[jdk17u-dev] RFR: 8309254: Implement fast-path for ASCII-compatible CharsetEncoders on RISC-V [v2]

[Fei Yang]

On Fri, 11 Aug 2023 02:36:29 GMT, Dingli Zhang <dzhang at openjdk.org> wrote:

>> I would like to backport [JDK-8309254](https://bugs.openjdk.org/browse/JDK-8309254). 
>> The backport is not clean because 17u has no  [JDK-8302908](https://bugs.openjdk.org/browse/JDK-8302908), which use v0 as mask register.
>> The test `test/hotspot/jtreg/compiler/intrinsics/string/TestEncodeIntrinsics.java` passed and command log with "-XX:+PrintOptoAssembly" output is similar to the mainline:
>> 
>> ...
>> 240     Encode ISO array R12, R11, R13 -> R10 # KILL R12, R11, R13, R28, V1-V3
>> ...
>> 0118    Encode ASCII array R12, R11, R13 -> R10 # KILL R12, R11, R13, R25, V1-V3
>> ...
>
> Dingli Zhang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:
> 
>  - Merge remote-tracking branch 'origin/master' into backport-8309254
>  - 8309254: Implement fast-path for ASCII-compatible CharsetEncoders on RISC-V

Marked as reviewed by fyang (Reviewer).

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PR Review: https://git.openjdk.org/jdk17u-dev/pull/1567#pullrequestreview-1583758621