* bignum.c (bignorm): x may not be a bignum. [ruby-dev:28367]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@9982 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 1 deletions

diff --git a/bignum.c b/bignum.c
index 587564929b..9cf7a3702f 100644
--- a/bignum.c
+++ b/bignum.c
@@ -92,7 +92,10 @@ rb_big_2comp(VALUE x)			/* get 2's complement */
 static VALUE
 bignorm(VALUE x)
 {
-    if (!FIXNUM_P(x)) {
+    if (FIXNUM_P(x)) {
+	return x;
+    }
+    else if (TYPE(x) == T_BIGNUM) {
 	long len = RBIGNUM(x)->len;
 	BDIGIT *ds = BDIGITS(x);