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11992Re: [PrimeNumbers] has SB been tested?

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  • Michael Bell
    Apr 1, 2003
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      D├ęcio Luiz Gazzoni Filho wrote:
      > On Tuesday 01 April 2003 12:53, Michael Bell wrote:
      > > Hi,
      > >
      > > I think we are getting confused here between roundoff errors (which are
      > > implementation independent assuming the exact same FFT algorithm, limb
      > > size, etc. being run on a processor with the same precision) and coding
      > > errors. The latter are nothing much to do with size.
      >
      > Exactly. Since SoB already found 5 or 6 primes, I assume their code has no
      > errors of the latter kind. The only errors that might creep up now are
      > of the
      > roundoff kind, which I argued against in my other posts.

      Except that George's code uses different assembler routines for each FFT
      length, so that doesn't really hold.

      >
      > I also agree with David, but IMO no one should hope that SoB is not finding
      > any new primes due to the multiplication code pushing the limits of
      > roundoff
      > errors (and even less due to outright buggy code).
      >

      Indeed, I should think this is pretty unlikely.

      Mike.
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