RFR: 8307495: Specialize atomic bitset functions for aix-ppc [v6]

[Martin Doerr]

On Fri, 10 Oct 2025 08:02:06 GMT, Richard Reingruber <rrich at openjdk.org> wrote:

>> David Briemann has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   cast compare_value to unsigned
>
> src/hotspot/cpu/ppc/atomicAccess_ppc.hpp line 186:
> 
>> 184:     : [dest]            "b"     (dest),
>> 185:       [exchange_value]  "r"     (exchange_value),
>> 186:                         "m"     (*dest)
> 
> The memory operands with constraint 'm' are unused. I think the intent was to express that `dest` is dereferenced to read and write memory at that location. But that's expressed with `memory` in the `clobber` section.
> These operands should be removed.

Do you know what "b" means? We use "r" at other places.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27650#discussion_r2419037761