[Bug rtl-optimization/97286] simplified subreg used outside of the loop can cause conflict and cause an extra move inside the loop

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97286

--- Comment #14 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
SLSR is definitely the wrong place for this. This is more like an out of ssa.

Also it needs to handle more than just VCEs, it needs to handle "nop" casts
too.

Oh LLM patches are questionable; even though GCC does NOT currently have a
policy; it is close to have one. If we base on what binutils (and the sound of
it, glibc) have it will ban patches which are co-authored by a LLM.