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/*
* Copyright (c) 2022, 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.c2.irTests;
import jdk.test.lib.Asserts;
import jdk.test.lib.Utils;
import java.util.Random;
import compiler.lib.ir_framework.*;
/*
* @test
* @bug 8332268
* @summary Test that Ideal transformations of UModLNode* are being performed as expected.
* @library /test/lib /
* @run driver compiler.c2.irTests.UModLNodeIdealizationTests
*/
public class UModLNodeIdealizationTests {
public static final long RANDOM_POWER_OF_2 = 1L << (1 + Utils.getRandomInstance().nextInt(62));
public static void main(String[] args) {
TestFramework.run();
}
@Run(test = {"constant", "constantAgain", "powerOf2", "powerOf2Big", "powerOf2Random", "reallyConstant"})
public void runMethod() {
long a = RunInfo.getRandom().nextInt();
a = (a == 0) ? 2 : a;
long b = RunInfo.getRandom().nextInt();
b = (b == 0) ? 2 : b;
long min = Long.MIN_VALUE;
long max = Long.MAX_VALUE;
assertResult(0, 0, true);
assertResult(a, b, false);
assertResult(min, min, false);
assertResult(max, max, false);
}
@DontCompile
public void assertResult(long a, long b, boolean shouldThrow) {
try {
Asserts.assertEQ(Long.remainderUnsigned(a, a), constant(a));
Asserts.assertFalse(shouldThrow, "Expected an exception to be thrown.");
} catch (ArithmeticException e) {
Asserts.assertTrue(shouldThrow, "Did not expect an exception to be thrown.");
}
Asserts.assertEQ(Long.remainderUnsigned(a, 1), constantAgain(a));
Asserts.assertEQ(Long.remainderUnsigned(a, 1L << 33), powerOf2(a));
Asserts.assertEQ(Long.remainderUnsigned(Long.MIN_VALUE, 302032), reallyConstant());
Asserts.assertEQ(Long.remainderUnsigned(a, Long.MIN_VALUE), powerOf2Big(a));
Asserts.assertEQ(Long.remainderUnsigned(a, RANDOM_POWER_OF_2), powerOf2Random(a));
}
@Test
@IR(failOn = {IRNode.UMOD_L, IRNode.MUL})
@IR(counts = {IRNode.DIV_BY_ZERO_TRAP, "1"})
// Checks x % x => 0
public long constant(long x) {
return Long.remainderUnsigned(x, x);
}
@Test
@IR(failOn = {IRNode.UMOD_L})
// Checks x % 1 => 0
public long constantAgain(long x) {
return Long.remainderUnsigned(x, 1);
}
@Test
@IR(failOn = {IRNode.UMOD_L, IRNode.MUL})
// Checks that modulo with two constants is calculated at compile time
public long reallyConstant() {
return Long.remainderUnsigned(Long.MIN_VALUE, 302032);
}
@Test
@IR(failOn = {IRNode.UMOD_L, IRNode.MUL})
@IR(counts = {IRNode.AND, "1"})
// Checks that for x % 2^k, 2^k-1 is used as a bit mask.
public long powerOf2(long x) {
return Long.remainderUnsigned(x, 1L << 33);
}
@Test
@IR(failOn = {IRNode.UMOD_L, IRNode.MUL})
@IR(counts = {IRNode.AND, "1"})
// Checks that for x % 2^k, 2^k-1 is used as a bit mask.
public long powerOf2Random(long x) {
return Long.remainderUnsigned(x, RANDOM_POWER_OF_2);
}
@Test
@IR(failOn = {IRNode.UMOD_L, IRNode.MUL})
@IR(counts = {IRNode.AND, "1"})
// Checks that for x % 2^k, 2^k-1 is used as a bit mask.
public long powerOf2Big(long x) {
return Long.remainderUnsigned(x, Long.MIN_VALUE);
}
}
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