RFR(L): 8074981 (Integer/FP scalar reduction optimization )

Vitaly Davidovich vitalyd at gmail.com
Tue Apr 7 18:30:37 UTC 2015


Hi Michael/Vladimir,

Out of curiosity, is this change and the out-for-review avx512 one going to
be (or planned on being) backported to java 8?

Thanks

On Tue, Apr 7, 2015 at 2:07 PM, Berg, Michael C <michael.c.berg at intel.com>
wrote:

>  Please ignore this one its already checked in…
>
>
>
> *From:* hotspot-compiler-dev [mailto:
> hotspot-compiler-dev-bounces at openjdk.java.net] *On Behalf Of *Berg,
> Michael C
> *Sent:* Monday, March 16, 2015 2:18 PM
> *To:* hotspot-compiler-dev at openjdk.java.net
> *Subject:* RFR(L): 8074981 (Integer/FP scalar reduction optimization )
>
>
>
> Hi All,
>
>
>
> We would like to contribute the Integer/FP scalar reduction optimization from
> Intel.
>
> The contribution is referenced as Bug ID 8074981 as a performance
> enhancement.
>
>
>
> Please review this patch:
>
> Bug-id: https://bugs.openjdk.java.net/browse/JDK-8074981
>
> webrev: https://bugs.openjdk.java.net/secure/attachment/26101/webrev.zip
>
>
>
> The optimization achieves as much as 2.3x on integer reductions and
> supports float and double precision optimizations
>
> which also have significant optimization uplift an obey strict fp
> constraints.
>
>
>
> Nils Eliasson has offered to sponsor this patch.
>
>
>
> Thanks,
>
>
>
> -Michael
>
>
>
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