot msu dot ru 2007-04-30 2:25 ` bangerth at dealii dot org 2007-04-30 14:16 ` pluto at agmk dot net 2007-04-30 14:29 ` pluto at agmk dot net 2007-04-30 14:43 ` bangerth at dealii dot org 2007-05-01 1:11 ` giovannibajo at libero dot it 2007-05-01 1:39 ` bangerth at math dot tamu dot edu 2007-05-01 7:59 ` pluto at agmk dot net 2007-05-01 12:35 ` rguenth at gcc dot gnu dot org 2007-05-01 13:01 ` rguenth at gcc dot gnu dot org 2007-05-01 13:05 ` [Bug c++/30252] " rguenth at gcc dot gnu dot org 2007-05-02 20:59 ` mmitchel at gcc dot gnu dot org 2007-05-13 0:43 ` ismail at pardus dot org dot tr 2007-05-13 10:34 ` rguenth at gcc dot gnu dot org 2007-05-13 12:02 ` rguenth at gcc dot gnu dot org 2007-05-14 19:04 ` dberlin at gcc dot gnu dot org 2007-05-14 21:26 ` mmitchel at gcc dot gnu dot org 2007-05-15 7:59 ` rguenth at gcc dot gnu dot org 2007-06-04 15:28 ` rguenth at gcc dot gnu dot org [this message] 2007-06-04 15:45 ` rguenth at gcc dot gnu dot org 2007-06-05 9:27 ` rguenth at gcc dot gnu dot org 2007-06-05 12:05 ` rguenth at gcc dot gnu dot org 2007-06-05 15:01 ` rguenth at gcc dot gnu dot org 2007-06-05 15:57 ` rguenth at gcc dot gnu dot org 2007-06-05 16:20 ` dberlin at dberlin dot org 2007-06-05 16:30 ` rguenther at suse dot de 2007-06-05 17:45 ` dberlin at dberlin dot org 2007-06-05 18:25 ` matz at gcc dot gnu dot org 2007-06-05 19:07 ` dberlin at dberlin dot org 2007-06-05 19:59 ` rguenther at suse dot de 2007-06-05 22:44 ` dberlin at dberlin dot org 2007-06-06 8:50 ` rguenther at suse dot de 2007-06-06 15:52 ` dberlin at dberlin dot org 2007-06-19 9:24 ` rguenth at gcc dot gnu dot org 2007-06-19 9:46 ` rguenth at gcc dot gnu dot org
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