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

[Viswanathan, Sandhya]

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

webrev:
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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