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diff --git a/gmp/mpn/generic/toom44_mul.c b/gmp/mpn/generic/toom44_mul.c
new file mode 100644
index 00000000..318e55a9
--- /dev/null
+++ b/gmp/mpn/generic/toom44_mul.c
@@ -0,0 +1,331 @@
+/* mpn_toom44_mul -- Multiply {ap,an} and {bp,bn} where an and bn are close in
+   size.  Or more accurately, bn <= an < (4/3)bn.
+
+   Contributed to the GNU project by Torbjorn Granlund and Marco Bodrato.
+
+   THE FUNCTION IN THIS FILE IS INTERNAL WITH A MUTABLE INTERFACE.  IT IS ONLY
+   SAFE TO REACH IT THROUGH DOCUMENTED INTERFACES.  IN FACT, IT IS ALMOST
+   GUARANTEED THAT IT WILL CHANGE OR DISAPPEAR IN A FUTURE GNU MP RELEASE.
+
+Copyright 2006, 2007, 2008 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/.  */
+
+
+/*
+  Things to work on:
+
+  1. Trim allocation.  The allocations for as1, asm1, bs1, and bsm1 could be
+     avoided by instead reusing the pp area and the scratch area.
+  2. Use new toom functions for the recursive calls.
+*/
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+/* Evaluate in: -1, -1/2, 0, +1/2, +1, +2, +inf
+
+  <-s--><--n--><--n--><--n-->
+   ____ ______ ______ ______
+  |_a3_|___a2_|___a1_|___a0_|
+   |b3_|___b2_|___b1_|___b0_|
+   <-t-><--n--><--n--><--n-->
+
+  v0  =   a0             *  b0              #    A(0)*B(0)
+  v1  = ( a0+ a1+ a2+ a3)*( b0+ b1+ b2+ b3) #    A(1)*B(1)      ah  <= 3   bh  <= 3
+  vm1 = ( a0- a1+ a2- a3)*( b0- b1+ b2- b3) #   A(-1)*B(-1)    |ah| <= 1  |bh| <= 1
+  v2  = ( a0+2a1+4a2+8a3)*( b0+2b1+4b2+8b3) #    A(2)*B(2)      ah  <= 14  bh  <= 14
+  vh  = (8a0+4a1+2a2+ a3)*(8b0+4b1+2b2+ b3) #  A(1/2)*B(1/2)    ah  <= 14  bh  <= 14
+  vmh = (8a0-4a1+2a2- a3)*(8b0-4b1+2b2- b3) # A(-1/2)*B(-1/2)  -4<=ah<=9  -4<=bh<=9
+  vinf=               a3 *          b2      #  A(inf)*B(inf)
+*/
+
+#if TUNE_PROGRAM_BUILD
+#define MAYBE_mul_basecase 1
+#define MAYBE_mul_toom22   1
+#define MAYBE_mul_toom44   1
+#else
+#define MAYBE_mul_basecase						\
+  (MUL_TOOM44_THRESHOLD < 4 * MUL_KARATSUBA_THRESHOLD)
+#define MAYBE_mul_toom22						\
+  (MUL_TOOM44_THRESHOLD < 4 * MUL_TOOM33_THRESHOLD)
+#define MAYBE_mul_toom44						\
+  (MUL_FFT_THRESHOLD >= 4 * MUL_TOOM44_THRESHOLD)
+#endif
+
+#define TOOM44_MUL_N_REC(p, a, b, n, ws)				\
+  do {									\
+    if (MAYBE_mul_basecase						\
