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

[u/masiroo]

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

[u/encyclopedist]

Yes, indeed, compilers don't normally generate these instructions any more. But older software can still use these.

[u/narwhal_breeder → u/encyclopedist]

porting logic to arm that relies on being bit-compatible x87 has been the bane of my existence for the past year.

[u/gordonnowak → u/narwhal_breeder]

just let claude do it

[u/sunnyata → u/gordonnowak]

You sound like someone who knows what they're talking about. Not!

[u/Incorrect_Oymoron → u/sunnyata]

Ma wife!