https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82207
--- Comment #16 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> --- Part 1/3 committed: IEEE_CLASS now recognises signaling NaNs on targets that provide the issignaling macro (from TS 18661-1:2014). https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=492954263e39346287a5a2a32bcc5312466a0ee1
