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Florian Stecker
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172
bitvec.h
172
bitvec.h
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/*********************************************************************
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* Filename: bitvec.h
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* Filename: bitvec.h
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*
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* Description: Bit vectors implemented as uint64_t arrays, size
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* fixed at compile time (in weylconfig.h). Supports
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* efficient set operations: Union, difference, count.
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* Uses SSE4 64-bit popcount instruction.
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* Description: Bit vectors implemented as uint64_t arrays, size
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* fixed at compile time (in weylconfig.h). Supports
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* efficient set operations: Union, difference, count.
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* Uses SSE4 64-bit popcount instruction.
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*
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* Author: David Dumas <david@dumas.io>
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* Author: David Dumas <david@dumas.io>
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*
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* This program is free software distributed under the MIT license.
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* See the file LICENSE for details.
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@ -33,164 +33,164 @@
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#define INDEX(n) ((n)%64)
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typedef struct {
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uint64_t v[BV_RANK];
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uint64_t v[BV_RANK];
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} bitvec_t;
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static inline void bv_clear_bit(bitvec_t *x, int k)
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{
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x->v[BLOCK(k)] &= ~BIT(INDEX(k));
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x->v[BLOCK(k)] &= ~BIT(INDEX(k));
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}
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static inline void bv_set_bit(bitvec_t *x, int k)
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{
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x->v[BLOCK(k)] |= BIT(INDEX(k));
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x->v[BLOCK(k)] |= BIT(INDEX(k));
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}
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static inline int bv_get_bit(const bitvec_t *x, int k)
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{
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return (x->v[BLOCK(k)] >> INDEX(k)) & 0x1;
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return (x->v[BLOCK(k)] >> INDEX(k)) & 0x1;
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}
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static inline void bv_clear(bitvec_t *x)
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{
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int i;
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for (i=0;i<BV_RANK;i++)
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x->v[i] = 0;
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int i;
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for (i=0;i<BV_RANK;i++)
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x->v[i] = 0;
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}
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static inline int bv_is_zero(const bitvec_t *x)
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{
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int i;
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for (i=0;i<BV_RANK;i++)
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if (x->v[i])
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return 0;
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int i;
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for (i=0;i<BV_RANK;i++)
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if (x->v[i])
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return 0;
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return 1;
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return 1;
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}
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static inline void bv_print(FILE *f, const bitvec_t *x, int len)
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{
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for(int i = 0; i < len; i++) {
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fputc(bv_get_bit(x, i) ? '1' : '0', f);
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// if(i % BLOCKSIZE == BLOCKSIZE - 1)
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// fputc('-',f);
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}
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for(int i = 0; i < len; i++) {
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fputc(bv_get_bit(x, i) ? '1' : '0', f);
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// if(i % BLOCKSIZE == BLOCKSIZE - 1)
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// fputc('-',f);
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}
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}
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static inline void bv_print_nice(FILE *f, const bitvec_t *pos, const bitvec_t *neg, int special, int len)
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{
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for(int i = 0; i < len; i++) {
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if(i == special)
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fputc('X', f);
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else if(bv_get_bit(pos, i) && !bv_get_bit(neg, i))
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fputc('1', f);
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else if(!bv_get_bit(pos, i) && bv_get_bit(neg, i))
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fputc('0', f);
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else if(!bv_get_bit(pos, i) && !bv_get_bit(neg, i))
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fputc(' ', f);
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else
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fputc('-', f);
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}
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for(int i = 0; i < len; i++) {
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if(i == special)
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fputc('X', f);
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else if(bv_get_bit(pos, i) && !bv_get_bit(neg, i))
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fputc('1', f);
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else if(!bv_get_bit(pos, i) && bv_get_bit(neg, i))
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fputc('0', f);
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else if(!bv_get_bit(pos, i) && !bv_get_bit(neg, i))
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fputc(' ', f);
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else
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fputc('-', f);
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}
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}
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static inline void bv_union(const bitvec_t *x, const bitvec_t *y, bitvec_t *result)
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{
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int i;
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for (i=0; i < BV_RANK; i++) {
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result->v[i] = x->v[i] | y->v[i];
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}
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int i;
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for (i=0; i < BV_RANK; i++) {
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result->v[i] = x->v[i] | y->v[i];
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}
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}
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static inline void bv_intersection(const bitvec_t *x, const bitvec_t *y, bitvec_t *result)
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{
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int i;
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for (i=0; i < BV_RANK; i++) {
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result->v[i] = x->v[i] & y->v[i];
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}
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int i;
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for (i=0; i < BV_RANK; i++) {
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result->v[i] = x->v[i] & y->v[i];
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}
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}
