From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 74E243858418; Sat, 16 Oct 2021 12:43:56 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 74E243858418 From: "zsojka at seznam dot cz" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/102798] New: [9/10/11/12 Regression] wrong code with -O3 -fno-tree-pta -mavx512f Date: Sat, 16 Oct 2021 12:43:56 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Version: 12.0 X-Bugzilla-Keywords: wrong-code X-Bugzilla-Severity: normal X-Bugzilla-Who: zsojka at seznam dot cz X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status keywords bug_severity priority component assigned_to reporter target_milestone cf_gcchost cf_gcctarget attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 16 Oct 2021 12:43:56 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102798 Bug ID: 102798 Summary: [9/10/11/12 Regression] wrong code with -O3 -fno-tree-pta -mavx512f 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 51616 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D51616&action=3Dedit auto-reduced testcase (from OpenSSL sources) $ x86_64-pc-linux-gnu-gcc -O3 -fno-tree-pta -mavx512f testcase.c $ gdb ./a.out ... (gdb) r Starting program: /home/smatz/gcc-bug/58/a.out=20 Program received signal SIGSEGV, Segmentation fault. BUF_reverse (out=3D, out@entry=3D0x7fffffffda60 "", in=3D, in@entry=3D0x0, size=3Dsize@entry=3D40) at testcase.c:11 11 *out-- =3D *in++; (gdb) disas Dump of assembler code for function BUF_reverse: ... 0x0000000000401200 <+96>: and $0xffffffffffffffe0,%r9 0x0000000000401204 <+100>: add %rcx,%r9 0x0000000000401207 <+103>: nopw 0x0(%rax,%rax,1) =3D> 0x0000000000401210 <+112>: vmovdqu (%rdx),%ymm2 0x0000000000401214 <+116>: add $0x20,%rdx 0x0000000000401218 <+120>: sub $0x20,%rdi 0x000000000040121c <+124>: vperm2i128 $0x1,%ymm2,%ymm2,%ymm0 ... (gdb) info reg rax 0x28 40 rbx 0x4013d0 4199376 rcx 0x0 0 rdx 0x0 0 ... $ x86_64-pc-linux-gnu-gcc -v Using built-in specs. COLLECT_GCC=3D/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-g= cc COLLECT_LTO_WRAPPER=3D/repo/gcc-trunk/binary-trunk-r12-4456-20211016001627-= g93d183a5fff-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-r12-4456-20211016001627-g93d183a5f= ff-checking-yes-rtl-df-extra-amd64 Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 12.0.0 20211016 (experimental) (GCC)=