// about any other code interrupting us.
		if mp.cgoCallersUse.Load() == 0 && mp.cgoCallers != nil && mp.cgoCallers[0] != 0 {
			for cgoOff < len(mp.cgoCallers) && mp.cgoCallers[cgoOff] != 0 {
				cgoOff++
			}
			n += copy(stk[:], mp.cgoCallers[:cgoOff])
			mp.cgoCallers[0] = 0
		}

		// Collect Go stack that leads to the cgo call.
		u.initAt(mp.curg.syscallpc, mp.curg.syscallsp, 0, mp.curg, unwindSilentErrors)

  // All concat operands must be defined by ops.
  Operation* first_arg_op = op.getValues().front().getDefiningOp();
  if (first_arg_op == nullptr) return failure();

  // All concat operands must be produced by the coeff-wise unary operation.
  if (!first_arg_op->hasTrait<OpTrait::TF::CwiseUnary>()) return failure();

  // All concat operands must be defined by the op of same kind.

};

LogicalResult HoistCwiseUnaryOutOfUnpack::matchAndRewrite(
    UnpackOp op, PatternRewriter &rewriter) const {
  auto loc = op.getLoc();

  // First unpack user must be coeff-wise unary operation.
  Operation *first_user = *op->getUsers().begin();
  if (!first_user->hasTrait<OpTrait::TF::CwiseUnary>()) return failure();

  // All unpack users must be defined by the op of same kind.