1 /*

     2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 

    25 

    26 package org.graalvm.compiler.api.directives.test;

    27 

    28 import org.graalvm.compiler.api.directives.GraalDirectives;

    29 import org.graalvm.compiler.core.test.GraalCompilerTest;

    30 import org.graalvm.compiler.graph.iterators.NodeIterable;

    31 import org.graalvm.compiler.nodes.IfNode;

    32 import org.graalvm.compiler.nodes.StructuredGraph;

    33 import org.junit.Assert;

    34 import org.junit.Test;

    35 

    36 public class ConstantProbablityBranchFoldingTest extends GraalCompilerTest {

    37 

    38     public static int branchFoldingSnippet1() {

    39         if (GraalDirectives.injectBranchProbability(0.5, true)) {

    40             return 1;

    41         } else {

    42             return 2;

    43         }

    44     }

    45 

    46     public static int branchFoldingSnippet2() {

    47         if (GraalDirectives.injectBranchProbability(0.5, false)) {

    48             return 1;

    49         } else {

    50             return 2;

    51         }

    52     }

    53 

    54     @Test

    55     public void testEarlyFolding1() {

    56         test("branchFoldingSnippet1");

    57     }

    58 

    59     @Test

    60     public void testEarlyFolding2() {

    61         test("branchFoldingSnippet2");

    62     }

    63 

    64     @Override

    65     protected void checkLowTierGraph(StructuredGraph graph) {

    66         NodeIterable<IfNode> ifNodes = graph.getNodes(IfNode.TYPE);

    67         Assert.assertEquals("IfNode count", 0, ifNodes.count());

    68     }

    69 }