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

[Vladimir Kozlov]

Currently it is only jdk9. There are no plans to backport to 8u.
The thinking is that we will get jdk9 released when this hardware will be widely available.

Regards,
Vladimir

On 4/7/15 11:30 AM, Vitaly Davidovich wrote:
> 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 <mailto: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
>     <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 <mailto: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.____
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>     The contribution is referenced as Bug ID 8074981 as a performance enhancement. ____
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>     __ __
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>     Please review this patch:____
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>     Bug-id: https://bugs.openjdk.java.net/browse/JDK-8074981 ____
>
>     webrev: https://bugs.openjdk.java.net/secure/attachment/26101/webrev.zip ____
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>     __ __
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>     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.____
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>     __ __
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>     Nils Eliasson has offered to sponsor this patch.____
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>     __ __
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>     Thanks,____
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>     __ __
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>     -Michael____
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>     __ __
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>