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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libquadmath/] [printf/] [add_n.c] - Blame information for rev 775

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1 740 jeremybenn
/* mpn_add_n -- Add two limb vectors of equal, non-zero length.
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Copyright (C) 1992, 1993, 1994, 1996 Free Software Foundation, Inc.
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This file is part of the GNU MP Library.
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The GNU MP Library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or (at your
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option) any later version.
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The GNU MP Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA. */
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#include <config.h>
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#include "gmp-impl.h"
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mp_limb_t
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#if __STDC__
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mpn_add_n (mp_ptr res_ptr, mp_srcptr s1_ptr, mp_srcptr s2_ptr, mp_size_t size)
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#else
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mpn_add_n (res_ptr, s1_ptr, s2_ptr, size)
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     register mp_ptr res_ptr;
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     register mp_srcptr s1_ptr;
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     register mp_srcptr s2_ptr;
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     mp_size_t size;
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#endif
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{
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  register mp_limb_t x, y, cy;
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  register mp_size_t j;
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  /* The loop counter and index J goes from -SIZE to -1.  This way
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     the loop becomes faster.  */
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  j = -size;
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  /* Offset the base pointers to compensate for the negative indices.  */
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  s1_ptr -= j;
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  s2_ptr -= j;
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  res_ptr -= j;
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  cy = 0;
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  do
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    {
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      y = s2_ptr[j];
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      x = s1_ptr[j];
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      y += cy;                  /* add previous carry to one addend */
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      cy = (y < cy);            /* get out carry from that addition */
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      y = x + y;                /* add other addend */
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      cy = (y < x) + cy;        /* get out carry from that add, combine */
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      res_ptr[j] = y;
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    }
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  while (++j != 0);
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  return cy;
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}

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