src/share/vm/opto/lcm.cpp

*** 614,625 ****
            n->del_req(n->req() - 1);
            n->add_prec(oop_store);
            assert(cfg->_bbs[oop_store->_idx]->_dom_depth <= this->_dom_depth, "oop_store must dominate card-mark");
          }
        }
!       if( n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_MemBarAcquire &&
!           n->req() > TypeFunc::Parms ) {
          // MemBarAcquire could be created without Precedent edge.
          // del_req() replaces the specified edge with the last input edge
          // and then removes the last edge. If the specified edge > number of
          // edges the last edge will be moved outside of the input edges array
          // and the edge will be lost. This is why this code should be
--- 614,626 ----
            n->del_req(n->req() - 1);
            n->add_prec(oop_store);
            assert(cfg->_bbs[oop_store->_idx]->_dom_depth <= this->_dom_depth, "oop_store must dominate card-mark");
          }
        }
!       if( n->is_Mach() && n->req() > TypeFunc::Parms &&
!           (n->as_Mach()->ideal_Opcode() == Op_MemBarAcquire ||
!            n->as_Mach()->ideal_Opcode() == Op_MemBarVolatile) ) {
          // MemBarAcquire could be created without Precedent edge.
          // del_req() replaces the specified edge with the last input edge
          // and then removes the last edge. If the specified edge > number of
          // edges the last edge will be moved outside of the input edges array
          // and the edge will be lost. This is why this code should be