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

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

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

Hongtao Liu <liuhongt at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |liuhongt at gcc dot gnu.org

--- Comment #13 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---
Created attachment 63964
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63964&action=edit
Candidate patch to solve the issue.

Instead of adding a separate pass, I add an optimization inside SLSR to
detected the redundant VIEW_CONVERT_EXPR inside the loop.