Added generic tests for mpfr_nextabove and mpfr_nextbelow.

Fixed a bug in next.c related to assertion checks.


git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@2444 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 84 insertions, 0 deletions

diff --git a/tests/tnext.c b/tests/tnext.c
new file mode 100644
index 000000000..574a84676
--- /dev/null
+++ b/tests/tnext.c
@@ -0,0 +1,84 @@
+/* Test file for mpfr_nextabove, mpfr_nextbelow, mpfr_nexttoward.
+
+Copyright 2003 Free Software Foundation.
+
+This file is part of the MPFR Library.
+
+The MPFR 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 MPFR 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 MPFR 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 <stdlib.h>
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "mpfr.h"
+#include "mpfr-impl.h"
+#include "mpfr-test.h"
+
+/* Generic tests for mpfr_nextabove and mpfr_nextbelow */
+static void
+generic_abovebelow (void)
+{
+  int i;
+
+  for (i = 0; i < 20000; i++)
+    {
+      mpfr_t x, y, z, t;
+      mp_prec_t prec;
+      int neg, below;
+
+      prec = (randlimb () % 300) + MPFR_PREC_MIN;
+      mpfr_inits2 (prec, x, y, z, (void *) 0);
+      mpfr_init2 (t, 3);
+      do
+        mpfr_random (x);
+      while (mpfr_cmp_ui (x, 0) == 0);
+      neg = randlimb () & 1;
+      if (neg)
+        mpfr_neg (x, x, GMP_RNDN);
+      mpfr_set (y, x, GMP_RNDN);
+      below = randlimb () & 1;
+      if (below)
+        mpfr_nextbelow (y);
+      else
+        mpfr_nextabove (y);
+      mpfr_set_si (t, below ? -5 : 5, GMP_RNDN);
+      mpfr_mul_2si (t, t, mpfr_get_exp (x) - prec - 3, GMP_RNDN);
+      /* t = (1/2 + 1/8) ulp(x) */
+      mpfr_add (z, x, t, GMP_RNDN);
+      if (!mpfr_number_p (y) || mpfr_cmp (y, z) != 0)
+        {
+          printf ("Error in mpfr_next%s for\n",
+                  below ? "below" : "above");
+          mpfr_out_str (stdout, 2, 0, x, GMP_RNDN);
+          printf (", got\n");
+          mpfr_out_str (stdout, 2, 0, y, GMP_RNDN);
+          printf (" instead of\n");
+          mpfr_out_str (stdout, 2, 0, z, GMP_RNDN);
+          printf ("\n");
+          exit (1);
+        }
+      mpfr_clears (x, y, z, t, (void *) 0);
+    }
+}
+
+int
+main (void)
+{
+  tests_start_mpfr ();
+  generic_abovebelow ();
+  tests_end_mpfr ();
+  return 0;
+}