138 lines
5.0 KiB
Java
138 lines
5.0 KiB
Java
/*
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* Copyright (c) 2016, 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8054307
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* @summary Validates StringCoding.hasNegatives intrinsic with a small range of tests.
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* @library /compiler/patches
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* @library /test/lib
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*
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* @build java.base/java.lang.Helper
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* @run main compiler.intrinsics.string.TestHasNegatives
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*/
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/*
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* @test
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* @bug 8054307 8318509
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* @summary Validates StringCoding.hasNegatives intrinsic for AVX3 works with and without
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* AVX3Threshold=0
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* @key randomness
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* @library /compiler/patches
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* @library /test/lib
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*
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* @build java.base/java.lang.Helper
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* @requires vm.cpu.features ~= ".*avx512.*"
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* @run main/othervm/timeout=1200 -XX:UseAVX=3 compiler.intrinsics.string.TestHasNegatives
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* @run main/othervm/timeout=1200 -XX:UseAVX=3 -XX:+UnlockDiagnosticVMOptions -XX:AVX3Threshold=0 compiler.intrinsics.string.TestHasNegatives
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*/
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package compiler.intrinsics.string;
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import java.lang.Helper;
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import java.util.Random;
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import java.util.stream.IntStream;
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import jdk.test.lib.Utils;
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public class TestHasNegatives {
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private static byte[] bytes = new byte[4096 + 32];
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private static final Random RANDOM = Utils.getRandomInstance();
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/**
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* Completely initialize the test array, preparing it for tests of the
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* StringCoding.hasNegatives method with a given array segment offset,
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* length, and number of negative bytes.
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*/
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public static void initialize(int off, int len, int neg) {
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assert (len + off <= bytes.length);
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// insert "canary" (negative) values before offset
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for (int i = 0; i < off; ++i) {
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bytes[i] = (byte) (((i + 15) & 0x7F) | 0x80);
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}
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// fill the array segment
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for (int i = off; i < len + off; ++i) {
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bytes[i] = (byte) (((i - off + 15) & 0x7F));
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}
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if (neg != 0) {
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// modify a number (neg) disparate array bytes inside
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// segment to be negative.
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for (int i = 0; i < neg; i++) {
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int idx = off + RANDOM.nextInt(len);
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bytes[idx] = (byte) (0x80 | bytes[idx]);
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}
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}
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// insert "canary" negative values after array segment
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for (int i = len + off; i < bytes.length; ++i) {
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bytes[i] = (byte) (((i + 15) & 0x7F) | 0x80);
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}
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}
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/**
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* Test different array segment sizes, offsets, and number of negative
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* bytes.
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*/
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public static void test_hasNegatives() throws Exception {
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for (int off = 0; off < 16; off++) { // starting offset of array segment
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// Test all array segment sizes 1-63
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for (int len = 1; len < 64; len++) {
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test_hasNegatives(off, len, 0);
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test_hasNegatives(off, len, 1);
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test_hasNegatives(off, len, RANDOM.nextInt(30) + 2);
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}
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// Test a random selection of sizes between 64 and 4099, inclusive
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for (int i = 0; i < 20; i++) {
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int len = 64 + RANDOM.nextInt(4100 - 64);
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test_hasNegatives(off, len, 0);
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test_hasNegatives(off, len, 1);
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test_hasNegatives(off, len, RANDOM.nextInt(len) + 2);
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}
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}
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}
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private static void test_hasNegatives(int off, int len, int maxNegatives) throws Exception {
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assert (len + off < bytes.length);
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initialize(off, len, maxNegatives);
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boolean expected = (maxNegatives > 0);
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boolean actual = Helper.StringCodingHasNegatives(bytes, off, len);
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if (actual != expected) {
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throw new Exception("Failed test hasNegatives " + "offset: " + off + " "
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+ "length: " + len + " " + "return: " + actual + " " + "negatives: "
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+ maxNegatives);
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}
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}
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public void run() throws Exception {
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// iterate to eventually get intrinsic inlined
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for (int j = 0; j < 1000; ++j) {
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test_hasNegatives();
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}
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}
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public static void main(String[] args) throws Exception {
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(new TestHasNegatives()).run();
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System.out.println("hasNegatives validated");
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}
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}
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