Imported gcc-4.4.3

[msp430-gcc.git] / gmp / tests / mpf / t-get_d.c

diff --git a/gmp/tests/mpf/t-get_d.c b/gmp/tests/mpf/t-get_d.c
new file mode 100644 (file)
index 0000000..644657b
--- /dev/null
+++ b/gmp/tests/mpf/t-get_d.c
@@ -0,0 +1,74 @@
+/* Test mpf_get_d and mpf_set_d.
+
+   Copyright 1996, 1999, 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 <stdio.h>
+#include <stdlib.h>
+#include "gmp.h"
+#include "tests.h"
+
+#if defined (__vax__)
+#define LOW_BOUND 1e-38
+#define HIGH_BOUND 8e37
+#endif
+
+#if defined (_CRAY) && ! defined (_CRAYIEEE)
+/* The range varies mysteriously between Cray version.  On an SV1,
+   the range seem to be 1e-600..1e603, but a cfp (non-ieee) T90
+   has a much smaller range of 1e-240..1e240.  */
+#define LOW_BOUND 1e-240
+#define HIGH_BOUND 1e240
+#endif
+
+#if ! defined (LOW_BOUND)
+#define LOW_BOUND 1e-300
+#define HIGH_BOUND 1e300
+#endif
+
+int
+main (int argc, char **argv)
+{
+  double d, e, r;
+  mpf_t u, v;
+
+  tests_start ();
+  mpf_init (u);
+  mpf_init (v);
+
+  mpf_set_d (u, LOW_BOUND);
+  for (d = 2.0 * LOW_BOUND; d < HIGH_BOUND; d *= 1.01)
+    {
+      mpf_set_d (v, d);
+      if (mpf_cmp (u, v) >= 0)
+       abort ();
+      e = mpf_get_d (v);
+      r = e/d;
+      if (r < 0.99999999999999 || r > 1.00000000000001)
+       {
+         fprintf (stderr, "should be one ulp from 1: %.16f\n", r);
+         abort ();
+       }
+      mpf_set (u, v);
+    }
+
+  mpf_clear (u);
+  mpf_clear (v);
+
+  tests_end ();
+  exit (0);
+}