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intbitset_impl.c
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Mon, Nov 11, 12:08

intbitset_impl.c
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// This file is part of Invenio.
// Copyright (C) 2007, 2008, 2009, 2010, 2011 CERN.
//
// Invenio is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// Invenio is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Invenio; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "intbitset.h"
const int wordbytesize = sizeof(word_t);
const int wordbitsize = sizeof(word_t) * 8;
const int maxelem = INT_MAX;
IntBitSet *intBitSetCreate(register const int size, const bool_t trailing_bits) {
register word_t *base;
register word_t *end;
IntBitSet *ret = PyMem_Malloc(sizeof(IntBitSet));
// fprintf(stderr, "intBitSetCreate called\n");
// At least one word -> the one who represent the trailing_bits
ret->allocated = (size / wordbitsize + 1);
ret->size = 0; // trailing_bits
ret->trailing_bits = trailing_bits ? (word_t) ~0 : 0;
if (trailing_bits) {
base = ret->bitset = PyMem_Malloc(ret->allocated * wordbytesize);
end = base + ret->allocated;
for (; base < end; ++base)
*base = (word_t) ~0;
ret->tot = -1;
} else {
base = ret->bitset = PyMem_Malloc(ret->allocated * wordbytesize);
end = base + ret->allocated;
for (; base < end; ++base)
*base = (word_t) 0;
ret->tot = 0;
}
return ret;
}
IntBitSet *intBitSetResetFromBuffer(IntBitSet *const bitset, const void *const buf, const Py_ssize_t bufsize) {
// fprintf(stderr, "intBitSetResetFromBuffer called\n");
register Py_ssize_t newallocate = bufsize/wordbytesize;
if (newallocate > bitset->allocated) {
PyMem_Free(bitset->bitset);
bitset->bitset = PyMem_Malloc(bufsize);
}
bitset->allocated = newallocate;
bitset->tot = -1;
bitset->size = bitset->allocated - 1;
memcpy(bitset->bitset, buf, bufsize);
bitset->trailing_bits = *(bitset->bitset + bitset->allocated - 1) ? (word_t) ~0 : 0;
return bitset;
}
IntBitSet *intBitSetReset(IntBitSet *const bitset) {
// fprintf(stderr, "intBitSetReset called\n");
// NOTE: soft reset the memory. Instead of freeing it, which is slow
// simply declare in the intbitset that the allocated memory is one only
// word, and zero that word, so that as soon as more memory is needed
// a realloc will be triggered.
bitset->allocated = 1;
bitset->size = -1;
*bitset->bitset = 0;
bitset->trailing_bits = 0;
bitset->tot = 0;
return bitset;
}
IntBitSet *intBitSetCreateFromBuffer(const void *const buf, const Py_ssize_t bufsize) {
// fprintf(stderr, "intBitSetCreateFromBuffer called\n");
IntBitSet *ret = PyMem_Malloc(sizeof(IntBitSet));
ret->allocated = bufsize/wordbytesize;
ret->bitset = PyMem_Malloc(bufsize);
ret->size = ret->allocated - 1;;
ret->tot = -1;
memcpy(ret->bitset, buf, bufsize);
ret->trailing_bits = *(ret->bitset + ret->allocated - 1) ? (word_t) ~0 : 0;
return ret;
}
void intBitSetDestroy(IntBitSet *const bitset) {
// fprintf(stderr, "intBitSetDestroy called\n");
if (bitset) {
if (bitset->bitset)
PyMem_Free(bitset->bitset);
PyMem_Free(bitset);
}
}
IntBitSet *intBitSetClone(const IntBitSet * const bitset) {
// fprintf(stderr, "intBitSetClone called\n");
IntBitSet *ret = PyMem_Malloc(sizeof(IntBitSet));
ret->size = bitset->size;
