RFR: 8346931: Replace divisions by zero in sharedRuntimeTrans.cpp [v2]

[Kim Barrett]

On Fri, 21 Mar 2025 15:58:08 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> FYI, the code in question looks to be HotSpot-internal copies of FDLIBM code or similar. A coding pattern used in FDLIBM and other math libraries is to have an expression evaluate to a non-finite value (NaN or an infinity) rather than directly returning a NaN or infinity so that the IEEE 754 sticky flag state can be set, such as divide by zero or invalid.
> 
> The Java floating-point model, both at the JVM and language level, excludes sticky flags so preserving the sticky flag side-effects is not necessary.

The (conditional) use of `NAN` seems like it already broke that pattern a long time ago.  Fortunately, we don't care.

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PR Comment: https://git.openjdk.org/jdk/pull/24136#issuecomment-2746962873