828 lines
18 KiB
C
828 lines
18 KiB
C
/* Array bitsets.
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Copyright (C) 2002-2003, 2006, 2009-2012 Free Software Foundation,
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Inc.
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Contributed by Michael Hayes (m.hayes@elec.canterbury.ac.nz).
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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 3 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, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include "abitset.h"
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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/* This file implements fixed size bitsets stored as an array
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of words. Any unused bits in the last word must be zero. */
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#define ABITSET_N_WORDS(N) (((N) + BITSET_WORD_BITS - 1) / BITSET_WORD_BITS)
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#define ABITSET_WORDS(X) ((X)->a.words)
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static bitset_bindex
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abitset_resize (bitset src, bitset_bindex size)
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{
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/* These bitsets have a fixed size. */
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if (BITSET_SIZE_ (src) != size)
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abort ();
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return size;
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}
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/* Find list of up to NUM bits set in BSET starting from and including
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*NEXT and store in array LIST. Return with actual number of bits
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found and with *NEXT indicating where search stopped. */
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static bitset_bindex
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abitset_small_list (bitset src, bitset_bindex *list,
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bitset_bindex num, bitset_bindex *next)
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{
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bitset_bindex bitno;
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bitset_bindex count;
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bitset_windex size;
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bitset_word word;
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word = ABITSET_WORDS (src)[0];
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/* Short circuit common case. */
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if (!word)
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return 0;
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size = BITSET_SIZE_ (src);
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bitno = *next;
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if (bitno >= size)
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return 0;
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word >>= bitno;
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/* If num is 1, we could speed things up with a binary search
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of the word of interest. */
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if (num >= BITSET_WORD_BITS)
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{
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for (count = 0; word; bitno++)
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{
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if (word & 1)
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list[count++] = bitno;
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word >>= 1;
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}
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}
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else
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{
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for (count = 0; word; bitno++)
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{
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if (word & 1)
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{
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list[count++] = bitno;
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if (count >= num)
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{
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bitno++;
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break;
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}
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}
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word >>= 1;
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}
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}
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*next = bitno;
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return count;
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}
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/* Set bit BITNO in bitset DST. */
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static void
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abitset_set (bitset dst ATTRIBUTE_UNUSED, bitset_bindex bitno ATTRIBUTE_UNUSED)
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{
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/* This should never occur for abitsets since we should always hit
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the cache. It is likely someone is trying to access outside the
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bounds of the bitset. */
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abort ();
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}
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/* Reset bit BITNO in bitset DST. */
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static void
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abitset_reset (bitset dst ATTRIBUTE_UNUSED,
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bitset_bindex bitno ATTRIBUTE_UNUSED)
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{
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/* This should never occur for abitsets since we should always hit
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the cache. It is likely someone is trying to access outside the