ret->tot = bitset->tot;
ret->trailing_bits = bitset->trailing_bits;
ret->allocated = bitset->allocated;
ret->bitset = PyMem_Malloc(bitset->allocated * wordbytesize);
memcpy(ret->bitset, bitset->bitset, bitset->allocated * wordbytesize);
return ret;
}
int intBitSetGetSize(IntBitSet * const bitset) {
register word_t *base;
register word_t *end;
if (bitset->size >= 0)
return bitset->size;
base = bitset->bitset;
end = bitset->bitset + bitset->allocated - 2;
for (; base < end && *end == bitset->trailing_bits; --end);
bitset->size = ((int) (end - base) + 1);
return bitset->size;
}
int intBitSetGetTot(IntBitSet *const bitset) {
register word_t* base;
#ifndef __GNUC__
register int i;
#endif
register int tot;
register word_t *end;
if (bitset->trailing_bits)
return -1;
if (bitset->tot < 0) {
end = bitset->bitset + bitset->allocated;
tot = 0;
for (base = bitset->bitset; base < end; ++base)
if (*base)
#ifdef __GNUC__
// See:
// <http://stackoverflow.com/questions/109023/best-algorithm-to-count-the-number-of-set-bits-in-a-32-bit-integer>
tot += __builtin_popcountll(*base);
#else
for (i=0; i<wordbitsize; ++i)
if ((*base & ((word_t) 1 << i)) != 0) {
++tot;
}
#endif
bitset->tot = tot;
}
return bitset->tot;
}
int intBitSetGetAllocated(const IntBitSet * const bitset) {
return bitset->allocated;
}
void intBitSetResize(IntBitSet *const bitset, register const unsigned int allocated) {
// fprintf(stderr, "intBitSetResize called\n");
register word_t *base;
register word_t *end;
register word_t trailing_bits;
if (allocated > bitset->allocated) {
bitset->bitset = PyMem_Realloc(bitset->bitset, allocated * wordbytesize);
base = bitset->bitset + bitset->allocated;
end = bitset->bitset + allocated;
trailing_bits = bitset->trailing_bits;
for (; base<end; ++base)
*(base) = trailing_bits;
bitset->allocated = allocated;
}
}
bool_t intBitSetIsInElem(const IntBitSet * const bitset, register const unsigned int elem) {
return ((elem < bitset->allocated * wordbitsize) ?
(bitset->bitset[elem / wordbitsize] & ((word_t) 1 << ((word_t)elem % (word_t)wordbitsize))) != 0 : bitset->trailing_bits != 0);
}
void intBitSetAddElem(IntBitSet *const bitset, register const unsigned int elem) {
if (elem >= (bitset->allocated - 1) * wordbitsize) {
if (bitset->trailing_bits)
return;
else
intBitSetResize(bitset, (elem + elem/10)/wordbitsize+2);
}
bitset->bitset[elem / wordbitsize] |= ((word_t) 1 << (elem % wordbitsize));
bitset->tot = -1;
bitset->size = -1;
}
void intBitSetDelElem(IntBitSet *const bitset, register const unsigned int elem) {
if (elem >= (bitset->allocated - 1) * wordbitsize) {
if (!bitset->trailing_bits)
return;
else
intBitSetResize(bitset, (elem + elem/10)/wordbitsize+2);
}
bitset->bitset[elem / wordbitsize] &= (word_t) ~((word_t) 1 << (elem % wordbitsize));
bitset->tot = -1;
bitset->size = -1;
}
bool_t intBitSetEmpty(const IntBitSet *const bitset) {
register word_t *end;
register word_t *base;
if (bitset->trailing_bits) return 0;
if (bitset->tot == 0) return 1;
end = bitset->bitset + bitset->allocated;
for (base = bitset->bitset; base < end; ++base)
if (*base) return 0;
return 1;
}
int intBitSetAdaptMax(IntBitSet *const x, IntBitSet *const y) {
// Good idea but broken, it is kept for better time...
