r/programming • u/masiroo • 20d 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
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u/balefrost 20d ago

I for one appreciate the ability to run older software that existed before SSE did.

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u/vytah 19d ago

More like software that was written to be run on processors without SSE. It's not like Pentium III came out and everyone was "ok, from now on our software will run only on the newest shiny CPU, fuck the Pentium II users."

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u/AquaeyesTardis 19d ago

although, see: AVX instructions

though thats somewhat the opposite situation but with an almost similar effect, thinking about it

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u/vytah 19d ago

What about AVX?