Java中的快速sqrt以牺牲精度为代价 [英] Fast sqrt in Java at the expense of accuracy

问题描述

我正在寻找Java中的快速平方根实现，用于输入范围为[0,2 * 10 ^ 12]的双值。对于此范围内的任何值，精度应小于5位小数。换句话说，结果可能与5位小数后的 Math.sqrt（）方法不同。但是，此方法需要比 Math.sqrt（）快得多。

I am looking for a fast square root implementation in Java for double values in the input range of [0, 2*10^12]. For any value in this range, the precision should be upto 5 decimal places. In other words, the result can differ from the Math.sqrt() method after 5 decimal places. However, this method needs to be much faster than Math.sqrt().

任何想法？谢谢！

推荐答案

我不相信（没有基准来证明这是错误的）纯Java实现可以比 Math.sqrt（）快得多。 Oracle JRE实施和 OpenJDK实现是本机实现。

I don't believe (without a benchmark to prove this wrong) that a pure Java implementation could me much faster than Math.sqrt(). Both the Oracle JRE implementation and the OpenJDK implementation are native implementations.

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