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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/109031] New: csmith: possible bad code with -O2
 -fno-strict-aliasing
Date: Sun, 05 Mar 2023 21:26:48 +0000
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X-Bugzilla-Component: c
X-Bugzilla-Version: 13.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109031

            Bug ID: 109031
           Summary: csmith: possible bad code with -O2
                    -fno-strict-aliasing
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 54588
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54588&action=3Dedit
C source code

For the attached C code:

$ for i in ~/gcc/results.2022*/bin/gcc
$ do=20
$ echo $i
$ $i -O2 -fno-strict-aliasing -w bug892.c; ./a.out  1 2>&1 | fgrep g_50;=20
$ done
/home/dcb36/gcc/results.20220306/bin/gcc
...checksum after hashing g_50 : 646CF84D
/home/dcb36/gcc/results.20220403/bin/gcc
...checksum after hashing g_50 : 646CF84D
/home/dcb36/gcc/results.20220501/bin/gcc
...checksum after hashing g_50 : 646CF84D
/home/dcb36/gcc/results.20220605/bin/gcc
...checksum after hashing g_50 : C21BF3F9
/home/dcb36/gcc/results.20220703/bin/gcc
$

The git hash for 20220501 is g:75bbc3da3e5f75f683fa33e309045c582efd20eb
and for 20220605 is g:ad6919374beafac4ec1a2f8059620f261019b02f=