Make _create_bit_op cdef function
@@ -4,7 +4,7 @@ from cupy.core._reduction import create_reduction_func
from cupy.core.core cimport ndarray
-cpdef _create_bit_op(name, op, no_bool, doc=''):
+cdef _create_bit_op(name, op, no_bool, doc=''):
types = () if no_bool else ('??->?',)
return create_ufunc(
'cupy_' + name,
