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diff --git a/mpfr/mul_ui.c b/mpfr/mul_ui.c
new file mode 100644
index 00000000..96305c4f
--- /dev/null
+++ b/mpfr/mul_ui.c
@@ -0,0 +1,133 @@
+/* mpfr_mul_ui -- multiply a floating-point number by a machine integer
+   mpfr_mul_si -- multiply a floating-point number by a machine integer
+
+Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR 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 2.1 of the License, or (at your
+option) any later version.
+
+The GNU MPFR 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 MPFR Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+MA 02110-1301, USA. */
+
+#define MPFR_NEED_LONGLONG_H
+#include "mpfr-impl.h"
+
+int
+mpfr_mul_ui (mpfr_ptr y, mpfr_srcptr x, unsigned long int u, mp_rnd_t rnd_mode)
+{
+  mp_limb_t *yp;
+  mp_size_t xn;
+  int cnt, inexact;
+  MPFR_TMP_DECL (marker);
+
+  if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (x)))
+    {
+      if (MPFR_IS_NAN (x))
+        {
+          MPFR_SET_NAN (y);
+          MPFR_RET_NAN;
+        }
+      else if (MPFR_IS_INF (x))
+        {
+          if (u != 0)
+            {
+              MPFR_SET_INF (y);
+              MPFR_SET_SAME_SIGN (y, x);
+              MPFR_RET (0); /* infinity is exact */
+            }
+          else /* 0 * infinity */
+            {
+              MPFR_SET_NAN (y);
+              MPFR_RET_NAN;
+            }
+        }
+      else /* x is zero */
+        {
+          MPFR_ASSERTD (MPFR_IS_ZERO (x));
+          MPFR_SET_ZERO (y);
+          MPFR_SET_SAME_SIGN (y, x);
+          MPFR_RET (0); /* zero is exact */
+        }
+    }
+  else if (MPFR_UNLIKELY (u <= 1))
+    {
+      if (u < 1)
+        {
+          MPFR_SET_ZERO (y);
+          MPFR_SET_SAME_SIGN (y, x);
+          MPFR_RET (0); /* zero is exact */
+        }
+      else
+        return mpfr_set (y, x, rnd_mode);
+    }
+  else if (MPFR_UNLIKELY (IS_POW2 (u)))
+    return mpfr_mul_2si (y, x, MPFR_INT_CEIL_LOG2 (u), rnd_mode);
+
+  yp = MPFR_MANT (y);
+  xn = MPFR_LIMB_SIZE (x);
+
+  MPFR_ASSERTD (xn < MP_SIZE_T_MAX);
+  MPFR_TMP_MARK(marker);
+  yp = (mp_ptr) MPFR_TMP_ALLOC ((size_t) (xn + 1) * BYTES_PER_MP_LIMB);
+
+  MPFR_ASSERTN (u == (mp_limb_t) u);
+  yp[xn] = mpn_mul_1 (yp, MPFR_MANT (x), xn, u);
+
+  /* x * u is stored in yp[xn], ..., yp[0] */
+
+  /* since the case u=1 was treated above, we have u >= 2, thus
+     yp[xn] >= 1 since x was msb-normalized */
+  MPFR_ASSERTD (yp[xn] != 0);
+  if (MPFR_LIKELY (MPFR_LIMB_MSB (yp[xn]) == 0))
+    {
+      count_leading_zeros (cnt, yp[xn]);
+      mpn_lshift (yp, yp, xn + 1, cnt);
+    }
+  else
+    {
+      cnt = 0;
+    }
+
+  /* now yp[xn], ..., yp[0] is msb-normalized too, and has at most
+     PREC(x) + (BITS_PER_MP_LIMB - cnt) non-zero bits */
+  MPFR_RNDRAW (inexact, y, yp, (mp_prec_t) (xn + 1) * BITS_PER_MP_LIMB,
+               rnd_mode, MPFR_SIGN (x), cnt -- );
+
+  MPFR_TMP_FREE (marker);
+
+  cnt = BITS_PER_MP_LIMB - cnt;
+  if (MPFR_UNLIKELY (__gmpfr_emax < MPFR_EMAX_MIN + cnt
+                     || MPFR_GET_EXP (x) > __gmpfr_emax - cnt))
+    return mpfr_overflow (y, rnd_mode, MPFR_SIGN(x));
+
+  MPFR_SET_EXP (y, MPFR_GET_EXP (x) + cnt);
+  MPFR_SET_SAME_SIGN (y, x);
+
+  return inexact;
+}
+
+int mpfr_mul_si (mpfr_ptr y, mpfr_srcptr x, long int u, mp_rnd_t rnd_mode)
+{
+  int res;
+
+  if (u >= 0)
+    res = mpfr_mul_ui (y, x, u, rnd_mode);
+  else
+    {
+      res = -mpfr_mul_ui (y, x, -u, MPFR_INVERT_RND (rnd_mode));
+      MPFR_CHANGE_SIGN (y);
+    }
+  return res;
+}