// register int sizex = intBitSetGetSize(x);
// register int sizey = intBitSetGetSize(y);
// register int sizemax = ((sizex > sizey) ? sizex : sizey) + 1;
// if (sizemax > x->allocated)
// intBitSetResize(x, sizemax);
// if (sizemax > y->allocated)
// intBitSetResize(y, sizemax);
// return sizemax;*/
register int allocated = (x->allocated > y->allocated) ? x->allocated : y->allocated;
if (allocated > x->allocated)
intBitSetResize(x, allocated);
if (allocated > y->allocated)
intBitSetResize(y, allocated);
return allocated;
}
int intBitSetAdaptMin(IntBitSet *const x, IntBitSet *const y) {
register int sizex;
register int sizey;
if (x->trailing_bits || y->trailing_bits)
return intBitSetAdaptMax(x, y);
sizex = intBitSetGetSize(x);
sizey = intBitSetGetSize(y);
return ((sizex < sizey) ? sizex : sizey) + 1;
}
IntBitSet *intBitSetUnion(IntBitSet *const x, IntBitSet *const y) {
register word_t *xbase;
register word_t *xend;
register word_t *ybase;
register word_t *retbase;
register IntBitSet * ret = PyMem_Malloc(sizeof (IntBitSet));
ret->allocated = intBitSetAdaptMax(x, y);
xbase = x->bitset;
xend = x->bitset+ret->allocated;
ybase = y->bitset;
retbase = ret->bitset = PyMem_Malloc(wordbytesize * ret->allocated);
ret->size = -1;
ret->tot = -1;
for (; xbase < xend; ++xbase, ++ybase, ++retbase)
*(retbase) = *(xbase) | *(ybase);
ret->trailing_bits = x->trailing_bits | y->trailing_bits;
return ret;
}
IntBitSet *intBitSetXor(IntBitSet *const x, IntBitSet *const y) {
register word_t *xbase;
register word_t *xend;
register word_t *ybase;
register word_t *retbase;
register IntBitSet * ret = PyMem_Malloc(sizeof (IntBitSet));
ret->allocated = intBitSetAdaptMax(x, y);
xbase = x->bitset;
xend = x->bitset+ret->allocated;
ybase = y->bitset;
retbase = ret->bitset = PyMem_Malloc(wordbytesize * ret->allocated);
ret->size = -1;
ret->tot = -1;
for (; xbase < xend; ++xbase, ++ybase, ++retbase)
*(retbase) = *(xbase) ^ *(ybase);
ret->trailing_bits = x->trailing_bits ^ y->trailing_bits;
return ret;
}
IntBitSet *intBitSetIntersection(IntBitSet *const x, IntBitSet *const y) {
register word_t *xbase;
register word_t *xend;
register word_t *ybase;
register word_t *retbase;
register IntBitSet * ret = PyMem_Malloc(sizeof (IntBitSet));
ret->allocated = intBitSetAdaptMin(x, y);
xbase = x->bitset;
xend = x->bitset+ret->allocated;
ybase = y->bitset;
retbase = ret->bitset = PyMem_Malloc(wordbytesize * ret->allocated);
ret->size = -1;
ret->tot = -1;
for (; xbase < xend; ++xbase, ++ybase, ++retbase)
*(retbase) = *(xbase) & *(ybase);
ret->trailing_bits = x->trailing_bits & y->trailing_bits;
return ret;
}
IntBitSet *intBitSetSub(IntBitSet *const x, IntBitSet *const y) {
register word_t *xbase;
register word_t *ybase;
register word_t *retbase;
register word_t *retend;
register IntBitSet * ret = PyMem_Malloc(sizeof (IntBitSet));
register int tmpsize = intBitSetAdaptMin(x, y);
register word_t trailing_bits;
ret->allocated = x->allocated > tmpsize ? x->allocated : tmpsize;
xbase = x->bitset;
ybase = y->bitset;
retbase = ret->bitset = PyMem_Malloc(wordbytesize * ret->allocated);
retend = ret->bitset+tmpsize;
ret->size = -1;
ret->tot = -1;
for (; retbase < retend; ++xbase, ++ybase, ++retbase)
*(retbase) = *(xbase) & ~*(ybase);
retend = ret->bitset+ret->allocated;
trailing_bits = y->trailing_bits;
for (; retbase < retend; ++xbase, ++retbase)
*retbase = *xbase & ~trailing_bits;