+	&& BELOW_THRESHOLD (n, MUL_KARATSUBA_THRESHOLD))		\
+      mpn_mul_basecase (p, a, n, b, n);					\
+    else if (MAYBE_mul_toom22						\
+	     && BELOW_THRESHOLD (n, MUL_TOOM33_THRESHOLD))		\
+      mpn_kara_mul_n (p, a, b, n, ws);					\
+    else if (! MAYBE_mul_toom44						\
+	     || BELOW_THRESHOLD (n, MUL_TOOM44_THRESHOLD))		\
+      mpn_toom3_mul_n (p, a, b, n, ws);					\
+    else								\
+      mpn_toom44_mul (p, a, n, b, n, ws);				\
+  } while (0)
+
+void
+mpn_toom44_mul (mp_ptr pp,
+		mp_srcptr ap, mp_size_t an,
+		mp_srcptr bp, mp_size_t bn,
+		mp_ptr scratch)
+{
+  mp_size_t n, s, t;
+  mp_limb_t cy;
+  mp_ptr gp, hp;
+  mp_ptr as1, asm1, as2, ash, asmh;
+  mp_ptr bs1, bsm1, bs2, bsh, bsmh;
+  enum toom4_flags flags;
+  TMP_DECL;
+
+#define a0  ap
+#define a1  (ap + n)
+#define a2  (ap + 2*n)
+#define a3  (ap + 3*n)
+#define b0  bp
+#define b1  (bp + n)
+#define b2  (bp + 2*n)
+#define b3  (bp + 3*n)
+
+  n = (an + 3) >> 2;
+
+  s = an - 3 * n;
+  t = bn - 3 * n;
+
+  ASSERT (an >= bn);
+
+  ASSERT (0 < s && s <= n);
+  ASSERT (0 < t && t <= n);
+
+  TMP_MARK;
+
+  as1  = TMP_SALLOC_LIMBS (n + 1);
+  asm1 = TMP_SALLOC_LIMBS (n + 1);
+  as2  = TMP_SALLOC_LIMBS (n + 1);
+  ash  = TMP_SALLOC_LIMBS (n + 1);
+  asmh = TMP_SALLOC_LIMBS (n + 1);
+
+  bs1  = TMP_SALLOC_LIMBS (n + 1);
+  bsm1 = TMP_SALLOC_LIMBS (n + 1);
+  bs2  = TMP_SALLOC_LIMBS (n + 1);
+  bsh  = TMP_SALLOC_LIMBS (n + 1);
+  bsmh = TMP_SALLOC_LIMBS (n + 1);
+
+  gp = pp;
+  hp = pp + n + 1;
+
+  flags = 0;
+
+  /* Compute as1 and asm1.  */
+  gp[n]  = mpn_add_n (gp, a0, a2, n);
+  hp[n]  = mpn_add (hp, a1, n, a3, s);
+#if HAVE_NATIVE_mpn_addsub_n
+  if (mpn_cmp (gp, hp, n + 1) < 0)
+    {
+      mpn_addsub_n (as1, asm1, hp, gp, n + 1);
+      flags ^= toom4_w3_neg;
+    }
+  else
+    {
+      mpn_addsub_n (as1, asm1, gp, hp, n + 1);
+    }
+#else
+  mpn_add_n (as1, gp, hp, n + 1);
+  if (mpn_cmp (gp, hp, n + 1) < 0)
+    {
+      mpn_sub_n (asm1, hp, gp, n + 1);
+      flags ^= toom4_w3_neg;
+    }
+  else
+    {
+      mpn_sub_n (asm1, gp, hp, n + 1);
+    }
+#endif
+
+  /* Compute as2.  */
+#if HAVE_NATIVE_mpn_addlsh1_n
+  cy  = mpn_addlsh1_n (as2, a2, a3, s);
+  if (s != n)
+    cy = mpn_add_1 (as2 + s, a2 + s, n - s, cy);
+  cy = 2 * cy + mpn_addlsh1_n (as2, a1, as2, n);
+  cy = 2 * cy + mpn_addlsh1_n (as2, a0, as2, n);
+#else
