RFR: 8342884: RISC-V: verify float <--> float16 conversion [v2]

[Hamlin Li]

On Thu, 24 Oct 2024 00:11:21 GMT, Fei Yang <fyang at openjdk.org> wrote:

> Nit: Better to move it out of the `EXPERIMENTAL` group. Maybe immediately after the line for `UseZfh`.
> 

Currently the pattern is ordering by name, so I'd prefer to keep it. :)

> (Seems we should also auto-enable this feature through hwprobe like other non-experimental flags. I see macros `RISCV_HWPROBE_EXT_ZVFH` and `RISCV_HWPROBE_EXT_ZVFHMIN` in file os_cpu/linux_riscv/riscv_hwprobe.cpp, but neither of them are checked in function `RiscvHwprobe::add_features_from_query_result`)

Thanks, add test of RISCV_HWPROBE_EXT_ZVFH, but not RISCV_HWPROBE_EXT_ZVFHMIN, as we don't have the corresponding define and usage ext_Zvfhmin and so on.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21664#discussion_r1814592635