*** old/src/cpu/x86/vm/c1_LIRAssembler_x86.cpp	Mon Jun 27 20:15:51 2016
--- new/src/cpu/x86/vm/c1_LIRAssembler_x86.cpp	Mon Jun 27 20:15:51 2016

*** 3132,3141 ****
--- 3132,3158 ----
    if (flags & LIR_OpArrayCopy::dst_null_check) {
      __ testptr(dst, dst);
      __ jcc(Assembler::zero, *stub->entry());
    }
  
+   // If the compiler was not able to prove that exact type of the source or the destination
+   // of the arraycopy is an array type, check at runtime if the source or the destination is
+   // an instance type.
+   if (flags & LIR_OpArrayCopy::type_check) {
+     if (!(flags & LIR_OpArrayCopy::dst_objarray)) {
+       __ load_klass(tmp, dst);
+       __ cmpl(Address(tmp, in_bytes(Klass::layout_helper_offset())), Klass::_lh_neutral_value);
+       __ jcc(Assembler::greaterEqual, *stub->entry());
+     }
+ 
+     if (!(flags & LIR_OpArrayCopy::src_objarray)) {
+       __ load_klass(tmp, src);
+       __ cmpl(Address(tmp, in_bytes(Klass::layout_helper_offset())), Klass::_lh_neutral_value);
+       __ jcc(Assembler::greaterEqual, *stub->entry());
+     }
+   }
+ 
    // check if negative
    if (flags & LIR_OpArrayCopy::src_pos_positive_check) {
      __ testl(src_pos, src_pos);
      __ jcc(Assembler::less, *stub->entry());
    }