[Bug middle-end/124250] [15/16 Regression] LoongArch: internal compiler error: in extract_insn, at recog.cc:2882

[xry111 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124250

--- Comment #8 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #7)
> How do you know zero_extend is correct?

This code path only handles shift and I guess a negative shift amount is always
undefined?