RFR: JDK-8331859 : [PPC64] Remove support for Power7 and older [v4]

[Martin Doerr]

On Thu, 17 Apr 2025 16:23:03 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Suchismith Roy has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 27 commits:
>> 
>>  - Merge branch 'openjdk:master' into power8
>>  - mfdscr removal
>>  - indents
>>  - indents
>>  - mcpu flag
>>  - superword
>>  -  further cleanup
>>  - clean of power 7 instructions
>>  - Removal of older P7 Instructions
>>  - Removal of older P7 Instructions
>>  - ... and 17 more: https://git.openjdk.org/jdk/compare/1138a186...4aa520c2
>
> src/hotspot/cpu/ppc/macroAssembler_ppc.cpp line 4238:
> 
>> 4236:                                      : StubRoutines::crc_table_addr()   , R0);
>> 4237: 
>> 4238:   kernel_crc32_vpmsum(crc, buf, len, t0, t1, t2, t3, t4, t5, t6, t7, !is_crc32c);
> 
> `kernel_crc32_1word` is now dead and should be removed completely.

Please also remove it from the .hpp file.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20262#discussion_r2091104322