RFR: 8292898: [vectorapi] Unify vector mask cast operation [v4]

[Jatin Bhateja]

On Tue, 27 Sep 2022 02:16:48 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> src/hotspot/cpu/x86/x86.ad line 8414:
>> 
>>> 8412:   predicate(Matcher::vector_length(n) == Matcher::vector_length(n->in(1)) &&
>>> 8413:             Matcher::vector_length_in_bytes(n) != Matcher::vector_length_in_bytes(n->in(1)) &&
>>> 8414:             (UseAVX >= 2 ||
>> 
>> Pattern looks relevant only for UseAVX=2
>
> Do you mean the mask is using k register when `UseAVX > 2` ?

UseAVX > 2 signifies AVX512 target where carrier of all currently valid mask IR nodes is an opmask register.

-------------

PR: https://git.openjdk.org/jdk/pull/10192