RFR: 8294194: [AArch64] Create intrinsics compress and expand [v2]

[Stuart Monteith]

On Tue, 1 Nov 2022 08:41:40 GMT, Andrew Haley <aph at openjdk.org> wrote:

>> Stuart Monteith has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update src/hotspot/cpu/aarch64/aarch64.ad
>>   
>>   Correct slight formatting error.
>>   
>>   Co-authored-by: Eric Liu <eric.c.liu at arm.com>
>
> src/hotspot/cpu/aarch64/aarch64.ad line 16952:
> 
>> 16950:   format %{ "mov    $tsrc, $src\n\t"
>> 16951:             "mov    $tmask, $mask\n\t"
>> 16952:             "bext   $tdst, $tsrc, $tmask\t# parallel bit extract\n\t"
> 
> We don't need to tell readers what BEXT does.;

I can remove that - it is just to match the equivalent x86 code. My actual preference would be to emit the method the intrinsic was replacing.

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PR: https://git.openjdk.org/jdk/pull/10537