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diff --git a/ghc/rts/gmp/mpz/swap.c b/ghc/rts/gmp/mpz/swap.c
new file mode 100644
index 0000000..0070d6f
--- /dev/null
+++ b/ghc/rts/gmp/mpz/swap.c
@@ -0,0 +1,52 @@
+/* mpz_swap (dest_integer, src_integer) -- Swap U and V.
+
+Copyright (C) 1997, 1998 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 2.1 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; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+void
+#if __STDC__
+mpz_swap (mpz_ptr u, mpz_ptr v)
+#else
+mpz_swap (u, v)
+     mpz_ptr u;
+     mpz_ptr v;
+#endif
+{
+  mp_ptr up, vp;
+  mp_size_t usize, vsize;
+  mp_size_t ualloc, valloc;
+
+  ualloc = u->_mp_alloc;
+  valloc = v->_mp_alloc;
+  v->_mp_alloc = ualloc;
+  u->_mp_alloc = valloc;
+
+  usize = u->_mp_size;
+  vsize = v->_mp_size;
+  v->_mp_size = usize;
+  u->_mp_size = vsize;
+
+  up = u->_mp_d;
+  vp = v->_mp_d;
+  v->_mp_d = up;
+  u->_mp_d = vp;
+}