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diff --git a/gmp/mpz/set_si.c b/gmp/mpz/set_si.c
new file mode 100644
index 00000000..7c73047e
--- /dev/null
+++ b/gmp/mpz/set_si.c
@@ -0,0 +1,45 @@
+/* mpz_set_si(dest,val) -- Assign DEST with a small value VAL.
+
+Copyright 1991, 1993, 1994, 1995, 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"
+
+void
+mpz_set_si (mpz_ptr dest, signed long int val)
+{
+  mp_size_t size;
+  mp_limb_t vl;
+
+  vl = (mp_limb_t) (unsigned long int) (val >= 0 ? val : -val);
+
+  dest->_mp_d[0] = vl & GMP_NUMB_MASK;
+  size = vl != 0;
+
+#if GMP_NAIL_BITS != 0
+  if (vl > GMP_NUMB_MAX)
+    {
+      MPZ_REALLOC (dest, 2);
+      dest->_mp_d[1] = vl >> GMP_NUMB_BITS;
+      size = 2;
+    }
+#endif
+
+  dest->_mp_size = val >= 0 ? size : -size;
+}