jdk

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/*
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 * Copyright (c) 2021, 2023, Oracle and/or its affiliates. All rights reserved.
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 * Copyright (c) 2021, Arm Limited. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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#include "precompiled.hpp"
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#include "runtime/registerMap.hpp"
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#include "vmreg_aarch64.inline.hpp"
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address RegisterMap::pd_location(VMReg base_reg, int slot_idx) const {
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  if (base_reg->is_FloatRegister()) {
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    // Not all physical slots of an SVE register have corresponding
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    // VMRegs. However they are always saved to the stack in a
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    // contiguous region of memory so we can calculate the address of
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    // the upper slots by offsetting from the base address.
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    assert(base_reg->is_concrete(), "must pass base reg");
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    int base_reg_enc = (base_reg->value() - ConcreteRegisterImpl::max_gpr) /
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                       FloatRegister::max_slots_per_register;
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    intptr_t offset_in_bytes = slot_idx * VMRegImpl::stack_slot_size;
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    address base_location = location(base_reg, nullptr);
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    if (base_location != nullptr) {
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      return base_location + offset_in_bytes;
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    } else {
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      return nullptr;
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    }
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  } else {
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    return location(base_reg->next(slot_idx), nullptr);
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  }
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}
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