1 files changed, 123 insertions, 0 deletions
diff --git a/mpfr/tests/texceptions.c b/mpfr/tests/texceptions.c
new file mode 100644
index 000000000..6c2b1b7e2
--- /dev/null
+++ b/mpfr/tests/texceptions.c
@@ -0,0 +1,123 @@
+/* Test file for exceptions.
+
+Copyright (C) 2001 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 <mpfr.h>
+
+void mpfr_set_double_range _PROTO((void));
+
+void
+mpfr_set_double_range (void)
+{
+  mpfr_set_default_prec (53);
+  
+  /* in double precision format, the unbiased exponent is between 0 and
+     2047, where 0 is used for subnormal numbers, and 2047 for special
+     numbers (infinities, NaN), and the bias is 1023, thus "normal" numbers
+     have an exponent between -1022 and 1023, corresponding to numbers
+     between 2^(-1022) and previous(2^(1024)).
+     (The smallest subnormal number is 0.(0^51)1*2^(-1022)= 2^(-1074).)
+
+     The smallest normal power of two is 1.0*2^(-1022).
+     The largest normal power of two is 2^1023.
+     (We have to add one for mpfr since mantissa are between 1/2 and 1.)
+  */
+
+  mpfr_set_emin (-1021);
+  mpfr_set_emax (1024);
+}
+
+int
+main (int argc, char *argv[])
+{
+  mpfr_t x, y;
+  mp_exp_t emin, emax;
+
+  mpfr_init (x);
+  mpfr_init (y);
+
+  emin = mpfr_get_emin ();
+  emax = mpfr_get_emax ();
+  if (emin >= emax)
+    {
+      fprintf (stderr, "Error: emin >= emax\n");
+      exit (1);
+    }
+
+  mpfr_set_ui (x, 1, GMP_RNDN);
+  mpfr_mul_2exp (x, x, 1024, GMP_RNDN);
+  mpfr_set_double_range ();
+  mpfr_check_range (x, GMP_RNDN);
+  if (!mpfr_inf_p (x) || (mpfr_sgn(x) <= 0))
+    {
+      fprintf (stderr, "Error: 2^1024 rounded to nearest should give +Inf\n");
+      exit (1);
+    }
+
+  mpfr_set_emax (1025);
+  mpfr_set_ui (x, 1, GMP_RNDN);
+  mpfr_mul_2exp (x, x, 1024, GMP_RNDN);
+  mpfr_set_double_range ();
+  mpfr_check_range (x, GMP_RNDD);
+  if (!mpfr_number_p (x))
+    {
+      fprintf (stderr, "Error: 2^1024 rounded down should give a normal number\n");
+      exit (1);
+    }
+
+  mpfr_set_ui (x, 1, GMP_RNDN);
+  mpfr_mul_2exp (x, x, 1023, GMP_RNDN);
+  mpfr_add (x, x, x, GMP_RNDN);
+  if (!mpfr_inf_p (x) || (mpfr_sgn(x) <= 0))
+    {
+      fprintf (stderr, "Error: x+x rounded to nearest for x=2^1023 should give +Inf\n");
+      printf ("emax = %ld\n", mpfr_get_emax ());
+      printf ("got "); mpfr_print_raw (x); putchar ('\n');
+      exit (1);
+    }
+
+  mpfr_set_ui (x, 1, GMP_RNDN);
+  mpfr_mul_2exp (x, x, 1023, GMP_RNDN);
+  mpfr_add (x, x, x, GMP_RNDD);
+  if (!mpfr_number_p (x))
+    {
+      fprintf (stderr, "Error: x+x rounded down for x=2^1023 should give a normal number\n");
+      exit (1);
+    }
+
+  mpfr_set_ui (x, 1, GMP_RNDN);
+  mpfr_div_2exp (x, x, 1022, GMP_RNDN);
+  mpfr_set_str_raw (y, "1.1e-1022"); /* y = 3/2*x */
+  mpfr_sub (y, y, x, GMP_RNDZ);
+  if (mpfr_cmp_ui (y, 0))
+    {
+      fprintf (stderr, "Error: y-x rounded to zero should give 0 for y=3/2*2^(-1022), x=2^(-1022)\n");
+      printf ("y="); mpfr_print_raw (y); putchar ('\n');
+      exit (1);
+    }
+
+  mpfr_clear (x);
+  mpfr_clear (y);
+    
+  return 0;
+}