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diff --git a/gmp/demos/expr/exprfa.c b/gmp/demos/expr/exprfa.c
new file mode 100644
index 00000000..1cc00e0f
--- /dev/null
+++ b/gmp/demos/expr/exprfa.c
@@ -0,0 +1,180 @@
+/* mpf expression evaluation
+
+Copyright 2000, 2001, 2002, 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/.  */
+
+
+/* Future: Bitwise "&", "|" and "&" could be done, if desired.  Not sure
+   those functions would be much value though.  */
+
+
+#include <ctype.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "gmp.h"
+#include "expr-impl.h"
+
+
+/* Change this to "#define TRACE(x) x" to get some traces. */
+#define TRACE(x)
+
+
+static size_t
+e_mpf_number (mpf_ptr res, __gmp_const char *e, size_t elen, int base)
+{
+  char    *edup;
+  size_t  i, ret, extra=0;
+  int     mant_base, exp_base;
+  void    *(*allocate_func) (size_t);
+  void    (*free_func) (void *, size_t);
+
+  TRACE (printf ("mpf_number base=%d \"%.*s\"\n", base, (int) elen, e));
+
+  /* mpf_set_str doesn't currently accept 0x for hex in base==0, so do it
+     here instead.  FIXME: Would prefer to let mpf_set_str handle this.  */
+  if (base == 0 && elen >= 2 && e[0] == '0' && (e[1] == 'x' || e[1] == 'X'))
+    {
+      base = 16;
+      extra = 2;
+      e += extra;
+      elen -= extra;
+    }
+
+  if (base == 0)
+    mant_base = 10;
+  else if (base < 0)
+    mant_base = -base;
+  else
+    mant_base = base;
+
+  /* exponent in decimal if base is negative */
+  if (base < 0)
+    exp_base = 10;
+  else if (base == 0)
+    exp_base = 10;
+  else
+    exp_base = base;
+
+#define IS_EXPONENT(c) \
+  (c == '@' || (base <= 10 && base >= -10 && (e[i] == 'e' || e[i] == 'E')))
+
+  i = 0;
+  for (;;)
+    {
+      if (i >= elen)
+        goto parsed;
+      if (e[i] == '.')
+        break;
+      if (IS_EXPONENT (e[i]))
+        goto exponent;
+      if (! isasciidigit_in_base (e[i], mant_base))
+        goto parsed;
+      i++;
+    }
+
+  /* fraction */
+  i++;
+  for (;;)
+    {
+      if (i >= elen)
+        goto parsed;
+      if (IS_EXPONENT (e[i]))
+        goto exponent;
+      if (! isasciidigit_in_base (e[i], mant_base))
+        goto parsed;
+      i++;
+    }
+
+ exponent:
+  i++;
+  if (i >= elen)
+    goto parsed;
+  if (e[i] == '-')
+    i++;
+  for (;;)
+    {
+      if (i >= elen)
+        goto parsed;
+      if (! isasciidigit_in_base (e[i], exp_base))
+        break;
+      i++;
+    }
+
+ parsed:
+  TRACE (printf ("  parsed i=%u \"%.*s\"\n", i, (int) i, e));
+
+  mp_get_memory_functions (&allocate_func, NULL, &free_func);
+  edup = (*allocate_func) (i+1);
+  memcpy (edup, e, i);
+  edup[i] = '\0';
+
+  if (mpf_set_str (res, edup, base) == 0)
+    ret = i + extra;
+  else
+    ret = 0;
+
+  (*free_func) (edup, i+1);
+  return ret;
+}
+
+static int
+e_mpf_ulong_p (mpf_srcptr f)
+{
+  return mpf_integer_p (f) && mpf_fits_ulong_p (f);
+}
+
+/* Don't want to change the precision of w, can only do an actual swap when
+   w and x have the same precision.  */
+static void
+e_mpf_set_or_swap (mpf_ptr w, mpf_ptr x)
+{
+  if (mpf_get_prec (w) == mpf_get_prec (x))
+    mpf_swap (w, x);
+  else
+    mpf_set (w, x);
+}
+
+
+int
+mpf_expr_a (__gmp_const struct mpexpr_operator_t *table,
+            mpf_ptr res, int base, unsigned long prec,
+            __gmp_const char *e, size_t elen,
+            mpf_srcptr var[26])
+{
+  struct mpexpr_parse_t  p;
+
+  p.table = table;
+  p.res = (mpX_ptr) res;
+  p.base = base;
+  p.prec = prec;
+  p.e = e;
+  p.elen = elen;
+  p.var = (mpX_srcptr *) var;
+
+  p.mpX_clear       = (mpexpr_fun_one_t)      mpf_clear;
+  p.mpX_ulong_p     = (mpexpr_fun_i_unary_t)  e_mpf_ulong_p;
+  p.mpX_get_ui      = (mpexpr_fun_get_ui_t)   mpf_get_ui;
+  p.mpX_init        = (mpexpr_fun_unary_ui_t) mpf_init2;
+  p.mpX_number      = (mpexpr_fun_number_t)   e_mpf_number;
+  p.mpX_set         = (mpexpr_fun_unary_t)    mpf_set;
+  p.mpX_set_or_swap = (mpexpr_fun_unary_t)    e_mpf_set_or_swap;
+  p.mpX_set_si      = (mpexpr_fun_set_si_t)   mpf_set_si;
+  p.mpX_swap        = (mpexpr_fun_swap_t)     mpf_swap;
+
+  return mpexpr_evaluate (&p);
+}