[Bug target/106827] New: operator++ doesn't work for enum -O2 -mcpu=cortex-m0plus

[bugzilla--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106827

            Bug ID: 106827
           Summary: operator++ doesn't work for enum  -O2
                    -mcpu=cortex-m0plus
           Product: gcc
           Version: 11.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bugzi...@little-bat.de
  Target Milestone: ---

Created attachment 53536
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53536&action=edit
the example on godbolt.org

gcc "optimizes" away prefix and postfix operator++ for enums.

see https://godbolt.org/z/1E65Ej7aE

--> three loops, only version 3 works (presumably).