Re: PowerPC GMP Improvement

[Torbjorn Granlund]

Nate Begeman <address@hidden> writes:

  I was wondering if there is an ongoing effort to improve the speed of GMP
  using Motorola's AltiVec ISA extension to PowerPC.  If not, I'm willing to
  tackle it over the next few weeks.  Just as a warmup, I have population
  count running at about 10 bits per clock, which isn't too bad for a chip
  that doesn't have a popcount instruction.
  
Kevin has been working on some PowerPC improvements recently.
I don't think he's worked on any SIMD stuff.

Note that only older G4 chips will bnefit from SIMD code; newer ones
(7440 and up) have pipelined 32x32->64 bit integer multiply, which
almost surely will be faster.