compiler flag to use fma with Vc

[Matthias Kretz]

Hi Raman,

there's nothing you need to do. The compiler fuses multiplications and 
additions/subtractions automatically, unless you explicitly disable this 
feature with a compiler flag.

All the compiler needs to know is that the target architecture supports FMA 
instructions. The Vc cmake scripts make sure this is the case.

You can disassemble the resulting binaries to double check that FMA 
instructions are emitted.

Cheers,
  Matthias

On Tuesday, February 02, 2016 11:12:03 AM Raman Sehgal wrote:
> Hello Matthias and others,
> Is it possible to use FMA with Vc,
> if yes then what all compiler flags i have to give provide.
> 
> 
> 
> Regards,
> Raman

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 Dr. Matthias Kretz                                https://kretzfamily.de
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