[Bug rtl-optimization/83213] [8 Regression] peephole bug with -O2

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83213

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|2017-12-20 00:00:00         |2018-01-15
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 43139
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43139&action=edit
gcc8-pr83213.patch

Untested fix.  No testcase, as even the reduced one is way too large.