https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110796
--- Comment #5 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> --- OK, so it signals FE_INVALID on the first test. Can you run this with the same options, and see what happens? ------- #include <fenv.h> #include <stdio.h> void ftrue (float x, float y) { if (!__builtin_iseqsig (x, y)) __builtin_abort (); } int main () { volatile float f1, f2; f1 = 0.f; f2 = 0.f; if (fetestexcept (FE_INVALID)) printf("Invalid 1\n"); ftrue (f1, f2); if (fetestexcept (FE_INVALID)) printf("Invalid 2\n"); return 0; } ------- One surprising thing is that the directive "dg-add-options ieee" in the test did not apparently add any other option for IEEE conformanceā¦