intlog2(9)

💖 intlog2(9) 💖 — Kernel API Manual

okay so bestie, welcome to the intlog2 page from the Kernel API Manual. it's a little log2 situation, and the result is shifted left by 24 bits, iykyk. no cap, the vibes are mathematical but we're gonna get through it together. 🫶

✨ NAME ✨

intlog2 — computes log2 of a value; the result is shifted left by 24 bits. slay. 💅

🌸 SYNOPSIS 🌸

unsigned int intlog2 (u32 value );

🎀 ARGUMENTS 🎀

• value — the value, and bestie it must be != 0. like, zero is literally not invited 💀.

🦋 DESCRIPTION 🦋

okay so to use rational values you can use the following method, and yes it's giving formula:

intlog2(value) = intlog2(value * 2^x) - x * 2^24

Some usecase examples — these are exact, don't come for me:

intlog2(8) will give 3 << 24 = 3 * 2^24

intlog2(9) will give 3 << 24 + ... = 3.16... * 2^24

intlog2(1.5) = intlog2(3) - 2^24 = 0.584... * 2^24

⭐ RETURN ⭐

you get log2(value) * 2^24. that's it, that's the return, periodt. 🔥

👑 SEE ALSO 👑

• Kernel file ./include/linux/int_log.h — yes, that exact path, iconic behavior.
• intlog10(9) — the related logarithm page, go peep it 💜.

okay bye bestie 💖 this page is from ./include/linux, dated October 2026, and it's the intlog2(9) page — periodt. 🫶