85 lines
2.3 KiB
C++
85 lines
2.3 KiB
C++
/* Copyright (C) 2012-2013 Kevin Shanahan
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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See file, 'COPYING', for details.
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*/
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#ifndef VIS_LEAFBITS_H
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#define VIS_LEAFBITS_H
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#include <stdlib.h>
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#include <string.h>
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#include <common/cmdlib.hh>
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/* Use some GCC builtins */
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#if !defined(ffsl) && defined(__GNUC__)
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#define ffsl __builtin_ffsl
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#elif defined(WIN32)
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#include <intrin.h>
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inline int ffsl(long int val)
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{
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unsigned long indexout;
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unsigned char res = _BitScanForward(&indexout, val);
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if (!res) return 0;
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else return indexout + 1;
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}
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#endif
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#ifndef offsetof
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#define offsetof(type, member) __builtin_offsetof(type, member)
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#endif
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typedef unsigned long leafblock_t;
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typedef struct {
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int numleafs;
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leafblock_t bits[]; /* Variable Sized */
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} leafbits_t;
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#define QBYTESHIFT(x) ((x) == 8 ? 6 : ((x) == 4 ? 5 : 0 ))
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#define LEAFSHIFT QBYTESHIFT(sizeof(leafblock_t))
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static_assert(LEAFSHIFT != 0, "unsupported sizeof(unsigned long)");
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#define LEAFMASK ((sizeof(leafblock_t) << 3) - 1UL)
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static inline int
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TestLeafBit(const leafbits_t *bits, int leafnum)
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{
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return !!(bits->bits[leafnum >> LEAFSHIFT] & (1UL << (leafnum & LEAFMASK)));
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}
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static inline void
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SetLeafBit(leafbits_t *bits, int leafnum)
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{
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bits->bits[leafnum >> LEAFSHIFT] |= 1UL << (leafnum & LEAFMASK);
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}
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static inline void
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ClearLeafBit(leafbits_t *bits, int leafnum)
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{
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bits->bits[leafnum >> LEAFSHIFT] &= ~(1UL << (leafnum & LEAFMASK));
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}
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static inline size_t
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LeafbitsSize(int numleafs)
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{
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int numblocks = (numleafs + LEAFMASK) >> LEAFSHIFT;
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return sizeof(leafbits_t) + (sizeof(leafblock_t) * numblocks);
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}
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#endif /* VIS_LEAFBITS_H */
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