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A comment on Did any processor implement an integer square root instruction?. Parent comment
See for example https://math.mit.edu/~stevenj/18.335/newton-sqrt.pdf
The initial guess is the approximate square root, but it needs to be halved as part of the calculation.
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See for example https://math.mit.edu/~stevenj/18.335/newton-sqrt.pdf
The initial guess is the approximate square root, but it needs to be halved as part of the calculation.