Date: Sat, 13 Sep 2014 22:52:54 +0400 From: Andrey Chernov <ache@freebsd.org> To: Dimitry Andric <dim@FreeBSD.org> Cc: toolchain@freebsd.org Subject: Re: clang makes segfaulting code with -march=core2 on i386 Message-ID: <54149286.80608@freebsd.org> In-Reply-To: <CC121A4D-A6D0-430B-B15F-BFB48C5FB6E6@FreeBSD.org> References: <54130AD0.8090103@freebsd.org> <A212D7AF-4DA7-4043-BB73-1746A5C2F42F@FreeBSD.org> <54133E1E.9030105@freebsd.org> <54135B24.5040905@freebsd.org> <54135D0B.7060701@freebsd.org> <6FDF432B-8245-4BC7-952B-DFFEEA106D6F@FreeBSD.org> <5414865A.6030101@freebsd.org> <CC121A4D-A6D0-430B-B15F-BFB48C5FB6E6@FreeBSD.org>
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This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --9TuO7hLcmsFCUr6gT8Q63VCkDg5G6qB7f Content-Type: text/plain; charset=koi8-r Content-Transfer-Encoding: quoted-printable On 13.09.2014 22:30, Dimitry Andric wrote: >> By first glance I see a lots of <optimized out> things. It is known th= at >> in edge cases gcc preserves more "unused" values than clang. It can be= >> the possible case. I'll try to lower -O level preserving -march=3Dcore= 2 >> and see. >=20 > It seems to work for me with -O1 -march=3Dcore2, and while valgrind doe= s > complain a little, the warnings are all benign. >=20 > I'll see if I can "mix and match" a few -O2 and -O1 compiled objects, t= o > zero in on where the problematic area(s) are. I can confirm that it works with -march=3Dcore2 and without -O at all or with -O1. So it looks very match like overoptimization in clang. --=20 http://ache.vniz.net/ --9TuO7hLcmsFCUr6gT8Q63VCkDg5G6qB7f Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEcBAEBCAAGBQJUFJKGAAoJEKUckv0MjfbKGCQH/3DIJ+bOv8boGbr0xe4wh4nB 11cgEAKolrNH6qJBzkiASFnScHgN+wMHItwiSYCZ5l24Birw9ev0K/UKdGFmCgiW OOTcEzFed1dIC7R5oCxN5d3NgiN1jQNRPXL4GFa1TPB+e5fV4E9FhvBha/p1shWe 9q1JCWyRhhRj2gvC5SwmnZHxiiPngc/Y4Nihpag6IfnLbwLb8OgqA/jTmuIZQNgN vtphxlMSM3igAix91BU4cfoCWyxzYq7IFJjCa5uWFET4R86epdXX+mPtd5D3fP6t FCld0k2VbOheH/7srIjoU841huZ+ybQWBWLeH0/FmjF4jjoTswmGJ1MRAk9epyI= =JJaf -----END PGP SIGNATURE----- --9TuO7hLcmsFCUr6gT8Q63VCkDg5G6qB7f--
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