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Add "integer square root" method to integer primitive types by Federic...
source link: https://github.com/rust-lang/rust/pull/116176
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For every suffix N among 8, 16, 32, 64, 128 and size, this PR adds the methods
const fn uN::isqrt() -> uN;
const fn iN::isqrt() -> iN;
const fn iN::checked_isqrt() -> Option<iN>;to compute the integer square root, addressing issue #89273.
The implementation is based on the base 2 digit-by-digit algorithm on Wikipedia, which after some benchmarking has proved to be faster than both binary search and Heron's/Newton's method. I haven't had the time to understand and port this code based on lookup tables instead, but I'm not sure whether it's worth complicating such a function this much for relatively little benefit.
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