RFR: 8265956: JVM crashes when matching LShiftVB Node [v2]

[Xiaohong Gong]

On Thu, 29 Apr 2021 08:58:35 GMT, Xiaohong Gong <xgong at openjdk.org> wrote:

>> Wang Huang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   add m4 file
>
> src/hotspot/cpu/aarch64/aarch64_neon.ad line 5292:
> 
>> 5290:             n->as_Vector()->length() == 8);
>> 5291:   match(Set dst (LShiftVB src (LShiftCntV shift)));
>> 5292:   match(Set dst (LShiftVB src shift));
> 
> Does it make sense if changing the mid-end codes to make sure the immediate shift is broadcasted to a vector?

This could avoid fixing the missing rules for all related architecture.

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PR: https://git.openjdk.java.net/jdk/pull/3747