Hackers' Pub

Syntax	Description	Examples
`"` keyword `"`	Finds the string within quotes, including spaces. Case-insensitive. (Escape quotes inside with `\"`)	`"Hackers' Pub"`
`from:` handle	Finds content written by the specified user.	`from:hongminhee` `from:hongminhee@hollo.social`
`lang:` ISO 639-1	Finds content written in the specified language.	`lang:en`
`#` tag	Finds content with the specified tag. Case-insensitive.	`#HackersPub`
condition condition	Finds content that satisfies both conditions on either side of the space (logical AND).	`"Hackers' Pub" lang:en`
condition `OR` condition	Finds content that satisfies at least one of the conditions on either side of the OR operator (logical OR).	`#HackersPub OR "Hackers' Pub" lang:en`
`(` condition `)`	Combines the operators within the parentheses first.	`(#HackersPub OR "Hackers' Pub" OR "Hackers Pub") lang:en`

matt godbolt @mattgodbolt@hachyderm.io

12/13/2025, 1:09:03 PM

Public

Day 13 of Advent of Compiler Optimisations!

You're calling a function inside a loop, but its result never changes between iterations. Does the compiler spot this and hoist it out? Turns out the answer depends on which compiler you use! Clang pulls off the optimisation beautifully, but gcc stumbles—even with explicit hints. What's going on?

#AoCO2025

Loop-Invariant Code Motion — Matt Godbolt’s blog

The compiler can move code outside of loops to speed things up

xania.org

TinheadNed @tinheadned@dice.camp

12/13/2025, 1:31:30 PM

Public

@mattgodbolt loving this series, btw. My colleagues are getting irritated by me banging on about it.

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