RFR: 8322768: Optimize non-subword vector compress and expand APIs for AVX2 target. [v5]

[Jatin Bhateja]

On Mon, 15 Jan 2024 09:10:38 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Using emulated variable blend E-Core optimized instruction.
>
> src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp line 5309:
> 
>> 5307:     assert(bt == T_LONG || bt == T_DOUBLE, "");
>> 5308:     vmovmskpd(rtmp, mask, vec_enc);
>> 5309:     shlq(rtmp, 5); // for 64 bit rows (4 longs)
> 
> Suggestion:
> 
>     shlq(rtmp, 5); // for 32 bit rows (4 longs)

Each long/double permute lane holds 64 bit value.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17261#discussion_r1452967063