GMP 4.3.1 misdetects intel X7460

Torbjorn Granlund tg at
Sun Jul 26 13:18:34 CEST 2009

David Harvey <dmharvey at> writes:

  > If not, please run and time this program, it will tell the latter two
  > apart:
  >         .globl  main
  > main:
  >         mov     $2666666667, %ecx
  > 1:      mul
  >         dec     %ecx
  >         jnz     1b
  >         ret
  I changed the "mul" to "mul %rbx", and got 6.94s.
Thanks, this is a Penryn, pipeline wise.

I am now trying to find updated cpuid info, but no site seems to know of
these processors.  I suppose 6-core processors are rare.


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