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diff --git a/gmp/mpz/cmp_si.c b/gmp/mpz/cmp_si.c
new file mode 100644
index 00000000..f53932e1
--- /dev/null
+++ b/gmp/mpz/cmp_si.c
@@ -0,0 +1,66 @@
+/* mpz_cmp_si(u,v) -- Compare an integer U with a single-word int V.
+   Return positive, zero, or negative based on if U > V, U == V, or U < V.
+
+Copyright 1991, 1993, 1994, 1995, 1996, 2000, 2001, 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"
+
+int
+_mpz_cmp_si (mpz_srcptr u, signed long int v_digit)
+{
+  mp_size_t usize = u->_mp_size;
+  mp_size_t vsize;
+  mp_limb_t u_digit;
+
+#if GMP_NAIL_BITS != 0
+  /* FIXME.  This isn't very pretty.  */
+  mpz_t tmp;
+  mp_limb_t tt[2];
+  PTR(tmp) = tt;
+  ALLOC(tmp) = 2;
+  mpz_set_si (tmp, v_digit);
+  return mpz_cmp (u, tmp);
+#endif
+
+  vsize = 0;
+  if (v_digit > 0)
+    vsize = 1;
+  else if (v_digit < 0)
+    {
+      vsize = -1;
+      v_digit = -v_digit;
+    }
+
+  if (usize != vsize)
+    return usize - vsize;
+
+  if (usize == 0)
+    return 0;
+
+  u_digit = u->_mp_d[0];
+
+  if (u_digit == (mp_limb_t) (unsigned long) v_digit)
+    return 0;
+
+  if (u_digit > (mp_limb_t) (unsigned long) v_digit)
+    return usize;
+  else
+    return -usize;
+}