Digit Serial Methods with Applications to Division and Square Root (with mechanically checked correctness proofs)

Warren E. Ferguson, Jesse Bingham, Levent Erkök, John R. Harrison, Joe Leslie-Hurd

We present a generic digit serial method (DSM) to compute the digits of a real number $V$ . Bounds on these digits, and on the errors in the associated estimates of $V$ formed from these digits, are derived. To illustrate our results, we derive such bounds for a parameterized family of high-radix algorithms for division and square root. These bounds enable a DSM designer to determine, for example, whether a given choice of parameters allows rapid formation and rounding of its approximation to $V$. All our claims are mechanically verified using the HOL-Light theorem prover, and are included in the appendix with commentary.

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