+  cy  = mpn_lshift (as2, a3, s, 1);
+  cy += mpn_add_n (as2, a2, as2, s);
+  if (s != n)
+    cy = mpn_add_1 (as2 + s, a2 + s, n - s, cy);
+  cy = 2 * cy + mpn_lshift (as2, as2, n, 1);
+  cy += mpn_add_n (as2, a1, as2, n);
+  cy = 2 * cy + mpn_lshift (as2, as2, n, 1);
+  cy += mpn_add_n (as2, a0, as2, n);
+#endif
+  as2[n] = cy;
+
+  /* Compute ash and asmh.  */
+  cy  = mpn_lshift (gp, a0, n, 3);			/*  8a0             */
+#if HAVE_NATIVE_mpn_addlsh1_n
+  gp[n] = cy + mpn_addlsh1_n (gp, gp, a2, n);		/*  8a0 + 2a2       */
+#else
+  cy += mpn_lshift (hp, a2, n, 1);			/*        2a2       */
+  gp[n] = cy + mpn_add_n (gp, gp, hp, n);		/*  8a0 + 2a2       */
+#endif
+  cy = mpn_lshift (hp, a1, n, 2);			/*  4a1             */
+  hp[n] = cy + mpn_add (hp, hp, n, a3, s);		/*  4a1 +  a3       */
+#if HAVE_NATIVE_mpn_addsub_n
+  if (mpn_cmp (gp, hp, n + 1) < 0)
+    {
+      mpn_addsub_n (ash, asmh, hp, gp, n + 1);
+      flags ^= toom4_w1_neg;
+    }
+  else
+    {
+      mpn_addsub_n (ash, asmh, gp, hp, n + 1);
+    }
+#else
+  mpn_add_n (ash, gp, hp, n + 1);
+  if (mpn_cmp (gp, hp, n + 1) < 0)
+    {
+      mpn_sub_n (asmh, hp, gp, n + 1);
+      flags ^= toom4_w1_neg;
+    }
+  else
+    {
+      mpn_sub_n (asmh, gp, hp, n + 1);
+    }
+#endif
+
+  /* Compute bs1 and bsm1.  */
+  gp[n]  = mpn_add_n (gp, b0, b2, n);
+  hp[n]  = mpn_add (hp, b1, n, b3, t);
+#if HAVE_NATIVE_mpn_addsub_n
+  if (mpn_cmp (gp, hp, n + 1) < 0)
+    {
+      mpn_addsub_n (bs1, bsm1, hp, gp, n + 1);
+      flags ^= toom4_w3_neg;
+    }
+  else
+    {
+      mpn_addsub_n (bs1, bsm1, gp, hp, n + 1);
+    }
+#else
+  mpn_add_n (bs1, gp, hp, n + 1);
+  if (mpn_cmp (gp, hp, n + 1) < 0)
+    {
+      mpn_sub_n (bsm1, hp, gp, n + 1);
+      flags ^= toom4_w3_neg;
+    }
+  else
+    {
+      mpn_sub_n (bsm1, gp, hp, n + 1);
+    }
+#endif
+
+  /* Compute bs2.  */
+#if HAVE_NATIVE_mpn_addlsh1_n
+  cy  = mpn_addlsh1_n (bs2, b2, b3, t);
+  if (t != n)
+    cy = mpn_add_1 (bs2 + t, b2 + t, n - t, cy);
+  cy = 2 * cy + mpn_addlsh1_n (bs2, b1, bs2, n);
+  cy = 2 * cy + mpn_addlsh1_n (bs2, b0, bs2, n);
+#else
+  cy  = mpn_lshift (bs2, b3, t, 1);
+  cy += mpn_add_n (bs2, b2, bs2, t);
+  if (t != n)
+    cy = mpn_add_1 (bs2 + t, b2 + t, n - t, cy);
+  cy = 2 * cy + mpn_lshift (bs2, bs2, n, 1);
+  cy += mpn_add_n (bs2, b1, bs2, n);
