[Bug tree-optimization/95425] New: Failure to optimize bit twiddling on statics that does nothing

[gabravier at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95425

            Bug ID: 95425
           Summary: Failure to optimize bit twiddling on statics that does
                    nothing
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gabravier at gmail dot com
  Target Milestone: ---

uint32_t f()
{
    static uint32_t x = 0;
    x = (x >> 16) | (x << 16);
    return x;
}

This can be optimized to `return 0;`. This transformation is done by LLVM, but
not by GCC.