Re: strtod ("nan") returns negative NaN

[Joseph Myers <joseph at codesourcery dot com>]

On Wed, 15 Aug 2018, Joseph Myers wrote:

> On Tue, 14 Aug 2018, Craig Howland wrote:
> 
> >      The f_QNAN value should be 0x7fc00000 regardless of byte ordering.  In
> 
> It would be better to use __builtin_nan ("") (and __builtin_nanf, 
> __builtin_nanl for other types) rather than using an integer 
> representation at all (of course that requires changes to other code to 
> avoid requiring an integer representation there).

(This is not an objection to any of the present patch proposals, just an 
observation that a different approach would avoid a series of problems 
that result from trying to hardcode information about such choices of 
bit-patterns for NaNs.)

-- 
Joseph S. Myers
joseph@codesourcery.com