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diff --git a/gmp/mpf/set_z.c b/gmp/mpf/set_z.c
new file mode 100644
index 00000000..4b0f01be
--- /dev/null
+++ b/gmp/mpf/set_z.c
@@ -0,0 +1,46 @@
+/* mpf_set_z -- Assign a float from an integer.
+
+Copyright 1996, 2001, 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"
+
+void
+mpf_set_z (mpf_ptr r, mpz_srcptr u)
+{
+  mp_ptr rp, up;
+  mp_size_t size, asize;
+  mp_size_t prec;
+
+  prec = PREC (r) + 1;
+  size = SIZ (u);
+  asize = ABS (size);
+  rp = PTR (r);
+  up = PTR (u);
+
+  EXP (r) = asize;
+
+  if (asize > prec)
+    {
+      up += asize - prec;
+      asize = prec;
+    }
+
+  SIZ (r) = size >= 0 ? asize : -asize;
+  MPN_COPY (rp, up, asize);
+}