src/intset.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "intset.h"
#include "zmalloc.h"

/* Note that these encodings are ordered, so:
 * INTSET_ENC_INT16 < INTSET_ENC_INT32 < INTSET_ENC_INT64. */
#define INTSET_ENC_INT16 (sizeof(int16_t))
#define INTSET_ENC_INT32 (sizeof(int32_t))
#define INTSET_ENC_INT64 (sizeof(int64_t))

/* Return the required encoding for the provided value. */
static uint8_t _intsetValueEncoding(int64_t v) {
    if (v < INT32_MIN || v > INT32_MAX)
        return INTSET_ENC_INT64;
    else if (v < INT16_MIN || v > INT16_MAX)
        return INTSET_ENC_INT32;
    return INTSET_ENC_INT16;
}

/* Return the value at pos, given an encoding. */
static int64_t _intsetGetEncoded(intset *is, int pos, uint8_t enc) {
    if (enc == INTSET_ENC_INT64)
        return ((int64_t*)is->contents)[pos];
    else if (enc == INTSET_ENC_INT32)
        return ((int32_t*)is->contents)[pos];
    return ((int16_t*)is->contents)[pos];
}

/* Return the value at pos, using the configured encoding. */
static int64_t _intsetGet(intset *is, int pos) {
    return _intsetGetEncoded(is,pos,is->encoding);
}

/* Set the value at pos, using the configured encoding. */
static void _intsetSet(intset *is, int pos, int64_t value) {
    if (is->encoding == INTSET_ENC_INT64)
        ((int64_t*)is->contents)[pos] = value;
    else if (is->encoding == INTSET_ENC_INT32)
        ((int32_t*)is->contents)[pos] = value;
    else
        ((int16_t*)is->contents)[pos] = value;
}

/* Create an empty intset. */
intset *intsetNew(void) {
    intset *is = zmalloc(sizeof(intset));
    is->encoding = INTSET_ENC_INT16;
    is->length = 0;
    return is;
}

/* Resize the intset */
static intset *intsetResize(intset *is, uint32_t len) {
    uint32_t size = len*is->encoding;
    is = zrealloc(is,sizeof(intset)+size);
    return is;
}

/* Search for the position of "value". Return 1 when the value was found and
 * sets "pos" to the position of the value within the intset. Return 0 when
 * the value is not present in the intset and sets "pos" to the position
 * where "value" can be inserted. */
static uint8_t intsetSearch(intset *is, int64_t value, uint32_t *pos) {
    int min = 0, max = is->length-1, mid = -1;
    int64_t cur = -1;

    /* The value can never be found when the set is empty */
    if (is->length == 0) {
        if (pos) *pos = 0;
        return 0;
    } else {
        /* Check for the case where we know we cannot find the value,
         * but do know the insert position. */
        if (value > _intsetGet(is,is->length-1)) {
            if (pos) *pos = is->length;
            return 0;
        } else if (value < _intsetGet(is,0)) {
            if (pos) *pos = 0;
            return 0;
        }
    }

    while(max >= min) {
        mid = (min+max)/2;
        cur = _intsetGet(is,mid);
        if (value > cur) {
            min = mid+1;
        } else if (value < cur) {
            max = mid-1;
        } else {
            break;
        }
    }

    if (value == cur) {
        if (pos) *pos = mid;
        return 1;
    } else {
        if (pos) *pos = min;
        return 0;
    }
}

/* Upgrades the intset to a larger encoding and inserts the given integer. */
static intset *intsetUpgradeAndAdd(intset *is, int64_t value) {
    uint8_t curenc = is->encoding;
    uint8_t newenc = _intsetValueEncoding(value);
    int length = is->length;
    int prepend = value < 0 ? 1 : 0;

    /* First set new encoding and resize */
    is->encoding = newenc;
    is = intsetResize(is,is->length+1);

    /* Upgrade back-to-front so we don't overwrite values.
     * Note that the "prepend" variable is used to make sure we have an empty
     * space at either the beginning or the end of the intset. */
    while(length--)
        _intsetSet(is,length+prepend,_intsetGetEncoded(is,length,curenc));

