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diff --git a/gmp/mpf/swap.c b/gmp/mpf/swap.c
new file mode 100644
index 00000000..61c99f5c
--- /dev/null
+++ b/gmp/mpf/swap.c
@@ -0,0 +1,50 @@
+/* mpf_swap (U, V) -- Swap U and V.
+
+Copyright 1997, 1998, 2000, 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
+mpf_swap (mpf_ptr u, mpf_ptr v)
+{
+  mp_ptr up, vp;
+  mp_size_t usize, vsize;
+  mp_size_t uprec, vprec;
+  mp_exp_t  uexp, vexp;
+
+  uprec = u->_mp_prec;
+  vprec = v->_mp_prec;
+  v->_mp_prec = uprec;
+  u->_mp_prec = vprec;
+
+  usize = u->_mp_size;
+  vsize = v->_mp_size;
+  v->_mp_size = usize;
+  u->_mp_size = vsize;
+
+  uexp = u->_mp_exp;
+  vexp = v->_mp_exp;
+  v->_mp_exp = uexp;
+  u->_mp_exp = vexp;
+
+  up = u->_mp_d;
+  vp = v->_mp_d;
+  v->_mp_d = up;
+  u->_mp_d = vp;
+}