remove extra division in mpq/aors.c

Torbjorn Granlund tg at
Tue Mar 1 18:18:24 CET 2011

Marc Glisse <marc.glisse at> writes:

  Just to make my earlier remarks more constructive, 2 versions of what
  I was suggesting are attached.

The scalar division by dl isn't good, it is a very slow operation (think
~70 cycles on a modern CPU).  It might look cumbersome to test for 3 and
5 separately, but since the divisors come from gcd, these will be very
common cases, and 3 will be considerably mode common than 5.

I'll follow some of your suggestions, though.


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