Date: Wed, 10 Jul 2013 10:03:19 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Dimitry Andric <dim@FreeBSD.org> Cc: Adrian Chadd <adrian@freebsd.org>, Andrew Turner <andrew@fubar.geek.nz>, Baptiste Daroussin <bapt@freebsd.org>, freebsd-arch@freebsd.org Subject: Re: Adding a MACHINE_ARCH note Message-ID: <20130710070319.GX91021@kib.kiev.ua> In-Reply-To: <F79E2F76-A234-499A-ABB7-1ABA62283E9D@FreeBSD.org> References: <20130709090744.0e497e7e@bender.Home> <32F979BD-FB5C-4111-9586-4C5E7C6DFA71@bsdimp.com> <20130709234837.559e3769@bender.Home> <CAJ-Vmo=iV8BsGriFRgNuP-ZJdQhpmBLhjAkz-nSVRS0HPKSyOQ@mail.gmail.com> <CAGE5yCpJmRDvnaYtozj4bCqNoQXH=1e96HPJAqwJuRdn4H9BZA@mail.gmail.com> <CAJ-Vmo=tmGDW3Ubw9nr5rb30bXr1dcJUkKLOU7L=_bx29zvEhw@mail.gmail.com> <CAGE5yCq9gQERDkbi4wu=6tNUap24ZR7sL7aF%2BzmEO0eT6nxPsA@mail.gmail.com> <F79E2F76-A234-499A-ABB7-1ABA62283E9D@FreeBSD.org>
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--tWkvZsi8Zj/QU8J/ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Jul 10, 2013 at 08:54:05AM +0200, Dimitry Andric wrote: > On Jul 10, 2013, at 03:08, Peter Wemm <peter@wemm.org> wrote: > > On Tue, Jul 9, 2013 at 5:56 PM, Adrian Chadd <adrian@freebsd.org> wrote: > >> ... boy I'd like to see this particular x86 hiccup fixed before this > >> stuff is mainstream. > >=20 > > I'm not entirely sure how much support there is behind "x32". I don't > > know if its much more than an academic curiosity or if there's real > > demand for it. >=20 > It seems to be driven by Intel and Google. The idea is that for some > applications (or maybe even most :), an ILP32 model will perform better. > Quoting from one of the presentations: >=20 > On Core i7 2600K 3.40GHz: > - Improved SPEC CPU 2K/2006 INT geomean by 7-10% over ia32 and 5-8% over > Intel64. > - Improved SPEC CPU 2K/2006 FP geomean by 5-11% over ia32. > - Very little changes in SPEC CPU 2K/2006 FP geomean, comparing against > Intel64. > - Comparing against ia32 PIC, x32 PIC: > - Improved SPEC CPU 2K INT by another 10%. > - Improved SPEC CPU 2K FP by another 3%. > - Improved SPEC CPU 2006 INT by another 6% > - Improved SPEC CPU 2006 FP by another 2%. >=20 > As to how often it is actually used in practice, I am not sure. >=20 >=20 > > gcc-4.8 and clang have it, or have patches for it. >=20 > You also need a fairly recent binutils. And kernel + libc support... > It is probably not a trivial task. :-) You definitely need a support from libc, libthr and rtld. I am not convinced that the kernel modifications are needed, except for the image activator to recognize new ELF ids. In other words, I believe it is better to put shims into libc in the long run. --tWkvZsi8Zj/QU8J/ Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.20 (FreeBSD) iQIcBAEBAgAGBQJR3Qc3AAoJEJDCuSvBvK1BXe8P/jZ604xf7KW+UomlRISkVuaZ ye3QQLrvoMmnRYpNiLBnJ0l3RUP/qDlRCtqTopo2f1cEo0SyXZO1b3IpFXwLZwkS L5sTOjL2IB1nSXUgQ2tQXz9uu5njwmXYapQgLXseX+9dnS6iWQeWV8+RbrgR0Ul+ ifxQ9VUaV6/97caKu7NpwWs+BVcqBtPV0DHLmvUQWChSBFpHdQdnlsb5a7YF8G5k RAycGYO0Fb8jmLOMvWDnfWbejjvfFkdJPwX71YZ6haumYBVSwC5Uj1bdBtzubzBj MFkaGHua/RrAfjiW+tTpmzCsEpxuF7ZQcBiRXM2YW8y423Wz4e++MLde7eiMa0bw ZW97IJzwIr8FO+qcZi1ELvjwpeXsaiLUEpXHi/V8oNwocp0CcEnqVmpa9K/dEN8d 3UcebAToLRsbgeLv3UbmNIRq2V6K68Vz2WoSucYGwMfkk9Qd/uyhdh2DU7YF94Sl qxLCJyUcxpjMelTLy8MV/gjrg3/tDcgl8JtCmY75RPSgzI8rO1hIJJamdXMUvHml WYr0UM4vgiojkRm9wevxNGcPuFsaT/XSCoe5cprdq9qqXxXvLVrpLd9j/RpMuBhd pXzDYvfc1C23/YkB/KeEX8WqxzbkD4nDVxRIA2Fyf8iIHgJSRSAg2cmSqNG+E57s BjUytoPT7HWq21RaUcu1 =uUfA -----END PGP SIGNATURE----- --tWkvZsi8Zj/QU8J/--
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