Jeremy Drake <pgsql(at)jdrake(dot)com> writes:
> So at this point I realize that intel's compiler is optimizing the loop
> away, at least for the std crc and probably for both. So I make mycrc an
> array of 2, and substript mycrc[j&1] in the loop.
That's not a good workaround, because making mycrc expensive to access
means your inner loop timing isn't credible at all. Instead try making the
buffer array nonlocal --- malloc it, perhaps.
regards, tom lane