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

[Stuart Monteith]

On Tue, 1 Nov 2022 08:46:55 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 2299:
> 
>> 2297:     case Op_ExpandBits:
>> 2298:     case Op_CompressBits:
>> 2299:       if (!(UseSVE > 1 && VM_Version::supports_svebitperm())) {
> 
> Do we need to test `UseSVE` here?

We don't want to enable this on detection of the feature - if UseSVE is disable, we'll be missing the SVE infrastructure that we are dependent on in the compiler.

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