Speaking of ARM, it has an rbit instruction which for some reason doesn't exist ... | Hacker News

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cozzyd on Sept 9, 2019 | parent | context | favorite | on: Popcount CPU instruction

Speaking of ARM, it has an rbit instruction which for some reason doesn't exist on x86.

saagarjha on Sept 9, 2019 [–]

Apparently x86 isn't "web scale" enough to have to deal with endianness ;)

gpderetta on Sept 9, 2019 | [–]

It is not really about endianness. The instruction reverses bits not bytes. IIRC is needed as a required step of FFT.

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