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71 lines
2.9 KiB
Java
71 lines
2.9 KiB
Java
/*
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* Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @bug 8351833
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* @summary Splitting Phi memory nodes through MergeMem nodes in PhiNode::Ideal
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* could sometimes result in a too large number of added nodes within
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* a single iteration of the main loop in PhaseIterGVN::optimize. This
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* test, reduced from TestScalarReplacementMaxLiveNodes, triggers an
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* assert added as part of the fix for the linked bug/issue (the
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* assert naturally triggers only before the fix). The test's ability
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* to trigger the issue is quite sensitive to the specific String
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* constants used. The current set of chosen String constants happened
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* to work particularly well.
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* @run main/othervm -Xbatch
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* -XX:CompileCommand=CompileOnly,compiler.igvn.TestSplitPhiThroughMergeMem::test
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* compiler.igvn.TestSplitPhiThroughMergeMem
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* @run main compiler.igvn.TestSplitPhiThroughMergeMem
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*/
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package compiler.igvn;
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public class TestSplitPhiThroughMergeMem {
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public static void main(String[] args) {
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for (int i = 0; i < 10_000; i++) {
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int val = i % 50;
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test(val == 0, val % 10, val % 20);
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}
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}
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static void test(boolean flag, int param1, int param2) {
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if (flag) {
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new String("tenth" + param1);
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new String("eleventh" + param2);
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new String("fifteenth" + param2);
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new String("sixteenth" + param1);
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new String("seventeenth" + param1);
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new String("nineteenth" + param2);
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new String("tweenth" + param1);
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new String("nineth" + param1);
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new String("nineth" + param1);
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new String("eighteenth" + param1);
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new String("abcdef" + param2);
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new String("ghijklmn" + param1);
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new String("ghijklmn" + param1);
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}
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}
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}
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