BitMap::count_one_bits iterates over the words in the map and sums their population counts. Hacker's Delight (2nd Edition) refers to this as the "naive" method, and describes a more efficient method in Figure 5-7 and the surrounding text.
            
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                    JDK-8235551 BitMap::count_one_bits should use population_count -           
- Resolved
 
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                    JDK-8235714 BitMap::count_one_bits may count bits beyond unaligned end -           
- Resolved
 
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