# Matt Godbolt's Advent of Compiler Optimisations 2025

**URL:** <https://discourse.julialang.org/t/matt-godbolts-advent-of-compiler-optimisations-2025/133926>\
**Category:** Offtopic\
**Created:** [November 17, 2025, 9:00am UTC](https://discourse.julialang.org/t/matt-godbolts-advent-of-compiler-optimisations-2025/133926 "2025-11-17T09:00:58Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![xiaoxi](https://avatars.discourse-cdn.com/v4/letter/x/a9adbd/32.png) [@xiaoxi](https://discourse.julialang.org/u/xiaoxi)\
**Post date:** [November 17, 2025, 9:00am UTC](https://discourse.julialang.org/t/matt-godbolts-advent-of-compiler-optimisations-2025/133926/1 "2025-11-17T09:00:58Z")

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Matt Godbolt plans to publish a daily article and video, each detailing a fun and interesting optimization that the compiler can perform in C or C++, from December 1st to the 25th.

> **[Introducing the Advent of Compiler Optimisations 2025 — Matt Godbolt’s blog](https://xania.org/202511/advent-of-compiler-optimisation)**
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> Announcing AoCO 2025 - daily December posts about compiler optimisations

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**Author:** ![xiaoxi](https://avatars.discourse-cdn.com/v4/letter/x/a9adbd/32.png) [@xiaoxi](https://discourse.julialang.org/u/xiaoxi)\
**Post date:** [December 1, 2025, 12:46pm UTC](https://discourse.julialang.org/t/matt-godbolts-advent-of-compiler-optimisations-2025/133926/2 "2025-12-01T12:46:04Z")

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Matt has published his first blog post on compiler optimizations.

> **[Why xor eax, eax? — Matt Godbolt’s blog](https://xania.org/202512/01-xor-eax-eax)**
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> Why do compilers love xor-ing registers so much?

I hope the next blog posts will be as interesting as this one.

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**Author:** ![2forty2](https://avatars.discourse-cdn.com/v4/letter/2/9de053/32.png) [@2forty2](https://discourse.julialang.org/u/2forty2)\
**Post date:** [December 10, 2025, 2:09pm UTC](https://discourse.julialang.org/t/matt-godbolts-advent-of-compiler-optimisations-2025/133926/3 "2025-12-10T14:09:15Z")

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This was very interesting and insightful, cant wait for more!

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**Author:** ![xiaoxi](https://avatars.discourse-cdn.com/v4/letter/x/a9adbd/32.png) [@xiaoxi](https://discourse.julialang.org/u/xiaoxi)\
**Post date:** [December 25, 2025, 2:45pm UTC](https://discourse.julialang.org/t/matt-godbolts-advent-of-compiler-optimisations-2025/133926/4 "2025-12-25T14:45:53Z")

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Today is the last blog post. Matt’s blog posts have been very instructive and insightful.

> **[AoCO2025 Archive — Matt Godbolt’s blog](https://xania.org/AoCO2025-archive)**

Let’s hope Matt decides to do it again next year.