RFR: 8262355: Support for AVX-512 opmask register allocation. [v11]

[Jatin Bhateja]

On Thu, 18 Mar 2021 03:35:44 GMT, Ningsheng Jian <njian at openjdk.org> wrote:

>> Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8262355: Review comments resolutions.
>
> src/hotspot/cpu/x86/x86_32.ad line 271:
> 
>> 269:     // curruption of value held in K1 register.
>> 270:     const_cast<RegMask*>(&_OPMASK_REG_mask)->Remove(OptoReg::as_OptoReg(k1->as_VMReg()));
>> 271:     const_cast<RegMask*>(&_OPMASK_REG_mask)->Remove(OptoReg::as_OptoReg(k1->as_VMReg()->next()));
> 
> Will changing your kReg operand by adding a new reg_class without k0/k1 or removing k0/k1 from opmask_reg (but keep in chunk2) be simpler?

This looks consistent with other mask modifications being done in reg_mask_init

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