[Bug rtl-optimization/67382] RTL combiner is too eager to combine (plus (reg 92) (reg 92)) to (ashift (reg 92) (const_int 1))

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67382

--- Comment #5 from Segher Boessenkool <segher at gcc dot gnu.org> ---
It turns out that noop other_insn is fine, and is accepted etc., but the
resulting i3 in this case is not.