#13352: Running time improvement of the bitset_len method
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Reporter: dcoudert | Owner: jason
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.3
Component: misc | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: David Coudert | Merged in:
Dependencies: | Stopgaps:
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Comment (by leif):
I'd rather "implement" the functions in C (where you can use the C
preprocessor and `__builtin_popcount()` if available) and write a thin
Cython wrapper.
GCC e.g. chooses efficient machine implementations (probably a single
instruction), depending on the (configured or specified) target and
perhaps also further compiler flags.
Note that GMP has functions like `mpz_popcount()` for `mpz_t`s as
well.[[BR]]
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Not sure what the `parallel` refers to ... ;-)
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13352#comment:2>
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