FMA using Vc

[Matthias Kretz]

Hi,

On Thursday 06 November 2014 10:09:32 Raman Sehgal wrote:
> Is is possible to use FMA instruction with AVX in Vc.
> 
> I will be highly obliged if you give some code snippet to do FMA with Vc.

Your compiler can/should fuse multiply and add operations automatically. Thus 
if you write:
  float_v x, y, z;
  x = x * y + z;
then the compiler should translate this as an FMA. GCC and clang have compiler 
flags to enable/disable this fusing, so take a look at your compiler manual if 
you're unsure.

Cheers,
  Matthias

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 Dipl.-Phys. Matthias Kretz

 Web:   http://compeng.uni-frankfurt.de/?mkretz

 SIMD easy and portable: http://compeng.uni-frankfurt.de/?vc
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