1  /* mpn_mulmid_n -- balanced middle product
       2  
       3     Contributed by David Harvey.
       4  
       5     THE FUNCTION IN THIS FILE IS INTERNAL WITH A MUTABLE INTERFACE.  IT IS ONLY
       6     SAFE TO REACH IT THROUGH DOCUMENTED INTERFACES.  IN FACT, IT IS ALMOST
       7     GUARANTEED THAT IT'LL CHANGE OR DISAPPEAR IN A FUTURE GNU MP RELEASE.
       8  
       9  Copyright 2011 Free Software Foundation, Inc.
      10  
      11  This file is part of the GNU MP Library.
      12  
      13  The GNU MP Library is free software; you can redistribute it and/or modify
      14  it under the terms of either:
      15  
      16    * the GNU Lesser General Public License as published by the Free
      17      Software Foundation; either version 3 of the License, or (at your
      18      option) any later version.
      19  
      20  or
      21  
      22    * the GNU General Public License as published by the Free Software
      23      Foundation; either version 2 of the License, or (at your option) any
      24      later version.
      25  
      26  or both in parallel, as here.
      27  
      28  The GNU MP Library is distributed in the hope that it will be useful, but
      29  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
      30  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      31  for more details.
      32  
      33  You should have received copies of the GNU General Public License and the
      34  GNU Lesser General Public License along with the GNU MP Library.  If not,
      35  see https://www.gnu.org/licenses/.  */
      36  
      37  
      38  #include "gmp-impl.h"
      39  
      40  
      41  void
      42  mpn_mulmid_n (mp_ptr rp, mp_srcptr ap, mp_srcptr bp, mp_size_t n)
      43  {
      44    ASSERT (n >= 1);
      45    ASSERT (! MPN_OVERLAP_P (rp, n + 2, ap, 2*n - 1));
      46    ASSERT (! MPN_OVERLAP_P (rp, n + 2, bp, n));
      47  
      48    if (n < MULMID_TOOM42_THRESHOLD)
      49      {
      50        mpn_mulmid_basecase (rp, ap, 2*n - 1, bp, n);
      51      }
      52    else
      53      {
      54        mp_ptr scratch;
      55        TMP_DECL;
      56        TMP_MARK;
      57        scratch = TMP_ALLOC_LIMBS (mpn_toom42_mulmid_itch (n));
      58        mpn_toom42_mulmid (rp, ap, bp, n, scratch);
      59        TMP_FREE;
      60      }
      61  }