Source code for pacman.operations.router_compressors.ordered_covering_router_compressor.utils

# Copyright (c) 2017-2019 The University of Manchester
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""
based on
https://github.com/project-rig/rig/blob/master/rig/routing_table/utils.py
"""


[docs]def intersect(key_a, mask_a, key_b, mask_b): """Return if key-mask pairs intersect (i.e., would both match some of the same keys). For example, the key-mask pairs ``00XX`` and ``001X`` both match the keys ``0010`` and ``0011`` (i.e., they do intersect):: >>> intersect(0b0000, 0b1100, 0b0010, 0b1110) True But the key-mask pairs ``00XX`` and ``11XX`` do not match any of the same keys (i.e., they do not intersect):: >>> intersect(0b0000, 0b1100, 0b1100, 0b1100) False :param int key_a: :param int mask_a: The first key-mask pair :param int key_b: :param int mask_b: The second key-mask pair :rtype: bool :return: True if the two key-mask pairs intersect, otherwise False. """ return (key_a & mask_b) == (key_b & mask_a)