fixed pb in cmp_si when i = -2^31 (then beware that -1 * i < 0 !!!)

git-svn-id: svn://scm.gforge.inria.fr/svn/mpfr/trunk@1785 280ebfd0-de03-0410-8827-d642c229c3f4

1 files changed, 5 insertions, 2 deletions

diff --git a/cmp_ui.c b/cmp_ui.c
index c678d2ed0..410d1de2f 100644
--- a/cmp_ui.c
+++ b/cmp_ui.c
@@ -78,10 +78,13 @@ mpfr_cmp_si_2exp (mpfr_srcptr b, long int i, int f )
 {
   int e, k, bn, si; mp_limb_t c, *bp;
 
-  if (MPFR_IS_NAN(b)) return 1;
+  if (MPFR_IS_NAN(b))
+    return 1;
 
   si = (i<0) ? -1 : 1; /* sign of i */
-  if (MPFR_SIGN(b) * i < 0 || MPFR_IS_INF(b)) return MPFR_SIGN(b); 
+  if ((MPFR_SIGN(b) * si < 0) || MPFR_IS_INF(b))
+    return MPFR_SIGN(b);
+
   /* both signs differ */
   else if (!MPFR_NOTZERO(b) || (i==0)) { /* one is zero */
     if (i==0) return ((MPFR_NOTZERO(b)) ? MPFR_SIGN(b) : 0);