RFR: 8297445: PPC64: Represent Registers as values [v2]

[Richard Reingruber]

On Wed, 23 Nov 2022 15:41:32 GMT, Richard Reingruber <rrich at openjdk.org> wrote:

>> Martin Doerr has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update Copyright years.
>
> src/hotspot/cpu/ppc/register_ppc.hpp line 89:
> 
>> 87:   bool operator==(const Register rhs) const { return _encoding == rhs._encoding; }
>> 88:   bool operator!=(const Register rhs) const { return _encoding != rhs._encoding; }
>> 89:   const Register* operator->() const { return this; }
> 
> This is clever! Personally I'd be in favor of removing it in a cleanup change for simplicity.

Ah, it's also used in shared code (e.g. FrameMap::regname()) so cleanup is only possible after all ports represent Registers as values.

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PR: https://git.openjdk.org/jdk/pull/11297