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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/112740] New: [14 Regression] wrong code with vector
 compare on riscv64 at -O0
Date: Tue, 28 Nov 2023 06:34:58 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: zsojka at seznam dot cz
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112740

            Bug ID: 112740
           Summary: [14 Regression] wrong code with vector compare on
                    riscv64 at -O0
           Product: gcc
           Version: 14.0
            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 56704
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D56704&action=3Dedit
reduced testcase

Output:
$ riscv64-unknown-linux-gnu-gcc testcase.c -static
$ qemu-riscv64 -- ./a.out=20
Aborted

"x" is "ffff...ffff" instead of 0

I am using qemu userspace emulation, so this might be a false positive:

$ qemu-riscv64 -version
qemu-riscv64 version 8.1.3
Copyright (c) 2003-2023 Fabrice Bellard and the QEMU Project developers

$ 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-r14-5898-20231127211931-=
gce52f1f7074-checking-yes-rtl-df-extra-riscv64/bin/../libexec/gcc/riscv64-u=
nknown-linux-gnu/14.0.0/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-r14-5898-20231127211931-gce52f1f70=
74-checking-yes-rtl-df-extra-riscv64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 14.0.0 20231128 (experimental) (GCC)=