RFR: 8320347: Emulate vblendvp[sd] on ECore [v2]

[Sandhya Viswanathan]

On Tue, 21 Nov 2023 18:10:30 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

>> Volodymyr Paprotski has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
>> 
>>  - Merge remote-tracking branch 'jdk/master' into vp-ecore2
>>  - review comments
>>  - emulate vblend on ecores
>
> src/hotspot/cpu/x86/x86.ad line 7840:
> 
>> 7838:   match(Set dst (VectorBlend (Binary src1 src2) mask));
>> 7839:   format %{ "vector_blend  $dst,$src1,$src2,$mask\t! using $vtmp as TEMP" %}
>> 7840:   effect(TEMP vtmp, TEMP dst);
> 
> TEMP dst can be removed.

TEMP dst is needed because otherwise register allocator can allocate dst and vtmp to be same. The vpand will then overwrite vtmp.

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PR Review Comment: https://git.openjdk.org/jdk/pull/16716#discussion_r1401041831