Hacker News: tekknolagi

Value numbering

tekknolagi — Mon, 06 Apr 2026 13:31:32 +0000

Article URL: https://bernsteinbear.com/blog/value-numbering/

Comments URL: https://news.ycombinator.com/item?id=47660672

Points: 2

# Comments: 0

ZJIT removes redundant object loads and stores

tekknolagi — Wed, 18 Mar 2026 21:26:23 +0000

Article URL: https://railsatscale.com/2026-03-18-how-zjit-removes-redundant-object-loads-and-stores/

Comments URL: https://news.ycombinator.com/item?id=47431625

Points: 92

# Comments: 19

New comment by tekknolagi in "A Fuzzer for the Toy Optimizer"

tekknolagi — Wed, 18 Mar 2026 21:23:32 +0000

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

Two mechanisms for dynamic type checks

tekknolagi — Fri, 20 Feb 2026 03:02:07 +0000

Article URL: https://wingolog.org/archives/2026/02/18/two-mechanisms-for-dynamic-type-checks

Comments URL: https://news.ycombinator.com/item?id=47083125

Points: 1

# Comments: 0

New comment by tekknolagi in "Type-based alias analysis in the Toy Optimizer"

tekknolagi — Fri, 20 Feb 2026 02:43:41 +0000

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.

New comment by tekknolagi in "SectorC: A C Compiler in 512 bytes (2023)"

tekknolagi — Sat, 07 Feb 2026 22:20:51 +0000

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

New comment by tekknolagi in "Writing a Lisp JIT Interpreter with GraalVM Truffle"

tekknolagi — Tue, 27 Jan 2026 05:57:55 +0000

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

New comment by tekknolagi in "Ask HN: Share your personal website"

tekknolagi — Thu, 15 Jan 2026 05:27:12 +0000

https://bernsteinbear.com

I write about programming languages and compilers

The GDB JIT Interface

tekknolagi — Tue, 30 Dec 2025 21:37:18 +0000

Article URL: https://bernsteinbear.com/blog/gdb-jit/

Comments URL: https://news.ycombinator.com/item?id=46438314

Points: 6

# Comments: 0

New comment by tekknolagi in "T-Ruby is Ruby with syntax for types"

tekknolagi — Sat, 27 Dec 2025 15:11:18 +0000

YJIT and ZJIT don't use method annotations.

New comment by tekknolagi in "ZJIT is now available in Ruby 4.0"

tekknolagi — Sat, 27 Dec 2025 00:59:51 +0000

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

New comment by tekknolagi in "ZJIT is now available in Ruby 4.0"

tekknolagi — Fri, 26 Dec 2025 20:33:46 +0000

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

New comment by tekknolagi in "ZJIT is now available in Ruby 4.0"

tekknolagi — Fri, 26 Dec 2025 20:30:55 +0000

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)

New comment by tekknolagi in "ZJIT is now available in Ruby 4.0"

tekknolagi — Fri, 26 Dec 2025 19:35:37 +0000

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

New comment by tekknolagi in "ZJIT is now available in Ruby 4.0"

tekknolagi — Fri, 26 Dec 2025 18:58:46 +0000

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.

New comment by tekknolagi in "ZJIT is now available in Ruby 4.0"

tekknolagi — Fri, 26 Dec 2025 18:55:32 +0000

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.

New comment by tekknolagi in "Introduction to Software Development Tooling (2024)"

tekknolagi — Wed, 17 Dec 2025 16:47:06 +0000

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

New comment by tekknolagi in "Introduction to Software Development Tooling (2024)"

tekknolagi — Wed, 17 Dec 2025 16:46:14 +0000

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

New comment by tekknolagi in "Introduction to Software Development Tooling (2024)"

tekknolagi — Wed, 17 Dec 2025 03:47:54 +0000

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

New comment by tekknolagi in "MIT Missing Semester 2026"

tekknolagi — Mon, 15 Dec 2025 15:36:40 +0000

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