[Bug tree-optimization/80758] isnan/isfinite/isinf value propagation

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80758

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-05-15
                 CC|                            |rguenth at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.  Long on (my) TODO list.  Simplest version would propagate
fpclassify () bits plus signbit ().  Special values might be interesting as
well ("not zero",
one, minus one, integer).

General value-range propagation might be doable but is more work.

SSA info needs to be enhanced to record FP stuff.