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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/113396] New: csmith: differences from -O2 to -O3
Date: Mon, 15 Jan 2024 11:53:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113396

            Bug ID: 113396
           Summary: csmith: differences from -O2 to -O3
           Product: gcc
           Version: 14.0
            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 57082
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D57082&action=3Dedit
C source code

The attached Csmith generated code does this:

foundBugs $ ~/gcc/results/bin/gcc -w bug998.c
foundBugs $ valgrind -q ./a.out
checksum =3D 77A231E6
foundBugs $ ~/gcc/results/bin/gcc -w -O2 bug998.c
foundBugs $ valgrind -q ./a.out
checksum =3D 77A231E6
foundBugs $ ~/gcc/results/bin/gcc -w -O3 bug998.c
foundBugs $ valgrind -q ./a.out
checksum =3D 130B5204
foundBugs $ ~/gcc/results/bin/gcc -w -O3 -fno-strict-aliasing
-fno-loop-interchange bug998.c
foundBugs $ valgrind -q ./a.out
checksum =3D 130B5204
foundBugs $=