[hooli42]

Hah, neat.

The 'weird' instructions can often be 3-4 orders of magnitude slower than arithmetic instructions, though I doubt that matters here.

[Validark]

CRC32 is the same speed as an integer multiply, going all the way back to Nehalem (2008). 3 cycles latency, and you can start a new one each cycle (or more than one, on Zen 5).

[hooli42]

Sure, in the same way SIMD instructions get a linear speedup in theory.

If you Google the words "CRC32 is slow", you can see hundreds of people complaining about this.