[Bug middle-end/98420] Invalid simplification of x - x with -frounding-math

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98420

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> probably conditional on HONOR_SIGNED_ZEROS.

That is checked now:

+      || (!tree_expr_maybe_nan_p (@0)
+         && !tree_expr_maybe_infinite_p (@0)))

The part that is missed is the flag_rounding_math .