https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61441
--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- Bugs in -fsignaling-nans (in this case, that a conversion of a signaling NaN from float to double is incorrectly folded) should be fixed just like any other bug. That sentence is simply warning that there are many known bugs in this area.
