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

Viswanathan, Sandhya sandhya.viswanathan at intel.com
Fri Jul 24 17:04:00 UTC 2015

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,

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


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?


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