Re: OT : Approximate / fast math libraries ?

[Chris Jones <jonesc hep phy cam ac uk>]

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