RFR: 8256536: Newer AMD 19h (EPYC) Processor family defaults

[David Holmes]

Hi Rohit,

On 18/11/2020 8:41 pm, Rohit Arul Raj wrote:
> This patch sets the following flags as defaults for newer AMD 19h (EPYC) processors.
>        bool UseFPUForSpilling               = true
>        bool UseUnalignedLoadStores    = true
>        bool UseXMMForArrayCopy        = true
>        bool UseXMMForObjInit             = true
>        bool UseFastStosb                       = false
>        bool AlignVector                          = false

I assume you have performance numbers to justify/motivate this change. 
Can you please provide some details in the bug report.

Thanks,
David

> Additional testing: make run-test TEST="tier1 tier2" JTREG="JOBS=128" CONF=linux-x86_64-server-fastdebug
> 
> Please review this change.
> 
> Thanks,
> Rohit
> 
> -------------
> 
> Commit messages:
>   - 8256536: Newer AMD 19h (EPYC) Processor family defaults
> 
> Changes: https://git.openjdk.java.net/jdk/pull/1288/files
>   Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1288&range=00
>    Issue: https://bugs.openjdk.java.net/browse/JDK-8256536
>    Stats: 12 lines in 1 file changed: 9 ins; 0 del; 3 mod
>    Patch: https://git.openjdk.java.net/jdk/pull/1288.diff
>    Fetch: git fetch https://git.openjdk.java.net/jdk pull/1288/head:pull/1288
> 
> PR: https://git.openjdk.java.net/jdk/pull/1288
>