Mercurial > hg > truffle
view graal/com.oracle.max.graal.compiler/src/com/oracle/max/graal/compiler/phases/ReadEliminationPhase.java @ 3078:b15101f82e2d
Added read elimination phase.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Tue, 28 Jun 2011 13:52:36 +0200 |
parents | |
children | 607c6500c22e |
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/* * Copyright (c) 2011, 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.max.graal.compiler.phases; import com.oracle.max.graal.compiler.*; import com.oracle.max.graal.compiler.debug.*; import com.oracle.max.graal.compiler.ir.*; import com.oracle.max.graal.graph.*; /** * Duplicates every node in the graph to test the implementation of the {@link com.oracle.max.graal.graph.Node#copy()} method in node subclasses. */ public class ReadEliminationPhase extends Phase { @Override protected void run(Graph graph) { for (ReadNode n : graph.getNodes(ReadNode.class)) { Node memoryInput = n.inputs().variablePart().get(0); if (memoryInput instanceof WriteNode) { WriteNode other = (WriteNode) memoryInput; if (other.object() == n.object() && other.location().same(n.location())) { if (GraalOptions.TraceReadElimination) { TTY.println("Eliminated memory read " + n + "and replaced with node " + other.value()); } n.replaceAndDelete(other.value()); } } } } }