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