src/cpu/x86/vm/c1_LIRAssembler_x86.cpp

rev 4139 : 8160591: Improve internal array handling
Reviewed-by: kvn
Contributed-by: Xiang Yuan <xiang.yuan@linaro.org>, Zoltan Majo <zoltan.majo@oracle.com>

@@ -3214,10 +3214,27 @@
   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());
   }