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bounds of the bitset. Since the bit is zero anyway, let it pass. */
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}
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/* Test bit BITNO in bitset SRC. */
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static bool
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abitset_test (bitset src ATTRIBUTE_UNUSED,
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bitset_bindex bitno ATTRIBUTE_UNUSED)
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{
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/* This should never occur for abitsets since we should always
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hit the cache. */
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return false;
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}
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/* Find list of up to NUM bits set in BSET in reverse order, starting
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from and including NEXT and store in array LIST. Return with
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actual number of bits found and with *NEXT indicating where search
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stopped. */
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static bitset_bindex
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abitset_list_reverse (bitset src, bitset_bindex *list,
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bitset_bindex num, bitset_bindex *next)
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{
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bitset_bindex bitno;
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bitset_bindex rbitno;
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bitset_bindex count;
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bitset_windex windex;
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unsigned int bitcnt;
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bitset_bindex bitoff;
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bitset_word *srcp = ABITSET_WORDS (src);
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bitset_bindex n_bits = BITSET_SIZE_ (src);
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rbitno = *next;
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/* If num is 1, we could speed things up with a binary search
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of the word of interest. */
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if (rbitno >= n_bits)
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return 0;
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count = 0;
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bitno = n_bits - (rbitno + 1);
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windex = bitno / BITSET_WORD_BITS;
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bitcnt = bitno % BITSET_WORD_BITS;
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bitoff = windex * BITSET_WORD_BITS;
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do
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{
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bitset_word word;
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word = srcp[windex] << (BITSET_WORD_BITS - 1 - bitcnt);
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for (; word; bitcnt--)
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{
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if (word & BITSET_MSB)
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{
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list[count++] = bitoff + bitcnt;
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if (count >= num)
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{
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*next = n_bits - (bitoff + bitcnt);
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return count;
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}
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}
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word <<= 1;
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}
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bitoff -= BITSET_WORD_BITS;
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bitcnt = BITSET_WORD_BITS - 1;
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}
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while (windex--);
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*next = n_bits - (bitoff + 1);
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return count;
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}
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/* Find list of up to NUM bits set in BSET starting from and including
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*NEXT and store in array LIST. Return with actual number of bits
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found and with *NEXT indicating where search stopped. */
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static bitset_bindex
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abitset_list (bitset src, bitset_bindex *list,
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bitset_bindex num, bitset_bindex *next)
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{
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bitset_bindex bitno;
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bitset_bindex count;
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bitset_windex windex;
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bitset_bindex bitoff;
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bitset_windex size = src->b.csize;
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bitset_word *srcp = ABITSET_WORDS (src);
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bitset_word word;
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bitno = *next;
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count = 0;
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if (!bitno)
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{
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/* Many bitsets are zero, so make this common case fast. */
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for (windex = 0; windex < size && !srcp[windex]; windex++)
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continue;
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if (windex >= size)
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return 0;
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/* If num is 1, we could speed things up with a binary search
