Fix overflow and add corresponding tests.

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@2908 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/texp2.c b/tests/texp2.c
index f705b5f48..e304f85d6 100644
--- a/tests/texp2.c
+++ b/tests/texp2.c
@@ -28,6 +28,32 @@ MA 02111-1307, USA. */
 #define TEST_FUNCTION mpfr_exp2
 #include "tgeneric.c"
 
+static void
+special_overflow (void)
+{
+  mpfr_t x, y;
+
+  mpfr_set_emin (-125);
+  mpfr_set_emax (128);
+
+  mpfr_init2 (x, 24);
+  mpfr_init2 (y, 24);
+
+  mpfr_set_str_binary (x, "0.101100100000000000110100E15");
+  mpfr_exp2 (y, x, GMP_RNDN);
+  if (!mpfr_inf_p(y))
+    {
+      printf("Overflow error.\n");
+      mpfr_dump (y);
+      exit (1);
+    }
+
+  mpfr_clear (y);
+  mpfr_clear (x);
+  mpfr_set_emin (MPFR_EMIN_MIN);
+  mpfr_set_emax (MPFR_EMAX_MAX);
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -36,6 +62,8 @@ main (int argc, char *argv[])
 
   tests_start_mpfr ();
 
+  special_overflow ();
+
   mpfr_init (x);
   mpfr_init (y);