55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
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/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file pbitops.h
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* @author drose
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* @date 2008-05-10
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*/
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#ifndef PBITOPS_H
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#define PBITOPS_H
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#include "pandabase.h"
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#include "numeric_types.h"
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#if defined(_MSC_VER) && !defined(CPPPARSER)
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#include <intrin.h>
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#endif
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// This file defines a few low-level bit-operation routines, optimized all to
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// heck.
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INLINE int count_bits_in_word(uint16_t x);
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INLINE int count_bits_in_word(uint32_t x);
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INLINE int count_bits_in_word(uint64_t x);
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INLINE uint16_t flood_bits_down(uint16_t x);
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INLINE uint32_t flood_bits_down(uint32_t x);
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INLINE uint64_t flood_bits_down(uint64_t x);
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INLINE uint16_t flood_bits_up(uint16_t x);
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INLINE uint32_t flood_bits_up(uint32_t x);
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INLINE uint64_t flood_bits_up(uint64_t x);
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INLINE int get_lowest_on_bit(uint16_t x);
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INLINE int get_lowest_on_bit(uint32_t x);
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INLINE int get_lowest_on_bit(uint64_t x);
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INLINE int get_highest_on_bit(uint16_t x);
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INLINE int get_highest_on_bit(uint32_t x);
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INLINE int get_highest_on_bit(uint64_t x);
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INLINE int get_next_higher_bit(uint16_t x);
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INLINE int get_next_higher_bit(uint32_t x);
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INLINE int get_next_higher_bit(uint64_t x);
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// This table precomputes the number of on bits in each 16-bit word.
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extern EXPCL_PANDA_PUTIL const unsigned char num_bits_on[65536];
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#include "pbitops.I"
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#endif
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