From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 8CBF73858CD1; Thu, 21 Mar 2024 12:52:08 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 8CBF73858CD1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1711025528; bh=STt8BcVRLT/IzdTY7TfYARqMlJ9j+gqbOtAplzervjU=; h=From:To:Subject:Date:From; b=y40Z4d9i5gRQjoFaQEnf3wKprOKCnL3kz1yS1G/ZOJqJ2YIITiAjwJR+BhxUDicBd bRA09QbHiFhOOk8Nq3rbdc0wUVGg27DCX+3KrH+RHDnfhZiXdVhgATvOAakDUsct/p WOcfsnRDiSxIKC5XqDZk+8kUdOtFjndsGIPGLg90= From: "zsojka at seznam dot cz" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/114415] New: wrong code with -Oz -fno-dce -fno-forward-propagate -flive-range-shrinkage -fweb Date: Thu, 21 Mar 2024 12:52:07 +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: 14.0 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114415 Bug ID: 114415 Summary: wrong code with -Oz -fno-dce -fno-forward-propagate -flive-range-shrinkage -fweb 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: x86_64-pc-linux-gnu Created attachment 57755 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D57755&action=3Dedit reduced testcase Output: $ x86_64-pc-linux-gnu-gcc -Oz -fno-dce -fno-forward-propagate -flive-range-shrinkage -fweb testcase.c -Wno-psabi $ ./a.out=20 Aborted It seems the issue is in: 0x000000000040137e <+214>: movq $0x1,-0x1b0(%rbp) 0x0000000000401389 <+225>: push $0x10 0x000000000040138b <+227>: pop %rcx 0x000000000040138c <+228>: rep movsl %ds:(%rsi),%es:(%rdi) =3D> 0x000000000040138e <+230>: push $0x10 0x0000000000401390 <+232>: mov %rbx,%rdi 0x0000000000401393 <+235>: lea -0xf0(%rbp),%rsi 0x000000000040139a <+242>: pop %rcx (gdb) p $rsp $48 =3D (void *) 0x7fffffffd3c0 (gdb) p/x $rdi $50 =3D 0x7fffffffd3c0 that "push" overwrites the destination of the just finished "rep movsd"; th= is is probably specific to -Oz $ 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-r14-9591-20240321175934-= gac2f8c2a367-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc= /x86_64-pc-linux-gnu/14.0.1/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 --disable-bootstrap --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 --enable-libsanitizer --disable-libstdcxx-pch --prefix=3D/repo/gcc-trunk//binary-trunk-r14-9591-20240321175934-gac2f8c2a3= 67-checking-yes-rtl-df-extra-nobootstrap-amd64 Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 14.0.1 20240321 (experimental) (GCC)=