Comments (4)
Hi @touisteur,
At this time this feature does not exist. Maybe you can use mipp::sum
as a work around until I implement the popcount
.
Hope it helps.
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a look at https://github.com/kimwalisch/libpopcnt might be interesting - although i would think, there are different goals:
- libpopcnt is targeted for big data sizes
- mipp IMHO should target inlined code for simple data types
@kouchy : don't see how mipp::sum
could be any workaround?!
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@hayguen I guess, you would use LUT to convert each byte/nibble to a number of set bits in it, then shuffle/permute and sum till you reach your lane width. Some libraries even do it recursively and optimizer unwinds it quite nicely.
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@yzazik i had found my non-simd solution at https://graphics.stanford.edu/~seander/bithacks.html
specifically https://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel , if i remind right
benchmarks showed, that it's very near to CPU intrinsic on x64
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