    /* Set the value at the beginning or the end. */
    if (prepend)
        _intsetSet(is,0,value);
    else
        _intsetSet(is,is->length,value);
    is->length++;
    return is;
}

static void intsetMoveTail(intset *is, uint32_t from, uint32_t to) {
    void *src, *dst;
    uint32_t bytes = is->length-from;
    if (is->encoding == INTSET_ENC_INT64) {
        src = (int64_t*)is->contents+from;
        dst = (int64_t*)is->contents+to;
        bytes *= sizeof(int64_t);
    } else if (is->encoding == INTSET_ENC_INT32) {
        src = (int32_t*)is->contents+from;
        dst = (int32_t*)is->contents+to;
        bytes *= sizeof(int32_t);
    } else {
        src = (int16_t*)is->contents+from;
        dst = (int16_t*)is->contents+to;
        bytes *= sizeof(int16_t);
    }
    memmove(dst,src,bytes);
}

/* Insert an integer in the intset */
intset *intsetAdd(intset *is, int64_t value, uint8_t *success) {
    uint8_t valenc = _intsetValueEncoding(value);
    uint32_t pos;
    if (success) *success = 1;

    /* Upgrade encoding if necessary. If we need to upgrade, we know that
     * this value should be either appended (if > 0) or prepended (if < 0),
     * because it lies outside the range of existing values. */
    if (valenc > is->encoding) {
        /* This always succeeds, so we don't need to curry *success. */
        return intsetUpgradeAndAdd(is,value);
    } else {
        /* Abort if the value is already present in the set.
         * This call will populate "pos" with the right position to insert
         * the value when it cannot be found. */
        if (intsetSearch(is,value,&pos)) {
            if (success) *success = 0;
            return is;
        }

        is = intsetResize(is,is->length+1);
        if (pos < is->length) intsetMoveTail(is,pos,pos+1);
    }

    _intsetSet(is,pos,value);
    is->length++;
    return is;
}

/* Delete integer from intset */
intset *intsetRemove(intset *is, int64_t value, uint8_t *success) {
    uint8_t valenc = _intsetValueEncoding(value);
    uint32_t pos;
    if (success) *success = 0;

    if (valenc <= is->encoding && intsetSearch(is,value,&pos)) {
        /* We know we can delete */
        if (success) *success = 1;

        /* Overwrite value with tail and update length */
        if (pos < (is->length-1)) intsetMoveTail(is,pos+1,pos);
        is = intsetResize(is,is->length-1);
        is->length--;
    }
    return is;
}

/* Determine whether a value belongs to this set */
uint8_t intsetFind(intset *is, int64_t value) {
    uint8_t valenc = _intsetValueEncoding(value);
    return valenc <= is->encoding && intsetSearch(is,value,NULL);
}

/* Return random member */
int64_t intsetRandom(intset *is) {
    return _intsetGet(is,rand()%is->length);
}

/* Sets the value to the value at the given position. When this position is
 * out of range the function returns 0, when in range it returns 1. */
uint8_t intsetGet(intset *is, uint32_t pos, int64_t *value) {
    if (pos < is->length) {
        *value = _intsetGet(is,pos);
        return 1;
    }
    return 0;
}

/* Return intset length */
uint32_t intsetLen(intset *is) {
    return is->length;
}

#ifdef INTSET_TEST_MAIN
#include <sys/time.h>

void intsetRepr(intset *is) {
    int i;
    for (i = 0; i < is->length; i++) {
        printf("%lld\n", (uint64_t)_intsetGet(is,i));
    }
    printf("\n");
}

void error(char *err) {
    printf("%s\n", err);
    exit(1);
}

void ok(void) {
    printf("OK\n");
}

long long usec(void) {
    struct timeval tv;
    gettimeofday(&tv,NULL);
    return (((long long)tv.tv_sec)*1000000)+tv.tv_usec;
}

