[Bug c/112449] Arithmetic operations can produce signaling NaNs

[post+gcc at ralfj dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112449

--- Comment #7 from post+gcc at ralfj dot de ---
I guess the idea is that by passing a signaling NaN to a float operation, I am
already entering unspecified behavior, so it's okay for that float operation to
violate its usual contract and return a signaling NaN?