RFR: 8268858: Determine register pressure automatically by the number of available registers for allocation [v2]

[Vladimir Kozlov]

On Thu, 17 Jun 2021 17:03:10 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> Joshua Zhu has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update comments and place test into proper location
>
> src/hotspot/cpu/aarch64/aarch64.ad line 2559:
> 
>> 2557:   // A call is considered a high register pressure area
>> 2558:   // and force spilling around the call.
>> 2559:   uint int_pressure_threshold = _NO_SPECIAL_REG32_mask.Size() - 1;
> 
> Explain in comment why `-1`.

This is not explanation. Comment should explain why with -1 the issue is fixed.

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PR: https://git.openjdk.java.net/jdk/pull/4505