src/hotspot/cpu/x86/c1_LIRAssembler_x86.cpp

*** 1,7 ****
  /*
!  * Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
--- 1,7 ----
  /*
!  * Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
*** 1903,1912 ****
--- 1903,1932 ----
          ShouldNotReachHere();
        }
  
  }
  
+ void LIR_Assembler::emit_opFlattenedStoreCheck(LIR_OpFlattenedStoreCheck* op) {
+   Klass* k = (Klass*)(op->element_klass()->constant_encoding());
+   assert(k->is_klass(), "must be a loaded klass");
+   add_debug_info_for_null_check_here(op->info_for_exception());
+ 
+ #ifdef _LP64
+   if (UseCompressedClassPointers) {
+     __ movl(op->tmp1()->as_register(), Address(op->object()->as_register(), oopDesc::klass_offset_in_bytes()));
+     __ cmp_narrow_klass(op->tmp1()->as_register(), k);
+   } else {
+     __ movq(op->tmp1()->as_register(), Address(op->object()->as_register(), oopDesc::klass_offset_in_bytes()));
+     __ cmpq(op->tmp1()->as_register(), op->tmp2()->as_register());
+   }
+ #else
+   Unimplemented(); // FIXME
+ #endif
+ 
+   __ jcc(Assembler::notEqual, *op->stub()->entry());
+   __ bind(*op->stub()->continuation());
+ }
  
  void LIR_Assembler::emit_compare_and_swap(LIR_OpCompareAndSwap* op) {
    if (LP64_ONLY(false &&) op->code() == lir_cas_long && VM_Version::supports_cx8()) {
      assert(op->cmp_value()->as_register_lo() == rax, "wrong register");
      assert(op->cmp_value()->as_register_hi() == rdx, "wrong register");