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52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
/*
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* Copyright (c) 2014-2019, Pelion and affiliates.
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "nsconfig.h"
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#include "ns_types.h"
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#include "isqrt.h"
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/**
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* \brief Calculates integer square root
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*
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* Algorithm is from http://www.codecodex.com/wiki/Calculate_an_integer_square_root
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*
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* \param n number
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*
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* \return square root of the number (rounded down)
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*/
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uint32_t isqrt32(uint32_t n)
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{
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uint32_t root, remainder, place;
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root = 0;
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remainder = n;
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place = 0x40000000;
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while (place > remainder) {
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place = place >> 2;
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}
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while (place) {
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if (remainder >= root + place) {
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remainder = remainder - root - place;
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root = root + (place << 1);
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}
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root = root >> 1;
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place = place >> 2;
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}
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return root;
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}
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