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From: "bic60176 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/115154] New: [13/14 Regression] wrong code at
 optimization levels -O2, -O3, -Os
Date: Sun, 19 May 2024 02:46:48 +0000
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X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.2.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115154

            Bug ID: 115154
           Summary: [13/14 Regression] wrong code at optimization levels
                    -O2, -O3, -Os
           Product: gcc
           Version: 13.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bic60176 at gmail dot com
  Target Milestone: ---

Created attachment 58242
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D58242&action=3Dedit
testcase

OS: Ubuntu 22.04.3 LTS

We found that there are discrepancies when compiling with gcc-13.2.0,
gcc-14.1.0 at optimization levels -O2, -O3, and -Os.

$ ../compiler-builds/gcc-13.2.0_build/bin/gcc -fsanitize=3Dundefined -g -lg=
cc_s
-I/home/csmith/include/csmith-2.3.0 -O2 testcase.c -o exec

$ timeout 1s ./exec 2>exec.err
f.b=3D0

$ ../compiler-builds/gcc-12.3.0_build/bin/gcc -fsanitize=3Dundefined -g -lg=
cc_s
-I/home/csmith/include/csmith-2.3.0 -O2 testcase.c -o exec

$ timeout 1s ./exec 2>exec.err
f.b=3D-1=