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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/98503] [11 regression] -Warray-bounds false positive with global variables at -O2 since r11-3306-g3f9a497d1b0dd9da
Date: Mon, 04 Jan 2021 17:41:03 +0000 [thread overview]
Message-ID: <bug-98503-4-vuGEKM0pEt@http.gcc.gnu.org/bugzilla/> (raw)
In-Reply-To: <bug-98503-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98503
Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |INVALID
--- Comment #6 from Martin Sebor <msebor at gcc dot gnu.org> ---
In the test case in comment #0 the operand of the return statement in first()
dereferences the tmp pointer:
return tmp->list.n;
The expression is equivalent to (*tmp).list.n where the dereference should be
more obvious. The dereference is invalid if tmp points to an object of an
incompatible type. This is a basic type-based aliasing requirement that GCC
relies on.
If the test case isn't representative of the problem you see in the code base
please submit one that does.
next prev parent reply other threads:[~2021-01-04 17:41 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-03 7:53 [Bug c/98503] New: [11 regression] -Warray-bounds false positive with global variables at -O2 w at 1wt dot eu
2021-01-03 7:56 ` [Bug c/98503] " w at 1wt dot eu
2021-01-04 12:33 ` [Bug c/98503] [11 regression] -Warray-bounds false positive with global variables at -O2 since r11-3306-g3f9a497d1b0dd9da marxin at gcc dot gnu.org
2021-01-04 16:06 ` msebor at gcc dot gnu.org
2021-01-04 16:17 ` w at 1wt dot eu
2021-01-04 16:19 ` w at 1wt dot eu
2021-01-04 17:41 ` msebor at gcc dot gnu.org [this message]
2021-01-04 22:43 ` w at 1wt dot eu
2021-01-05 11:16 ` rguenth at gcc dot gnu.org
2021-01-05 11:34 ` w at 1wt dot eu
2021-01-05 17:31 ` msebor at gcc dot gnu.org
2021-01-28 23:06 ` [Bug middle-end/98503] " msebor at gcc dot gnu.org
2021-04-27 11:40 ` [Bug middle-end/98503] [11/12 " jakub at gcc dot gnu.org
2021-05-05 16:52 ` msebor at gcc dot gnu.org
2021-05-05 17:16 ` w at 1wt dot eu
2021-07-28 7:05 ` rguenth at gcc dot gnu.org
2021-11-17 22:34 ` msebor at gcc dot gnu.org
2022-03-08 0:03 ` msebor at gcc dot gnu.org
2022-03-23 8:31 ` rguenth at gcc dot gnu.org
2022-03-23 9:32 ` w at 1wt dot eu
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