RFR (M): 8132207: Update for x86 exp in the math lib

[Christian Thalinger]

Got it.  Thanks.

> On Jul 24, 2015, at 10:04 AM, Viswanathan, Sandhya <sandhya.viswanathan at intel.com> wrote:
> 
> Hi Christian,
>   This is generated code by the ICC, that’s why you don’t see any line by line comments here. The algorithm used by Intel libm is given in comments as a preamble.
> Best Regards,
> Sandhya
>  
>  
> From: hotspot-compiler-dev [mailto:hotspot-compiler-dev-bounces at openjdk.java.net] On Behalf Of Christian Thalinger
> Sent: Friday, July 24, 2015 9:21 AM
> To: Deshpande, Vivek R
> Cc: Vladimir.Kozlov at oracle.com; hotspot-compiler-dev at openjdk.java.net
> Subject: Re: RFR (M): 8132207: Update for x86 exp in the math lib
>  
>  
> On Jul 23, 2015, at 1:26 PM, Deshpande, Vivek R <vivek.r.deshpande at intel.com <mailto:vivek.r.deshpande at intel.com>> wrote:
>  
> Hi all
>  
> I would like to contribute a patch which optimizes Math.exp() for 64 and 32 bit X86 architecture using Intel LIBM  implementation.
> Please review and sponsor this patch.
>  
> Bug-id: https://bugs.openjdk.java.net/browse/JDK-8132207 <https://bugs.openjdk.java.net/browse/JDK-8132207> 
> 
> webrev:
> http://cr.openjdk.java.net/~mcberg/8132207/webrev.01/ <http://cr.openjdk.java.net/~mcberg/8132207/webrev.01/> 
>  
> I have waited for this a long time and I applaud the change!  But I’m baffled by the complexity of the implementation ;-)  Are there any comments in the original Intel libm implementation which we could add here as well?
> 
> 
>  
> Thanks,
> Vivek
>  

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