[Bug rtl-optimization/78590] [7 Regression] FAIL: gcc.target/aarch64/advsimd-intrinsics/vget_lane.c in change_zero_ext in combine

[ktkachov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78590

--- Comment #2 from ktkachov at gcc dot gnu.org ---
I suspect we want to extend the
&& !paradoxical_subreg_p (XEXP (x, 0))
check to also check REG_P (SUBREG_REG (XEXP (x, 0))).
The pattern processed in this case is:
(set (reg:SI 80)
    (zero_extend:SI (subreg:HI (float_truncate:HF (reg:DF 79)) 0)))