Amdahl's law, 55 years later

Posted Nov 1, 2025 14:32 UTC (Sat) by khim (subscriber, #9252)
In reply to: Amdahl's law, 55 years later by WolfWings
Parent article: Ubuntu introduces architecture variants

AVX512 would have been great if Intel wouldn't have bombed its introduction so badly. Today you may expect AVX512 from AMD in consistent fashion, but not from Intel.

This is extremely stupid, but hey, that's Intel for you.

Amdahl's law, 55 years later

Posted Nov 1, 2025 22:18 UTC (Sat) by WolfWings (subscriber, #56790) [Link]

I mean... they also introduced a niche instruction in AVX-512 that they implemented SO BADLY that other instructions could reproduce the same effect even faster, to the point Intel has deprecated the instruction.

AMD's implementation? 1 VP2INTERSECT per clock cycle as of Zen5, where Intel is was over 25 clock cycles.