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Diff for /OpenXM_contrib/gmp/mpn/generic/Attic/submul_1.c between version 1.1 and 1.1.1.3

version 1.1, 2000/01/10 15:35:24 version 1.1.1.3, 2003/08/25 16:06:20
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 /* mpn_submul_1 -- multiply the S1_SIZE long limb vector pointed to by S1_PTR  /* mpn_submul_1 -- multiply the N long limb vector pointed to by UP by VL,
    by S2_LIMB, subtract the S1_SIZE least significant limbs of the product     subtract the N least significant limbs of the product from the limb
    from the limb vector pointed to by RES_PTR.  Return the most significant     vector pointed to by RP.  Return the most significant limb of the
    limb of the product, adjusted for carry-out from the subtraction.     product, adjusted for carry-out from the subtraction.
   
 Copyright (C) 1992, 1993, 1994, 1996 Free Software Foundation, Inc.  Copyright 1992, 1993, 1994, 1996, 2000, 2002 Free Software Foundation, Inc.
   
 This file is part of the GNU MP Library.  This file is part of the GNU MP Library.
   
 The GNU MP Library is free software; you can redistribute it and/or modify  The GNU MP Library is free software; you can redistribute it and/or modify
 it under the terms of the GNU Library General Public License as published by  it under the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation; either version 2 of the License, or (at your  the Free Software Foundation; either version 2.1 of the License, or (at your
 option) any later version.  option) any later version.
   
 The GNU MP Library is distributed in the hope that it will be useful, but  The GNU MP Library is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 License for more details.  License for more details.
   
 You should have received a copy of the GNU Library General Public License  You should have received a copy of the GNU Lesser General Public License
 along with the GNU MP Library; see the file COPYING.LIB.  If not, write to  along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,  the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 MA 02111-1307, USA. */  MA 02111-1307, USA. */
Line 26  MA 02111-1307, USA. */
Line 26  MA 02111-1307, USA. */
 #include "gmp-impl.h"  #include "gmp-impl.h"
 #include "longlong.h"  #include "longlong.h"
   
   
   #if GMP_NAIL_BITS == 0
   
 mp_limb_t  mp_limb_t
 mpn_submul_1 (res_ptr, s1_ptr, s1_size, s2_limb)  mpn_submul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t vl)
      register mp_ptr res_ptr;  
      register mp_srcptr s1_ptr;  
      mp_size_t s1_size;  
      register mp_limb_t s2_limb;  
 {  {
   register mp_limb_t cy_limb;    mp_limb_t ul, cl, hpl, lpl, rl;
   register mp_size_t j;  
   register mp_limb_t prod_high, prod_low;  
   register mp_limb_t x;  
   
   /* The loop counter and index J goes from -SIZE to -1.  This way    ASSERT (n >= 1);
      the loop becomes faster.  */    ASSERT (MPN_SAME_OR_SEPARATE_P (rp, up, n));
   j = -s1_size;  
   
   /* Offset the base pointers to compensate for the negative indices.  */    cl = 0;
   res_ptr -= j;  
   s1_ptr -= j;  
   
   cy_limb = 0;  
   do    do
     {      {
       umul_ppmm (prod_high, prod_low, s1_ptr[j], s2_limb);        ul = *up++;
         umul_ppmm (hpl, lpl, ul, vl);
   
       prod_low += cy_limb;        lpl += cl;
       cy_limb = (prod_low < cy_limb) + prod_high;        cl = (lpl < cl) + hpl;
   
       x = res_ptr[j];        rl = *rp;
       prod_low = x - prod_low;        lpl = rl - lpl;
       cy_limb += (prod_low > x);        cl += lpl > rl;
       res_ptr[j] = prod_low;        *rp++ = lpl;
     }      }
   while (++j != 0);    while (--n != 0);
   
   return cy_limb;    return cl;
 }  }
   
   #endif
   
   #if GMP_NAIL_BITS == 1
   you lose
   #endif
   
   #if GMP_NAIL_BITS >= 2
   
   mp_limb_t
   mpn_submul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t vl)
   {
     mp_limb_t shifted_vl, ul, rl, lpl, hpl, prev_hpl, xw, cl, xl;
   
     ASSERT (n >= 1);
     ASSERT (MPN_SAME_OR_SEPARATE_P (rp, up, n));
     ASSERT_MPN (rp, n);
     ASSERT_MPN (up, n);
     ASSERT_LIMB (vl);
   
     shifted_vl = vl << GMP_NAIL_BITS;
     cl = 0;
     prev_hpl = 0;
     do
       {
         ul = *up++;
         rl = *rp;
         umul_ppmm (hpl, lpl, ul, shifted_vl);
         lpl >>= GMP_NAIL_BITS;
         xw = rl - (prev_hpl + lpl) + cl;
         cl = (mp_limb_signed_t) xw >> GMP_NUMB_BITS; /* FIXME: non-portable */
         xl = xw & GMP_NUMB_MASK;
         *rp++ = xl;
         prev_hpl = hpl;
       }
     while (--n != 0);
   
     return prev_hpl - cl;
   }
   
   #endif
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