fixed bug found by G. Ballabio for b=0 and 0<c<1

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@495 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 5 insertions, 1 deletions

diff --git a/cmp.c b/cmp.c
index e4141671c..2a471b28e 100644
--- a/cmp.c
+++ b/cmp.c
@@ -53,7 +53,11 @@ mpfr_cmp3(b, c, s)
    unsigned long bn, cn;
    mp_limb_t *bp, *cp;
 
-   if (!NOTZERO(b) && !NOTZERO(c)) { return 0; }
+   if (!NOTZERO(b)) {
+     if (!NOTZERO(c)) return 0; else return -(MPFR_SIGN(c));
+   }
+   else if (!NOTZERO(c)) return MPFR_SIGN(b);
+
    s = s * MPFR_SIGN(b) * MPFR_SIGN(c);
    if (s<0) return(MPFR_SIGN(b));