f4pga/utils/quicklogic/repacker/tests/lut_padding/test_lut_padding.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (C) 2022 F4PGA Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0
import sys
import os
import tempfile

import pytest

sys.path.append(os.path.join(os.path.dirname(__file__), "..", ".."))
from repack import main as repack_main  # noqa: E402

# =============================================================================


@pytest.mark.parametrize(
    "lut_width, lut_inputs",
    [
        ("1", "0"),
        ("1", "1"),
        ("1", "2"),
        ("1", "3"),
    ],
)
def test_lut_padding(monkeypatch, lut_width, lut_inputs):
    """
    Tests repacking of a single lut with some inputs unconnected. Verifies
    results against golden references.
    """

    basedir = os.path.dirname(__file__)

    qlfpga_plugins = os.path.join(
        basedir, "..", "..", "..", "..", "..", "..", "build", "quicklogic", "third_party", "qlfpga-symbiflow-plugins"
    )

    vpr_arch = os.path.join(qlfpga_plugins, "qlf_k4n8/slow/vpr_arch/UMC22nm_vpr.xml")
    repacking_rules = os.path.join(qlfpga_plugins, "qlf_k4n8/repacking_rules.json")

    eblif_ref = os.path.join(basedir, "lut{}_{}.golden.eblif".format(lut_width, lut_inputs))
    eblif_in = os.path.join(basedir, "lut{}.eblif".format(lut_width))
    net_in = os.path.join(basedir, "lut{}_{}.net".format(lut_width, lut_inputs))

    with tempfile.TemporaryDirectory() as tempdir:
        eblif_out = os.path.join(tempdir, "out.eblif")
        net_out = os.path.join(tempdir, "out.net")

        # Substitute commandline arguments
        monkeypatch.setattr(
            "sys.argv",
            [
                "repack.py",
                "--vpr-arch",
                vpr_arch,
                "--repacking-rules",
                repacking_rules,
                "--eblif-in",
                eblif_in,
                "--net-in",
                net_in,
                "--eblif-out",
                eblif_out,
                "--net-out",
                net_out,
            ],
        )

        # Invoke the repacker
        repack_main()

        # Compare output with the golden reference
        with open(eblif_ref, "r") as fp:
            golden_data = fp.read().rstrip()
        with open(eblif_out, "r") as fp:
            output_data = fp.read().rstrip()

        assert golden_data == output_data