I've added the framework for Altivec, and implemented gr_fir_fff_altivec using it. This gives a speedup of between 1.8 and 3.0 depending on the type of machine it's running on. There's probably another factor of 1.25 - 1.50 that can be obtained by recoding dotprod_fff_altivec.c directly in assembler (I coded it using C intrinsics). The compiler is generating about 20% more instructions in the inner loop than is necessary. Also, it may be possible to improve dispatch by hand-scheduling the assembly.
This code lives in the features/mp-sched branch. I'm not planning on doing anything more on Altivec at this time. If you're interested in adding the rest of the support, the framework is complete. Take a look in filter/*-powerpc* and filter/*altivec* Eric _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
