FINDLSB(3G)

💅 FINDLSB — okay bestie, let's find that bit 💅

Hi hello yes this is findLSB, a page from the 3G manual, and we are about to get intimately acquainted with the least significant bit that's chillin' at 1 in your integer. 🦋

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✨ NAME ✨

findLSB — find the index of the least significant bit set to 1 in an integer

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🌸 DECLARATION 🌸

Like, here's the vibe, literally the function signatures, do not touch a single character:

genIType findLSB(genIType value);

genIType findLSB(genUType value);

Two overloads, both iconic, both giving exactly what they need to give. 👑

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🎀 PARAMETERS 🎀

• value — the value whose bits we're scanning. That's it, that's the whole parameter. She's simple, she's effective. 💖

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✨ DESCRIPTION ✨

So findLSB returns the bit number of the least significant bit that is set to 1 in the binary representation of value. Basically: we're walking from the bottom up, looking for the first little 1 that says hi. 🔥

And if value is zero? -1 will be returned. No bits are set, so there's nothing to find, and the function just tells you -1. Not a vibe, but it's honest. 💀

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👑 VERSION SUPPORT 👑

Not every OpenGL Shading Language version was ready for this energy, so here's the receipts, one version at a time — function name findLSB:

• 1.10 — - (nope)
• 1.20 — - (nope)
• 1.30 — - (nope)
• 1.40 — - (nope)
• 1.50 — - (nope)
• 3.30 — - (nope)
• 4.00 — ✔ (yes bestie)
• 4.10 — ✔
• 4.20 — ✔
• 4.30 — ✔
• 4.40 — ✔
• 4.50 — ✔

So like, 4.00 and onward? She ate. Everything before? Not invited to the function. 🙈

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🦋 SEE ALSO 🦋

• findMSB()

(yes, her more significant sister, go read that one too, iykyk 💜)

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💖 COPYRIGHT 💖

Copyright © 2011-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.

Copyright © 2011-2014 Khronos Group

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Okay that's the whole page, mwah, ily, go find some bits. This little number came from the [FIXME: source] crew and it's dated 01/03/2018 — FINDLSB(3G), periodt. 🫶✨