SuperWord enhancement to support vector conditional move (CMovVD ) on Intel AVX cpu.

[Igor Veresov]

Here it is: https://bugs.openjdk.java.net/browse/JDK-8139340 <https://bugs.openjdk.java.net/browse/JDK-8139340>

igor

> On Oct 9, 2015, at 2:57 PM, Civlin, Jan <jan.civlin at intel.com> wrote:
> 
> Thank you, Igor.
> What is the RFR for this?
>  
> From: Igor Veresov [mailto:igor.veresov at oracle.com] 
> Sent: Friday, October 9, 2015 2:53 PM
> To: Civlin, Jan
> Cc: hotspot compiler; Vladimir Kozlov
> Subject: Re: SuperWord enhancement to support vector conditional move (CMovVD ) on Intel AVX cpu.
>  
> Here the webrev: http://cr.openjdk.java.net/~iveresov/vector-cmove/webrev.00/ <http://cr.openjdk.java.net/~iveresov/vector-cmove/webrev.00/>
>  
> igor
>  
> On Oct 9, 2015, at 1:15 PM, Civlin, Jan <jan.civlin at intel.com <mailto:jan.civlin at intel.com>> wrote:
>  
> Igor, 
>  
> Please create RFR and upload this patch. You may need to rename ancnav.js.remove_this_extention back to ancnav.js (I have to rename it for passing the mail server filters).
>  
> Description:
> SuperWord enhancement  to support vector conditional move (CMovVD) on Intel AVX cpu.
> The SuperWord optimization bails out on counted loops that contain any conditional statement other than the loop exit, and this prevents vectorization of many compute bound loops.
> The proposed enhancement enables generation of CMovD on demand (-XX:+UseCMov), and further  vectorization of CMovD (into CMovVD ) in SuperWord optimization.
>  
> The performance gain observed on a simplified Monte Carlo Option Calculation was up to 2x speed-up.  
>  
> Thank you,
>  
> Jan.
>  
> <webrev-r9162-9157.tar.bz2>

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