Hate to followup to myself. On Fri, 31 May 2002, James Lockwood wrote: > One free implementation is ATLAS: > > http://math-atlas.sourceforge.net/ I just checked back and they have done a lot of platform-specific optimizing recently. I can't vouch for it personally but they claim large speedups on SSE, 3DNow, UltraSparc, AltiVec and others. -James