def make_constant_array(self, builder, typ, ary):
        assert typ.layout == 'C'                # assumed in typeinfer.py
        ary = numpy.ascontiguousarray(ary)
        flat = ary.flatten()

        # Handle data
        if self.is_struct_type(typ.dtype):
            # FIXME
            raise TypeError("Do not support structure dtype as constant "
                            "array, yet.")

        values = [self.get_constant(typ.dtype, flat[i])
                  for i in range(flat.size)]

        lldtype = values[0].type
        consts = Constant.array(lldtype, values)
        data = cgutils.global_constant(builder, ".const.array.data", consts)

        # Handle shape
        llintp = self.get_value_type(types.intp)
        shapevals = [self.get_constant(types.intp, s) for s in ary.shape]
        cshape = Constant.array(llintp, shapevals)


        # Handle strides
        stridevals = [self.get_constant(types.intp, s) for s in ary.strides]
        cstrides = Constant.array(llintp, stridevals)

        # Create array structure
        cary = self.make_array(typ)(self, builder)
        cary.data = builder.bitcast(data, cary.data.type)
        cary.shape = cshape
        cary.strides = cstrides
        return cary._getvalue()

def reduce_datetime_for_unit(builder, dt_val, src_unit, dest_unit):
    dest_unit_code = npdatetime.DATETIME_UNITS[dest_unit]
    src_unit_code = npdatetime.DATETIME_UNITS[src_unit]
    if dest_unit_code < 2 or src_unit_code >= 2:
        return dt_val, src_unit
    # Need to compute the day ordinal for *dt_val*
    if src_unit_code == 0:
        # Years to days
        year_val = dt_val
        days_val = year_to_days(builder, year_val)

    else:
        # Months to days
        leap_array = cgutils.global_constant(builder, "leap_year_months_acc",
                                             leap_year_months_acc)
        normal_array = cgutils.global_constant(builder, "normal_year_months_acc",
                                               normal_year_months_acc)

        days = cgutils.alloca_once(builder, TIMEDELTA64)

        # First compute year number and month number
        year, month = cgutils.divmod_by_constant(builder, dt_val, 12)

        # Then deduce the number of days
        with cgutils.ifelse(builder,
                            is_leap_year(builder, year)) as (then, otherwise):
            with then:
                addend = builder.load(cgutils.gep(builder, leap_array,
                                                  0, month))
                builder.store(addend, days)
            with otherwise:
                addend = builder.load(cgutils.gep(builder, normal_array,
                                                  0, month))
                builder.store(addend, days)

        days_val = year_to_days(builder, year)
        days_val = builder.add(days_val, builder.load(days))

    if dest_unit_code == 2:
        # Need to scale back to weeks
        weeks, _ = cgutils.divmod_by_constant(builder, days_val, 7)
        return weeks, 'W'
    else:
        return days_val, 'D'

    def make_keywords(self, kws):
        strings = []
        stringtype = Type.pointer(Type.int(8))
        for k in kws:
            strings.append(self.make_const_string(k))

        strings.append(Constant.null(stringtype))
        kwlist = Constant.array(stringtype, strings)
        kwlist = cgutils.global_constant(self.module, ".kwlist", kwlist)
        return Constant.bitcast(kwlist, Type.pointer(stringtype))

 def insert_const_string(self, mod, string):
     stringtype = GENERIC_POINTER
     text = Constant.stringz(string)
     name = ".const.%s" % string
     for gv in mod.global_variables:
         if gv.name == name and gv.type.pointee == text.type:
             break
     else:
         gv = cgutils.global_constant(mod, name, text)
     return Constant.bitcast(gv, stringtype)

 def insert_unique_const(self, mod, name, val):
     """
     Insert a unique internal constant named *name*, with LLVM value
     *val*, into module *mod*.
     """
     gv = mod.get_global(name)
     if gv is not None:
         return gv
     else:
         return cgutils.global_constant(mod, name, val)

 def insert_unique_const(self, mod, name, val):
     """
     Insert a unique internal constant named *name*, with LLVM value
     *val*, into module *mod*.
     """
     try:
         gv = mod.get_global(name)
     except KeyError:
         return cgutils.global_constant(mod, name, val)
     else:
         return gv

    def make_constant_array(self, builder, typ, ary):
        """
        Create an array structure reifying the given constant array.
        A low-level contiguous array constant is created in the LLVM IR.
        """
        datatype = self.get_data_type(typ.dtype)
        # don't freeze ary of non-contig or bigger than 1MB
        size_limit = 10**6

        if (self.allow_dynamic_globals and
                (typ.layout not in 'FC' or ary.nbytes > size_limit)):
            # get pointer from the ary
            dataptr = ary.ctypes.data
            data = self.add_dynamic_addr(builder, dataptr, info=str(type(dataptr)))
            rt_addr = self.add_dynamic_addr(builder, id(ary), info=str(type(ary)))
        else:
            # Handle data: reify the flattened array in "C" or "F" order as a
            # global array of bytes.
            flat = ary.flatten(order=typ.layout)
            # Note: we use `bytearray(flat.data)` instead of `bytearray(flat)` to
            #       workaround issue #1850 which is due to numpy issue #3147
            consts = Constant.array(Type.int(8), bytearray(flat.data))
            data = cgutils.global_constant(builder, ".const.array.data", consts)
            # Ensure correct data alignment (issue #1933)
            data.align = self.get_abi_alignment(datatype)
            # No reference to parent ndarray
            rt_addr = None