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of the current word. */
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bitoff = windex * BITSET_WORD_BITS;
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}
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else
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{
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if (bitno >= BITSET_SIZE_ (src))
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return 0;
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windex = bitno / BITSET_WORD_BITS;
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bitno = bitno % BITSET_WORD_BITS;
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if (bitno)
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{
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/* Handle the case where we start within a word.
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Most often, this is executed with large bitsets
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with many set bits where we filled the array
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on the previous call to this function. */
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bitoff = windex * BITSET_WORD_BITS;
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word = srcp[windex] >> bitno;
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for (bitno = bitoff + bitno; word; bitno++)
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{
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if (word & 1)
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{
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list[count++] = bitno;
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if (count >= num)
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{
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*next = bitno + 1;
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return count;
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}
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}
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word >>= 1;
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}
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windex++;
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}
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bitoff = windex * BITSET_WORD_BITS;
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}
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for (; windex < size; windex++, bitoff += BITSET_WORD_BITS)
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{
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if (!(word = srcp[windex]))
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continue;
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if ((count + BITSET_WORD_BITS) < num)
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{
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for (bitno = bitoff; word; bitno++)
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{
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if (word & 1)
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list[count++] = bitno;
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word >>= 1;
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}
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}
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else
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{
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for (bitno = bitoff; word; bitno++)
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{
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if (word & 1)
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{
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list[count++] = bitno;
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if (count >= num)
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{
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*next = bitno + 1;
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return count;
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}
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}
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word >>= 1;
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}
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}
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}
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*next = bitoff;
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return count;
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}
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/* Ensure that any unused bits within the last word are clear. */
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static inline void
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abitset_unused_clear (bitset dst)
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{
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unsigned int last_bit;
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last_bit = BITSET_SIZE_ (dst) % BITSET_WORD_BITS;
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if (last_bit)
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ABITSET_WORDS (dst)[dst->b.csize - 1] &=
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((bitset_word) 1 << last_bit) - 1;
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}
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static void
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abitset_ones (bitset dst)
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{
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bitset_word *dstp = ABITSET_WORDS (dst);
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size_t bytes;
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bytes = sizeof (bitset_word) * dst->b.csize;
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memset (dstp, -1, bytes);
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abitset_unused_clear (dst);
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}
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static void
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abitset_zero (bitset dst)
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{
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bitset_word *dstp = ABITSET_WORDS (dst);
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size_t bytes;
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bytes = sizeof (bitset_word) * dst->b.csize;
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memset (dstp, 0, bytes);
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}
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static bool
