https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104865
--- Comment #7 from Maciej W. Rozycki <macro at orcam dot me.uk> --- Well, it's not clear to me whether the reserved operand as defined by the VAX floating-point architecture ought be considered an sNaN given that there is no qNaN. Also a reserved operand causes a fault with any FP instruction, even data moves (though one can move a reserved operand bit pattern with an integer move of the right width, observing that there is a single register file for both integer and FP arithmetic, and that of course FP operations can be directly performed on memory as well). In any case there's probably more than one bug here.