RFR: 8262355: Support for AVX-512 opmask register allocation. [v8]

[Jatin Bhateja]

On Tue, 16 Mar 2021 13:03:29 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

>> Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8262355: Removing object re-materialization handling for mask-generating nodes during de-opt, it will be added separately.
>
> src/hotspot/cpu/x86/x86_64.ad line 3383:
> 
>> 3381: %}
>> 3382: 
>> 3383: operand kReg()
> 
> Should `kReg` operand exclude `k0` and `k1`?

k0  - signifies all true mask.

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PR: https://git.openjdk.java.net/jdk/pull/2768