[lworld+fp16] RFR: 8334432: Refine Float16.fma

[Joe Darcy]

On Fri, 21 Jun 2024 04:36:52 GMT, Joe Darcy <darcy at openjdk.org> wrote:

> Adding comments and test cases for Float16.fma.

I've asked my colleague @rgiulietti to help with the error analysis of the current implementation.

The commented-out code in the fma for an inexact product-sum does get executed for the expected test cases. If special-case code for an inexact product-sum  turns out need to be needed, this extra code will be deleted before a push.

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PR Comment: https://git.openjdk.org/valhalla/pull/1143#issuecomment-2181985826