*** old/src/share/vm/opto/stringopts.cpp	Fri Jul 13 12:19:17 2012
--- new/src/share/vm/opto/stringopts.cpp	Fri Jul 13 12:19:17 2012

*** 531,541 ****
--- 531,551 ----
          sc->push_char(arg);
        } else {
          if (arg->is_Proj() && arg->in(0)->is_CallStaticJava()) {
            CallStaticJavaNode* csj = arg->in(0)->as_CallStaticJava();
            if (csj->method() != NULL &&
!               csj->method()->intrinsic_id() == vmIntrinsics::_Integer_toString) {
!               csj->method()->intrinsic_id() == vmIntrinsics::_Integer_toString &&
+               arg->outcnt() == 1) {
+             // _control is the list of StringBuilder calls nodes which
+             // will be replaced by new String code after this optimization.
+             // Integer::toString() call is not part of StringBuilder calls
+             // chain. It could be eliminated only if its result is used
+             // only by this SB calls chain.
+             // Another limitation: it should be used only once because
+             // it is unknown that it is used only by this SB calls chain
+             // until all related SB calls nodes are collected.
+             assert(arg->unique_out() == cnode, "sanity");
              sc->add_control(csj);
              sc->push_int(csj->in(TypeFunc::Parms));
              continue;
            }
          }