+  cy = 2 * cy + mpn_lshift (bs2, bs2, n, 1);
+  cy += mpn_add_n (bs2, b0, bs2, n);
+#endif
+  bs2[n] = cy;
+
+  /* Compute bsh and bsmh.  */
+  cy  = mpn_lshift (gp, b0, n, 3);			/*  8b0             */
+#if HAVE_NATIVE_mpn_addlsh1_n
+  gp[n] = cy + mpn_addlsh1_n (gp, gp, b2, n);		/*  8b0 + 2b2       */
+#else
+  cy += mpn_lshift (hp, b2, n, 1);			/*        2b2       */
+  gp[n] = cy + mpn_add_n (gp, gp, hp, n);		/*  8b0 + 2b2       */
+#endif
+  cy = mpn_lshift (hp, b1, n, 2);			/*  4b1             */
+  hp[n] = cy + mpn_add (hp, hp, n, b3, t);		/*  4b1 +  b3       */
+#if HAVE_NATIVE_mpn_addsub_n
+  if (mpn_cmp (gp, hp, n + 1) < 0)
+    {
+      mpn_addsub_n (bsh, bsmh, hp, gp, n + 1);
+      flags ^= toom4_w1_neg;
+    }
+  else
+    {
+      mpn_addsub_n (bsh, bsmh, gp, hp, n + 1);
+    }
+#else
+  mpn_add_n (bsh, gp, hp, n + 1);
+  if (mpn_cmp (gp, hp, n + 1) < 0)
+    {
+      mpn_sub_n (bsmh, hp, gp, n + 1);
+      flags ^= toom4_w1_neg;
+    }
+  else
+    {
+      mpn_sub_n (bsmh, gp, hp, n + 1);
+    }
+#endif
+
+  ASSERT (as1[n] <= 3);
+  ASSERT (bs1[n] <= 3);
+  ASSERT (asm1[n] <= 1);
+  ASSERT (bsm1[n] <= 1);
+  ASSERT (as2[n] <= 14);
+  ASSERT (bs2[n] <= 14);
+  ASSERT (ash[n] <= 14);
+  ASSERT (bsh[n] <= 14);
+  ASSERT (asmh[n] <= 9);
+  ASSERT (bsmh[n] <= 9);
+
+#define v0    pp				/* 2n */
+#define v1    (scratch + 6 * n + 6)		/* 2n+1 */
+#define vm1   scratch				/* 2n+1 */
+#define v2    (scratch + 2 * n + 2)		/* 2n+1 */
+#define vinf  (pp + 6 * n)			/* s+t */
+#define vh    (pp + 2 * n)			/* 2n+1 */
+#define vmh   (scratch + 4 * n + 4)
+#define scratch_out  (scratch + 8 * n + 8)
+
+  /* vm1, 2n+1 limbs */
+  TOOM44_MUL_N_REC (vm1, asm1, bsm1, n + 1, scratch_out);	/* vm1, 2n+1 limbs */
+
+  TOOM44_MUL_N_REC (v2 , as2 , bs2 , n + 1, scratch_out);	/* v2,  2n+1 limbs */
+
+  if (s > t)  mpn_mul (vinf, a3, s, b3, t);
+  else   TOOM44_MUL_N_REC (vinf, a3, b3, s, scratch_out);	/* vinf, s+t limbs */
+
+  TOOM44_MUL_N_REC (v1 , as1 , bs1 , n + 1, scratch_out);	/* v1,  2n+1 limbs */
+
+  TOOM44_MUL_N_REC (vh , ash , bsh , n + 1, scratch_out);
+
+  TOOM44_MUL_N_REC (vmh, asmh, bsmh, n + 1, scratch_out);
+
+  TOOM44_MUL_N_REC (v0 , ap  , bp  , n    , scratch_out);	/* v0,  2n limbs */
+
+  mpn_toom_interpolate_7pts (pp, n, flags, vmh, vm1, v1, v2, s + t, scratch_out);
+
+  TMP_FREE;
+}