src/hotspot/share/opto/runtime.cpp

@@ -302,18 +302,21 @@
    if ((len > 0) && (result != nullptr) &&
        is_deoptimized_caller_frame(current)) {
      // Zero array here if the caller is deoptimized.
      int size = TypeArrayKlass::cast(array_type)->oop_size(result);
      BasicType elem_type = TypeArrayKlass::cast(array_type)->element_type();
-     const size_t hs = arrayOopDesc::header_size(elem_type);
-     // Align to next 8 bytes to avoid trashing arrays's length.
-     const size_t aligned_hs = align_object_offset(hs);
+     size_t hs_bytes = arrayOopDesc::base_offset_in_bytes(elem_type);
+     assert(is_aligned(hs_bytes, BytesPerInt), "must be 4 byte aligned");
      HeapWord* obj = cast_from_oop<HeapWord*>(result);
-     if (aligned_hs > hs) {
-       Copy::zero_to_words(obj+hs, aligned_hs-hs);
+     if (!is_aligned(hs_bytes, BytesPerLong)) {
+       *reinterpret_cast<jint*>(reinterpret_cast<char*>(obj) + hs_bytes) = 0;
+       hs_bytes += BytesPerInt;
      }
+ 
      // Optimized zeroing.
+     assert(is_aligned(hs_bytes, BytesPerLong), "must be 8-byte aligned");
+     const size_t aligned_hs = hs_bytes / BytesPerLong;
      Copy::fill_to_aligned_words(obj+aligned_hs, size-aligned_hs);
    }
  
  JRT_END