On Wed, 2 Oct 2024 10:31:09 GMT, fabioromano1 <d...@openjdk.org> wrote:
> After changing `BigInteger.sqrt()` algorithm, this can be also used to speed > up `BigDecimal.sqrt()` implementation. Here is how I made it. > > The main steps of the algorithm are as follows: > first argument reduce the value to an integer using the following relations: > > x = y * 10 ^ exp > sqrt(x) = sqrt(y) * 10^(exp / 2) if exp is even > sqrt(x) = sqrt(y*10) * 10^((exp-1)/2) is exp is odd > > Then use BigInteger.sqrt() on the reduced value to compute the numerical > digits of the desired result. > > Finally, scale back to the desired exponent range and perform any adjustment > to get the preferred scale in the representation. This pull request has now been integrated. Changeset: c4c3edfa Author: fabioromano1 <51378941+fabioroma...@users.noreply.github.com> Committer: Raffaello Giulietti <rgiulie...@openjdk.org> URL: https://git.openjdk.org/jdk/commit/c4c3edfa964ef504f12971c5deef7c7355bdf325 Stats: 453 lines in 2 files changed: 226 ins; 187 del; 40 mod 8341402: BigDecimal's square root optimization Reviewed-by: rgiulietti ------------- PR: https://git.openjdk.org/jdk/pull/21301
