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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/94675] [9/10/11/12 regression] -Warray-bounds false positive with -O2 since r9-1948
Date: Mon, 06 Sep 2021 11:25:44 +0000 [thread overview]
Message-ID: <bug-94675-4-0mCY7RVBK8@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-94675-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94675
--- Comment #20 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
So on the trunk we get:
c_len.0_1 = c_len;
_2 = (long unsigned int) c_len.0_1;
_6 = &c + _2;
MEM <const void *> [(struct pstream_t *)&ps] = &c;
MEM <const void *> [(struct pstream_t *)&ps + 8B] = _6;
_17 = (signed long) c_len.0_1;
_11 = _17;
_12 = (long unsigned int) _11;
if (_12 > 6)
goto <bb 3>; [50.00%]
else
goto <bb 4>; [50.00%]
<bb 3> [local count: 483183820]:
ps.D.4009.s = &MEM <byte> [(void *)&c + 7B];
<bb 4> [local count: 590558005]:
Which is correct, I think the original testcase and the testcase in comment #1
and comment #11 are bogus and incorrect. There is always an out of bounds.
next prev parent reply other threads:[~2021-09-06 11:25 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-20 19:42 [Bug tree-optimization/94675] New: [9 regression] -Warray-bounds false positive with -O2 chantry.xavier at gmail dot com
2020-04-20 22:16 ` [Bug tree-optimization/94675] " msebor at gcc dot gnu.org
2020-04-21 6:51 ` chantry.xavier at gmail dot com
2020-04-21 7:04 ` marxin at gcc dot gnu.org
2020-04-21 7:46 ` rguenth at gcc dot gnu.org
2020-04-21 7:58 ` [Bug tree-optimization/94675] [9/10 " rguenth at gcc dot gnu.org
2020-04-21 7:59 ` jakub at gcc dot gnu.org
2020-04-21 8:06 ` [Bug tree-optimization/94675] [9/10 regression] -Warray-bounds false positive with -O2 since r9-1948 jakub at gcc dot gnu.org
2020-04-21 14:03 ` law at redhat dot com
2020-04-21 14:18 ` rguenther at suse dot de
2020-04-21 14:43 ` law at redhat dot com
2020-04-21 14:57 ` rguenther at suse dot de
2020-04-21 14:58 ` msebor at gcc dot gnu.org
2020-04-21 19:14 ` law at redhat dot com
2020-04-21 19:16 ` law at redhat dot com
2020-04-21 20:10 ` law at redhat dot com
2020-04-21 21:00 ` msebor at gcc dot gnu.org
2020-04-22 6:34 ` rguenther at suse dot de
2020-04-24 7:48 ` chantry.xavier at gmail dot com
2020-04-24 15:16 ` msebor at gcc dot gnu.org
2020-04-30 13:12 ` chantry.xavier at gmail dot com
2021-06-01 8:17 ` [Bug tree-optimization/94675] [9/10/11/12 " rguenth at gcc dot gnu.org
2021-09-06 11:25 ` pinskia at gcc dot gnu.org [this message]
2022-03-16 11:09 ` chantry.xavier at gmail dot com
2022-03-16 13:24 ` rguenth at gcc dot gnu.org
2022-05-27 9:42 ` [Bug tree-optimization/94675] [10/11/12/13 " rguenth at gcc dot gnu.org
2022-06-28 10:40 ` jakub at gcc dot gnu.org
2023-05-14 21:25 ` [Bug tree-optimization/94675] [10/11/12/13/14 " pinskia at gcc dot gnu.org
2023-07-07 10:37 ` [Bug tree-optimization/94675] [11/12/13/14 " rguenth at gcc dot gnu.org
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