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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/103669] New: [12 Regression] wrong code with -O
 --param=modref-max-depth=1
Date: Sun, 12 Dec 2021 16:27:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103669

            Bug ID: 103669
           Summary: [12 Regression] wrong code with -O
                    --param=3Dmodref-max-depth=3D1
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu

Created attachment 51979
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D51979&action=3Dedit
reduced testcase (from OpenTTD sources)

Output:
$ x86_64-pc-linux-gnu-g++ -O --param=3Dmodref-max-depth=3D1 testcase.C
$ ./a.out=20
Aborted

$ x86_64-pc-linux-gnu-g++ -v
Using built-in specs.
COLLECT_GCC=3D/repo/gcc-trunk/binary-latest/bin/x86_64-pc-linux-gnu-g++
COLLECT_LTO_WRAPPER=3D/repo/gcc-trunk/binary-trunk-r12-5916-20211212131849-=
gaeedb00a1ae-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-l=
inux-gnu/12.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=3Dc,c++
--enable-valgrind-annotations --disable-nls --enable-checking=3Dyes,rtl,df,=
extra
--with-cloog --with-ppl --with-isl --build=3Dx86_64-pc-linux-gnu
--host=3Dx86_64-pc-linux-gnu --target=3Dx86_64-pc-linux-gnu
--with-ld=3D/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=3D/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch
--prefix=3D/repo/gcc-trunk//binary-trunk-r12-5916-20211212131849-gaeedb00a1=
ae-checking-yes-rtl-df-extra-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.0 20211212 (experimental) (GCC)=