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I've been asked on the RISC-V B extension mailing list to write a function that receives a byte and returns a 32 bit word with the indices of the set bits of the byte in its nibbles (aligned to LSB end), with unused MSB nibbles set to zero (LSB bit in input has index 1).pic.twitter.com/50Ei1XFEVr
I already had a similar example that calculates the bitwise prefix sum of a byte and stores the result vector in the nibbles of a 32 bit word. But this has been posited to be more useful. Idk. ;) In case you don't know what this is about:https://github.com/riscv/riscv-bitmanip …
Posts like this make me miss sharing a spacetime coordinate with you, always interesting. :-)
I would use a 256 entry lookup table for that :-)
What would you do for 16 bit -> 64 bit? (I know, same table and pcnt+shift+or to combine the results would work. But that's sooo boring. ;) And also probably approaching the point where my solution is always faster, depending on speed of your bext implementation.)
you can also replace your two shifts/or pairs with a mul with constant 0x0f I guess.
Oh, yes, of course! Thanks. I think I will do that.
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