RFR: 8295282: Use Zicboz/cbo.zero to zero-out memory on RISC-V [v16]

[Ludovic Henry]

On Tue, 25 Oct 2022 04:00:59 GMT, Fei Yang <fyang at openjdk.org> wrote:

>> Ludovic Henry has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix cbo_zero encoding
>
> src/hotspot/cpu/riscv/assembler_riscv.hpp line 2749:
> 
>> 2747:   INSN(prefetch_i, 0b0000000000000);
>> 2748:   INSN(prefetch_r, 0b0000000000001);
>> 2749:   INSN(prefetch_w, 0b0000000000010);
> 
> Opcode for prefetch_w is wrong?

Fixed.

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PR: https://git.openjdk.org/jdk/pull/10718