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Re: float("nan") in set or as key

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Date Mon, 6 Jun 2011 09:13:25 +1000
Subject Re: float("nan") in set or as key
From Chris Angelico <rosuav@gmail.com>
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On Mon, Jun 6, 2011 at 8:54 AM, Chris Torek <nospam@torek.net> wrote:
> A signalling NaN traps at (more or less -- details vary depending
> on FPU architecture) load time.

Load. By this you mean the operation of taking a bit-pattern in RAM
and putting it into a register? So, you can calculate 0/0, get a
signalling NaN, and then save that into a memory variable, all without
it trapping; and then it traps when you next perform an operation on
that number?

Apologies, this is getting quite off-topic and away from Python.

Chris Angelico

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Thread

Re: float("nan") in set or as key Carl Banks <pavlovevidence@gmail.com> - 2011-06-03 13:27 -0700
  Re: float("nan") in set or as key Chris Angelico <rosuav@gmail.com> - 2011-06-04 06:35 +1000
    Re: float("nan") in set or as key Chris Torek <nospam@torek.net> - 2011-06-05 22:54 +0000
      Re: float("nan") in set or as key Chris Angelico <rosuav@gmail.com> - 2011-06-06 09:13 +1000
        Re: float("nan") in set or as key Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-06-06 01:21 +0000
          Re: float("nan") in set or as key Chris Torek <nospam@torek.net> - 2011-06-06 01:56 +0000
          Re: float("nan") in set or as key Chris Angelico <rosuav@gmail.com> - 2011-06-06 14:11 +1000
            Re: float("nan") in set or as key Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-06-06 04:59 +0000
              Re: float("nan") in set or as key Chris Angelico <rosuav@gmail.com> - 2011-06-06 15:10 +1000
  Re: float("nan") in set or as key Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-06-04 04:54 +0000
    Re: float("nan") in set or as key Ethan Furman <ethan@stoneleaf.us> - 2011-06-03 23:04 -0700
      Re: float("nan") in set or as key Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-06-04 09:35 +0000
        Re: float("nan") in set or as key Ben Finney <ben+python@benfinney.id.au> - 2011-06-04 20:20 +1000
        Re: float("nan") in set or as key Ethan Furman <ethan@stoneleaf.us> - 2011-06-04 14:28 -0700
        Re: float("nan") in set or as key Robert Kern <robert.kern@gmail.com> - 2011-06-04 16:49 -0500
          Re: float("nan") in set or as key Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-06-05 02:03 +0000
            Re: float("nan") in set or as key Robert Kern <robert.kern@gmail.com> - 2011-06-05 14:44 -0500

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