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June 27, 2011 Different NaNs used | ||||
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This question is related to this thread: http://d.puremagic.com/issues/show_bug.cgi?id=3632 Can you tell me why real.nan and real.init don't contain the same bit patterns? import std.math: isIdentical; void main() { assert(isIdentical(real.nan, real.init)); // this asserts } Bye and thank you, bearophile |
June 29, 2011 Re: Different NaNs used | ||||
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Posted in reply to bearophile | On Mon, 27 Jun 2011 16:41:14 -0400, bearophile wrote: > This question is related to this thread: http://d.puremagic.com/issues/show_bug.cgi?id=3632 > > Can you tell me why real.nan and real.init don't contain the same bit patterns? > > > import std.math: isIdentical; > void main() { > assert(isIdentical(real.nan, real.init)); // this asserts > } real.init is a signaling NaN, real.nan is not. I don't know if this is by design, but I suppose it may be: You can "quiet" a signaling NaN by assigning real.nan to your variable. http://en.wikipedia.org/wiki/NaN#Signaling_NaN -Lars |
June 29, 2011 Re: Different NaNs used | ||||
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Posted in reply to Lars T. Kyllingstad | Lars T. Kyllingstad:
> real.init is a signaling NaN, real.nan is not. I don't know if this is by design, but I suppose it may be:
Thank you for your probably correct hypothesis :-)
Bye,
bearophile
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