[Bug target/125636] [missed optimization] HImode byte-extend from memory causes partial-register-write stall on modern x86-64

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125636

--- Comment #4 from Drea Pinski <pinskia at gcc dot gnu.org> ---
Actually why not just emit the full extend for hi mode from the insn pattern
and then that would just work.