[Bug libc/17661] printf should output "nan" for some invalid floating point values

[joseph at codesourcery dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=17661

--- Comment #5 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
But I don't think it's just printf - there are load of libm functions that 
examine the bits of a floating-point representation to determine 
properties of the value, and consistent handling of these trap 
representations would require all those functions to consider them.

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