RFR: 8329331: Intrinsify Unsafe::setMemory [v11]

[Sandhya Viswanathan]

On Thu, 11 Apr 2024 20:58:00 GMT, Scott Gibbons <sgibbons at openjdk.org> wrote:

>> src/hotspot/cpu/x86/stubGenerator_x86_64_arraycopy.cpp line 735:
>> 
>>> 733: 
>>> 734:   if (MaxVectorSize == 64) {
>>> 735:     UnsafeCopyMemoryMark ucmm(this, !is_oop && !aligned, false, ucme_exit_pc);
>> 
>> This is not related to Unsafe::setMemory?
>
> No.  Reviewing the code I saw this as a potential error, as `arraycopy_avx3_large` could cause a SIGBUS which wouldn't be caught.  It conforms to the other instances of copy in the code.  I think it was missed by the original developer.

Would be good to do it in a separate PR then.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18555#discussion_r1561801825