JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2018, 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.
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package org.graalvm.compiler.hotspot.amd64.test;

import org.junit.Test;
import org.junit.Assert;

/**
 * Tests Bit Manipulation Instruction blsr pattern matching and result.
 */
public class BmiBlsr extends BmiCompilerTest {
    // from Intel manual VEX.NDD.LZ.0F38.W0 F3 /3, example c4e260f2c2
    private final byte[] instrMask = new byte[]{
                    (byte) 0xFF,
                    (byte) 0x1F,
                    (byte) 0x00,
                    (byte) 0xFF,
                    (byte) 0b0011_1000};
    private final byte[] instrPattern = new byte[]{
                    (byte) 0xC4, // prefix for 3-byte VEX instruction
                    (byte) 0x02, // 00010 implied 0F 38 leading opcode bytes
                    (byte) 0x00,
                    (byte) 0xF3,
                    (byte) 0b0000_1000}; // bits 543 == 011 (3)

    public int blsri(int n1) {
        return (n1 & (n1 - 1));
    }

    public long blsrl(long n1) {
        return (n1 & (n1 - 1));
    }

    // Pattern matching check for blsri
    @Test
    public void test1() {
        Assert.assertTrue(verifyPositive("blsri", instrMask, instrPattern));
    }

    // Pattern matching check for blsrl
    @Test
    public void test2() {

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