coorection for reuse

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@1368 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 25 insertions, 14 deletions

diff --git a/log_base_2.c b/log_base_2.c
index 06c9fb2c5..f64b597b6 100644
--- a/log_base_2.c
+++ b/log_base_2.c
@@ -49,36 +49,47 @@ mpfr_log2 (r, a, rnd_mode)
       MPFR_SET_NAN(r);
       return 1;
     }
-
-  if (MPFR_IS_ZERO(a)) 
-    {
-      MPFR_SET_INF(r); 
-      if (MPFR_SIGN(r) > 0)
-	MPFR_CHANGE_SIGN(r); 
-      DIVIDE_BY_ZERO; /* Execption GMP*/
-      return 0; 
-    }
-
  /* If a is negative, the result is NaN */
   if (MPFR_SIGN(a) < 0)
     {
-      MPFR_SET_NAN(r);
-      return 1;
+      if (MPFR_IS_ZERO(a)) 
+      {
+        MPFR_SET_INF(r); 
+        if (MPFR_SIGN(r) > 0)
+          MPFR_CHANGE_SIGN(r);
+        /* Execption GMP*/ 
+        return 0; 
+      }
+      else
+      {
+        MPFR_SET_NAN(r);
+        return 1;
+      }
     }
 
   MPFR_CLEAR_NAN(r);
 
   /* check for infinity before zero */
   if (MPFR_IS_INF(a))
-    {
+    {      
       MPFR_SET_INF(r);
-      MPFR_SET_SAME_SIGN(r,a);
+      if(MPFR_SIGN(r) < 0)
+        MPFR_CHANGE_SIGN(r);
       return 0;
     }
 
   /* Now we can clear the flags without damage even if r == a */
+
   MPFR_CLEAR_INF(r); 
 
+  if (MPFR_IS_ZERO(a)) 
+    {
+      MPFR_SET_INF(r); 
+      if (MPFR_SIGN(r) > 0)
+	MPFR_CHANGE_SIGN(r);
+       /* Execption GMP*/
+      return 0; 
+    }
 
   /* If a is 1, the result is 0 */
   if (mpfr_cmp_ui(a,1) == 0)