src/hotspot/cpu/aarch64/c1_MacroAssembler_aarch64.cpp

@@ -159,12 +159,11 @@
    }
  }
  
  void C1_MacroAssembler::initialize_header(Register obj, Register klass, Register len, Register t1, Register t2) {
    assert_different_registers(obj, klass, len);
-   // This assumes that all prototype bits fit in an int32_t
-   mov(t1, (int32_t)(intptr_t)markWord::prototype().value());
+   ldr(t1, Address(klass, Klass::prototype_header_offset()));
    str(t1, Address(obj, oopDesc::mark_offset_in_bytes()));
  
    if (UseCompressedClassPointers) { // Take care not to kill klass
      encode_klass_not_null(t1, klass);
      strw(t1, Address(obj, oopDesc::klass_offset_in_bytes()));