A test for whether the target system had popcount.
What did you see instead?
Four separate tests per unrolled loop, and the tests repeating every time through the loop.
This seems like it should be a cacheable result. It might even be worth generating two copies of the loop; the cost of all those branches is large, and doing a single branch up front would be nicer. I don't think there's any facility available to me to let me write the branch in my own code.
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