Hacker News Reader

tekknolagion A Survey of Inlining Heuristics

Please feel free to open a PR. I'm a bit AFK

tekknolagion A Python Interpreter Written in Python

tekknolagion The acyclic e-graph: Cranelift's mid-end optimizer

Damn. I wish I thought of that.

tekknolagion A Fuzzer for the Toy Optimizer

I will add "compiler" before "optimizer" and link to the toy optimizer series

tekknolagion Type-based alias analysis in the Toy Optimizer

Oh hi! Thanks for posting. As I wrote this I wasn't sure if it was enough of a post. Let me know if you wanted to hear about anything else that seemed missing.

tekknolagion SectorC: A C Compiler in 512 bytes (2023)

You may enjoy https://github.com/ludocode/onramp

tekknolagion Writing a Lisp JIT Interpreter with GraalVM Truffle

As I said on Lobsters as well, this is a superb overview.

tekknolagion Ask HN: Share your personal website

https://bernsteinbear.com

I write about programming languages and compilers

tekknolagion T-Ruby is Ruby with syntax for types

YJIT and ZJIT don't use method annotations.

tekknolagion ZJIT is now available in Ruby 4.0

Yes; see the first ZJIT blog post. https://railsatscale.com/2025-05-14-merge-zjit/

tekknolagion ZJIT is now available in Ruby 4.0

In that scenario, what would you hope to get out of the LBBV?

tekknolagion ZJIT is now available in Ruby 4.0

If all you're doing is summing small integers---frequently the case---it's much preferable to optimize that to be fast and then skip the very dynamic method lookup (the slower, less common case)

tekknolagion ZJIT is now available in Ruby 4.0

YJIT is not deprecated. That word has a specific meaning in Ruby. You can continue to use YJIT.

With any luck, this performance in the next year or two will be enough to make it a happy change. "Damn, free money" etc

tekknolagion ZJIT is now available in Ruby 4.0

Earnestly: why are you annoyed? I tried to make it clear that you don't have to make any changes. If you want, you can try ZJIT (which should not be anything other than a one character change), but you don't have to.

tekknolagion ZJIT is now available in Ruby 4.0

In this case, we used to abort (i.e. abort(); intentionally crash the entire process) but now we jump into the interpreter to handle the dynamic behavior.

If someone writes dynamic ruby code to add two objects, it should succeed in both integer and string cases. The JIT just wants to optimize whatever the common case is.

tekknolagion Introduction to Software Development Tooling (2024)

It's a "teach people how to teach themselves to fish" class

tekknolagion Introduction to Software Development Tooling (2024)

You'll never guess what we talk about later on in the unit. Spoiler: exactly that!

It notionally focuses on make but the concepts apply much more broadly than the one specific tool

tekknolagion Introduction to Software Development Tooling (2024)

The schedule is generated from a Python script, but doesn't involve YAML

tekknolagion MIT Missing Semester 2026

If you're interested, see also https://bernsteinbear.com/isdt/ by me and Tom

tekknolagion Abstract Interpretation in the Toy Optimizer

This kind of compiler/runtime feedback about source code is really interesting and (imo) under-studied. Especially when you take into account something like PGO data.

tekknolagion The Easiest Way to Build a Type Checker

No, HM is unification based and requires no annotations at all.

tekknolagion Copyparty, the FOSS file server [video]

sqlitedict? Or shelve/dbm?

tekknolagion A catalog of side effects

The good news is now you got tricked (accidentally, tbh) into reading about compilers!

tekknolagion Walking Around the Compiler

tekknolagion Walking around the compiler

The real fix felt more complicated when I drafted this. Seems like it isn't; I'll think about updating the post

tekknolagion The Little Book of Linear Algebra

In case the author didn't notice, the organization name appears to be missing an L - "litte"

tekknolagion Why we still build with Ruby

Re: ZJIT: all development is happening in the open in the zjit folder of the ruby/ruby repo. You can follow along!

tekknolagion Python performance myths and fairy tales

If I may toot my own horn: https://bernsteinbear.com/blog/typed-python/

tekknolagion I drank every cocktail

Excellent subtitle "let's have a tiki". Great joke

tekknolagion What I talk about when I talk about IRs

I like this. Especially the last paragraph. Mind if I quote you and expand?