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diff --git a/gmp/mpn/generic/sub_n.c b/gmp/mpn/generic/sub_n.c
new file mode 100644
index 00000000..d33668fa
--- /dev/null
+++ b/gmp/mpn/generic/sub_n.c
@@ -0,0 +1,79 @@
+/* mpn_sub_n -- Subtract equal length limb vectors.
+
+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 Lesser General Public License as published by
+the Free Software Foundation; either version 3 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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+
+#if GMP_NAIL_BITS == 0
+
+mp_limb_t
+mpn_sub_n (mp_ptr rp, mp_srcptr up, mp_srcptr vp, mp_size_t n)
+{
+  mp_limb_t ul, vl, sl, rl, cy, cy1, cy2;
+
+  ASSERT (n >= 1);
+  ASSERT (MPN_SAME_OR_SEPARATE_P (rp, up, n));
+  ASSERT (MPN_SAME_OR_SEPARATE_P (rp, vp, n));
+
+  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
+    {
+      ul = *up++;
+      vl = *vp++;
+      rl = ul - vl - cy;
+      cy = rl >> (GMP_LIMB_BITS - 1);
+      *rp++ = rl & GMP_NUMB_MASK;
+    }
+  while (--n != 0);
+
+  return cy;
+}
+
+#endif