* bignum.c: Don't use toom3 after once karatsuba is choosen.

  (mulfunc_t): New type.
  (bary_mul_toom3_start): Renamed from bary_mul.
  (bary_mul_karatsuba_start): Renamed from bary_mul.
  (bary_mul_balance_with_mulfunc): Renamed from bary_mul_balance and
  new argument, mulfunc, is added.
  (rb_big_mul_balance): Invoke bary_mul_balance_with_mulfunc with
  bary_mul_toom3_start.
  (bary_mul_karatsuba): Invoke bary_mul_karatsuba_start instead of
  bary_mul.
  (bary_mul_precheck): Extracted from bary_mul.
  (bary_mul_karatsuba_branch): Extracted from bary_mul.
  (bary_mul_karatsuba_start): New function to call bary_mul_precheck
  and bary_mul_karatsuba_branch.
  (bary_mul_toom3_branch): Extracted from bary_mul.
  (bary_mul_toom3_start): New function to call bary_mul_precheck and
  bary_mul_toom3_branch.
  (bary_mul): Just call bary_mul_toom3_start.
  Arguments for work memory are removed.
  (rb_cstr_to_inum): Follow the bary_mul change.
  (bigmul0): Ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41913 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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