RFR: 8202449: overflow handling in Random.doubles [v3]

[Joe Darcy]

On Tue, 24 May 2022 12:58:45 GMT, Raffaello Giulietti <duke at openjdk.java.net> wrote:

>> Extend the range of Random.doubles(double, double) and similar methods.
>
> Raffaello Giulietti has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8202449: overflow handling in Random.doubles

Marked as reviewed by darcy (Reviewer).

src/java.base/share/classes/jdk/internal/util/random/RandomSupport.java line 733:

> 731:                 /* avoids overflow at the cost of 3 more multiplications */
> 732:                 float halfOrigin = 0.5f * origin;
> 733:                 r = (r * (0.5f * bound - halfOrigin) + halfOrigin) * 2.0f;

This could be done in double arithmetic, but I think it is better to keep it in float arithmetic for similarity with the code in the double version of the method.

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PR: https://git.openjdk.java.net/jdk/pull/8791