jdk

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/*
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 * Copyright (c) 2015, 2023, Oracle and/or its affiliates. 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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 */
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#include "precompiled.hpp"
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#include "runtime/registerMap.hpp"
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#include "vmreg_x86.inline.hpp"
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address RegisterMap::pd_location(VMReg reg) const {
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  if (reg->is_XMMRegister()) {
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    int reg_base = reg->value() - ConcreteRegisterImpl::max_fpr;
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    int base_reg_enc = (reg_base / XMMRegister::max_slots_per_register);
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    assert(base_reg_enc >= 0 && base_reg_enc < XMMRegister::number_of_registers, "invalid XMMRegister: %d", base_reg_enc);
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    VMReg base_reg = as_XMMRegister(base_reg_enc)->as_VMReg();
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    intptr_t offset_in_bytes = (reg->value() - base_reg->value()) * VMRegImpl::stack_slot_size;
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    if (base_reg_enc > 15) {
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      if (offset_in_bytes == 0) {
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        return nullptr; // ZMM16-31 are stored in full.
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      }
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    } else {
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      if (offset_in_bytes == 0 || offset_in_bytes == 16 || offset_in_bytes == 32) {
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        // Reads of the low and high 16 byte parts should be handled by location itself because
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        // they have separate callee saved entries (see RegisterSaver::save_live_registers()).
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        return nullptr;
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      }
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      // The upper part of YMM0-15 and ZMM0-15 registers are saved separately in the frame.
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      if (offset_in_bytes > 32) {
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        base_reg = base_reg->next(8);
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        offset_in_bytes -= 32;
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      } else if (offset_in_bytes > 16) {
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        base_reg = base_reg->next(4);
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        offset_in_bytes -= 16;
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      } else {
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        // XMM0-15 case (0 < offset_in_bytes < 16). No need to adjust base register (or offset).
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      }
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    }
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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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    }
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  }
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  return nullptr;
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}
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address RegisterMap::pd_location(VMReg base_reg, int slot_idx) const {
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  return location(base_reg->next(slot_idx), nullptr);
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}
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