Improvements for power64/mode64

[Torbjorn Granlund]

Mark Rodenkirch <mgrogue at wi.rr.com> writes:

  Assuming I understand how to use speed correctly I am getting about  
  between 8.6 and 8.7 cycles per limb for both addmul and submul.   
  sqr_diagonal is between 7.8 and 7.9 cycles per limb.  If you have a  
  single use of speed that lets both of us know that I am comparing  
  apples to apples, that would be great.
  
A typical use would be

        speed -C -s1-1000 -f1.1 mpn_addmul_1.1 mpn_submul_1.1

-- 
Torbjörn