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#define ZEND_BITSET_ELM_SIZE sizeof(zend_ulong) #if SIZEOF_ZEND_LONG == 4 # define ZEND_BITSET_ELM_NUM(n) ((n) >> 5) # define ZEND_BITSET_BIT_NUM(n) ((zend_ulong)(n) & Z_UL(0x1f)) #elif SIZEOF_ZEND_LONG == 8 # define ZEND_BITSET_ELM_NUM(n) ((n) >> 6) # define ZEND_BITSET_BIT_NUM(n) ((zend_ulong)(n) & Z_UL(0x3f)) #else # define ZEND_BITSET_ELM_NUM(n) ((n) / (sizeof(zend_long) * 8)) # define ZEND_BITSET_BIT_NUM(n) ((n) % (sizeof(zend_long) * 8)) #endif #define ZEND_BITSET_ALLOCA(n, use_heap) \ (zend_bitset)do_alloca((n) * ZEND_BITSET_ELM_SIZE, use_heap) /* Number of trailing zero bits (0x01 -> 0; 0x40 -> 6; 0x00 -> LEN) */ static zend_always_inline int zend_ulong_ntz(zend_ulong num) { #if (defined(__GNUC__) || __has_builtin(__builtin_ctzl)) \ && SIZEOF_ZEND_LONG == SIZEOF_LONG && defined(PHP_HAVE_BUILTIN_CTZL) return __builtin_ctzl(num); #elif (defined(__GNUC__) || __has_builtin(__builtin_ctzll)) && defined(PHP_HAVE_BUILTIN_CTZLL) return __builtin_ctzll(num); #elif defined(_WIN32) unsigned long index; #if defined(_WIN64) if (!BitScanForward64(&index, num)) { #else if (!BitScanForward(&index, num)) { #endif /* undefined behavior */ return SIZEOF_ZEND_LONG * 8; } return (int) index; #else int n; if (num == Z_UL(0)) return SIZEOF_ZEND_LONG * 8; n = 1; #if SIZEOF_ZEND_LONG == 8 if ((num & 0xffffffff) == 0) {n += 32; num = num >> Z_UL(32);} #endif if ((num & 0x0000ffff) == 0) {n += 16; num = num >> 16;} if ((num & 0x000000ff) == 0) {n += 8; num = num >> 8;} if ((num & 0x0000000f) == 0) {n += 4; num = num >> 4;} if ((num & 0x00000003) == 0) {n += 2; num = num >> 2;} return n - (num & 1); #endif } /* Number of leading zero bits (Undefined for zero) */ static zend_always_inline int zend_ulong_nlz(zend_ulong num) { #if (defined(__GNUC__) || __has_builtin(__builtin_clzl)) \ && SIZEOF_ZEND_LONG == SIZEOF_LONG && defined(PHP_HAVE_BUILTIN_CLZL) return __builtin_clzl(num); #elif (defined(__GNUC__) || __has_builtin(__builtin_clzll)) && defined(PHP_HAVE_BUILTIN_CLZLL) return __builtin_clzll(num); #elif defined(_WIN32) unsigned long index; #if defined(_WIN64) if (!BitScanReverse64(&index, num)) { #else if (!BitScanReverse(&index, num)) { #endif /* undefined behavior */ return SIZEOF_ZEND_LONG * 8; } return (int) (SIZEOF_ZEND_LONG * 8 - 1)- index; #else zend_ulong x; int n; #if SIZEOF_ZEND_LONG == 8 n = 64; x = num >> 32; if (x != 0) {n -= 32; num = x;} #else n = 32; #endif x = num >> 16; if (x != 0) {n -= 16; num = x;} x = num >> 8; if (x != 0) {n -= 8; num = x;} x = num >> 4; if (x != 0) {n -= 4; num = x;} x = num >> 2; if (x != 0) {n -= 2; num = x;} x = num >> 1; if (x != 0) return n - 2; return n - num; #endif } /* Returns the number of zend_ulong words needed to store a bitset that is N bits long. */ static inline uint32_t zend_bitset_len(uint32_t n) { return (n + ((sizeof(zend_long) * 8) - 1)) / (sizeof(zend_long) * 8); } static inline bool zend_bitset_in(zend_bitset set, uint32_t n) { return ZEND_BIT_TEST(set, n); } static inline void zend_bitset_incl(zend_bitset set, uint32_t n) { set[ZEND_BITSET_ELM_NUM(n)] |= Z_UL(1) << ZEND_BITSET_BIT_NUM(n); } static inline void zend_bitset_excl(zend_bitset set, uint32_t