akr	2013-08-18 10:07:50 +0900 (Sun, 18 Aug 2013)

  New Revision: 42603

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=42603

  Log:
    * bignum.c (rb_big2str1): Make an expression more explicit.

  Modified files:
    trunk/ChangeLog
    trunk/bignum.c
Index: ChangeLog
===================================================================
--- ChangeLog	(revision 42602)
+++ ChangeLog	(revision 42603)
@@ -1,3 +1,7 @@ https://github.com/ruby/ruby/blob/trunk/ChangeLog#L1
+Sun Aug 18 10:05:12 2013  Tanaka Akira  <akr@f...>
+
+	* bignum.c (rb_big2str1): Make an expression more explicit.
+
 Sun Aug 18 03:18:45 2013  Tanaka Akira  <akr@f...>
 
 	* bignum.c (rb_big2str1): Use power_level instead of bitsize(xn).
Index: bignum.c
===================================================================
--- bignum.c	(revision 42602)
+++ bignum.c	(revision 42603)
@@ -4569,7 +4569,7 @@ rb_big2str1(VALUE x, int base) https://github.com/ruby/ruby/blob/trunk/bignum.c#L4569
         VALUE tmpw = 0;
         BDIGIT *wds;
         size_t wn;
-        wn = power_level + RBIGNUM_LEN(power);
+        wn = power_level * BIGDIVREM_EXTRA_WORDS + RBIGNUM_LEN(power);
         wds = ALLOCV_N(BDIGIT, tmpw, xn + wn);
         MEMCPY(wds, xds, BDIGIT, xn);
 	big2str_karatsuba(&b2s_data, wds, xn, wn, power_level, 0);

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