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34 lines
986 B
C
34 lines
986 B
C
/*
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* Copyright 2024 Google LLC
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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 "bitset.h"
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#include <stdint.h>
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uint8_t count_bits_set(uint8_t *bitset_bytes, int num_bits) {
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uint8_t num_bits_set = 0;
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int num_bytes = (num_bits + 7) / 8;
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if ((num_bits % 8) != 0) {
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bitset_bytes[num_bytes] &= ((0x1 << (num_bits)) - 1);
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}
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for (int i = 0; i < num_bytes; i++) {
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num_bits_set += __builtin_popcount(bitset_bytes[i]);
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}
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return (num_bits_set);
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}
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