[Bug tree-optimization/96929] New: Failure to optimize right shift of -1 to -1

[gabravier at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96929

            Bug ID: 96929
           Summary: Failure to optimize right shift of -1 to -1
           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: ---

int f(int b)
{
    return -1 >> b;
}

This can be optimized to `return -1;`. This transformation is done by LLVM, but
not by GCC.