From 4e4649e13cd4175aab75a0edc2fc5b082cf735d1 Mon Sep 17 00:00:00 2001
From: naruse <naruse@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 30 May 2011 01:28:37 +0000
Subject: [PATCH] * 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/trunk@31805 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 ChangeLog | 5 +++++
 numeric.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 45ae085de9..73d38ac676 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon May 30 10:26:51 2011  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* numeric.c (int_pow): make sure to assign the result of x * z.
+	  If xz is optimized out, the value won't overflow.
+
 Sun May 29 23:17:29 2011  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* re.c (rb_reg_match): fix rdoc of Regexp#=~.
diff --git a/numeric.c b/numeric.c
index 09860dc6f2..1b80a2b6e0 100644
--- a/numeric.c
+++ b/numeric.c
@@ -2637,7 +2637,7 @@ 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;
 	    }