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From: "hp at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/108828] New: ivopts silencing
 gcc.dg/Wuse-after-free-2.c:115
Date: Thu, 16 Feb 2023 18:31:16 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108828

            Bug ID: 108828
           Summary: ivopts silencing gcc.dg/Wuse-after-free-2.c:115
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hp at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: cris-elf

Source from r13-5978-g4f5a1198065d.
Running the test-suite for a cross to cris-elf on x86_64-pc-linux-gnu shows
among other differences for cris-elf:

Running /x/gcc/gcc/testsuite/gcc.dg/dg.exp ...
FAIL: gcc.dg/Wuse-after-free-2.c  (test for warnings, line 115)
FAIL: gcc.dg/Wuse-after-free-2.c  (test for warnings, line 116)

Diffing tree dumps from -fdump-tree-all-all shows a suspicious difference in
the "180t.ivopts" dump compared to that of the native run; for cris-elf, II=
UC
some temporary object is introduced that causes dissociation with the
pointer...or something.  Anyway, "-fno-ivopts" makes the warning appear for
cris-elf.

I don't see this test-suite-failure for recent reports to gcc-testresults@ =
for
other targets (pru-unknown-elf, arm-unknown-linux-gnueabi,
powerpc64le-unknown-linux-gnu, aarch64-suse-linux-gnu, s390x-ibm-linux-gnu,
powerpc-ibm-aix7.2.5.0).
The test has failed since it's introduction; it's not a regression.=