> 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.
fabioromano1 has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 36 additional commits since the last revision: - Merge branch 'openjdk:master' into patchBigDecimalSqrt - An optimization - Refine documentation - Speed up computation of bitLength() - An optimization - Make digitLengthLower() static - Optimization for integer BigDecimals detection - Optimized integer BigDecimals detection - Added test for scale overflow - Added tests for exact results path - ... and 26 more: https://git.openjdk.org/jdk/compare/c08217cb...378569c5 ------------- Changes: - all: https://git.openjdk.org/jdk/pull/21301/files - new: https://git.openjdk.org/jdk/pull/21301/files/331f7948..378569c5 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=21301&range=31 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21301&range=30-31 Stats: 534009 lines in 11706 files changed: 281778 ins; 194143 del; 58088 mod Patch: https://git.openjdk.org/jdk/pull/21301.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/21301/head:pull/21301 PR: https://git.openjdk.org/jdk/pull/21301
