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annotate graal/com.oracle.graal.loop/src/com/oracle/graal/loop/phases/LoopSafepointEliminationPhase.java @ 20069:2dbfa1ed5efa

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Reduce usages of fixed node probability cache.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Mon, 30 Mar 2015 00:54:07 +0200
parents 7fb828b4c32b
children 05183a084a08
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1 /*
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2 * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.loop.phases;
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24
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25 import com.oracle.graal.loop.*;
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26 import com.oracle.graal.nodes.*;
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27 import com.oracle.graal.nodes.cfg.*;
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28 import com.oracle.graal.nodes.extended.*;
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29 import com.oracle.graal.phases.*;
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30 import com.oracle.graal.phases.tiers.*;
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31
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32 public class LoopSafepointEliminationPhase extends BasePhase<MidTierContext> {
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33
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34 @Override
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35 protected void run(StructuredGraph graph, MidTierContext context) {
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36 LoopsData loops = new LoopsData(graph);
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37 if (context.getOptimisticOptimizations().useLoopLimitChecks()) {
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38 loops.detectedCountedLoops();
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39 for (LoopEx loop : loops.countedLoops()) {
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40 if (loop.loop().getChildren().isEmpty() && loop.counted().getStamp().getBits() <= 32) {
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41 boolean hasSafepoint = false;
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42 for (LoopEndNode loopEnd : loop.loopBegin().loopEnds()) {
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43 hasSafepoint |= loopEnd.canSafepoint();
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44 }
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45 if (hasSafepoint) {
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46 loop.counted().createOverFlowGuard();
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47 for (LoopEndNode loopEnd : loop.loopBegin().loopEnds()) {
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48 loopEnd.disableSafepoint();
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49 }
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50 }
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51 }
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52 }
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53 }
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54 for (LoopEx loop : loops.countedLoops()) {
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55 for (LoopEndNode loopEnd : loop.loopBegin().loopEnds()) {
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56 Block b = loops.getCFG().blockFor(loopEnd);
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57 blocks: while (b != loop.loop().getHeader()) {
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58 assert b != null;
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59 for (FixedNode node : b.getNodes()) {
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60 if (node instanceof Invoke || node instanceof ForeignCallNode) {
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61 loopEnd.disableSafepoint();
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62 break blocks;
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63 }
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64 }
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65 b = b.getDominator();
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66 }
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67 }
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68 }
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69 loops.deleteUnusedNodes();
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70 }
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71 }