#define assert(_e) ((_e)?(void)0:(_assert(#_e,__FILE__,__LINE__),exit(1)))
void _assert(char *estr, char *file, int line) {
    printf("\n\n=== ASSERTION FAILED ===\n");
    printf("==> %s:%d '%s' is not true\n",file,line,estr);
}

intset *createSet(int bits, int size) {
    uint64_t mask = (1<<bits)-1;
    uint64_t i, value;
    intset *is = intsetNew();

    for (i = 0; i < size; i++) {
        if (bits > 32) {
            value = (rand()*rand()) & mask;
        } else {
            value = rand() & mask;
        }
        is = intsetAdd(is,value,NULL);
    }
    return is;
}

void checkConsistency(intset *is) {
    int i;

    for (i = 0; i < (is->length-1); i++) {
        if (is->encoding == INTSET_ENC_INT16) {
            int16_t *i16 = (int16_t*)is->contents;
            assert(i16[i] < i16[i+1]);
        } else if (is->encoding == INTSET_ENC_INT32) {
            int32_t *i32 = (int32_t*)is->contents;
            assert(i32[i] < i32[i+1]);
        } else {
            int64_t *i64 = (int64_t*)is->contents;
            assert(i64[i] < i64[i+1]);
        }
    }
}

int main(int argc, char **argv) {
    uint8_t success;
    int i;
    intset *is;
    sranddev();

    printf("Value encodings: "); {
        assert(_intsetValueEncoding(-32768) == INTSET_ENC_INT16);
        assert(_intsetValueEncoding(+32767) == INTSET_ENC_INT16);
        assert(_intsetValueEncoding(-32769) == INTSET_ENC_INT32);
        assert(_intsetValueEncoding(+32768) == INTSET_ENC_INT32);
        assert(_intsetValueEncoding(-2147483648) == INTSET_ENC_INT32);
        assert(_intsetValueEncoding(+2147483647) == INTSET_ENC_INT32);
        assert(_intsetValueEncoding(-2147483649) == INTSET_ENC_INT64);
        assert(_intsetValueEncoding(+2147483648) == INTSET_ENC_INT64);
        assert(_intsetValueEncoding(-9223372036854775808ull) == INTSET_ENC_INT64);
        assert(_intsetValueEncoding(+9223372036854775807ull) == INTSET_ENC_INT64);
        ok();
    }

    printf("Basic adding: "); {
        is = intsetNew();
        is = intsetAdd(is,5,&success); assert(success);
        is = intsetAdd(is,6,&success); assert(success);
        is = intsetAdd(is,4,&success); assert(success);
        is = intsetAdd(is,4,&success); assert(!success);
        ok();
    }

    printf("Large number of random adds: "); {
        int inserts = 0;
        is = intsetNew();
        for (i = 0; i < 1024; i++) {
            is = intsetAdd(is,rand()%0x800,&success);
            if (success) inserts++;
        }
        assert(is->length == inserts);
        checkConsistency(is);
        ok();
    }

    printf("Upgrade from int16 to int32: "); {
        is = intsetNew();
        is = intsetAdd(is,32,NULL);
        assert(is->encoding == INTSET_ENC_INT16);
        is = intsetAdd(is,65535,NULL);
        assert(is->encoding == INTSET_ENC_INT32);
        assert(intsetFind(is,32));
        assert(intsetFind(is,65535));
        checkConsistency(is);

        is = intsetNew();
        is = intsetAdd(is,32,NULL);
        assert(is->encoding == INTSET_ENC_INT16);
        is = intsetAdd(is,-65535,NULL);
        assert(is->encoding == INTSET_ENC_INT32);
        assert(intsetFind(is,32));
        assert(intsetFind(is,-65535));
        checkConsistency(is);
        ok();
    }

    printf("Upgrade from int16 to int64: "); {
        is = intsetNew();
        is = intsetAdd(is,32,NULL);
        assert(is->encoding == INTSET_ENC_INT16);
        is = intsetAdd(is,4294967295,NULL);
        assert(is->encoding == INTSET_ENC_INT64);
        assert(intsetFind(is,32));
        assert(intsetFind(is,4294967295));
        checkConsistency(is);

        is = intsetNew();
        is = intsetAdd(is,32,NULL);
        assert(is->encoding == INTSET_ENC_INT16);
        is = intsetAdd(is,-4294967295,NULL);
        assert(is->encoding == INTSET_ENC_INT64);
        assert(intsetFind(is,32));
        assert(intsetFind(is,-4294967295));
        checkConsistency(is);
        ok();
    }

    printf("Upgrade from int32 to int64: "); {
        is = intsetNew();
        is = intsetAdd(is,65535,NULL);
        assert(is->encoding == INTSET_ENC_INT32);
        is = intsetAdd(is,4294967295,NULL);
        assert(is->encoding == INTSET_ENC_INT64);
        assert(intsetFind(is,65535));
        assert(intsetFind(is,4294967295));
        checkConsistency(is);

