Java – mysterious comments in JDK source code: / / HD, section 2-1

• Java

I just stumbled upon this comment

public static int lowestOneBit(int i) {
    // HD,Section 2-1
    return i & -i;
    }

In 1.5 java source code What does this comment mean? Is it a reference for a book? A specification?

Solution

HD may be hacker's delay mentioned by Henry S. Warren In fact, this formula appears in section 2-1 on page 11

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