RFR: 8318158: RISC-V: implement roundD/roundF intrinsics [v2]

[Andrew Haley]

On Mon, 13 Nov 2023 09:23:20 GMT, Vladimir Kempik <vkempik at openjdk.org> wrote:

> I have consulted with our h/w team and they told me next: multi-issue FP Unit can process few (data-independent) fp instructions at a time, even if they have different rounding mode. The only issue is when the rounding mode is set to dynamic rounding (aka get it from csr), but it's not our case here

OK. Do what you will, but you're coding for an architecture not an implementation, and this code may stand for many years.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16382#discussion_r1390834630