===================================================================
RCS file: /home/cvs/OpenXM_contrib/gmp/mpn/generic/Attic/sub_n.c,v
retrieving revision 1.1.1.1
retrieving revision 1.1.1.3
diff -u -p -r1.1.1.1 -r1.1.1.3
--- OpenXM_contrib/gmp/mpn/generic/Attic/sub_n.c	2000/01/10 15:35:24	1.1.1.1
+++ OpenXM_contrib/gmp/mpn/generic/Attic/sub_n.c	2003/08/25 16:06:20	1.1.1.3
@@ -1,20 +1,20 @@
-/* mpn_sub_n -- Subtract two limb vectors of equal, non-zero length.
+/* mpn_sub_n -- Subtract equal length limb vectors.
 
-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.
 
 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
-the Free Software Foundation; either version 2 of the License, or (at your
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or (at your
 option) any later version.
 
 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
-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.
 
-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
 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 MA 02111-1307, USA. */
@@ -22,41 +22,60 @@ MA 02111-1307, USA. */
 #include "gmp.h"
 #include "gmp-impl.h"
 
+
+#if GMP_NAIL_BITS == 0
+
 mp_limb_t
-#if __STDC__
-mpn_sub_n (mp_ptr res_ptr, mp_srcptr s1_ptr, mp_srcptr s2_ptr, mp_size_t size)
-#else
-mpn_sub_n (res_ptr, s1_ptr, s2_ptr, size)
-     register mp_ptr res_ptr;
-     register mp_srcptr s1_ptr;
-     register mp_srcptr s2_ptr;
-     mp_size_t size;
-#endif
+mpn_sub_n (mp_ptr rp, mp_srcptr up, mp_srcptr vp, mp_size_t n)
 {
-  register mp_limb_t x, y, cy;
-  register mp_size_t j;
+  mp_limb_t ul, vl, sl, rl, cy, cy1, cy2;
 
-  /* The loop counter and index J goes from -SIZE to -1.  This way
-     the loop becomes faster.  */
-  j = -size;
+  ASSERT (n >= 1);
+  ASSERT (MPN_SAME_OR_SEPARATE_P (rp, up, n));
+  ASSERT (MPN_SAME_OR_SEPARATE_P (rp, vp, n));
 
-  /* Offset the base pointers to compensate for the negative indices.  */
-  s1_ptr -= j;
-  s2_ptr -= j;
-  res_ptr -= j;
+  cy = 0;
+  do
+    {
+      ul = *up++;
+      vl = *vp++;
+      sl = ul - vl;
+      cy1 = sl > ul;
+      rl = sl - cy;
+      cy2 = rl > sl;
+      cy = cy1 | cy2;
+      *rp++ = rl;
+    }
+  while (--n != 0);
 
+  return cy;
+}
+
+#endif
+
+#if GMP_NAIL_BITS >= 1
+
+mp_limb_t
+mpn_sub_n (mp_ptr rp, mp_srcptr up, mp_srcptr vp, mp_size_t n)
+{
+  mp_limb_t ul, vl, rl, cy;
+
+  ASSERT (n >= 1);
+  ASSERT (MPN_SAME_OR_SEPARATE_P (rp, up, n));
+  ASSERT (MPN_SAME_OR_SEPARATE_P (rp, vp, n));
+
   cy = 0;
   do
     {
-      y = s2_ptr[j];
-      x = s1_ptr[j];
-      y += cy;			/* add previous carry to subtrahend */
-      cy = (y < cy);		/* get out carry from that addition */
-      y = x - y;		/* main subtract */
-      cy = (y > x) + cy;	/* get out carry from the subtract, combine */
-      res_ptr[j] = y;
+      ul = *up++;
+      vl = *vp++;
+      rl = ul - vl - cy;
+      cy = rl >> (GMP_LIMB_BITS - 1);
+      *rp++ = rl & GMP_NUMB_MASK;
     }
-  while (++j != 0);
+  while (--n != 0);
 
   return cy;
 }
+
+#endif