[Bug tree-optimization/96615] New: Failure to optimize out loop that eventually ends but has no side effects

[gabravier at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96615

            Bug ID: 96615
           Summary: Failure to optimize out loop that eventually ends but
                    has no side effects
           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: ---

void f(int bytes)
{
    bytes = (int)((unsigned int)bytes - 64);
    if (bytes > 0)
        f(bytes);
    return;
}

This can be optimized to doing nothing. LLVM does this transformation, but GCC
does not.