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From: "Martin Ettl" <ettl.martin@gmx.de>
To: gcc-help@gcc.gnu.org
Subject: fma operation
Date: Fri, 10 Apr 2009 16:37:00 -0000	[thread overview]
Message-ID: <20090410163737.156800@gmx.net> (raw)

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

-- 
Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger01

                 reply	other threads:[~2009-04-10 16:37 UTC|newest]

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