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Re: [RFC] Quad-float support, round 4
On Tue, Sep 14, 2010 at 02:41:25PM -0700, Tim Prince wrote:
> On 9/14/2010 8:41 AM, Steve Kargl wrote:
> > gfc ifc
> >sqrtq 200 160 (ie, __float128 is XXX times slower than double)
> >sinq 100 6
> >cosq 150 10
> >asinhq 120 10
> >erfcq 150 6
> >
> >on the same hardware. Note, gfc = gfortran, and ifc = ifort.
> >
> >The question then becomes what are the algorithms that Intel uses
> >to compute the last four functions.
> As far as I know, the algorithms in the Intel quad precision math
> library are closely held, although you might learn something by objdump
> or similar tools. I would be concerned that doing this myself would run
> into conflicts with my employer, as my gcc paperwork will not be
> reconfirmed by them.
>
I suppose feeding oneself and family is more important
than hacking for fun. :-)
--
Steve