[jdk16] RFR: 8260585: AArch64: Wrong code generated for shifting right and accumulating four unsigned short integers [v3]

[Ningsheng Jian]

On Sun, 31 Jan 2021 10:30:06 GMT, Dong Bo <dongbo at openjdk.org> wrote:

>> This is a typo introduced by JDK-8255949.
>> Compiler will generate `ushr` for shifting right and accumulating four short integers.
>> It produces wrong results for specific case. The instruction should be `usra`.
>
> Dong Bo has updated the pull request incrementally with one additional commit since the last revision:
> 
>   make empty ins_encode when shift >= 16 (chars)

Looks good to me.

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Marked as reviewed by njian (Committer).

PR: https://git.openjdk.java.net/jdk16/pull/136