https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109132
--- Comment #4 from Martin Uecker <muecker at gwdg dot de> --- Seems you are right. Thanks! I get it for gcc-10 but not gcc-12 with -mfma on x86. Apparently, WG14 made a change at some point to allow this. But GCC does not implement the pragma to turn it off...