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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/103350] New: wrong code with -Os -fno-tree-ter
 on aarch64-unknown-linux-gnu
Date: Sun, 21 Nov 2021 19:44:48 +0000
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X-Bugzilla-Component: rtl-optimization
X-Bugzilla-Version: 12.0
X-Bugzilla-Keywords: wrong-code
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103350

            Bug ID: 103350
           Summary: wrong code with -Os -fno-tree-ter on
                    aarch64-unknown-linux-gnu
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: aarch64-unknown-linux-gnu

Created attachment 51844
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D51844&action=3Dedit
reduced testcase

Output:
$ aarch64-unknown-linux-gnu-gcc -Os -fno-tree-ter testcase.c -static
$ qemu-aarch64 -- ./a.out=20
qemu: uncaught target signal 6 (Aborted) - core dumped
Aborted

$ aarch64-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=3D/repo/gcc-trunk/binary-latest-aarch64/bin/aarch64-unknown-lin=
ux-gnu-gcc
COLLECT_LTO_WRAPPER=3D/repo/gcc-trunk/binary-trunk-r12-5436-20211121114008-=
gdc915b361bb-checking-yes-rtl-df-extra-aarch64/bin/../libexec/gcc/aarch64-u=
nknown-linux-gnu/12.0.0/lto-wrapper
Target: aarch64-unknown-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
--with-sysroot=3D/usr/aarch64-unknown-linux-gnu --build=3Dx86_64-pc-linux-g=
nu
--host=3Dx86_64-pc-linux-gnu --target=3Daarch64-unknown-linux-gnu
--with-ld=3D/usr/bin/aarch64-unknown-linux-gnu-ld
--with-as=3D/usr/bin/aarch64-unknown-linux-gnu-as --disable-libstdcxx-pch
--prefix=3D/repo/gcc-trunk//binary-trunk-r12-5436-20211121114008-gdc915b361=
bb-checking-yes-rtl-df-extra-aarch64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.0.0 20211121 (experimental) (GCC)=