[Bug rtl-optimization/78378] [5/6/7 Regression] wrong code when combining shift + mult + zero_extend

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78378

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 40059
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40059&action=edit
gcc7-pr78378.patch

Untested fix.