RFR: 8312425: [vectorapi] AArch64: Optimize vector math operations with SLEEF [v2]

[Andrew Haley]

On Thu, 14 Mar 2024 09:14:04 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> Hi,
>> Can you help to review this patch?
>> Thanks
>> 
>> This is a continuation of work based on [1] by @XiaohongGong, most work was done in that pr. In this new pr, just rebased the code in [1], then added some minor changes (renaming of calling method, add libsleef as extra lib in CI cross-build on aarch64 in github workflow); I aslo tested the combination of following scenarios:
>> * at build time
>>   * with/without sleef
>>   * with/without sve support 
>> * at runtime
>>   * with/without sleef
>>   * with/without sve support 
>> 
>> [1] https://github.com/openjdk/jdk/pull/16234
>> 
>> ## Regression Test
>> * test/jdk/jdk/incubator/vector/
>> * test/hotspot/jtreg/compiler/vectorapi/
>> 
>> ## Performance Test
>> Previously, @XiaohongGong has shared the data: https://github.com/openjdk/jdk/pull/16234#issuecomment-1767727028
>
> Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix variable name in github workflow

>     * at build time
>       
>       * with/without sleef
>       * with/without sve support

What is the relevance of SVE support at build time? Should it matter what the build machine is?

Its important to realize that almost no one except the JDK devs builds their own JDK, and having SLEEF dependencies at build time will mean that almost no one will use it. All this work you've done will be for nothing.

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PR Comment: https://git.openjdk.org/jdk/pull/18294#issuecomment-1997718999