Hacker News: csjh

New comment by csjh in "You are not your job"

csjh — Mon, 23 Mar 2026 16:02:33 +0000

maybe it implies some amount of "live to work" etymologically, but the word "living" in that context specifically refers to living in the financial sense (the act of living wouldn't really make sense in that sentence)

you live to play video games and watch movies, but you make a living by working

New comment by csjh in "Show HN: The Mog Programming Language"

csjh — Mon, 09 Mar 2026 21:13:31 +0000

Wasm is explicitly not designed for interpretation (https://arxiv.org/abs/2205.01183)

New comment by csjh in "Allocating on the Stack"

csjh — Fri, 27 Feb 2026 20:34:39 +0000

Optimizations like these are so cool. I love seeing higher level languages take advantage of their high level-ness

New comment by csjh in "Allocating on the Stack"

csjh — Fri, 27 Feb 2026 20:32:35 +0000

What do you mean outside of programmer control? What's stopping you from setting the stack size in the linker flags?

New comment by csjh in "Nano Banana 2: Google's latest AI image generation model"

csjh — Thu, 26 Feb 2026 16:34:21 +0000

What’s the downside of SynthID?

New comment by csjh in "100M-Row Challenge with PHP"

csjh — Wed, 25 Feb 2026 16:42:45 +0000

Obligatory DuckDB solution:

> duckdb -s "COPY (SELECT url[20:] as url, date, count(*) as c FROM read_csv('data.csv', columns = { 'url': 'VARCHAR', 'date': 'DATE' }) GROUP BY url, date) TO 'output.json' (ARRAY)"

Takes about 8 seconds on my M1 Macbook. JSON not in the right format, but that wouldn't dominate the execution time.

New comment by csjh in "How many registers does an x86-64 CPU have? (2020)"

csjh — Sat, 14 Feb 2026 17:04:55 +0000

You’re missing the fact that the compiler isn’t forced to fill every register in the first place. If it was less efficient to use more registers, the compiler simply wouldn’t use more registers.

The actual counter proof here would be that in either case, the temporaries have to end up on the stack at some point anyways, so you’d need to look at the total number of loads/stores in the proximity of the call site in general.

New comment by csjh in "Ask HN: What Are You Working On? (June 2025)"

csjh — Mon, 30 Jun 2025 02:36:16 +0000

Started on a dependency-free (including manual object file creation, excluding manual linker) single-pass C compiler with a goal of it being self-hosting. Spawned after my previous project (single-pass Wasm JIT) started to plateau a bit and wanted to start something more "full-stack compiler"-y.

https://github.com/csjh/c-liva

New comment by csjh in "Low-Level Optimization with Zig"

csjh — Sat, 07 Jun 2025 22:34:08 +0000

Maybe, but from the author's description, it seems like the interpretation of intent that they want is to generally give the most information possible to the compiler, so it can do its thing. I don't see why the right high level language couldn't give the compiler plenty of leeway to optimize.

New comment by csjh in "Low-Level Optimization with Zig"

csjh — Sat, 07 Jun 2025 19:26:41 +0000

> High level languages lack something that low level languages have in great adundance - intent.

Is this line really true? I feel like expressing intent isn't really a factor in the high level / low level spectrum. If anything, more ways of expressing intent in more detail should contribute towards them being higher level.

New comment by csjh in "Ask HN: What are you working on? (May 2025)"

csjh — Mon, 26 May 2025 18:50:32 +0000

Appreciated, but not sure I'm ready for that yet - still need to finish uni :p

New comment by csjh in "Ask HN: What are you working on? (May 2025)"

csjh — Mon, 26 May 2025 16:31:39 +0000

Been working on a single-pass WebAssembly JIT compiler (atm only guaranteed to work on M1 air), been super interesting learning and thinking through strategies to balance fast compilation & fast generated code. It's the fastest single-pass JIT output-wise that I'm aware of, but the compilation speed could use some work.

Also: the README is pretty outdated, the real interesting stuff happens in https://github.com/csjh/mitey-jit/blob/main/backend/arm64/ba...

https://github.com/csjh/mitey-jit

New comment by csjh in "The DuckDB Local UI"

csjh — Wed, 12 Mar 2025 14:39:52 +0000

for the average developer I think the killer feature is allowing you to query over whatever data you want (csv, json, parquet, even gsheets) as equals, directly from their file form - can even join across them

New comment by csjh in "Performance of the Python 3.14 tail-call interpreter"

csjh — Mon, 10 Mar 2025 17:59:57 +0000

distributing the dispatch instructions lets the predictor pick up on specific patterns within the bytecode - for example, comparison instructions are probably followed by a conditional branch instruction

New comment by csjh in "I Wrote a WebAssembly VM in C"

csjh — Thu, 06 Feb 2025 02:39:06 +0000

How's it nondeterministic?

New comment by csjh in "DOJ will push Google to sell off Chrome"

csjh — Mon, 18 Nov 2024 23:19:56 +0000

That's not true, plenty of great stuff is shipping every year. Take your pick: https://web.dev/series/baseline-newly-available https://web.dev/blog/baseline2023

The Common CPU Interpreter Loop Revisited (2008)

csjh — Sun, 17 Nov 2024 19:25:10 +0000

Article URL: http://www.emulators.com/docs/nx25_nostradamus.htm

Comments URL: https://news.ycombinator.com/item?id=42166360

Points: 3

# Comments: 0

New comment by csjh in "Ask HN: What Are You Working On? (October 2024)"

csjh — Mon, 28 Oct 2024 14:28:08 +0000

Been interested in programming language implementations recently, so I'm working on an in-place WebAssembly interpreter

Currently passes all the WebAssembly 1.0 test suite minus the tests that require imports (around 9) - should have those ones fixed this week

https://github.com/csjh/wasm-interpreter

New comment by csjh in "WebP: The WebPage Compression Format"

csjh — Sat, 07 Sep 2024 19:16:46 +0000

I think the most surprising part here is the gzipped-base64'd-compressed data almost entirely removes the base64 overhead.

New comment by csjh in "Ask HN: What are you working on (August 2024)?"

csjh — Sun, 25 Aug 2024 02:02:00 +0000

I'm working on a serialization format, somewhat based on apache arrow but row-based. Includes end to end typescript type safety, and significantly faster than JSON in serialization and deserialization. Seems to do fairly well in the native version I threw together, but more of a javascript/typescript operation for now.

https://github.com/csjh/pest