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On Aug 15 11:51, Craig Howland wrote: > On 08/15/2018 11:40 AM, Joseph Myers wrote: > > 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). > I totally agree. To add it to the record, in conjunction with this, the > strtod implementation really should be upgraded to David Gay's more recent > version, which is 128-bit friendly. (I almost had this done some time ago, > but didn't quite finish.) > > (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.) > > > Also agreed. If I had had time yesterday I might have tried it as I had > briefly thought of it, but didn't think to get the idea out to the list, so > I'm glad you did. Sounds like a nice followup patch...? Corinna -- Corinna Vinschen Cygwin Maintainer Red Hat
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