return uint32(x >> 34)
}

// countSub subtracts two counts obtained from profIndex.dataCount or profIndex.tagCount,
// assuming that they are no more than 2^29 apart (guaranteed since they are never more than
// len(data) or len(tags) apart, respectively).
// tagCount wraps at 2^30, while dataCount wraps at 2^32.
// This function works for both.
func countSub(x, y uint32) int {

	countIn, countOut := 0, 0
	frames := CallersFrames(pcs)
	var tb strings.Builder
	for {
		frame, more := frames.Next()
		fmt.Fprintf(&tb, "\n%s+0x%x %s:%d", frame.Function, frame.PC-frame.Entry, frame.File, frame.Line)
		switch frame.Function {
		case "runtime.TracebackSystemstack":
			countIn++
		case "runtime_test.TestTracebackSystemstack":
			countOut++
		}
		if !more {
			break

  // input and the outputs are all using this type).
  Type control_type = ControlType::get(parser.getBuilder().getContext());
  if (FunctionType type = mlir::dyn_cast<FunctionType>(types.front())) {
    if (llvm::count_if(type.getInputs(),
                       [=](Type type) { return type != control_type; }) != 1)
      return parser.emitError(parser.getNameLoc())
             << " expects a single data type";