Date: Wed, 10 Jul 2013 08:54:05 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: Peter Wemm <peter@wemm.org> Cc: Adrian Chadd <adrian@freebsd.org>, freebsd-arch@freebsd.org, Baptiste Daroussin <bapt@freebsd.org>, Andrew Turner <andrew@fubar.geek.nz> Subject: Re: Adding a MACHINE_ARCH note Message-ID: <F79E2F76-A234-499A-ABB7-1ABA62283E9D@FreeBSD.org> In-Reply-To: <CAGE5yCq9gQERDkbi4wu=6tNUap24ZR7sL7aF%2BzmEO0eT6nxPsA@mail.gmail.com> 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>
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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. > > 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. 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: 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%. As to how often it is actually used in practice, I am not sure. > gcc-4.8 and clang have it, or have patches for it. You also need a fairly recent binutils. And kernel + libc support... It is probably not a trivial task. :-) -Dimitry
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