        is = intsetNew();
        is = intsetAdd(is,65535,NULL);
        assert(is->encoding == INTSET_ENC_INT32);
        is = intsetAdd(is,-4294967295,NULL);
        assert(is->encoding == INTSET_ENC_INT64);
        assert(intsetFind(is,65535));
        assert(intsetFind(is,-4294967295));
        checkConsistency(is);
        ok();
    }

    printf("Stress lookups: "); {
        long num = 100000, size = 10000;
        int i, bits = 20;
        long long start;
        is = createSet(bits,size);
        checkConsistency(is);

        start = usec();
        for (i = 0; i < num; i++) intsetSearch(is,rand() % ((1<<bits)-1),NULL);
        printf("%ld lookups, %ld element set, %lldusec\n",num,size,usec()-start);
    }

    printf("Stress add+delete: "); {
        int i, v1, v2;
        is = intsetNew();
        for (i = 0; i < 0xffff; i++) {
            v1 = rand() % 0xfff;
            is = intsetAdd(is,v1,NULL);
            assert(intsetFind(is,v1));

            v2 = rand() % 0xfff;
            is = intsetRemove(is,v2,NULL);
            assert(!intsetFind(is,v2));
        }
        checkConsistency(is);
        ok();
    }
}
#endif
Commit	Line	Data
	1	#include <stdio.h>
	2	#include <stdlib.h>
	3	#include <string.h>
	4	#include "intset.h"
	5	#include "zmalloc.h"
	6
	7	/* Note that these encodings are ordered, so:
	8	* INTSET_ENC_INT16 < INTSET_ENC_INT32 < INTSET_ENC_INT64. */
	9	#define INTSET_ENC_INT16 (sizeof(int16_t))
	10	#define INTSET_ENC_INT32 (sizeof(int32_t))
	11	#define INTSET_ENC_INT64 (sizeof(int64_t))
	12
	13	/* Return the required encoding for the provided value. */
	14	static uint8_t _intsetValueEncoding(int64_t v) {
	15	if (v < INT32_MIN \|\| v > INT32_MAX)
	16	return INTSET_ENC_INT64;
	17	else if (v < INT16_MIN \|\| v > INT16_MAX)
	18	return INTSET_ENC_INT32;
	19	return INTSET_ENC_INT16;
	20	}
	21
	22	/* Return the value at pos, given an encoding. */
	23	static int64_t _intsetGetEncoded(intset *is, int pos, uint8_t enc) {
	24	if (enc == INTSET_ENC_INT64)
	25	return ((int64_t*)is->contents)[pos];
	26	else if (enc == INTSET_ENC_INT32)
	27	return ((int32_t*)is->contents)[pos];
	28	return ((int16_t*)is->contents)[pos];
	29	}
	30
	31	/* Return the value at pos, using the configured encoding. */
	32	static int64_t _intsetGet(intset *is, int pos) {
	33	return _intsetGetEncoded(is,pos,is->encoding);
	34	}
	35
	36	/* Set the value at pos, using the configured encoding. */
	37	static void _intsetSet(intset *is, int pos, int64_t value) {
	38	if (is->encoding == INTSET_ENC_INT64)
	39	((int64_t*)is->contents)[pos] = value;
	40	else if (is->encoding == INTSET_ENC_INT32)
	41	((int32_t*)is->contents)[pos] = value;
	42	else
	43	((int16_t*)is->contents)[pos] = value;
	44	}
	45
	46	/* Create an empty intset. */
	47	intset *intsetNew(void) {
	48	intset *is = zmalloc(sizeof(intset));
	49	is->encoding = INTSET_ENC_INT16;
	50	is->length = 0;
	51	return is;
	52	}
	53
	54	/* Resize the intset */
	55	static intset intsetResize(intset is, uint32_t len) {
	56	uint32_t size = len*is->encoding;
	57	is = zrealloc(is,sizeof(intset)+size);
	58	return is;
	59	}
	60
	61	/* Search for the position of "value". Return 1 when the value was found and
	62	* sets "pos" to the position of the value within the intset. Return 0 when
	63	* the value is not present in the intset and sets "pos" to the position
