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in reply to Re: Is it possible to find the number of matching and non-matching positions in strings using perl code?
in thread Is it possible to find the number of matching and non-matching positions in strings using perl code?

Nice explanation++.

One minor change: s/binary operations are faster than looping over all characters/looping over the characters in C is faster than looping over the characters in Perl/

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Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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The start of some sanity?
  • Comment on Re^2: Is it possible to find the number of matching and non-matching positions in strings using perl code?

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Re^3: Is it possible to find the number of matching and non-matching positions in strings using perl code?
by Jenda (Abbot) on May 11, 2012 at 08:38 UTC

    The question is whether or how much C-level looping is there actually. Some CISC processors include string operators so the XOR might actually be a single instruction.

    Jenda
    Enoch was right!
    Enjoy the last years of Rome.

[reply]
      Some CISC processors include string operators so the XOR might actually be a single instruction.

      They still loop, just at the microcode level.

      There is always a conditional test; address register(s) get incremented; and often a count register gets decremented; for some number of repetitions or until some condition is met. It's still a 'loop' by any standard.

      With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
      Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
      "Science is about questioning the status quo. Questioning authority".
      In the absence of evidence, opinion is indistinguishable from prejudice.

      The start of some sanity?
[reply]

        Sure it's a loop. That's why I wrote "C-level loop". And you spoke about looping in C as well :-)

        Jenda
        Enoch was right!
        Enjoy the last years of Rome.

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