From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/3278 Path: news.gmane.org!not-for-mail From: Jens Gustedt Newsgroups: gmane.linux.lib.musl.general Subject: Re: sign (in)consistency between architectures Date: Thu, 02 May 2013 14:12:37 +0200 Message-ID: <1367496757.28119.196.camel@eris.loria.fr> References: <51814B3F.4040005@eservices.virginia.edu> <20130501180015.GN12689@port70.net> <20130501200007.GM20323@brightrain.aerifal.cx> <20130501224132.GN20323@brightrain.aerifal.cx> <5181C3B4.4040801@eservices.virginia.edu> <20130502024753.GO20323@brightrain.aerifal.cx> <1367482359.28119.118.camel@eris.loria.fr> <20130502101351.GO12689@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="=-YewQkPh3Cpt54+LP6YlD" X-Trace: ger.gmane.org 1367496779 30450 80.91.229.3 (2 May 2013 12:12:59 GMT) 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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:3278 Archived-At: --=-YewQkPh3Cpt54+LP6YlD Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Am Donnerstag, den 02.05.2013, 12:13 +0200 schrieb Szabolcs Nagy: > * Jens Gustedt [2013-05-02 10:12:39 +0200]: > > I would prefer to have both worlds by using uint64_t (or directly the > > underlying base type) uniformly. There is no reason to have it signed: > >=20 >=20 > yes probably that's the best solution >=20 > but note that even that can hurt: i've seen code like >=20 > t =3D (double)clock(); >=20 > (eg the time module in python does this) where interesting > low bits may get lost if clock_t is uint64_t *and* if the actual value is larger than (1ull << 50) or something like that. An application that is interested in the low bits (probably most of them are) should probably compute the integer and fractional parts of the time in seconds by using CLOCKS_PER_SECOND, anyhow. > this might be common because clock_t is permitted to be > a floating-point type yes, any real type is permitted in C, I think. 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 :: --=-YewQkPh3Cpt54+LP6YlD 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) iEYEABECAAYFAlGCWDUACgkQD9PoadrVN+JCcACeKg5iEZ+E0otAZhSVmy19cpZl JnoAni0oqoRY46AYp5nZYh9k+WQXyhU2 =GAWL -----END PGP SIGNATURE----- --=-YewQkPh3Cpt54+LP6YlD--