(j3.2006) Liaison to IFIP WG 2.5
Tue Aug 21 18:05:30 EDT 2007
On Tue, 2007-08-21 at 11:12 -0700, Aleksandar Donev wrote:
> > 2) Hardware support needs to be widespread to make something beyond a
> > module worthwhile from a performance point of view. That means, at a
> > minimum, that IEEE 754r++ specify a standard.
> Yes, I see hardware support as a necessary precondition.
> Personally, I've wondered if it is possible to do interval FP in an additional
> off-processor unit (like GPUs or FPGAs or some other thing one can add to a
> processor)? Interval arithmetic is nice to have but IMO it is almost never
> necessary that ALL floating-point calculations be done with intervals.
> Certainly not at the cost of the usual FP calculations.
Kulisch and IFIP WG 2.5 are not proposing that all FP in a processor be
interval FP, rather that additional interval FP instructions be
Kulisch showed a PCI card with an interval co-processor on it. It was
an old slow design from some years ago, but still faster than interval
FP done with software in a Pentium 4.
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