Today I’m announcing a project that’s been in the making for around a year. As my time off draws to a close, I’ve been working on an “Advent of” type project, to be released one a day from the 1st of December until the 25th.

This December will be the Advent of Compiler Optimisations: I’ll release one blog post and video each day, each detailing a fun and interesting C or C++ optimisation that your compiler can do. I’ll go into the details of when it applies, how to interpret the assembly, and perhaps as importantly, when it doesn’t apply.

I’ll be covering some very low-level, architecture-specific tricks as well as larger, more high-level optimisations. While I mostly cover x86-64, I do touch on 64-bit and 32-bit ARM as well.

You can follow along by watching the [AoCO2025 tag](h…

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