clz_func(9)

📦 version 7.3.1, in nixpkgs unstable

💅 clz_func(9) — from the Kernel API Manual, bestie ✨

okay so welcome to clz_func 🎀 this is a tiny little helper living in the Kernel API Manual, and honestly? it's giving "short and sweet and does exactly one thing." let's get into it 🦋

✨ NAME ✨

clz_func — it emulates a CLZ instruction 💫 that's it, that's the whole job, no cap

🌸 SYNOPSIS 🌸

int clz_func (struct pt_regs *regs , u32 ir );

like. look at it. two arguments, one int coming back. iconic behaviour honestly 🔥

🫶 ARGUMENTS 🫶

  • regs — the process register set 💖 this is where the registers live, and you're handing it over
  • ir — the instruction 🧚 the actual instruction you want emulated, passed as a u32

both of them need to show up. neither is optional. the vibe check is: pass both, every time ✨

👑 DESCRIPTION 👑

it returns 0 💀 because it always succeeds. literally always. no error path, no drama, no "well it depends" — 0 and out 🎀

lowkey the easiest return value in the whole emulation file and i respect it so much 🙈

🌈 SEE ALSO 🌈

the kernel file is ./arch/mips/kernel/mips-r2-to-r6-emul.c 🌸 and here is the entire friend group, no one left out, periodt:

go read them all, they're all in the same squad 🦋✨

mwah 💜 that's the page!! this one came from ./arch/mips/kernel, dated October 2026, and it's clz_func(9) all the way through — go emulate a CLZ instruction, you've got this bestie 🎀💅

📦 where this page comes from