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abitset_empty_p (bitset dst)
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{
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bitset_windex i;
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bitset_word *dstp = ABITSET_WORDS (dst);
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for (i = 0; i < dst->b.csize; i++)
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if (dstp[i])
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return false;
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return true;
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}
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static void
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abitset_copy1 (bitset dst, bitset src)
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{
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bitset_word *srcp = ABITSET_WORDS (src);
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bitset_word *dstp = ABITSET_WORDS (dst);
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bitset_windex size = dst->b.csize;
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if (srcp == dstp)
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return;
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memcpy (dstp, srcp, sizeof (bitset_word) * size);
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}
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static void
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abitset_not (bitset dst, bitset src)
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{
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bitset_windex i;
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bitset_word *srcp = ABITSET_WORDS (src);
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bitset_word *dstp = ABITSET_WORDS (dst);
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bitset_windex size = dst->b.csize;
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for (i = 0; i < size; i++)
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*dstp++ = ~(*srcp++);
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abitset_unused_clear (dst);
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}
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static bool
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abitset_equal_p (bitset dst, bitset src)
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{
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bitset_windex i;
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bitset_word *srcp = ABITSET_WORDS (src);
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bitset_word *dstp = ABITSET_WORDS (dst);
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bitset_windex size = dst->b.csize;
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for (i = 0; i < size; i++)
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if (*srcp++ != *dstp++)
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return false;
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return true;
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}
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static bool
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abitset_subset_p (bitset dst, bitset src)
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{
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bitset_windex i;
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bitset_word *srcp = ABITSET_WORDS (src);
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bitset_word *dstp = ABITSET_WORDS (dst);
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bitset_windex size = dst->b.csize;
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for (i = 0; i < size; i++, dstp++, srcp++)
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if (*dstp != (*srcp | *dstp))
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return false;
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return true;
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}
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static bool
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abitset_disjoint_p (bitset dst, bitset src)
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{
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bitset_windex i;
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bitset_word *srcp = ABITSET_WORDS (src);
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bitset_word *dstp = ABITSET_WORDS (dst);
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bitset_windex size = dst->b.csize;
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for (i = 0; i < size; i++)
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if (*srcp++ & *dstp++)
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return false;
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return true;
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}
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static void
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abitset_and (bitset dst, bitset src1, bitset src2)
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{
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bitset_windex i;
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bitset_word *src1p = ABITSET_WORDS (src1);
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bitset_word *src2p = ABITSET_WORDS (src2);
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bitset_word *dstp = ABITSET_WORDS (dst);
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bitset_windex size = dst->b.csize;
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for (i = 0; i < size; i++)
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*dstp++ = *src1p++ & *src2p++;
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}
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static bool
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abitset_and_cmp (bitset dst, bitset src1, bitset src2)
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{
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bitset_windex i;
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bool changed = false;
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bitset_word *src1p = ABITSET_WORDS (src1);
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bitset_word *src2p = ABITSET_WORDS (src2);
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bitset_word *dstp = ABITSET_WORDS (dst);
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bitset_windex size = dst->b.csize;
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for (i = 0; i < size; i++, dstp++)