	64	* where "value" can be inserted. */
	65	static uint8_t intsetSearch(intset is, int64_t value, uint32_t pos) {
	66	int min = 0, max = is->length-1, mid = -1;
	67	int64_t cur = -1;
	68
	69	/* The value can never be found when the set is empty */
	70	if (is->length == 0) {
	71	if (pos) *pos = 0;
	72	return 0;
	73	} else {
	74	/* Check for the case where we know we cannot find the value,
	75	* but do know the insert position. */
	76	if (value > _intsetGet(is,is->length-1)) {
	77	if (pos) *pos = is->length;
	78	return 0;
	79	} else if (value < _intsetGet(is,0)) {
	80	if (pos) *pos = 0;
	81	return 0;
	82	}
	83	}
	84
	85	while(max >= min) {
	86	mid = (min+max)/2;
	87	cur = _intsetGet(is,mid);
	88	if (value > cur) {
	89	min = mid+1;
	90	} else if (value < cur) {
	91	max = mid-1;
	92	} else {
	93	break;
	94	}
	95	}
	96
	97	if (value == cur) {
	98	if (pos) *pos = mid;
	99	return 1;
	100	} else {
	101	if (pos) *pos = min;
	102	return 0;
	103	}
	104	}
	105
	106	/* Upgrades the intset to a larger encoding and inserts the given integer. */
	107	static intset intsetUpgradeAndAdd(intset is, int64_t value) {
	108	uint8_t curenc = is->encoding;
	109	uint8_t newenc = _intsetValueEncoding(value);
	110	int length = is->length;
	111	int prepend = value < 0 ? 1 : 0;
	112
	113	/* First set new encoding and resize */
	114	is->encoding = newenc;
	115	is = intsetResize(is,is->length+1);
	116
	117	/* Upgrade back-to-front so we don't overwrite values.
	118	* Note that the "prepend" variable is used to make sure we have an empty
	119	* space at either the beginning or the end of the intset. */
	120	while(length--)
	121	_intsetSet(is,length+prepend,_intsetGetEncoded(is,length,curenc));
	122
	123	/* Set the value at the beginning or the end. */
	124	if (prepend)
	125	_intsetSet(is,0,value);
	126	else
	127	_intsetSet(is,is->length,value);
	128	is->length++;
	129	return is;
	130	}
	131
	132	static void intsetMoveTail(intset *is, uint32_t from, uint32_t to) {
	133	void src, dst;
	134	uint32_t bytes = is->length-from;
	135	if (is->encoding == INTSET_ENC_INT64) {
	136	src = (int64_t*)is->contents+from;
	137	dst = (int64_t*)is->contents+to;
	138	bytes *= sizeof(int64_t);
	139	} else if (is->encoding == INTSET_ENC_INT32) {
	140	src = (int32_t*)is->contents+from;
	141	dst = (int32_t*)is->contents+to;
	142	bytes *= sizeof(int32_t);
	143	} else {
	144	src = (int16_t*)is->contents+from;
	145	dst = (int16_t*)is->contents+to;
	146	bytes *= sizeof(int16_t);
	147	}
	148	memmove(dst,src,bytes);
	149	}
	150
	151	/* Insert an integer in the intset */
	152	intset intsetAdd(intset is, int64_t value, uint8_t *success) {
	153	uint8_t valenc = _intsetValueEncoding(value);
	154	uint32_t pos;
	155	if (success) *success = 1;
	156
	157	/* Upgrade encoding if necessary. If we need to upgrade, we know that
	158	* this value should be either appended (if > 0) or prepended (if < 0),
	159	* because it lies outside the range of existing values. */
	160	if (valenc > is->encoding) {
	161	/* This always succeeds, so we don't need to curry success. /
	162	return intsetUpgradeAndAdd(is,value);
	163	} else {
	164	/* Abort if the value is already present in the set.
	165	* This call will populate "pos" with the right position to insert
	166	* the value when it cannot be found. */
	167	if (intsetSearch(is,value,&pos)) {
	168	if (success) *success = 0;
	169	return is;
