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/*
* Copyright (c) 2019, Red Hat, Inc. 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.
*/
/**
* @test
* @bug 8231550
* @summary C2: ShouldNotReachHere() in verify_strip_mined_scheduling
*
* @run main/othervm -XX:-BackgroundCompilation -XX:LoopMaxUnroll=0 TestConservativeAntiDep
*
*/
import java.lang.reflect.Array;
import java.util.Arrays;
public class TestConservativeAntiDep {
private static long longField;
public static void main(String[] args) throws InstantiationException, IllegalAccessException {
for (int i = 0; i < 20_000; i++) {
test1(A.class);
test2(B.class);
}
}
private static int test1(Class klass) {
Object[] in = (Object[])Array.newInstance(klass, 100);
Object[] o = in;
int v = 1;
// CountedLoop has control dependent CastPP
for (int i = 0; i < 100 ; i++) {
longField = i; // sunk in outer strip mined loop
o = (A[]) o;
v *= 2;
}
// LoadRange cannot float higher than CountedLoop (because of
// CastPP) and is found anti-dependent with long store so
// scheduled in outer strip mined loop
return v + o.length;
}
private static int test2(Class klass) throws IllegalAccessException, InstantiationException {
A in = (A)klass.newInstance();
A o = in;
int v = 1;
// CountedLoop has control dependent CastPP
for (int i = 0; i < 100 ; i++) {
longField = i; // sunk in outer strip mined loop
o = (B) o;
v *= 2;
}
// Load cannot float higher than CountedLoop (because of
// CastPP) and is found anti-dependent with long store so
// scheduled in outer strip mined loop
return v + o.intField;
}
private static class A {
int intField;
public A() {}
}
private static class B extends A {
public B() {}
}
}
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