| -module(popcount_table). | |
| -export([gen_table/1]). | |
| gen_table(Bits) -> gen_table(1, 2 bsl (Bits - 1), {0}). | |
| gen_table(Stop, Stop, Table) -> Table; | |
| gen_table(Value, Stop, Table) -> | |
| New = (Value band 1) + erlang:element((Value bsr 1) + 1, Table), | |
| NewTable = erlang:append_element(Table, New), | |
| gen_table(Value + 1, Stop, NewTable). |
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