//

// Copyright (c) 2018, Red Hat, Inc. All rights reserved.

//

// 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.

//

// This code is distributed in the hope that it will be useful, but WITHOUT

// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// version 2 for more details (a copy is included in the LICENSE file that

// accompanied this code).

//

// You should have received a copy of the GNU General Public License version

// 2 along with this work; if not, write to the Free Software Foundation,

// Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

//

// Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

// or visit www.oracle.com if you need additional information or have any

// questions.

//

//

source_hpp %{

#include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp"

#include "gc/shenandoah/c2/shenandoahSupport.hpp"

%}

instruct compareAndSwapP_shenandoah(rRegI res,

                                    memory mem_ptr,

                                    eRegP tmp1, eRegP tmp2,

                                    eAXRegP oldval, eRegP newval,

                                    eFlagsReg cr)

%{

  match(Set res (ShenandoahCompareAndSwapP mem_ptr (Binary oldval newval)));

  match(Set res (ShenandoahWeakCompareAndSwapP mem_ptr (Binary oldval newval)));

  effect(TEMP tmp1, TEMP tmp2, KILL cr, KILL oldval);

  format %{ "shenandoah_cas_oop $mem_ptr,$newval" %}

  ins_encode %{

    ShenandoahBarrierSet::assembler()->cmpxchg_oop(&_masm,

                                                   $res$$Register, $mem_ptr$$Address, $oldval$$Register, $newval$$Register,

                                                   false, // swap

                                                   $tmp1$$Register, $tmp2$$Register

                                                   );

  %}

  ins_pipe( pipe_cmpxchg );

%}

instruct compareAndExchangeP_shenandoah(memory mem_ptr,

                                        eAXRegP oldval, eRegP newval,

                                        eRegP tmp1, eRegP tmp2,

                                        eFlagsReg cr)

%{

  match(Set oldval (ShenandoahCompareAndExchangeP mem_ptr (Binary oldval newval)));

  effect(KILL cr, TEMP tmp1, TEMP tmp2);

  ins_cost(1000);

  format %{ "shenandoah_cas_oop $mem_ptr,$newval" %}

  ins_encode %{

    ShenandoahBarrierSet::assembler()->cmpxchg_oop(&_masm,

                                                   NULL, $mem_ptr$$Address, $oldval$$Register, $newval$$Register,

                                                   true,  // exchange

                                                   $tmp1$$Register, $tmp2$$Register

                                                   );

  %}

  ins_pipe( pipe_cmpxchg );

%}