1 files changed, 101 insertions, 0 deletions
diff --git a/contrib/libgmp/mpf/tests/t-dm2exp.c b/contrib/libgmp/mpf/tests/t-dm2exp.c
new file mode 100644
index 000000000000..a8c4e8f519ed
--- /dev/null
+++ b/contrib/libgmp/mpf/tests/t-dm2exp.c
@@ -0,0 +1,101 @@
+/* Test mpf_div, mpf_div_2exp, mpf_mul_2exp.
+
+Copyright (C) 1996 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 Library General Public License as published by
+the Free Software Foundation; either version 2 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 Library General Public
+License for more details.
+
+You should have received a copy of the GNU Library 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 <stdio.h>
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "urandom.h"
+
+#ifndef SIZE
+#define SIZE 16
+#endif
+
+main (argc, argv)
+     int argc;
+     char **argv;
+{
+  int reps = 500000;
+  int i;
+  mpf_t u, v, w1, w2;
+  mp_size_t bprec = 100;
+  mpf_t rerr, limit_rerr;
+
+  if (argc > 1)
+    {
+      reps = strtol (argv[1], 0, 0);
+      if (argc > 2)
+	bprec = strtol (argv[2], 0, 0);
+    }
+
+  mpf_set_default_prec (bprec);
+
+  mpf_init (rerr);
+  mpf_init (limit_rerr);
+
+  mpf_init (u);
+  mpf_init (v);
+  mpf_init (w1);
+  mpf_init (w2);
+
+  for (i = 0; i < reps; i++)
+    {
+      mp_size_t res_prec;
+      unsigned long int pow2;
+
+      res_prec = urandom () % (bprec + 100);
+      mpf_set_prec (w1, res_prec);
+      mpf_set_prec (w2, res_prec);
+
+      mpf_set_ui (limit_rerr, 1);
+      mpf_div_2exp (limit_rerr, limit_rerr, res_prec);
+
+      pow2 = urandom () % 0x10000;
+      mpf_set_ui (v, 1);
+      mpf_mul_2exp (v, v, pow2);
+
+      mpf_div_2exp (w1, u, pow2);
+      mpf_div (w2, u, v);
+      mpf_reldiff (rerr, w1, w2);
+      if (mpf_cmp (rerr, limit_rerr) > 0)
+	{
+	  printf ("ERROR in mpf_div or mpf_div_2exp after %d tests\n", i);
+	  printf ("   u = "); mpf_dump (u);
+	  printf ("   v = "); mpf_dump (v);
+	  printf ("  w1 = "); mpf_dump (w1);
+	  printf ("  w2 = "); mpf_dump (w2);
+	  abort ();
+	}
+    }
+
+  exit (0);
+}
+
+oo (x)
+     mpf_t x;
+{
+  mp_size_t i;
+  printf (" exp = %ld\n", x->_mp_exp);
+  printf ("size = %d\n", x->_mp_size);
+  for (i = ABS (x->_mp_size) - 1; i >= 0; i--)
+    printf ("%08lX ", x->_mp_d[i]);
+  printf ("\n");
+  mpf_dump (x);
+}