[Bug rtl-optimization/123380] [15/16 Regression] ICE: in gen_rtx_SUBREG, at emit-rtl.cc:1048 with -O2 and _Float16

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123380

--- Comment #5 from Jeffrey A. Law <law at gcc dot gnu.org> ---
So we're failing trying to build a paradoxical subreg for:

(mem:HF (reg/f:DI 162 [ fp ]) [1 *fp_8(D)+0 S2 A16])

We want the paradoxical in DI.  That fails the validate_subreg check as we're
not in LRA and boom!