RFR: 8341137: Optimize long vector multiplication using x86 VPMUL[U]DQ instruction [v2]

[Sandhya Viswanathan]

On Fri, 8 Nov 2024 20:25:10 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

>> Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Creating specialized IR to shield pattern from subsequent transforms in optimization pipeline
>
> src/hotspot/share/opto/vectornode.cpp line 2132:
> 
>> 2130:   // Directly forward masked inputs if
>> 2131:   if (n->Opcode() == Op_AndV) {
>> 2132:      return n->in(1)->Opcode() == Op_Replicate ? n->in(2) : n->in(1);
> 
> This particular check should ensure that Replicate constant is `0xFFFFFFFF`.

Yes, this should ensure 0xFFFFFFFF.

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PR Review Comment: https://git.openjdk.org/jdk/pull/21244#discussion_r1835148834