[Bug rtl-optimization/58295] [4.8/4.9 regression] Missed zero-extension elimination in the combiner

[ebotcazou at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58295

--- Comment #13 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> TARGET_LEGITIMATE_COMBINED_INSN hook is add in r190846
> and x86 used it in r190847.

Sure, but you cannot use an x86 hook to reject something for non-x86 arches...