https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85811
--- Comment #1 from Marc Glisse <glisse at gcc dot gnu.org> --- tree_binary_nonnegative_warnv_p for RDIV_EXPR does RECURSE (op0) && RECURSE (op1), but that doesn't work so well when the denominator can be 0. I guess it is still ok when finite-math-only (or no-nans and no-signed-zeros maybe?), or when we can prove that the denominator is non-zero.
