https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127177
--- Comment #4 from Matthias Kretz (Vir) <mkretz at gcc dot gnu.org> --- Oh, 'fold_builtin_interclass_mathfn' in builtins.cc generates 'isgreater(abs(x), max)', which is why it's also vectorized as such. IMHO, fold_builtin_interclass_mathfn should generate 'or(x, -0) == -inf', but I assume that would break existing pattern matches for isinf, right? Also, I just checked with AVX512DQ and isinf is not compiled to VFPCLASS..
