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On Aug 16 11:56, Corinna Vinschen wrote: > On Aug 16 10:22, Masamichi Hosoda wrote: > > > 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...? > > > > Here's patch v4. > > It uses {nan|nanl} ("") instead of the integer representations of NaN. > > It also removes the unused definitions of them. > > Still looks good on Cygwin. I'll push this tomorrow, unless somebody > objects. Pushed. Thanks a lot, Corinna -- Corinna Vinschen Cygwin Maintainer Red Hat
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