On Thu, Jul 15, 2010 at 08:06:42PM +0300, Konstantinos Margaritis wrote: > On Thursday 15 July 2010 19:48:43 Aurelien Jarno wrote: > > Note that the new alternative to hwcap is called "multiarch" in the GNU > > libc (something totally different than "multiarch" in Debian). It allows > > to provide different versions of a given symbol using an IFUNC symbol > > type. This will be resolved by the dynamic loader during relocation > > depending on the hardware characteristics. > > > > This avoid building multiple version of the same software (but still > > multiple versions of a given function), and to introduce more > > granularity (e.g. on x86 SSE, SSE2, SSE3, SSSE4.2, AVX, etc). > > So, in essence an application/library can include in the same binary multiple > versions of the same function and the system picks one depending on the > current cpu capabilities? So things like autodetecting SSE/Altivec, etc are > not needed anymore?
For libraries sure. I think it might be possible to also get it working for binaries, though I haven't looked more in details. Note that you need a recent toolchain for that (binutils and glibc). > > Currently only x86, x86_64, ia64, powerpc and sparc are supported, but > > it should not be difficult to add support for more architectures. > > I'm interested in that, is it documented somewhere? ( I know the old hwcap > was > not at all, unless one wanted to read half of glibc source code). > I am afraid there are not a lot of documentation, beside the glibc source code. This patch can be interesting though: http://old.nabble.com/indirect-function-support-td28576476.html -- Aurelien Jarno GPG: 1024D/F1BCDB73 aurel...@aurel32.net http://www.aurel32.net -- To UNSUBSCRIBE, email to debian-dpkg-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20100715174325.gt18...@hall.aurel32.net
