* bignum.c (bitlength_bdigit): Fix an off-by-one error.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41060 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/bignum.c b/bignum.c
index 820eff0fb4..c197ccaca9 100644
--- a/bignum.c
+++ b/bignum.c
@@ -3193,7 +3193,7 @@ bitlength_bdigit(BDIGIT v)
     v++;
     if (v == 0)
         return SIZEOF_BDIGITS*CHAR_BIT;
-    return ffs(v); /* assumption: sizeof(BDIGIT) <= sizeof(int) */
+    return ffs(v)-1; /* assumption: sizeof(BDIGIT) <= sizeof(int) */
 }
 
 /*