001/*
002 *  This file is part of the Jikes RVM project (http://jikesrvm.org).
003 *
004 *  This file is licensed to You under the Eclipse Public License (EPL);
005 *  You may not use this file except in compliance with the License. You
006 *  may obtain a copy of the License at
007 *
008 *      http://www.opensource.org/licenses/eclipse-1.0.php
009 *
010 *  See the COPYRIGHT.txt file distributed with this work for information
011 *  regarding copyright ownership.
012 */
013package org.jikesrvm.compilers.opt.regalloc;
014
015import org.jikesrvm.compilers.opt.ir.IR;
016
017/**
018 * An object that returns an estimate of the relative cost of spilling a
019 * symbolic register.
020 * <p>
021 * This implementation returns a cost of zero for all registers.
022 */
023final class BrainDeadSpillCost extends SpillCostEstimator {
024
025  BrainDeadSpillCost(IR ir) {
026    calculate(ir);
027  }
028
029  /**
030   * {@inheritDoc}
031   * This brain-dead version does nothing.
032   *
033   * @param ir unused
034   */
035  @Override
036  void calculate(IR ir) {
037  }
038}