[Bug tree-optimization/95817] New: Failure to optimize shift with constant to compare

[gabravier at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95817

            Bug ID: 95817
           Summary: Failure to optimize shift with constant to compare
           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: ---

bool f(int a)
{
    return (!(a >> 7));
}

This can be optimized to `return !((unsigned)a > 127);`. This transformation is
done by LLVM, but not by GCC.