RFR: 8305895: Implement JEP 450: Compact Object Headers (Experimental) [v6]

[Fei Yang]

On Fri, 23 Aug 2024 18:42:28 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> Roman Kennke has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix bit counts in GCForwarding
>
> src/hotspot/cpu/riscv/c1_MacroAssembler_riscv.cpp line 170:
> 
>> 168:   mv(tmp1, (int32_t)(intptr_t)markWord::prototype().value());
>> 169:   sd(tmp1, Address(obj, oopDesc::mark_offset_in_bytes()));
>> 170: // Todo UseCompactObjectHeaders
> 
> Can I ask, will this pr fullly support riscv?

@Hamlin-Li : AFAIK, porting to linux-riscv platform has NOT been started yet. To avoid duplicate work, please let me know if anyone is interested or has been working on it :-)

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PR Review Comment: https://git.openjdk.org/jdk/pull/20677#discussion_r1732153574