RFR (S): 8154473: Update for CompilerDirectives to control stub generation and intrinsics

[Christian Thalinger]

> On Apr 18, 2016, at 7:38 AM, Deshpande, Vivek R <vivek.r.deshpande at intel.com> wrote:
> 
> Hi all
>  
> I would like to contribute a patch which helps to control the intrinsics in interpreter, c1 and c2 by disabling the stub generation.
> This uses -XX:DisableIntrinsic option to achieve the same.
> Could you please review and sponsor this patch.
>  
> Bug-id: 
> https://bugs.openjdk.java.net/browse/JDK-8154473 <https://bugs.openjdk.java.net/browse/JDK-8154473>
> webrev:
> http://cr.openjdk.java.net/~vdeshpande/CompilerDirectives/8154473/webrev.00/ <http://cr.openjdk.java.net/~vdeshpande/CompilerDirectives/8154473/webrev.00/>
src/cpu/x86/vm/stubGenerator_x86_64.cpp

+      if (vmIntrinsics::is_intrinsic_available(vmIntrinsics::_dpow)) {
       StubRoutines::_dpow = generate_libmPow();
-      StubRoutines::_dtan = generate_libmTan();
+      }
Was removing libmTan on purpose?

>  
> Thanks and regards,
> Vivek

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