John R Pierce wrote:
> > I know this is a little off-topic, but how good is the P4 at integer
> operations?
>
> not that off topic at all. Integer multiplies can be more efficient than FP
> for this sort of thing, IF they are as fast. If a processor could pipeline
> 64 bit integer multiplies at one per clock with parallel adds at the same
> time it would be as fast or faster than using the 80 bit FP format... It
> will be interesting seeing what IA64 brings to the table when it finally
> gets up to speed...
>
> -jrp
>
Today, I've read in the manuals that a simple integer add with carry
(addc) has 8 clocks of latency and 3 clocks of throughput for a P4.
Humm, too much slowdown for single Ia32 instructions, Intel engineers
will know the reasons.
Guillermo.
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