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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/108947] New: [13 Regression] wrong code with -O2
 -fno-forward-propagate and vector compare on riscv64
Date: Mon, 27 Feb 2023 11:50:53 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: zsojka at seznam dot cz
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108947

            Bug ID: 108947
           Summary: [13 Regression] wrong code with -O2
                    -fno-forward-propagate and vector compare on riscv64
           Product: gcc
           Version: 13.0
            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: riscv64-unknown-linux-gnu

Created attachment 54543
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D54543&action=3Dedit
reduced testcase

Output:
$ riscv64-unknown-linux-gnu-gcc -O2 -fno-forward-propagate testcase.c -stat=
ic
$ qemu-riscv64 -- ./a.out=20
Aborted

w =3D=3D { 0, 0 } instead of { 0xffff, 0 }

$ riscv64-unknown-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=3D/repo/gcc-trunk/binary-latest-riscv64/bin/riscv64-unknown-lin=
ux-gnu-gcc
COLLECT_LTO_WRAPPER=3D/repo/gcc-trunk/binary-trunk-r13-6353-20230227090511-=
g529e03b9882-checking-yes-rtl-df-extra-riscv64/bin/../libexec/gcc/riscv64-u=
nknown-linux-gnu/13.0.1/lto-wrapper
Target: riscv64-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-isa-spec=3D2.2
--with-sysroot=3D/usr/riscv64-unknown-linux-gnu --build=3Dx86_64-pc-linux-g=
nu
--host=3Dx86_64-pc-linux-gnu --target=3Driscv64-unknown-linux-gnu
--with-ld=3D/usr/bin/riscv64-unknown-linux-gnu-ld
--with-as=3D/usr/bin/riscv64-unknown-linux-gnu-as --disable-multilib
--disable-libstdcxx-pch
--prefix=3D/repo/gcc-trunk//binary-trunk-r13-6353-20230227090511-g529e03b98=
82-checking-yes-rtl-df-extra-riscv64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 13.0.1 20230227 (experimental) (GCC)=