[Bug middle-end/66462] GCC isinf/isnan/... builtins cause sNaN exceptions

[tnfchris at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66462

--- Comment #16 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
> Do you have a link to those problems?  And no, please don't regress us for no
reason at all, it's really easy to *not* regress this on double-double.

As far as I am aware, the final version of the patch had no regressions for any
target, including PowerPC which I used the GCC compile farm to verify
(https://gcc.gnu.org/ml/gcc-patches/2016-11/msg02567.html)

The patch ended up not getting committed because of questions around whether
integer operations were fast enough on all targets and on the latest reviewer
requesting a major change to the patch.

At this time the patch had gone through 3 completely different implementations
(due to to every time having a different reviewer reviewing it) and so a 4th
rewrite was deemed not productive use of time.