        # Handle shape
        llintp = self.get_value_type(types.intp)
        shapevals = [self.get_constant(types.intp, s) for s in ary.shape]
        cshape = Constant.array(llintp, shapevals)

        # Handle strides
        stridevals = [self.get_constant(types.intp, s) for s in ary.strides]
        cstrides = Constant.array(llintp, stridevals)

        # Create array structure
        cary = self.make_array(typ)(self, builder)

        intp_itemsize = self.get_constant(types.intp, ary.dtype.itemsize)
        self.populate_array(cary,
                            data=builder.bitcast(data, cary.data.type),
                            shape=cshape,
                            strides=cstrides,
                            itemsize=intp_itemsize,
                            parent=rt_addr,
                            meminfo=None)

        return cary._getvalue()

    def make_constant_array(self, builder, typ, ary):
        """
        Create an array structure reifying the given constant array.
        A low-level contiguous array constant is created in the LLVM IR.
        """
        assert typ.layout == 'C'                # assumed in typeinfer.py
        datatype = self.get_data_type(typ.dtype)

        # Handle data: reify the flattened array in "C" order as a
        # global array of bytes.
        flat = ary.flatten()
        # Note: we use `bytearray(flat.data)` instead of `bytearray(flat)` to
        #       workaround issue #1850 which is due to numpy issue #3147
        consts = Constant.array(Type.int(8), bytearray(flat.data))
        data = cgutils.global_constant(builder, ".const.array.data", consts)
        # Ensure correct data alignment (issue #1933)
        data.align = self.get_abi_alignment(datatype)

        # Handle shape
        llintp = self.get_value_type(types.intp)
        shapevals = [self.get_constant(types.intp, s) for s in ary.shape]
        cshape = Constant.array(llintp, shapevals)

        # Handle strides
        if ary.ndim > 0:
            # Use strides of the equivalent C-contiguous array.
            contig = np.ascontiguousarray(ary)
            stridevals = [self.get_constant(types.intp, s) for s in contig.strides]
        else:
            stridevals = []
        cstrides = Constant.array(llintp, stridevals)

        # Create array structure
        cary = self.make_array(typ)(self, builder)

        rt_addr = self.get_constant(types.uintp, id(ary)).inttoptr(
            self.get_value_type(types.pyobject))

        intp_itemsize = self.get_constant(types.intp, ary.dtype.itemsize)
        self.populate_array(cary,
                            data=builder.bitcast(data, cary.data.type),
                            shape=cshape,
                            strides=cstrides,
                            itemsize=intp_itemsize,
                            parent=rt_addr,
                            meminfo=None)

        return cary._getvalue()

    def make_constant_array(self, builder, typ, ary):
        assert typ.layout == 'C'                # assumed in typeinfer.py
        ary = numpy.ascontiguousarray(ary)
        flat = ary.flatten()

        # Handle data
        if self.is_struct_type(typ.dtype):
            values = [self.get_constant_struct(builder, typ.dtype, flat[i])
                      for i in range(flat.size)]
        else:
            values = [self.get_constant(typ.dtype, flat[i])
                      for i in range(flat.size)]

        lldtype = values[0].type
        consts = Constant.array(lldtype, values)
        data = cgutils.global_constant(builder, ".const.array.data", consts)

        # Handle shape
        llintp = self.get_value_type(types.intp)
        shapevals = [self.get_constant(types.intp, s) for s in ary.shape]
        cshape = Constant.array(llintp, shapevals)


        # Handle strides
        stridevals = [self.get_constant(types.intp, s) for s in ary.strides]
        cstrides = Constant.array(llintp, stridevals)

        # Create array structure
        cary = self.make_array(typ)(self, builder)

        rt_addr = self.get_constant(types.uintp, id(ary)).inttoptr(
            self.get_value_type(types.pyobject))

        intp_itemsize = self.get_constant(types.intp, ary.dtype.itemsize)
        self.populate_array(cary,
                            data=builder.bitcast(data, cary.data.type),
                            shape=cshape,
                            strides=cstrides,
                            itemsize=intp_itemsize,
                            parent=rt_addr,
                            meminfo=None)

        return cary._getvalue()

    def make_constant_array(self, builder, typ, ary):
        """
        Create an array structure reifying the given constant array.
        A low-level contiguous array constant is created in the LLVM IR.
        """
        assert typ.layout == 'C'                # assumed in typeinfer.py

        # Handle data: reify the flattened array in "C" order as a
        # global array of bytes.
        flat = ary.flatten()
        consts = Constant.array(Type.int(8), bytearray(flat))
        data = cgutils.global_constant(builder, ".const.array.data", consts)

        # Handle shape
        llintp = self.get_value_type(types.intp)
        shapevals = [self.get_constant(types.intp, s) for s in ary.shape]
        cshape = Constant.array(llintp, shapevals)

        # Handle strides: use strides of the equivalent C-contiguous array.
        contig = numpy.ascontiguousarray(ary)
        stridevals = [self.get_constant(types.intp, s) for s in contig.strides]
        cstrides = Constant.array(llintp, stridevals)

        # Create array structure
        cary = self.make_array(typ)(self, builder)

        rt_addr = self.get_constant(types.uintp, id(ary)).inttoptr(
            self.get_value_type(types.pyobject))

        intp_itemsize = self.get_constant(types.intp, ary.dtype.itemsize)
        self.populate_array(cary,
                            data=builder.bitcast(data, cary.data.type),
                            shape=cshape,
                            strides=cstrides,
                            itemsize=intp_itemsize,
                            parent=rt_addr,
                            meminfo=None)

        return cary._getvalue()