* array.c (ary_memcpy): try to enable optimization.

  At least on my environments, I don't see any errors
  with many trials. Please tell us if you find any GC bugs.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42192 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Fri Jul 26 18:21:58 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* array.c (ary_memcpy): try to enable optimization.
+	  At least on my environments, I don't see any errors
+	  with many trials. Please tell us if you find any GC bugs.
+
 Fri Jul 26 17:49:26 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* win32/file.c (fix_string_encoding): fix target encoding.  the

array.c

@@ -69,8 +69,7 @@ ary_memcpy(VALUE ary, long beg, long argc, const VALUE *argv)
 {
 #if 1
     if (OBJ_PROMOTED(ary)) {
-	if (0 /* disalbe now, because it cause mysterious error. */
-	    && argc > 32 /* 32 is magic number */) {
+	if (argc > (128/sizeof(VALUE)) /* is magic number (cache line size) */) {
 	    rb_gc_writebarrier_remember_promoted(ary);
 	    RARRAY_PTR_USE(ary, ptr, {
 		MEMCPY(ptr+beg, argv, VALUE, argc);