* bignum.c (bigdivrem_restoring): Use bigdivrem_single if non-topmost
  BDIGITs of y are zero.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42571 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* bignum.c (bigdivrem_single): Use shift when y is a power of two.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42572 b2dd03c8-39d4-4d8f-98ff-823fe69b080e