* bignum.c (rb_big_rshift): a bug in right shift of negative

  bignums.  [ruby-core:09020]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@11104 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 0 deletions

diff --git a/bignum.c b/bignum.c
index ecf2872f08..17424b5148 100644
--- a/bignum.c
+++ b/bignum.c
@@ -1811,6 +1811,10 @@ rb_big_rshift(VALUE x, VALUE y)
     }
     xds = BDIGITS(x);
     i = RBIGNUM(x)->len; j = i - s1;
+    if (j == 0) {
+	if (RBIGNUM(x)->sign) return INT2FIX(0);
+	else return INT2FIX(-1);
+    }
     z = bignew(j, RBIGNUM(x)->sign);
     if (!RBIGNUM(x)->sign) {
 	num = ((BDIGIT_DBL)~0) << BITSPERDIG;