merges r31805 from trunk into ruby_1_9_2.

--
* numeric.c (int_pow): make sure to assign the result of x * z.
  If xz is optimized out, the value won't overflow.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@31843 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/numeric.c b/numeric.c
index 4a3efac844..203bef9c65 100644
--- a/numeric.c
+++ b/numeric.c
@@ -2573,7 +2573,7 @@ int_pow(long x, unsigned long y)
 	    y >>= 1;
 	}
 	{
-	    long xz = x * z;
+	    volatile long xz = x * z;
 	    if (!POSFIXABLE(xz) || xz / x != z) {
 		goto bignum;
 	    }