n) { set[ZEND_BITSET_ELM_NUM(n)] &= ~(Z_UL(1) << ZEND_BITSET_BIT_NUM(n)); } static inline void zend_bitset_clear(zend_bitset set, uint32_t len) { memset(set, 0, len * ZEND_BITSET_ELM_SIZE); } static inline bool zend_bitset_empty(zend_bitset set, uint32_t len) { uint32_t i; for (i = 0; i < len; i++) { if (set[i]) { return 0; } } return 1; } static inline void zend_bitset_fill(zend_bitset set, uint32_t len) { memset(set, 0xff, len * ZEND_BITSET_ELM_SIZE); } static inline bool zend_bitset_equal(zend_bitset set1, zend_bitset set2, uint32_t len) { return memcmp(set1, set2, len * ZEND_BITSET_ELM_SIZE) == 0; } static inline void zend_bitset_copy(zend_bitset set1, zend_bitset set2, uint32_t len) { memcpy(set1, set2, len * ZEND_BITSET_ELM_SIZE); } static inline void zend_bitset_intersection(zend_bitset set1, zend_bitset set2, uint32_t len) { uint32_t i; for (i = 0; i < len; i++) { set1[i] &= set2[i]; } } static inline void zend_bitset_union(zend_bitset set1, zend_bitset set2, uint32_t len) { uint32_t i; for (i = 0; i < len; i++) { set1[i] |= set2[i]; } } static inline void zend_bitset_difference(zend_bitset set1, zend_bitset set2, uint32_t len) { uint32_t i; for (i = 0; i < len; i++) { set1[i] = set1[i] & ~set2[i]; } } static inline void zend_bitset_union_with_intersection(zend_bitset set1, zend_bitset set2, zend_bitset set3, zend_bitset set4, uint32_t len) { uint32_t i; for (i = 0; i < len; i++) { set1[i] = set2[i] | (set3[i] & set4[i]); } } static inline void zend_bitset_union_with_difference(zend_bitset set1, zend_bitset set2, zend_bitset set3, zend_bitset set4, uint32_t len) { uint32_t i; for (i = 0; i < len; i++) { set1[i] = set2[i] | (set3[i] & ~set4[i]); } } static inline bool zend_bitset_subset(zend_bitset set1, zend_bitset set2, uint32_t len) { uint32_t i; for (i = 0; i < len; i++) { if (set1[i] & ~set2[i]) { return 0; } } return 1; } static inline int zend_bitset_first(zend_bitset set, uint32_t len) { uint32_t i; for (i = 0; i < len; i++) { if (set[i]) { return ZEND_BITSET_ELM_SIZE * 8 * i + zend_ulong_ntz(set[i]); } } return -1; /* empty set */ } static inline int zend_bitset_last(zend_bitset set, uint32_t len) { uint32_t i = len; while (i > 0) { i--; if (set[i]) { int j = ZEND_BITSET_ELM_SIZE * 8 * i - 1; zend_ulong x = set[i]; while (x != Z_UL(0)) { x = x >> Z_UL(1); j++; } return j; } } return -1; /* empty set */ } #define ZEND_BITSET_FOREACH(set, len, bit) do { \ zend_bitset _set = (set); \ uint32_t _i, _len = (len); \ for (_i = 0; _i < _len; _i++) { \ zend_ulong _x = _set[_i]; \ if (_x) { \ (bit) = ZEND_BITSET_ELM_SIZE * 8 * _i; \ for (; _x != 0; _x >>= Z_UL(1), (bit)++) { \ if (!(_x & Z_UL(1))) continue; #define ZEND_BITSET_REVERSE_FOREACH(set, len, bit) do { \ zend_bitset _set = (set); \ uint32_t _i = (len); \ zend_ulong _test = Z_UL(1) << (ZEND_BITSET_ELM_SIZE * 8 - 1); \ while (_i-- > 0) { \ zend_ulong _x = _set[_i]; \ if (_x) { \ (bit) = ZEND_BITSET_ELM_SIZE * 8 * (_i + 1) - 1; \ for (; _x != 0; _x <<= Z_UL(1), (bit)--) { \ if (!(_x & _test)) continue; \ #define ZEND_BITSET_FOREACH_END() \ } \ } \ } \ } while (0) static inline int zend_bitset_pop_first(zend_bitset set, uint32_t len) { int i = zend_bitset_first(set, len); if (i >= 0) { zend_bitset_excl(set, i); } return i; } #endif /* _ZEND_BITSET_H_ */