/*

 * Copyright (c) 2015, 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.

 *

 * 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.

 *

 */

#include "precompiled.hpp"

#include "runtime/registerMap.hpp"

#include "vmreg_x86.inline.hpp"

address RegisterMap::pd_location(VMReg reg) const {

  if (reg->is_XMMRegister()) {

    int regBase = reg->value() - ConcreteRegisterImpl::max_fpr;

    if (regBase % 4 == 0) {

      // Reads of the low and high 16 byte parts should be handled by location itself

      // because they have separate callee saved entries.

      // See RegisterSaver::save_live_registers().

      return NULL;

    }

    VMReg baseReg = as_XMMRegister(regBase / XMMRegisterImpl::max_slots_per_register)->as_VMReg();

    intptr_t offset = (reg->value() - baseReg->value()) * VMRegImpl::stack_slot_size; // offset in bytes

    if (offset >= 16) {

      // The high part of YMM registers are saved in a their own area in the frame

      baseReg = baseReg->next()->next()->next()->next();

      offset -= 16;

    }

    address baseLocation = location(baseReg);

    if (baseLocation != NULL) {

      return baseLocation + offset;

    }

  }

  return NULL;

}