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71 lines
2.3 KiB
Java
71 lines
2.3 KiB
Java
/*
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* Copyright (c) 2025, Red Hat 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 8344251
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* @summary Test that blackhole without control input are removed
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* @library /test/lib /
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* @run driver compiler.blackhole.DeadBhElimination
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*/
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package compiler.blackhole;
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import compiler.lib.ir_framework.*;
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public class DeadBhElimination {
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public static void main(String[] args) {
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TestFramework.runWithFlags(
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"-XX:-TieredCompilation",
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"-XX:+UnlockExperimentalVMOptions",
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// Prevent the dead branches to be compiled into an uncommon trap
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// instead of generating a BlackholeNode.
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"-XX:PerMethodTrapLimit=0",
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"-XX:PerMethodSpecTrapLimit=0",
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"-XX:CompileCommand=blackhole,compiler.blackhole.DeadBhElimination::iAmABlackhole"
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);
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}
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static public void iAmABlackhole(int x) {}
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@Test
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@IR(counts = {IRNode.BLACKHOLE, "1"}, phase = CompilePhase.AFTER_PARSING)
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@IR(failOn = {IRNode.BLACKHOLE}, phase = CompilePhase.FINAL_CODE)
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static void removalAfterLoopOpt() {
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int a = 77;
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int b = 0;
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do {
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a--;
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b++;
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} while (a > 0);
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// b == 77, known after first loop opts round
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// loop is detected as empty loop
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if (b == 78) { // dead
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iAmABlackhole(a);
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}
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}
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}
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