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# SPDX-FileCopyrightText: Copyright 2022 Arm Limited and/or its affiliates <open-source-office@arm.com>
#
# SPDX-License-Identifier: Apache-2.0
#
# 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
#
# 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.
#
# Description:
# Unit tests for scaling
from ethosu.vela.scaling import quantise_scale
from ethosu.vela.scaling import reduced_quantise_scale
def test_scaling():
multiplier, shift = quantise_scale(1)
assert multiplier == 1073741824 and shift == 30
multiplier, shift = quantise_scale(0.5)
assert multiplier == 1073741824 and shift == 31
multiplier, shift = quantise_scale(0.001)
assert multiplier == 1099511628 and shift == 40
multiplier, shift = quantise_scale(0.008)
assert multiplier == 1099511628 and shift == 37
multiplier, shift = quantise_scale(0.00097652)
assert multiplier == 2147390190 and shift == 41
multiplier, shift = quantise_scale(0.0009765615959827986)
assert multiplier == 2147481660 and shift == 41
def test_reduced_scaling():
multiplier, shift = reduced_quantise_scale(1)
assert multiplier == 16384 and shift == 14
multiplier, shift = reduced_quantise_scale(0.5)
assert multiplier == 16384 and shift == 15
multiplier, shift = reduced_quantise_scale(0.001)
assert multiplier == 16777 and shift == 24
multiplier, shift = reduced_quantise_scale(0.008)
assert multiplier == 16777 and shift == 21
multiplier, shift = reduced_quantise_scale(0.00097652)
assert multiplier == 32767 and shift == 25
# multiplier saturated
multiplier, shift = reduced_quantise_scale(0.0009765615959827986)
assert multiplier == 32767 and shift == 25
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