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static inline void bv_difference(const bitvec_t *x, const bitvec_t *y, bitvec_t *result)
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{
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int i;
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for (i=0; i < BV_RANK; i++) {
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result->v[i] = x->v[i] & ~y->v[i];
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}
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int i;
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for (i=0; i < BV_RANK; i++) {
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result->v[i] = x->v[i] & ~y->v[i];
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}
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}
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static inline int bv_disjoint(const bitvec_t *x, const bitvec_t *y)
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{
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for(int i = 0; i < BV_RANK; i++)
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if(x->v[i] & y->v[i])
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return 0;
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for(int i = 0; i < BV_RANK; i++)
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if(x->v[i] & y->v[i])
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return 0;
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return 1;
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return 1;
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}
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static inline int bv_full(const bitvec_t *x, int len)
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{
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int i;
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for(i = 0; i < BLOCK(len); i++)
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if(x->v[i] != ALLBITS)
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return 0;
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int i;
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for(i = 0; i < BLOCK(len); i++)
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if(x->v[i] != ALLBITS)
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return 0;
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return (x->v[i] & FIRSTBITS(INDEX(len))) == FIRSTBITS(INDEX(len));
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return (x->v[i] & FIRSTBITS(INDEX(len))) == FIRSTBITS(INDEX(len));
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}
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// set bits in range start...end (including start and excluding end)
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static inline void bv_set_range(bitvec_t *x, int start, int end)
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{
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if(BLOCK(start) == BLOCK(end))
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x->v[BLOCK(start)] |= ~FIRSTBITS(INDEX(start)) & FIRSTBITS(INDEX(end));
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else {
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x->v[BLOCK(start)] |= ~FIRSTBITS(INDEX(start));
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for(int i = BLOCK(start) + 1; i < BLOCK(end); i++)
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x->v[i] = ALLBITS;
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x->v[BLOCK(end)] |= FIRSTBITS(INDEX(end));
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}
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if(BLOCK(start) == BLOCK(end))
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x->v[BLOCK(start)] |= ~FIRSTBITS(INDEX(start)) & FIRSTBITS(INDEX(end));
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else {
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x->v[BLOCK(start)] |= ~FIRSTBITS(INDEX(start));
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for(int i = BLOCK(start) + 1; i < BLOCK(end); i++)
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x->v[i] = ALLBITS;
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x->v[BLOCK(end)] |= FIRSTBITS(INDEX(end));
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}
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}
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// set bits in range start...end (including start and excluding end), except if they are set in mask
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static inline void bv_set_range_except(bitvec_t *x, const bitvec_t *mask, int start, int end)
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{
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if(BLOCK(start) == BLOCK(end))
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x->v[BLOCK(start)] |= ~FIRSTBITS(INDEX(start)) & FIRSTBITS(INDEX(end)) & ~mask->v[BLOCK(start)];
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else {
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x->v[BLOCK(start)] |= ~FIRSTBITS(INDEX(start)) & ~mask->v[BLOCK(start)];
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for(int i = BLOCK(start) + 1; i < BLOCK(end); i++)
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x->v[i] |= ~mask->v[i];
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x->v[BLOCK(end)] |= FIRSTBITS(INDEX(end)) & ~mask->v[BLOCK(end)];
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}
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if(BLOCK(start) == BLOCK(end))
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x->v[BLOCK(start)] |= ~FIRSTBITS(INDEX(start)) & FIRSTBITS(INDEX(end)) & ~mask->v[BLOCK(start)];
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else {
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x->v[BLOCK(start)] |= ~FIRSTBITS(INDEX(start)) & ~mask->v[BLOCK(start)];
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for(int i = BLOCK(start) + 1; i < BLOCK(end); i++)
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x->v[i] |= ~mask->v[i];
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x->v[BLOCK(end)] |= FIRSTBITS(INDEX(end)) & ~mask->v[BLOCK(end)];
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}
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}
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// find least significant 0 bit starting from position start (included)
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static inline int bv_next_zero(const bitvec_t *x, int start)
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{
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int position;
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int position;
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position = ffsll(~(x->v[BLOCK(start)] | FIRSTBITS(INDEX(start))));
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position = ffsll(~(x->v[BLOCK(start)] | FIRSTBITS(INDEX(start))));
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if(position)
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return BLOCK(start)*BV_BLOCKSIZE + position - 1; // found zero in same chunk
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if(position)
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return BLOCK(start)*BV_BLOCKSIZE + position - 1; // found zero in same chunk
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for(int i = BLOCK(start) + 1; i < BV_RANK; i++) {
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position = ffsll(~x->v[i]);
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if(position) // found a 0
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return i*BV_BLOCKSIZE + position - 1;
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}
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for(int i = BLOCK(start) + 1; i < BV_RANK; i++) {
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position = ffsll(~x->v[i]);
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if(position) // found a 0
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return i*BV_BLOCKSIZE + position - 1;
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}
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return BV_RANK*BV_BLOCKSIZE; // found nothing
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return BV_RANK*BV_BLOCKSIZE; // found nothing
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}
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static inline void bv_copy(const bitvec_t *from, bitvec_t *to)
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{
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for(int i = 0; i < BV_RANK; i++)
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to->v[i] = from->v[i];
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for(int i = 0; i < BV_RANK; i++)
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to->v[i] = from->v[i];
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}
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static inline void bv_negate(const bitvec_t *from, bitvec_t *to)
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{
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for(int i = 0; i < BV_RANK; i++)
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to->v[i] = ~from->v[i];
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for(int i = 0; i < BV_RANK; i++)
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to->v[i] = ~from->v[i];
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}
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#endif /* __BITVEC_H__ */
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