On 09/15/2014 04:04 PM, Mathieu Malaterre wrote: > On Sun, Sep 14, 2014 at 8:47 AM, Sébastien Villemot > <sebast...@debian.org> wrote: >> Hi, >> >> As the maintainer of julia (a technical computing language built on top >> of LLVM), I am wondering whether I should continue supporting the i386 >> architecture. >> >> The bottom line is that julia needs SSE2 (and porting it to the x87 FPU >> requires changes that are beyond what I am willing/able to do, see [1] >> for more details). And the presence of SSE2 is not guaranteed on the >> i386 architecture. > > As per ld.so man page: > > HARDWARE CAPABILITIES > Libraries might be compiled using hardware-specific > instructions which do not exist on all CPU. Such libraries should be > installed in directories whose name defines > the hardware capabilities such as /usr/lib/sse2/. The dynamic > linker checks these directories against the hardware of the machine > and selects the best suitable ver‐ > sion of a given library. Hardware capabilities directories > could be cascaded to combine CPU features. Hardware capabilities > depends on the CPU. The following names > are currently recognized: > [...] > x86 (32-bit only) > acpi, apic, clflush, cmov, cx8, dts, fxsr, ht, i386, > i486, i586, i686, mca, mmx, mtrr, pat, pbe, pge, pn, pse36, sep, ss, > sse, sse2, tm > > HTH
Thanks. That's nice, however, what if a library needs SSE4.2? Two of my packages, eg libjerasure2 and libgf-complete1, would benefit from major speed-up if there was SSE4 available. I have currently disabled all SSE stuff, and would really like to provide an SSE4.2 version as well. I suppose (according to what's above) that using /usr/lib/sse4.2/x86_64-linux-gnu isn't supported (yet), right? (note: I already asked upstream if it was possible to do runtime detection, and the answer is currently no, unfortunately) Cheers, Thomas Goirand (zigo) -- To UNSUBSCRIBE, email to debian-devel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/5416a905.3000...@debian.org
