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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.
/**
 * 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() {
        Assert.assertTrue(verifyPositive("blsrl", instrMask, instrPattern));
    }

    // Result correctness check
    @Test
    public void test3() {
        int n1 = 42;
        test("blsri", n1);
    }

    @Test
    public void test4() {
        long n1 = 420000000;
        test("blsrl", n1);
    }
}