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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/100623] New: [10/11/12 Regression] wrong code with -Os
 -fno-dce -fno-defer-pop -fno-forward-propagate -flive-range-shrinkage
 -fno-rerun-cse-after-loop -mno-push-args
Date: Sun, 16 May 2021 14:46:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100623

            Bug ID: 100623
           Summary: [10/11/12 Regression] wrong code with -Os -fno-dce
                    -fno-defer-pop -fno-forward-propagate
                    -flive-range-shrinkage -fno-rerun-cse-after-loop
                    -mno-push-args
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu

Created attachment 50819
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D50819&action=3Dedit
reduced testcase (from openssl sources)

Output:
$ x86_64-pc-linux-gnu-gcc -Os -fno-dce -fno-defer-pop -fno-forward-propagate
-flive-range-shrinkage -fno-rerun-cse-after-loop -mno-push-args testcase.c
$ ./a.out=20
Aborted

bn_add_words() is called with r =3D=3D NULL

$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=3D/repo/gcc-trunk/binary-latest/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=3D/repo/gcc-trunk/binary-trunk-r12-815-20210516001637-g=
1ba3f0ef546-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-li=
nux-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-r12-815-20210516001637-g1ba3f0ef54=
6-checking-yes-rtl-df-extra-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.0 20210516 (experimental) (GCC)=