From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/4979 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: [PATCH 3/3] stddef: Define max_align_t Date: Mon, 28 Apr 2014 15:59:12 +0200 Message-ID: <1398693552.7944.69.camel@eris.loria.fr> References: <1398649434-23560-1-git-send-email-raj.khem@gmail.com> <1398649434-23560-3-git-send-email-raj.khem@gmail.com> <20140428020328.GV26358@brightrain.aerifal.cx> <20140428101156.GF12324@port70.net> <1398687764.7944.50.camel@eris.loria.fr> <20140428132645.GH12324@port70.net> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-FDYxdgdIAvBlhSSA/Ild" X-Trace: ger.gmane.org 1398693574 10256 80.91.229.3 (28 Apr 2014 13:59:34 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 28 Apr 2014 13:59:34 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-4983-gllmg-musl=m.gmane.org@lists.openwall.com Mon Apr 28 15:59:28 2014 Return-path: Envelope-to: gllmg-musl@plane.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by plane.gmane.org with smtp (Exim 4.69) (envelope-from ) id 1Wem5e-0004Bo-Af for gllmg-musl@plane.gmane.org; Mon, 28 Apr 2014 15:59:26 +0200 Original-Received: (qmail 1994 invoked by uid 550); 28 Apr 2014 13:59:25 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: Original-Received: (qmail 1986 invoked from network); 28 Apr 2014 13:59:25 -0000 X-IronPort-AV: E=Sophos;i="4.97,944,1389740400"; d="scan'";a="70807116" In-Reply-To: <20140428132645.GH12324@port70.net> Face: 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Cj15cu23XZI4/826Px/xqB37z547sPH374oOvnKTsOb+1zuCoImZARM8ZiLlKkXcWOcoFRJ+Do/CwFO4e2DEe+9Ti+ZXA8ny/cU+X4bMKRZxZIVEiqXI6/+NKuUzPHb7z40ovnX3zx+Ctuq38HyuqWG7Tu+A0AAAAASUVORK5CYII= X-Mailer: Evolution 3.2.3-0ubuntu6 Xref: news.gmane.org gmane.linux.lib.musl.general:4979 Archived-At: --=-FDYxdgdIAvBlhSSA/Ild Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Am Montag, den 28.04.2014, 15:26 +0200 schrieb Szabolcs Nagy: > no, long long (or any scalar type) cannot be an "over-aligned" type >=20 > "A type having an extended alignment requirement is an over-aligned type.= " > "Every over-aligned type is, or contains, a structure or union type with > a member to which an extended alignment has been applied." The later is a footnote and so not normative, merely an explanation. As a restrictive, normative text it makes not much sense to me anyhow. > > I am not sure that I remember correctly, but it seems to me that i386 > > allows for 4 byte alignment of all types, only that this results in > > suboptimal code >=20 > if long long has an alignment requirement of 4 byte then _Alignof should = say so I agree that this would certainly easier to cope with (the compiler could still place them silently on 8 byte boundaries, where it suits) > > > typedef char max_align_t __attribute__((aligned(__BIGGEST_ALIGNMENT_= _))); > > >=20 > > > which gives 16 byte alignment on i386 gcc, i thought it was supported > > > in all contexts > >=20 > > I think this just not necessary and even counter productive. >=20 > depends on what is the semantic meaning of max_align_t >=20 > currently it means "guaranteed to be supported in all contexts" I think this isn't explicitly mentioned somewhere, but my expectation is that the alignment of this type is the one that is guaranteed by malloc and friends. That should be the only semantic to expect from it. Jens --=20 :: INRIA Nancy Grand Est :: http://www.loria.fr/~gustedt/ :: :: AlGorille ::::::::::::::: office Nancy : +33 383593090 :: :: ICube :::::::::::::: office Strasbourg : +33 368854536 :: :: ::::::::::::::::::::::::::: gsm France : +33 651400183 :: :: :::::::::::::::::::: gsm international : +49 15737185122 :: --=-FDYxdgdIAvBlhSSA/Ild Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iEYEABECAAYFAlNeXrAACgkQD9PoadrVN+KqXgCffPEyZUYR+mZFn/N1MaioBNP+ XyIAn0GIuq7nTY1QS6pFkdlfWKLT/Cj4 =qTP5 -----END PGP SIGNATURE----- --=-FDYxdgdIAvBlhSSA/Ild--