Greetings! Richard Zidlicky <[EMAIL PROTECTED]> writes:
> On Tue, Feb 18, 2003 at 04:46:46PM -0500, Camm Maguire wrote: > > Greetings, and thanks for the insight. GCL does a subbuild of part of > > GMP. With the default configure script canonical host of > > m68k-unknown-linux-gnu, gmp3 adds -m68000 to the command line. > > this is slightly broken - there has never been 68000 support > in Linux. > > > Perhaps the autobuilders should use m68020-unknown-linux-gnu as the > > lowest common denominator? > > this would work but not very well on 68060 models though.. here > are the options: > a) use m68k-*linux WITHOUT -m68000 flag. Will loose some > performance on 68020-40 models, nearly optimal for 68060 > b) m68020-linux will loose *lots* of performance on 68060 models. > c) compile 2 versions of the library/program for 20-40 or 60 > models. > > (a) is pretty acceptable, (b) would be probably the worst alternative. > (c) would be nice and I think it is time to use multilibs for m68k-linux. > OK, this won't get done before the next release, but what I'd like to do is 1) benchmark the bignum code and see if these issues make a big difference, and 2) assuming yes to 1), implement a dynamic library alternative system as is done in atlas/lapack/blas on Debian GNU/Linux, say by building a libgcl_gmp.so. I don't know if you are familiar with how this works, but I'd like your feedback if you are interested. Basically, one can install several binary-compatible versions of the same library, and have the running cpu select the best one for its capabilities at run time via ld.so.conf. I've made a policy proposal, but thus far it has not received much interest: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=120418 In any case, this works great right now for blas and lapack API's on Debian, and quite a few packages rely on it. I feel this is the way to go for performance critical pieces of code in a generic distribution like Debian. Take care, > Richard > > > _______________________________________________ > Gcl-devel mailing list > [EMAIL PROTECTED] > http://mail.gnu.org/mailman/listinfo/gcl-devel > > > -- Camm Maguire [EMAIL PROTECTED] ========================================================================== "The earth is but one country, and mankind its citizens." -- Baha'u'llah
