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diff --git a/gmp/mpn/generic/addmul_1.c b/gmp/mpn/generic/addmul_1.c
new file mode 100644
index 00000000..861e1bc8
--- /dev/null
+++ b/gmp/mpn/generic/addmul_1.c
@@ -0,0 +1,129 @@
+/* mpn_addmul_1 -- multiply the N long limb vector pointed to by UP by VL,
+   add the N least significant limbs of the product to the limb vector
+   pointed to by RP.  Return the most significant limb of the product,
+   adjusted for carry-out from the addition.
+
+Copyright 1992, 1993, 1994, 1996, 2000, 2002, 2004 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"
+#include "longlong.h"
+
+
+#if GMP_NAIL_BITS == 0
+
+mp_limb_t
+mpn_addmul_1 (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_limb_t vl)
+{
+  mp_limb_t ul, cl, hpl, lpl, rl;
+
+  ASSERT (n >= 1);
+  ASSERT (MPN_SAME_OR_SEPARATE_P (rp, up, n));
+
+  cl = 0;
+  do
+    {
+      ul = *up++;
+      umul_ppmm (hpl, lpl, ul, vl);
+
+      lpl += cl;
+      cl = (lpl < cl) + hpl;
+
+      rl = *rp;
+      lpl = rl + lpl;
+      cl += lpl < rl;
+      *rp++ = lpl;
+    }
+  while (--n != 0);
+
+  return cl;
+}
+
+#endif
+
+#if GMP_NAIL_BITS == 1
+
+mp_limb_t
+mpn_addmul_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, cl, xl, c1, c2, c3;
+
+  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;
+      ADDC_LIMB (c1, xl, prev_hpl, lpl);
+      ADDC_LIMB (c2, xl, xl, rl);
+      ADDC_LIMB (c3, xl, xl, cl);
+      cl = c1 + c2 + c3;
+      *rp++ = xl;
+      prev_hpl = hpl;
+    }
+  while (--n != 0);
+
+  return prev_hpl + cl;
+}
+
+#endif
+
+#if GMP_NAIL_BITS >= 2
+
+mp_limb_t
+mpn_addmul_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 = prev_hpl + lpl + rl + cl;
+      cl = xw >> GMP_NUMB_BITS;
+      xl = xw & GMP_NUMB_MASK;
+      *rp++ = xl;
+      prev_hpl = hpl;
+    }
+  while (--n != 0);
+
+  return prev_hpl + cl;
+}
+
+#endif