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flat_array_map appears to be too slow when querying #87

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tzaeschke opened this issue Sep 12, 2022 · 2 comments
Open

flat_array_map appears to be too slow when querying #87

tzaeschke opened this issue Sep 12, 2022 · 2 comments
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tzaeschke commented Sep 12, 2022 •
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See #39. the flat_array_map appears to be too slow when querying compared to sparse_map. Confirm and fix.
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This may be related to TZCNT/CTZ not being compiled to a CPU instruction, see #103.

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-> Probably not CTZ, but somehow lower_bound seems quite expensive, even when done with TZCNT which should be just one cycle with -mbmi2.
is it maybe the waste of memory (due to allocating 2^k entries for usually to entries)? Or the non-linear access(?)?

@tzaeschke tzaeschke self-assigned this Dec 20, 2022
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