strtod ("nan") returns negative NaN
Corinna Vinschen
vinschen@redhat.com
Wed Aug 15 16:45:00 GMT 2018
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
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 833 bytes
Desc: not available
URL: <http://sourceware.org/pipermail/newlib/attachments/20180815/33337b01/attachment.sig>
More information about the Newlib
mailing list