>I think x86 has like pshufb for LUTs There is also VPERMI2B [0] which operates ... | Hacker News

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protomolecule on March 13, 2024 | parent | context | favorite | on: Building Meta's GenAI infrastructure

>I think x86 has like pshufb for LUTs

There is also VPERMI2B [0] which operates on a 128 byte LUT.

[0] https://en.wikichip.org/wiki/x86/avx512_vbmi

danielhanchen on March 13, 2024 [–]

Oh I forgot about that!! But ye LUTs are very interesting and fascinating :) One of the hidden gems of CPU optimizations :)

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