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{
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bitset_word tmp = *src1p++ & *src2p++;
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if (*dstp != tmp)
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{
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changed = true;
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*dstp = tmp;
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}
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}
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return changed;
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}
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static void
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abitset_andn (bitset dst, bitset src1, bitset src2)
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{
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bitset_windex i;
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bitset_word *src1p = ABITSET_WORDS (src1);
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bitset_word *src2p = ABITSET_WORDS (src2);
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bitset_word *dstp = ABITSET_WORDS (dst);
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bitset_windex size = dst->b.csize;
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for (i = 0; i < size; i++)
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*dstp++ = *src1p++ & ~(*src2p++);
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}
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static bool
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abitset_andn_cmp (bitset dst, bitset src1, bitset src2)
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{
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bitset_windex i;
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bool changed = false;
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bitset_word *src1p = ABITSET_WORDS (src1);
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bitset_word *src2p = ABITSET_WORDS (src2);
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bitset_word *dstp = ABITSET_WORDS (dst);
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bitset_windex size = dst->b.csize;
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for (i = 0; i < size; i++, dstp++)
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{
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bitset_word tmp = *src1p++ & ~(*src2p++);
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if (*dstp != tmp)
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{
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changed = true;
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*dstp = tmp;
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}
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}
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return changed;
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}
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static void
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abitset_or (bitset dst, bitset src1, bitset src2)
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{
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bitset_windex i;
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bitset_word *src1p = ABITSET_WORDS (src1);
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bitset_word *src2p = ABITSET_WORDS (src2);
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bitset_word *dstp = ABITSET_WORDS (dst);
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bitset_windex size = dst->b.csize;
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for (i = 0; i < size; i++)
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*dstp++ = *src1p++ | *src2p++;
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}
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static bool
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abitset_or_cmp (bitset dst, bitset src1, bitset src2)
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{
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bitset_windex i;
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bool changed = false;
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bitset_word *src1p = ABITSET_WORDS (src1);
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bitset_word *src2p = ABITSET_WORDS (src2);
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bitset_word *dstp = ABITSET_WORDS (dst);
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bitset_windex size = dst->b.csize;
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for (i = 0; i < size; i++, dstp++)
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{
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bitset_word tmp = *src1p++ | *src2p++;
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if (*dstp != tmp)
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{
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changed = true;
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*dstp = tmp;
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}
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}
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return changed;
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}
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static void
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abitset_xor (bitset dst, bitset src1, bitset src2)
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{
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bitset_windex i;
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bitset_word *src1p = ABITSET_WORDS (src1);
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bitset_word *src2p = ABITSET_WORDS (src2);
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bitset_word *dstp = ABITSET_WORDS (dst);
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bitset_windex size = dst->b.csize;
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for (i = 0; i < size; i++)
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*dstp++ = *src1p++ ^ *src2p++;
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}
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static bool
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abitset_xor_cmp (bitset dst, bitset src1, bitset src2)
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{
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bitset_windex i;
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bool changed = false;
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bitset_word *src1p = ABITSET_WORDS (src1);