ret->trailing_bits = x->trailing_bits & ~y->trailing_bits;
return ret;
}
IntBitSet *intBitSetIUnion(IntBitSet *const dst, IntBitSet *const src) {
register word_t *dstbase;
register word_t *srcbase;
register word_t *srcend;
register int allocated = intBitSetAdaptMax(dst, src);
dstbase = dst->bitset;
srcbase = src->bitset;
srcend = src->bitset + allocated;
for (; srcbase < srcend; ++dstbase, ++srcbase)
*dstbase |= *srcbase;
dst->size = -1;
dst->tot = -1;
dst->trailing_bits |= src->trailing_bits;
return dst;
}
IntBitSet *intBitSetIXor(IntBitSet *const dst, IntBitSet *const src) {
register word_t *dstbase;
register word_t *srcbase;
register word_t *srcend;
register int allocated = intBitSetAdaptMax(dst, src);
dstbase = dst->bitset;
srcbase = src->bitset;
srcend = src->bitset + allocated;
for (; srcbase < srcend; ++dstbase, ++srcbase)
*dstbase ^= *srcbase;
dst->size = -1;
dst->tot = -1;
dst->trailing_bits ^= src->trailing_bits;
return dst;
}
IntBitSet *intBitSetIIntersection(IntBitSet *const dst, IntBitSet *const src) {
register word_t *dstbase;
register word_t *srcbase;
register word_t *dstend;
dst->allocated = intBitSetAdaptMin(dst, src);
dstbase = dst->bitset;
srcbase = src->bitset;
dstend = dst->bitset + dst->allocated;
for (; dstbase < dstend; ++dstbase, ++srcbase)
*dstbase &= *srcbase;
dst->size = -1;
dst->tot = -1;
dst->trailing_bits &= src->trailing_bits;
return dst;
}
IntBitSet *intBitSetISub(IntBitSet *const dst, IntBitSet *const src) {
register word_t *dstbase;
register word_t *srcbase;
register word_t *dstend;
register int allocated = intBitSetAdaptMin(dst, src);
register word_t trailing_bits;
dstbase = dst->bitset;
srcbase = src->bitset;
dstend = dst->bitset + allocated;
for (; dstbase < dstend; ++dstbase, ++srcbase)
*dstbase &= ~*srcbase;
dstend = dst->bitset + dst->allocated;
trailing_bits = src->trailing_bits;
for (; dstbase < dstend; ++dstbase)
*dstbase &= ~trailing_bits;
dst->size = -1;
dst->tot = -1;
dst->trailing_bits &= ~src->trailing_bits;
return dst;
}
int intBitSetGetLast(const IntBitSet *const x) {
register word_t *base = x->bitset;
register word_t *end = x->bitset + x->allocated;
register int i;
if (x->trailing_bits) return -2;
while (base < end) {
if (*(--end))
for (i=wordbitsize-1; i>=0; --i)
if ((*end & ((word_t) 1 << (word_t) i)))
return (int) i + (int) (end - x->bitset) * wordbitsize;
}
return -1;
}
int intBitSetGetNext(const IntBitSet *const x, register int last) {
register word_t *base = x->bitset + (++last / wordbitsize);
register int i = last % wordbitsize;
register word_t *end = x->bitset + x->allocated;
while(base < end) {
if (*base)
for (; i<wordbitsize; ++i)
if ((*base & ((word_t) 1 << (word_t) i)))
return (int) i + (int) (base - x->bitset) * wordbitsize;
i = 0;
++base;
}
return x->trailing_bits ? last : -2;
}
unsigned char intBitSetCmp(IntBitSet *const x, IntBitSet *const y) {
register word_t *xbase;
register word_t *xend;
register word_t *ybase;
register unsigned char ret = 0;
register int allocated = intBitSetAdaptMax(x, y);
xbase = x->bitset;
xend = x->bitset+allocated;
ybase = y->bitset;
for (; ret != 3 && xbase<xend; ++xbase, ++ybase)
ret |= (*ybase != (*xbase | *ybase)) * 2 + (*xbase != (*xbase | *ybase));
ret |= (y->trailing_bits != (x->trailing_bits | y->trailing_bits)) * 2 + (x->trailing_bits != (x->trailing_bits | y->trailing_bits));
return ret;
}

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