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+Sun Dec 14 22:31:19 2008  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* bignum.c (bigmul1_karatsuba): remove temporal bignum.
+
+	* bignum.c (bigsqr): call bigmul0(x, x) because it is faster than the
+	  original bigsqr at this point.  
+
+	* bignum.c (rb_big_pow): a value returned from bigsqr is already
+	  truncated.
+
 Sun Dec 14 21:13:02 2008  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* bignum.c (bigmul1_karatsuba): fix comment and refactoring.