[Bug tree-optimization/108068] [10/11/12/13 Regression] decimal floating point signed zero is not honored

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108068

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
And COMPLEX_CST shouldn't probably appear because cplxlower1 runs before dom2
and
VECTOR_CST because GIMPLE_CONDs need scalar conditions, not vector.
So maybe it is indeed enough to just punt on DECIMAL_FLOAT_TYPE_Ps.