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Mark bit32.count* RFC as implemented

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Arseny Kapoulkine 2021-12-03 11:10:41 -08:00 committed by GitHub
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rfcs/function-bit32-countlz-countrz.md
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Add bit32.countlz (count left zeroes) and bit32.countrz (count right zeroes) to accelerate bit scanning
**Status**: Implemented
## Motivation
All CPUs have instructions to determine the position of first/last set bit in an integer. These instructions have a variety of uses, the popular ones being: