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view graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/IterativeConditionalEliminationPhase.java @ 13175:85b60abfd11f
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author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Mon, 25 Nov 2013 15:31:20 -0800 |
parents | 23ccaa863eda |
children | 769fc3629f59 |
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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.phases.common; import com.oracle.graal.api.code.*; import com.oracle.graal.graph.*; import com.oracle.graal.graph.spi.*; import com.oracle.graal.nodes.*; import com.oracle.graal.phases.*; import com.oracle.graal.phases.common.util.*; import com.oracle.graal.phases.tiers.*; public class IterativeConditionalEliminationPhase extends BasePhase<PhaseContext> { private static final int MAX_ITERATIONS = 256; private final CanonicalizerPhase canonicalizer; public IterativeConditionalEliminationPhase(CanonicalizerPhase canonicalizer) { this.canonicalizer = canonicalizer; } @Override protected void run(StructuredGraph graph, PhaseContext context) { ConditionalEliminationPhase eliminate = new ConditionalEliminationPhase(context.getMetaAccess()); HashSetNodeChangeListener listener = new HashSetNodeChangeListener(); int count = 0; while (true) { graph.trackInputChange(listener); graph.trackUsagesDroppedZero(listener); eliminate.apply(graph); graph.stopTrackingInputChange(); graph.stopTrackingUsagesDroppedZero(); if (listener.getChangedNodes().isEmpty()) { break; } for (Node node : graph.getNodes()) { if (node instanceof Simplifiable) { listener.getChangedNodes().add(node); } } canonicalizer.applyIncremental(graph, context, listener.getChangedNodes()); listener.getChangedNodes().clear(); if (++count > MAX_ITERATIONS) { throw new BailoutException("Number of iterations in conditional elimination phase exceeds " + MAX_ITERATIONS); } } } }