x86 Intrinsics for fma in Math Library

[Deshpande, Vivek R]

Hi

I would like to contribute a patch for scalar x86 intrinsic support for fma operations in jdk9.1
Could you please review the patch.
We see significant performance gain over library implementation.

Bug ID:
https://bugs.openjdk.java.net/browse/JDK-8154122
hotspot changes:
http://cr.openjdk.java.net/~vdeshpande/FMA/8154122/hotspot/webrev.00/
jdk changes:
http://cr.openjdk.java.net/~vdeshpande/FMA/8154122/jdk/webrev.00/

Regards,
Vivek
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