[Bug target/127177] __builtin_isinf vectorization incorrectly signals FE_INVALID

[mkretz at gcc dot gnu.org]

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..