Notices by John Regehr (regehr@mastodon.social)

compiler IR design is difficult and there are many subtleties. Nikita Popov talks about a few aspects of this for LLVM.

https://www.youtube.com/watch?v=gIQEZ3QJz1w

these are my two favorite graphs

@whitequark I have super fond memories of running my embedded systems class using boards with arm7tdmi. back when embedded boards were embedded, and not 8-core linux machines.

@whitequark appropriate since arm7tdmi is about as old as the bible

@whitequark @ironiridis not really

@whitequark they're mostly academic projects so....

Tesla material is really jaw-dropping. even without the nazi CEO this company needs to be put out of business immediately

https://pluralistic.net/2025/04/15/musklemons/#more-like-edison-amirite

not as dramatic as burning a library but just as effective

@void_friend it's too bad that 99% of these C quizzes are more of "guess which UB the author means you to find" instead of "find the UB"

argh... I pretty recently switched from chrome to firefox on the two devices I use the most. what are we supposed to do now, dig up hotjava? lynx??

(and wow I just noticed that opera is still maintained. does anyone actually use it?)

https://securityonline.info/mozillas-new-terms-firefox-to-collect-user-data/

just a heads-up for anyone who works with an ABET-accredited university program: ABET is pathetic

https://info.abet.org/abet-important-message-from-abet-president-and-ceo

last Christmas my parents got us an air filter that we usually leave running now. it has an air quality sensor and it's incredible how fast it goes from "totally good" to "seriously shitty" when one of us runs a gas burner for a while. I mean, I knew it was bad, but ugh

@ricci @palvaro I don't remember that! must have been a long time ago. anyhow, I like Matt, or did some years ago when I last talked to him.

other day I was showing a student something on my machine and he got all quiet. I figured he was digesting the deep thoughts, then he says "so you really just use emacs all the time?"

someone on reddit did this

@andhow @snopes @torproject yesterday it was time to bail from X two years ago

@jrose @steve @porglezomp @bob there’s -Og now

C and C++ people: I'm looking for an example -- for a target the supports unaligned memory operations -- where code that violates language-level memory alignment requirements is *not* compiled into something that works as one would naively expect.

I vaguely remember people (almost certainly including @void_friend) discussing this some time ago, but I can't find the posts, argh

@jripley yeah! one of the blog posts I linked is that exact scenario

the CS:APP "bomb lab" has to be among the greatest computer science homework assignments ever developed. I'm releasing it to my students tomorrow. so fun!!!

http://csapp.cs.cmu.edu/3e/bomblab.pdf