RFR: 8295282: Use Zicboz/cbo.zero to zero-out memory on RISC-V [v11]

[Fei Yang]

On Mon, 24 Oct 2022 08:20:13 GMT, Ludovic Henry <luhenry at openjdk.org> wrote:

>> src/hotspot/cpu/riscv/stubGenerator_riscv.cpp line 671:
>> 
>>> 669:   //      x29 < MacroAssembler::zero_words_block_size.
>>> 670: 
>>> 671:   address generate_zero_blocks() {
>> 
>> Could you please correct the comment at line #669 please? It looks to me that x29 is bigger than MacroAssembler::zero_words_block_size.
>
> With the loop "Clear the remaining blocks", `x29` will be smaller than `MacroAssembler::zero_words_block_size`.

I see. It is describing the output instead of input here. Thanks.

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