RFR: 8282664: Unroll by hand StringUTF16 and StringLatin1 polynomial hash loops [v9]

[Claes Redestad]

On Wed, 9 Nov 2022 02:35:24 GMT, David Schlosnagle <duke at openjdk.org> wrote:

>> Claes Redestad has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 55 commits:
>> 
>>  - Revert accidental ModuleHashes change
>>  - Merge branch 'master' into 8282664-polyhash
>>  - Merge pull request #2 from luhenry/dev/cl4es/8282664-polyhash
>>    
>>    Unroll + Reorder BBs
>>  - fixup! Handle size=0 and size=1 in Java
>>  - Handle size=0 and size=1 in Java
>>  - reorder BB to do single scalar first to avoid slowdown of short arrays, longer arrays jumps will be amortized by speedups
>>  - Unroll loop for cnt1 < 32
>>  - Merge pull request #1 from luhenry/dev/cl4es/8282664-polyhash
>>    
>>    Switch to forward approach for vectorization
>>  - Fix vector loop
>>  - fix indexing
>>  - ... and 45 more: https://git.openjdk.org/jdk/compare/dd5d4df5...853a7575
>
> src/hotspot/share/opto/matcher.cpp line 1707:
> 
>> 1705:   if (x >= _LAST_MACH_OPER) {
>> 1706:     fprintf(stderr, "x = %d, _LAST_MACH_OPER = %d\n", x, _LAST_MACH_OPER);
>> 1707:     fprintf(stderr, "dump n\n");
> 
> Should this be removed before merging?
> Suggestion:

Yes, fixed these in the latest version.

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PR: https://git.openjdk.org/jdk/pull/10847