view graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/type/TopStamp.java @ 5820:547587296886

Make ReadEliminationPhase support phis (eliminates read when the last access is a memeory phi of writes, recursively) Add a TopStamp (identity element for meet) and use it to create kind-less phis that later get a non-top phi by infering thir stamp thanks to inputs ignore binary graph files
author Gilles Duboscq <duboscq@ssw.jku.at>
date Thu, 12 Jul 2012 18:58:36 +0200
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/*
 * Copyright (c) 2012, 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.
 */
package com.oracle.graal.nodes.type;


public final class TopStamp extends Stamp {

    TopStamp() {
        super(null);
    }

    @Override
    public boolean alwaysDistinct(Stamp other) {
        return false;
    }

    @Override
    public Stamp meet(Stamp other) {
        return other;
    }

}