RFR: 8302191: Performance degradation for float/double modulo on Linux

[Jan Kratochvil]

On Fri, 10 Feb 2023 09:06:56 GMT, Jan Kratochvil <duke at openjdk.org> wrote:

> I have OCA already processed/approved. I am not Author but my Author request is being processed these days (sent to Rob McKenna).
> I did regression test x86_64 OpenJDK-8. I will leave other regression testing on GHA.
> The patch (and former GCC performance regression) affects only x86_64+i686.

Yes, I suspect GCC found it was incorrect. I did not find a countercase why it was incorrect but I plan to leave that up to GCC developers.

Yes,  I believe I have checked all the cornercases that the `fprem` does provide exactly what OpenJDK VM expects.

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PR: https://git.openjdk.org/jdk/pull/12508