रञ्जित (Ranjit Mathew)

Why do #compilers exploit the #UndefinedBehavior of signed overflows in #C?

Fabian Giesen explains:

https://gist.github.com/rygorous/e0f055bfb74e3d5f0af20690759de5a7

#Programming #UB #Optimization #PLDI #InductionVariable #Loops #Performance #InnerLoop

A bit of background on compilers exploiting signed overflow

A bit of background on compilers exploiting signed overflow - gist:e0f055bfb74e3d5f0af20690759de5a7

Gist
Dec 5, 2021 at 3:08amMastodon for iOS
Show threadरञ्जित (Ranjit Mathew)Dec 5, 2021

“How ISO-C Became Unusable For Operating System Development”, Victor Yodaiken, PLOS 2021 (https://www.yodaiken.com/2021/10/06/plos-2021-paper-how-iso-c-became-unusable-for-operating-system-development/).

On HN: https://news.ycombinator.com/item?id=28779036

#C #Programming #PLDI #UB #UndefinedBehavior #Compilers #Overflows #OSDev #SystemsProgramming #Performance #Optimization #Paper

PLOS 2021 paper: How ISO-C became unusable for operating system development – keeping simple

keeping simple
Show threadरञ्जित (Ranjit Mathew)Dec 5, 2021

“Undefined Behavior Deserves A Better Reputation”, Ralf Jung (https://www.ralfj.de/blog/2021/11/18/ub-good-idea.html).

“Do We Really Need Undefined Behavior?”, Ralf Jung (https://www.ralfj.de/blog/2021/11/24/ub-necessary.html).

Via HN: https://news.ycombinator.com/item?id=29435263

#UB #UndefinedBehavior #Programming #Compilers #Performance #PLDI #Optimization

Undefined Behavior deserves a better reputation

This is a cross-post of an article that I wrote for the SIGPLAN blog. “Undefined Behavior” often has a bad reputation. People see it as an excuse compiler writers use to break code, or an ...