74 lines
2.3 KiB
Java
74 lines
2.3 KiB
Java
/*
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* Copyright (c) 2024, 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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package compiler.gcbarriers;
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import compiler.lib.ir_framework.*;
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import java.lang.invoke.VarHandle;
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import java.lang.invoke.MethodHandles;
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/**
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* @test
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* @summary Test that the expanded size of ZGC barriers is taken into account in
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* C2's loop unrolling heuristics so that over-unrolling is avoided.
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* The tests use volatile memory accesses to prevent C2 from simply
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* optimizing them away.
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* @library /test/lib /
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* @requires vm.gc.Z
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* @run driver compiler.gcbarriers.TestZGCUnrolling
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*/
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public class TestZGCUnrolling {
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static class Outer {
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Object f;
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}
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static final VarHandle fVarHandle;
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static {
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MethodHandles.Lookup l = MethodHandles.lookup();
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try {
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fVarHandle = l.findVarHandle(Outer.class, "f", Object.class);
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} catch (Exception e) {
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throw new Error(e);
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}
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}
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public static void main(String[] args) {
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TestFramework.runWithFlags("-XX:+UseZGC", "-XX:LoopUnrollLimit=24");
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}
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@Test
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@IR(counts = {IRNode.STORE_P, "1"})
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public static void testNoUnrolling(Outer o, Object o1) {
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for (int i = 0; i < 64; i++) {
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fVarHandle.setVolatile(o, o1);
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}
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}
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@Run(test = {"testNoUnrolling"})
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void run() {
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testNoUnrolling(new Outer(), new Object());
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}
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}
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