On Mon, 2015-01-26 at 22:54 +0500, Andrey Rahmatullin wrote: > On Mon, Jan 26, 2015 at 01:14:39PM +0100, Nico Schlömer wrote: > You cannot unconditionally use instructions not supported by minimal CPUs > in each architecture, this means no MMX in i386 and only SSE2 and earlier > on amd64. You can enable anything at run time if support was detected.
The are exceptions, for example tbb (the Intel threading building blocks library) is available on i386, but it actually requires a Pentium 4 [1]. That said, IIRC some packages had special builds enabling certain optimizations, i.e. a package would expose a virtual libX that is provided by special builds libX-default, libX-sse, libX-sse2, and ... that all conflict and replace each other. I'm not sure if there are still libraries packaged like this in the archive though. Something like this would probably be easier to create from the packagers point of view than patching the upstream code to do run-time detection. There was also some discussion about this topic some time ago that considered providing all these libraries in one package, but installed in the proper places and then ld-linux.so.2+ldconfig apparently load the right library [2]. best Gert [1] https://www.threadingbuildingblocks.org/system-requirements [2] https://lists.debian.org/debian-mentors/2000/11/msg00238.html -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: https://lists.debian.org/[email protected]
