Re: OT : Approximate / fast math libraries ?

From: Chris Jones <jonesc@xxxxxxxxxxxxxxxxx>
Date: Fri, 31 Aug 2007 19:00:49 +0100

On Friday 31 August 2007 5:50:36 pm Rex Dieter wrote:

Chris Jones wrote:

Hi,

I have a number crunch application that is starting to hit bottlenecks
in standard maths functions, like log, exp sqrt etc. Thing is, in many
places I don't need much precision, so was wondering if there was
anything I could do, like use a different library or enable some gcc
options (currently using -O2) to speed things up.

gcc -ffast-math

Yes, I tried that but it didn't seem to make as much difference as I had hoped
it would...

Chris

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