bit count : Java Glossary

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bit count
The number of = 1 bits in a number. Here are two ways to calculate it. The collapsing partial parallel sums method looks horribly complicated but it works 5 times faster than the classic method. Here is the partial sum collapsing method:
Here
Here is an algorithm what works quickly when there are only a few bits turned on.
binary
power
Tim Tyler’s Bit Utilities
width in bits
width in digits
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