Is forprimestep() using Eratosthenes in some modes?

Ilya Zakharevich <[email protected]>
Newsgroups gmane.comp.mathematics.pari.devel
Message-ID <[email protected]> 
I cannot find any situation in which forprimestep() would be more than
20% quickier than forstep() in combination with isprime().  This means
that I cannot find any range of parameters where the implementation
would use Eratosthenes sieve (as it often should?).

What am I missing?

Thanks,
Ilya
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