Enrico Fraccaroli
40 lines
1.9 KiB
C
40 lines
1.9 KiB
C
/// @file bitops.h
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/// @brief Bitmasks functions.
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/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#pragma once
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#define bit_set(V, B) ((V) | (1U << (B))) ///< Sets the given bit.
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#define bit_clear(V, B) ((V) & ~(1U << (B))) ///< Clears the given bit.
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#define bit_flip(V, B) ((V) ^ (1U << (B))) ///< Flips the given bit.
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#define bit_set_assign(V, B) ((V) |= (1U << (B))) ///< Sets the given bit, permanently.
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#define bit_clear_assign(V, B) ((V) &= ~(1U << (B))) ///< Clears the given bit, permanently.
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#define bit_flip_assign(V, B) ((V) ^= (1U << (B))) ///< Flips the given bit, permanently.
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#define bit_check(V, B) ((V) & (1U << (B))) ///< Checks if the given bit is 1.
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#define bitmask_set(V, M) ((V) | (M)) ///< Sets the bits identified by the mask.
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#define bitmask_clear(V, M) ((V) & ~(M)) ///< Clears the bits identified by the mask.
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#define bitmask_flip(V, M) ((V) ^ (M)) ///< Flips the bits identified by the mask.
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#define bitmask_set_assign(V, M) ((V) |= (M)) ///< Sets the bits identified by the mask, permanently.
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#define bitmask_clear_assign(V, M) ((V) &= ~(M)) ///< Clears the bits identified by the mask, permanently.
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#define bitmask_flip_assign(V, M) ((V) ^= (M)) ///< Flips the bits identified by the mask, permanently.
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#define bitmask_check(V, M) ((V) & (M)) ///< Checks if the bits identified by the mask are all 1.
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/// @brief Finds the first bit at zero, starting from the less significative bit.
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static inline int find_first_zero(unsigned long value)
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{
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for (int i = 0; i < 32; ++i)
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if (!bit_check(value, i))
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return i;
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return 0;
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}
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/// @brief Finds the first bit not zero, starting from the less significative bit.
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static inline int find_first_non_zero(unsigned long value)
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{
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for (int i = 0; i < 32; ++i)
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if (bit_check(value, i))
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return i;
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return 0;
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} |