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/*
* Copyright (c) 2025, 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.
*/
/* @test
* @bug 8349637
* @requires vm.flavor == "server" & (vm.opt.TieredStopAtLevel == null | vm.opt.TieredStopAtLevel == 4)
* @summary Ensure that vectorization of numberOfLeadingZeros and numberOfTrailingZeros outputs correct values
* @library /test/lib /
* @run main/othervm compiler.vectorization.TestVectorZeroCount
*/
package compiler.vectorization;
import java.util.Random;
import jdk.test.lib.Utils;
public class TestVectorZeroCount {
private static final int SIZE = 1024;
private static final Random RANDOM = Utils.getRandomInstance();
private static final int[] INT_VALUES = new int[SIZE];
private static final int[] INT_EXPECTED_LEADING = new int[SIZE];
private static final int[] INT_RESULT_LEADING = new int[SIZE];
private static final int[] INT_EXPECTED_TRAILING = new int[SIZE];
private static final int[] INT_RESULT_TRAILING = new int[SIZE];
private static final long[] LONG_VALUES = new long[SIZE];
private static final long[] LONG_EXPECTED_LEADING = new long[SIZE];
private static final long[] LONG_RESULT_LEADING = new long[SIZE];
private static final long[] LONG_EXPECTED_TRAILING = new long[SIZE];
private static final long[] LONG_RESULT_TRAILING = new long[SIZE];
private static final int INT_START_INDEX = Integer.MIN_VALUE;
private static final int INT_END_INDEX = Integer.MAX_VALUE;
private static final int LONG_START_INDEX = 0;
private static final int LONG_END_INDEX = 100_000_000;
private static int intCounter;
private static int longCounter;
public static boolean testInt() {
boolean done = false;
// Non-vectorized loop as baseline (not vectorized because source array is initialized)
for (int i = 0; i < SIZE; ++i) {
INT_VALUES[i] = intCounter++;
if (intCounter == INT_END_INDEX) {
done = true;
}
INT_EXPECTED_LEADING[i] = Integer.numberOfLeadingZeros(INT_VALUES[i]);
INT_EXPECTED_TRAILING[i] = Integer.numberOfTrailingZeros(INT_VALUES[i]);
}
// Vectorized loop
for (int i = 0; i < SIZE; ++i) {
INT_RESULT_LEADING[i] = Integer.numberOfLeadingZeros(INT_VALUES[i]);
}
for (int i = 0; i < SIZE; ++i) {
INT_RESULT_TRAILING[i] = Integer.numberOfTrailingZeros(INT_VALUES[i]);
}
// Compare results
for (int i = 0; i < SIZE; ++i) {
if (INT_RESULT_LEADING[i] != INT_EXPECTED_LEADING[i]) {
throw new RuntimeException("Unexpected result for Integer.numberOfLeadingZeros(" + INT_VALUES[i] + "): " + INT_RESULT_LEADING[i] + ", expected " + INT_EXPECTED_LEADING[i]);
}
if (INT_RESULT_TRAILING[i] != INT_EXPECTED_TRAILING[i]) {
throw new RuntimeException("Unexpected result for Integer.numberOfTrailingZeros(" + INT_VALUES[i] + "): " + INT_RESULT_TRAILING[i] + ", expected " + INT_EXPECTED_TRAILING[i]);
}
}
return done;
}
public static boolean testLong() {
boolean done = false;
// Non-vectorized loop as baseline (not vectorized because source array is initialized)
for (int i = 0; i < SIZE; ++i) {
// Use random values because the long range is too large to iterate over it
LONG_VALUES[i] = RANDOM.nextLong();
if (longCounter++ == LONG_END_INDEX) {
done = true;
}
LONG_EXPECTED_LEADING[i] = Long.numberOfLeadingZeros(LONG_VALUES[i]);
LONG_EXPECTED_TRAILING[i] = Long.numberOfTrailingZeros(LONG_VALUES[i]);
}
// Vectorized loop
for (int i = 0; i < SIZE; ++i) {
LONG_RESULT_LEADING[i] = Long.numberOfLeadingZeros(LONG_VALUES[i]);
}
for (int i = 0; i < SIZE; ++i) {
LONG_RESULT_TRAILING[i] = Long.numberOfTrailingZeros(LONG_VALUES[i]);
}
// Compare results
for (int i = 0; i < SIZE; ++i) {
if (LONG_RESULT_LEADING[i] != LONG_EXPECTED_LEADING[i]) {
throw new RuntimeException("Unexpected result for Long.numberOfLeadingZeros(" + LONG_VALUES[i] + "): " + LONG_RESULT_LEADING[i] + ", expected " + LONG_EXPECTED_LEADING[i]);
}
if (LONG_RESULT_TRAILING[i] != LONG_EXPECTED_TRAILING[i]) {
throw new RuntimeException("Unexpected result for Long.numberOfTrailingZeros(" + LONG_VALUES[i] + "): " + LONG_RESULT_TRAILING[i] + ", expected " + LONG_EXPECTED_TRAILING[i]);
}
}
return done;
}
public static void main(String[] args) {
// Run twice to make sure compiled code is used from the beginning
for (int i = 0; i < 2; ++i) {
intCounter = INT_START_INDEX;
longCounter = LONG_START_INDEX;
while (!testLong()) ;
while (!testInt()) ;
}
}
}
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