Improve test for signed 0.

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@3664 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 4 insertions, 2 deletions

diff --git a/tests/tatan.c b/tests/tatan.c
index 350b88855..3cfbe49cb 100644
--- a/tests/tatan.c
+++ b/tests/tatan.c
@@ -94,15 +94,17 @@ special (void)
 
   /* atan(+/-0) = +/-0 */
   mpfr_set_ui (x, 0, GMP_RNDN);
+  MPFR_SET_NEG (y);
   mpfr_atan (y, x, GMP_RNDN);
-  if (mpfr_cmp_ui (y, 0) || mpfr_sgn (y) < 0)
+  if (mpfr_cmp_ui (y, 0) || MPFR_IS_NEG (y))
     {
       printf ("Error: mpfr_atan (+0) <> +0\n");
       exit (1);
     }
   mpfr_neg (x, x, GMP_RNDN);
+  MPFR_SET_POS (y);
   mpfr_atan (y, x, GMP_RNDN);
-  if (mpfr_cmp_ui (y, 0) || mpfr_sgn (y) > 0)
+  if (mpfr_cmp_ui (y, 0) || MPFR_IS_POS (y))
     {
       printf ("Error: mpfr_atan (-0) <> -0\n");
       exit (1);