#hackersdelight — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #hackersdelight, aggregated by home.social.
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Gestern ist das Buch mit den Bitzaubersprüchen angekommen. Da muss man als Softwareentwickler einfach mal drin schmökern. Bevor es verboten wird, weil derartiges Wissen nur noch der KI vorbehalten ist.🤣
Da stehen ohne Ende so Sachen drin wie:
"Use the following formula to turn off the rightmost 1-bit in a word, producing 0 if none (e.g., 01011000 01010000):
x & (x – 1)"Wobei x ein 32Bit-Wert ist.
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In German, "altes Wissen", maybe "ancient wisdom", correlates with Fantasy novels or magic or esoteric idiocy.
Here is a case where this may soon be a real thing. Look at this code https://github.com/openjdk/jdk/blob/3d8ffabe5dc6efda10ee7c76cca47e54b5383b48/src/java.base/share/classes/java/lang/Long.java#L1586
to count bits in an 8 byte word. 😀 🤯 It cites "HD, Figure 5-2". I wonder when, in the age of vibe coding, this truly becomes "ancient wisdom" passed on from sourcerer to sourcerer (no typo🙂).
HD: Hacker's Delight, Henry S. Warren
