Date: Sat, 26 Sep 2020 17:48:33 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> Cc: freebsd-current@freebsd.org Subject: Re: clang build buggy code with certain CPUTYPE setting Message-ID: <6AA016B6-EEAC-4580-B7F0-9D274ADA9E73@FreeBSD.org> In-Reply-To: <20200926114045.GA31128@plan-b.pwste.edu.pl> References: <20200926114045.GA31128@plan-b.pwste.edu.pl>
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[-- Attachment #1 --] On 26 Sep 2020, at 13:40, Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> wrote: > > I have done a few builds of CURRENT in a row one or two weeks apart. The > builds with CPUTYPE?=amdfam10 set produce buggy code, for example while > running mergemaster I get this error: > > PLEASE submit a bug report to https://bugs.freebsd.org/submit/ and > include the crash backtrace, preprocessed source, and associated run > script. > Stack dump: > 0. Program arguments: cc --version > #0 0x00000000040ede6e (/usr/bin/cc+0x40ede6e) > #1 0x00000000040ec0e5 (/usr/bin/cc+0x40ec0e5) > #2 0x00000000040ee550 (/usr/bin/cc+0x40ee550) > #3 0x000000080553babe (/lib/libthr.so.3+0x19abe) > Illegal instruction > make: "/usr/src/share/mk/bsd.compiler.mk" line 181: Unable to determine > compiler type for CC=cc. Consider setting COMPILER_TYPE. > > The 13-CURRENT world built without CPUTYPE runs fine, the same for > recent 12.2-STABLE world build with CPUTYPE?=amdfam10 on the same > machine. Hi Marek, In r365507 (on 2020-09-09) I committed a fix for amdfam10: ------------------------------------------------------------------------ r365507 | dim | 2020-09-09 20:11:04 +0200 (Wed, 09 Sep 2020) | 17 lines Merge commit e6bb4c8e7 from llvm git (by Craig Topper): [X86] SSE4_A should only imply SSE3 not SSSE3 in the frontend. SSE4_1 and SSE4_2 due imply SSSE3. So I guess I got confused when switching the code to being table based in D83273. Fixes PR47464 This should fix builds with -march=amdfam10 emitting SSSE3 instructions such as pshufb, which lead to programs crashing with SIGILL on such processors. Reported by: avg MFC after: 6 weeks X-MFC-With: r364284 So I expect that the "Illegal instruction" you are seeing is an SSSE3 instruction. If this happens with your base compiler, please get a known-good copy from one of the snapshot images. Ensure your /usr/src is r365507 or later, then do a full buildworld and reinstall. -Dimitry [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.2 iFwEARECAB0WIQR6tGLSzjX8bUI5T82wXqMKLiCWowUCX29i0gAKCRCwXqMKLiCW o9GbAJYiNkXYA4MMCdi1DQ7JPi+S9TUJAKDw8QLjUFqT5ntPcuLEDqCO6rOtXg== =HBEa -----END PGP SIGNATURE-----help
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