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bitset_word *src2p = ABITSET_WORDS (src2);
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bitset_word *dstp = ABITSET_WORDS (dst);
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bitset_windex size = dst->b.csize;
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for (i = 0; i < size; i++, dstp++)
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{
|
|
bitset_word tmp = *src1p++ ^ *src2p++;
|
|
|
|
if (*dstp != tmp)
|
|
{
|
|
changed = true;
|
|
*dstp = tmp;
|
|
}
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
|
|
static void
|
|
abitset_and_or (bitset dst, bitset src1, bitset src2, bitset src3)
|
|
{
|
|
bitset_windex i;
|
|
bitset_word *src1p = ABITSET_WORDS (src1);
|
|
bitset_word *src2p = ABITSET_WORDS (src2);
|
|
bitset_word *src3p = ABITSET_WORDS (src3);
|
|
bitset_word *dstp = ABITSET_WORDS (dst);
|
|
bitset_windex size = dst->b.csize;
|
|
|
|
for (i = 0; i < size; i++)
|
|
*dstp++ = (*src1p++ & *src2p++) | *src3p++;
|
|
}
|
|
|
|
|
|
static bool
|
|
abitset_and_or_cmp (bitset dst, bitset src1, bitset src2, bitset src3)
|
|
{
|
|
bitset_windex i;
|
|
bool changed = false;
|
|
bitset_word *src1p = ABITSET_WORDS (src1);
|
|
bitset_word *src2p = ABITSET_WORDS (src2);
|
|
bitset_word *src3p = ABITSET_WORDS (src3);
|
|
bitset_word *dstp = ABITSET_WORDS (dst);
|
|
bitset_windex size = dst->b.csize;
|
|
|
|
for (i = 0; i < size; i++, dstp++)
|
|
{
|
|
bitset_word tmp = (*src1p++ & *src2p++) | *src3p++;
|
|
|
|
if (*dstp != tmp)
|
|
{
|
|
changed = true;
|
|
*dstp = tmp;
|
|
}
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
|
|
static void
|
|
abitset_andn_or (bitset dst, bitset src1, bitset src2, bitset src3)
|
|
{
|
|
bitset_windex i;
|
|
bitset_word *src1p = ABITSET_WORDS (src1);
|
|
bitset_word *src2p = ABITSET_WORDS (src2);
|
|
bitset_word *src3p = ABITSET_WORDS (src3);
|
|
bitset_word *dstp = ABITSET_WORDS (dst);
|
|
bitset_windex size = dst->b.csize;
|
|
|
|
for (i = 0; i < size; i++)
|
|
*dstp++ = (*src1p++ & ~(*src2p++)) | *src3p++;
|
|
}
|
|
|
|
|
|
static bool
|
|
abitset_andn_or_cmp (bitset dst, bitset src1, bitset src2, bitset src3)
|
|
{
|
|
bitset_windex i;
|
|
bool changed = false;
|
|
bitset_word *src1p = ABITSET_WORDS (src1);
|
|
bitset_word *src2p = ABITSET_WORDS (src2);
|
|
bitset_word *src3p = ABITSET_WORDS (src3);
|
|
bitset_word *dstp = ABITSET_WORDS (dst);
|
|
bitset_windex size = dst->b.csize;
|
|
|
|
for (i = 0; i < size; i++, dstp++)
|
|
{
|
|
bitset_word tmp = (*src1p++ & ~(*src2p++)) | *src3p++;
|
|
|
|
if (*dstp != tmp)
|
|
{
|
|
changed = true;
|
|
*dstp = tmp;
|
|
}
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
|
|
static void
|
|
abitset_or_and (bitset dst, bitset src1, bitset src2, bitset src3)
|
|
{
|
|
bitset_windex i;
|
|
bitset_word *src1p = ABITSET_WORDS (src1);
|
|
bitset_word *src2p = ABITSET_WORDS (src2);
|
|
bitset_word *src3p = ABITSET_WORDS (src3);
|
|
bitset_word *dstp = ABITSET_WORDS (dst);
|
|
bitset_windex size = dst->b.csize;
|
|
|
|
for (i = 0; i < size; i++)
|
|
*dstp++ = (*src1p++ | *src2p++) & *src3p++;
|
|
}
|
|
|
|
|
|
static bool
|
|
abitset_or_and_cmp (bitset dst, bitset src1, bitset src2, bitset src3)
|
|
{
|
|
bitset_windex i;
|
|
bool changed = false;
|
|
bitset_word *src1p = ABITSET_WORDS (src1);
|
|
bitset_word *src2p = ABITSET_WORDS (src2);
|
|
bitset_word *src3p = ABITSET_WORDS (src3);
|
|
bitset_word *dstp = ABITSET_WORDS (dst);
|
|
bitset_windex size = dst->b.csize;
|
|
|
|
for (i = 0; i < size; i++, dstp++)
|
|
{
|
|
bitset_word tmp = (*src1p++ | *src2p++) & *src3p++;
|
|
|
|
if (*dstp != tmp)
|
|
{
|
|
changed = true;
|
|
*dstp = tmp;
|
|
}
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
|
|
static void
|
|
abitset_copy (bitset dst, bitset src)
|
|
{
|
|
if (BITSET_COMPATIBLE_ (dst, src))
|
|
abitset_copy1 (dst, src);
|
|
else
|
|
bitset_copy_ (dst, src);
|
|
}
|
|
|
|
|
|
/* Vector of operations for single word bitsets. */
|
|
struct bitset_vtable abitset_small_vtable = {
|
|
abitset_set,
|
|
abitset_reset,
|
|
bitset_toggle_,
|
|
abitset_test,
|
|
abitset_resize,
|
|
bitset_size_,
|
|
bitset_count_,
|
|
abitset_empty_p,
|
|
abitset_ones,
|
|
abitset_zero,
|
|
abitset_copy,
|
|
abitset_disjoint_p,
|
|
abitset_equal_p,
|
|
abitset_not,
|
|
abitset_subset_p,
|
|
abitset_and,
|
|
abitset_and_cmp,
|
|
abitset_andn,
|
|
abitset_andn_cmp,
|
|
abitset_or,
|
|
abitset_or_cmp,
|
|
abitset_xor,
|
|
abitset_xor_cmp,
|
|
abitset_and_or,
|
|
abitset_and_or_cmp,
|
|
abitset_andn_or,
|
|
abitset_andn_or_cmp,
|
|
abitset_or_and,
|
|
abitset_or_and_cmp,
|
|
abitset_small_list,
|
|
abitset_list_reverse,
|
|
NULL,
|
|
BITSET_ARRAY
|
|
};
|
|
|
|
|
|
/* Vector of operations for multiple word bitsets. */
|
|
struct bitset_vtable abitset_vtable = {
|
|
abitset_set,
|
|
abitset_reset,
|
|
bitset_toggle_,
|
|
abitset_test,
|
|
abitset_resize,
|
|
bitset_size_,
|
|
bitset_count_,
|
|
abitset_empty_p,
|
|
abitset_ones,
|
|
abitset_zero,
|
|
abitset_copy,
|
|
abitset_disjoint_p,
|
|
abitset_equal_p,
|
|
abitset_not,
|
|
abitset_subset_p,
|
|
abitset_and,
|
|
abitset_and_cmp,
|
|
abitset_andn,
|
|
abitset_andn_cmp,
|
|
abitset_or,
|
|
abitset_or_cmp,
|
|
abitset_xor,
|
|
abitset_xor_cmp,
|
|
abitset_and_or,
|
|
abitset_and_or_cmp,
|
|
abitset_andn_or,
|
|
abitset_andn_or_cmp,
|
|
abitset_or_and,
|
|
abitset_or_and_cmp,
|
|
abitset_list,
|
|
abitset_list_reverse,
|
|
NULL,
|
|
BITSET_ARRAY
|
|
};
|
|
|
|
|
|
size_t
|
|
abitset_bytes (bitset_bindex n_bits)
|
|
{
|
|
bitset_windex size;
|
|
size_t bytes;
|
|
size_t header_size = offsetof (union bitset_union, a.words);
|
|
struct bitset_align_struct { char a; union bitset_union b; };
|
|
size_t bitset_alignment = offsetof (struct bitset_align_struct, b);
|
|
|
|
size = ABITSET_N_WORDS (n_bits);
|
|
bytes = header_size + size * sizeof (bitset_word);
|
|
|
|
/* Align the size properly for a vector of abitset objects. */
|
|
if (header_size % bitset_alignment != 0
|
|
|| sizeof (bitset_word) % bitset_alignment != 0)
|
|
{
|
|
bytes += bitset_alignment - 1;
|
|
bytes -= bytes % bitset_alignment;
|
|
}
|
|
|
|
return bytes;
|
|
}
|
|
|
|
|
|
bitset
|
|
abitset_init (bitset bset, bitset_bindex n_bits)
|
|
{
|
|
bitset_windex size;
|
|
|
|
size = ABITSET_N_WORDS (n_bits);
|
|
BITSET_NBITS_ (bset) = n_bits;
|
|
|
|
/* Use optimized routines if bitset fits within a single word.
|
|
There is probably little merit if using caching since
|
|
the small bitset will always fit in the cache. */
|
|
if (size == 1)
|
|
bset->b.vtable = &abitset_small_vtable;
|
|
else
|
|
bset->b.vtable = &abitset_vtable;
|
|
|
|
bset->b.cindex = 0;
|
|
bset->b.csize = size;
|
|
bset->b.cdata = ABITSET_WORDS (bset);
|
|
return bset;
|
|
}
|