src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/ConditionalEliminationTest14.java
changeset 47798 9fe9292f5931
child 50858 2d3e99a72541
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.core.test/src/org/graalvm/compiler/core/test/ConditionalEliminationTest14.java	Mon Nov 06 20:29:49 2017 -0800
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2015, 2015, 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 org.graalvm.compiler.core.test;
+
+import org.graalvm.compiler.graph.iterators.NodeIterable;
+import org.graalvm.compiler.nodes.ConstantNode;
+import org.graalvm.compiler.nodes.FixedGuardNode;
+import org.graalvm.compiler.nodes.GuardNode;
+import org.graalvm.compiler.nodes.LogicNode;
+import org.graalvm.compiler.nodes.StructuredGraph;
+import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;
+import org.graalvm.compiler.nodes.calc.IntegerBelowNode;
+import org.graalvm.compiler.nodes.java.LoadIndexedNode;
+import org.graalvm.compiler.nodes.memory.FloatingReadNode;
+import org.graalvm.compiler.nodes.memory.ReadNode;
+import org.graalvm.compiler.nodes.spi.LoweringTool;
+import org.graalvm.compiler.phases.common.CanonicalizerPhase;
+import org.graalvm.compiler.phases.common.FloatingReadPhase;
+import org.graalvm.compiler.phases.common.IterativeConditionalEliminationPhase;
+import org.graalvm.compiler.phases.common.LoweringPhase;
+import org.graalvm.compiler.phases.tiers.PhaseContext;
+import org.junit.Assert;
+import org.junit.Test;
+
+import jdk.vm.ci.meta.DeoptimizationReason;
+
+/**
+ * Check that multiple bounds checks are correctly grouped together.
+ */
+public class ConditionalEliminationTest14 extends ConditionalEliminationTestBase {
+
+    public static void test1Snippet(Object[] args) {
+        Object a5 = args[5];
+        Object a7 = args[7];
+        Object a6 = args[6];
+
+        /*
+         * The order of the conditions matters: The scheduler processes the floating reads for the
+         * array loads in the order of the conditions here, and we want the index 7 access to be
+         * processed before the index 6 access.
+         */
+        if (a5 != null && a7 != null && a6 != null) {
+            sink1 = 1;
+        }
+        sink0 = 0;
+    }
+
+    @Test
+    public void test1() {
+        StructuredGraph graph = parseEager("test1Snippet", AllowAssumptions.YES);
+        CanonicalizerPhase canonicalizer = new CanonicalizerPhase();
+        PhaseContext context = new PhaseContext(getProviders());
+
+        /* Convert the LoadIndexNode to ReadNode with floating guards. */
+        new LoweringPhase(canonicalizer, LoweringTool.StandardLoweringStage.HIGH_TIER).apply(graph, context);
+        /* Convert the ReadNode to FloatingReadNode. */
+        new FloatingReadPhase().apply(graph);
+        /* Apply the phase that we want to test. */
+        new IterativeConditionalEliminationPhase(canonicalizer, true).apply(graph, context);
+
+        Assert.assertEquals("All guards must be floating", 0, graph.getNodes(FixedGuardNode.TYPE).count());
+        Assert.assertEquals("All array accesses must have been lowered", 0, graph.getNodes().filter(LoadIndexedNode.class).count());
+        Assert.assertEquals("All reads must be floating", 0, graph.getNodes().filter(ReadNode.class).count());
+        Assert.assertEquals("Must have floating reads (3 array accesses, 1 array length)", 4, graph.getNodes().filter(FloatingReadNode.class).count());
+
+        NodeIterable<GuardNode> boundsChecks = graph.getNodes(GuardNode.TYPE).filter(n -> ((GuardNode) n).getReason() == DeoptimizationReason.BoundsCheckException);
+        Assert.assertEquals("Must have only 1 bounds check remaining", 1, boundsChecks.count());
+        LogicNode condition = boundsChecks.first().getCondition();
+        Assert.assertTrue("Bounds check must check for array length 8", condition instanceof IntegerBelowNode && ((IntegerBelowNode) condition).getY().valueEquals(ConstantNode.forInt(8)));
+    }
+}