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45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
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// Copyright 2023 The RE2 Authors. All Rights Reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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#include "re2/bitmap256.h"
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#include <stdint.h>
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#include "util/logging.h"
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#include "util/util.h"
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namespace re2 {
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int Bitmap256::FindNextSetBit(int c) const {
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DCHECK_GE(c, 0);
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DCHECK_LE(c, 255);
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// Check the word that contains the bit. Mask out any lower bits.
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int i = c / 64;
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uint64_t word = words_[i] & (~uint64_t{0} << (c % 64));
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if (word != 0)
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return (i * 64) + FindLSBSet(word);
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// Check any following words.
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i++;
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switch (i) {
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case 1:
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if (words_[1] != 0)
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return (1 * 64) + FindLSBSet(words_[1]);
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FALLTHROUGH_INTENDED;
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case 2:
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if (words_[2] != 0)
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return (2 * 64) + FindLSBSet(words_[2]);
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FALLTHROUGH_INTENDED;
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case 3:
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if (words_[3] != 0)
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return (3 * 64) + FindLSBSet(words_[3]);
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FALLTHROUGH_INTENDED;
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default:
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return -1;
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}
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}
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} // namespace re2
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