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* fma operation
@ 2009-04-10 16:37 Martin Ettl
  0 siblings, 0 replies; only message in thread
From: Martin Ettl @ 2009-04-10 16:37 UTC (permalink / raw)
  To: gcc-help

Hi,

i am have made tests with the library version of fma-function (http://en.wikipedia.org/wiki/Multiply-accumulate). 
I tested this code below on my linux machine. Now, my question is, what version is faster? Version (1) or (2)? How to determine, that this operation is executed faster on my machine?
int main()
{
   double a=10.2;
   double b=12.;
   double c=9.;
   double e =a*b+c;   // (1)
   //double e =fma(a,b,c); // (2)
}

Thanks in advance!

Best regards

Ettl Martin

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