src/share/vm/opto/macroArrayCopy.cpp

rev 7687 : 6912521: System.arraycopy works slower than the simple loop for little lengths
Summary: convert small array copies to series of loads and stores
Reviewed-by:

*** 517,527 ****
      // are correct at the source level.
      //
      // Test S[] against D[], not S against D, because (probably)
      // the secondary supertype cache is less busy for S[] than S.
      // This usually only matters when D is an interface.
!     Node* not_subtype_ctrl = ac->is_arraycopy_validated() ? top() :
        Phase::gen_subtype_check(src_klass, dest_klass, ctrl, mem, &_igvn);
      // Plug failing path into checked_oop_disjoint_arraycopy
      if (not_subtype_ctrl != top()) {
        Node* local_ctrl = not_subtype_ctrl;
        MergeMemNode* local_mem = MergeMemNode::make(mem);
--- 517,527 ----
      // are correct at the source level.
      //
      // Test S[] against D[], not S against D, because (probably)
      // the secondary supertype cache is less busy for S[] than S.
      // This usually only matters when D is an interface.
!     Node* not_subtype_ctrl = (ac->is_arraycopy_validated() || ac->is_copyof_validated() || ac->is_copyofrange_validated()) ? top() :
        Phase::gen_subtype_check(src_klass, dest_klass, ctrl, mem, &_igvn);
      // Plug failing path into checked_oop_disjoint_arraycopy
      if (not_subtype_ctrl != top()) {
        Node* local_ctrl = not_subtype_ctrl;
        MergeMemNode* local_mem = MergeMemNode::make(mem);