GMP results for Woodcrest, Conroe, anyone?

[Torbjorn Granlund]

Karl Hasselström <kha at treskal.com> writes:

  On 2006-07-28 13:21:29 +0200, Torbjorn Granlund wrote:
  
  > It would be interesting to know how well it performs with GMP. While
  > the new P6 incarnation clearly has great 32-bit performance, for GMP
  > we almost only care about its 64-bit multiply throughput.
  
  Unless the 64-bit multiply throughput is more than 4 times as low as
  the 32-bit multiply throughput. But they wouldn't do that, would they?
  :-)
  
Well, they've already done that...

The Prescott P4 (and later) can sustain one 32x32->64 multiply
every 2nd cycle, and one 64x64->128 multiply every 10th cycle.

If Net rumours are to be believed, there are issues with 64-bit
arithmetic performance also with the new P6.

-- 
Torbjörn