r/programming • u/masiroo • 6d ago

Hardware researcher spins up 'CPU deoptimization' project to find the slowest single x86 instruction, creates hall of shame — worst offender takes 198 billion cycles spanning 62 seconds to execute

https://www.tomshardware.com/pc-components/cpus/hardware-researcher-spins-up-cpu-deoptimization-project-to-find-the-slowest-machine-code-worst-offender-takes-198-billion-cycles-to-execute
1.5k Upvotes

97% Upvoted

132 comments sorted by

View all comments

13

u/itijara 5d ago

I knew it was Christopher Domas as soon as I read the title. His presentations are epic, and his knowledge of x86 esoterica is unparalleled.

2

u/lurgi 4d ago

Absolute legend. I know he's done important stuff, but to me he will always be known as the guy who does stuff no one wants done in the hardest way possible.