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diff --git a/gmp/mpz/set_f.c b/gmp/mpz/set_f.c
new file mode 100644
index 00000000..b939b662
--- /dev/null
+++ b/gmp/mpz/set_f.c
@@ -0,0 +1,62 @@
+/* mpz_set_f (dest_integer, src_float) -- Assign DEST_INTEGER from SRC_FLOAT.
+
+Copyright 1996, 2001 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
+mpz_set_f (mpz_ptr w, mpf_srcptr u)
+{
+  mp_ptr    wp, up;
+  mp_size_t size;
+  mp_exp_t  exp;
+
+  /* abs(u)<1 truncates to zero */
+  exp = EXP (u);
+  if (exp <= 0)
+    {
+      SIZ(w) = 0;
+      return;
+    }
+
+  MPZ_REALLOC (w, exp);
+  wp = PTR(w);
+  up = PTR(u);
+
+  size = SIZ (u);
+  SIZ(w) = (size >= 0 ? exp : -exp);
+  size = ABS (size);
+
+  if (exp > size)
+    {
+      /* pad with low zeros to get a total "exp" many limbs */
+      mp_size_t  zeros = exp - size;
+      MPN_ZERO (wp, zeros);
+      wp += zeros;
+    }
+  else
+    {
+      /* exp<=size, trucate to the high "exp" many limbs */
+      up += (size - exp);
+      size = exp;
+    }
+
+  MPN_COPY (wp, up, size);
+}