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/*
* Copyright (c) 2016, 2023, 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 8054307
* @summary Validates StringCoding.hasNegatives intrinsic with a small range of tests.
* @library /compiler/patches
* @library /test/lib
*
* @build java.base/java.lang.Helper
* @run main compiler.intrinsics.string.TestHasNegatives
*/
/*
* @test
* @bug 8054307 8318509
* @summary Validates StringCoding.hasNegatives intrinsic for AVX3 works with and without
* AVX3Threshold=0
* @key randomness
* @library /compiler/patches
* @library /test/lib
*
* @build java.base/java.lang.Helper
* @requires vm.cpu.features ~= ".*avx512.*"
* @run main/othervm/timeout=1200 -XX:UseAVX=3 compiler.intrinsics.string.TestHasNegatives
* @run main/othervm/timeout=1200 -XX:UseAVX=3 -XX:+UnlockDiagnosticVMOptions -XX:AVX3Threshold=0 compiler.intrinsics.string.TestHasNegatives
*/
package compiler.intrinsics.string;
import java.lang.Helper;
import java.util.Random;
import java.util.stream.IntStream;
import jdk.test.lib.Utils;
public class TestHasNegatives {
private static byte[] bytes = new byte[4096 + 32];
private static final Random RANDOM = Utils.getRandomInstance();
/**
* Completely initialize the test array, preparing it for tests of the
* StringCoding.hasNegatives method with a given array segment offset,
* length, and number of negative bytes.
*/
public static void initialize(int off, int len, int neg) {
assert (len + off <= bytes.length);
// insert "canary" (negative) values before offset
for (int i = 0; i < off; ++i) {
bytes[i] = (byte) (((i + 15) & 0x7F) | 0x80);
}
// fill the array segment
for (int i = off; i < len + off; ++i) {
bytes[i] = (byte) (((i - off + 15) & 0x7F));
}
if (neg != 0) {
// modify a number (neg) disparate array bytes inside
// segment to be negative.
for (int i = 0; i < neg; i++) {
int idx = off + RANDOM.nextInt(len);
bytes[idx] = (byte) (0x80 | bytes[idx]);
}
}
// insert "canary" negative values after array segment
for (int i = len + off; i < bytes.length; ++i) {
bytes[i] = (byte) (((i + 15) & 0x7F) | 0x80);
}
}
/**
* Test different array segment sizes, offsets, and number of negative
* bytes.
*/
public static void test_hasNegatives() throws Exception {
for (int off = 0; off < 16; off++) { // starting offset of array segment
// Test all array segment sizes 1-63
for (int len = 1; len < 64; len++) {
test_hasNegatives(off, len, 0);
test_hasNegatives(off, len, 1);
test_hasNegatives(off, len, RANDOM.nextInt(30) + 2);
}
// Test a random selection of sizes between 64 and 4099, inclusive
for (int i = 0; i < 20; i++) {
int len = 64 + RANDOM.nextInt(4100 - 64);
test_hasNegatives(off, len, 0);
test_hasNegatives(off, len, 1);
test_hasNegatives(off, len, RANDOM.nextInt(len) + 2);
}
}
}
private static void test_hasNegatives(int off, int len, int maxNegatives) throws Exception {
assert (len + off < bytes.length);
initialize(off, len, maxNegatives);
boolean expected = (maxNegatives > 0);
boolean actual = Helper.StringCodingHasNegatives(bytes, off, len);
if (actual != expected) {
throw new Exception("Failed test hasNegatives " + "offset: " + off + " "
+ "length: " + len + " " + "return: " + actual + " " + "negatives: "
+ maxNegatives);
}
}
public void run() throws Exception {
// iterate to eventually get intrinsic inlined
for (int j = 0; j < 1000; ++j) {
test_hasNegatives();
}
}
public static void main(String[] args) throws Exception {
(new TestHasNegatives()).run();
System.out.println("hasNegatives validated");
}
}
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