	170	}
	171
	172	is = intsetResize(is,is->length+1);
	173	if (pos < is->length) intsetMoveTail(is,pos,pos+1);
	174	}
	175
	176	_intsetSet(is,pos,value);
	177	is->length++;
	178	return is;
	179	}
	180
	181	/* Delete integer from intset */
	182	intset intsetRemove(intset is, int64_t value, uint8_t *success) {
	183	uint8_t valenc = _intsetValueEncoding(value);
	184	uint32_t pos;
	185	if (success) *success = 0;
	186
	187	if (valenc <= is->encoding && intsetSearch(is,value,&pos)) {
	188	/* We know we can delete */
	189	if (success) *success = 1;
	190
	191	/* Overwrite value with tail and update length */
	192	if (pos < (is->length-1)) intsetMoveTail(is,pos+1,pos);
	193	is = intsetResize(is,is->length-1);
	194	is->length--;
	195	}
	196	return is;
	197	}
	198
	199	/* Determine whether a value belongs to this set */
	200	uint8_t intsetFind(intset *is, int64_t value) {
	201	uint8_t valenc = _intsetValueEncoding(value);
	202	return valenc <= is->encoding && intsetSearch(is,value,NULL);
	203	}
	204
	205	/* Return random member */
	206	int64_t intsetRandom(intset *is) {
	207	return _intsetGet(is,rand()%is->length);
	208	}
	209
	210	/* Sets the value to the value at the given position. When this position is
	211	* out of range the function returns 0, when in range it returns 1. */
	212	uint8_t intsetGet(intset is, uint32_t pos, int64_t value) {
	213	if (pos < is->length) {
	214	*value = _intsetGet(is,pos);
	215	return 1;
	216	}
	217	return 0;
	218	}
	219
	220	/* Return intset length */
	221	uint32_t intsetLen(intset *is) {
	222	return is->length;
	223	}
	224
	225	#ifdef INTSET_TEST_MAIN
	226	#include <sys/time.h>
	227
	228	void intsetRepr(intset *is) {
	229	int i;
	230	for (i = 0; i < is->length; i++) {
	231	printf("%lld\n", (uint64_t)_intsetGet(is,i));
	232	}
	233	printf("\n");
	234	}
	235
	236	void error(char *err) {
	237	printf("%s\n", err);
	238	exit(1);
	239	}
	240
	241	void ok(void) {
	242	printf("OK\n");
	243	}
	244
	245	long long usec(void) {
	246	struct timeval tv;
	247	gettimeofday(&tv,NULL);
	248	return (((long long)tv.tv_sec)*1000000)+tv.tv_usec;
	249	}
	250
	251	#define assert(_e) ((_e)?(void)0:(_assert(#_e,__FILE__,__LINE__),exit(1)))
	252	void _assert(char estr, char file, int line) {
	253	printf("\n\n=== ASSERTION FAILED ===\n");
	254	printf("==> %s:%d '%s' is not true\n",file,line,estr);
	255	}
	256
	257	intset *createSet(int bits, int size) {
	258	uint64_t mask = (1<<bits)-1;
	259	uint64_t i, value;
	260	intset *is = intsetNew();
	261
	262	for (i = 0; i < size; i++) {
	263	if (bits > 32) {
	264	value = (rand()*rand()) & mask;
	265	} else {
	266	value = rand() & mask;
	267	}
	268	is = intsetAdd(is,value,NULL);
	269	}
	270	return is;
	271	}
	272
	273	void checkConsistency(intset *is) {
	274	int i;
	275
	276	for (i = 0; i < (is->length-1); i++) {
	277	if (is->encoding == INTSET_ENC_INT16) {
	278	int16_t i16 = (int16_t)is->contents;
	279	assert(i16[i] < i16[i+1]);
	280	} else if (is->encoding == INTSET_ENC_INT32) {
	281	int32_t i32 = (int32_t)is->contents;
	282	assert(i32[i] < i32[i+1]);
	283	} else {
	284	int64_t i64 = (int64_t)is->contents;
	285	assert(i64[i] < i64[i+1]);
	286	}
	287	}
	288	}
	289
	290	int main(int argc, char **argv) {
	291	uint8_t success;
	292	int i;
	293	intset *is;
	294	sranddev();
	295
	296	printf("Value encodings: "); {
	297	assert(_intsetValueEncoding(-32768) == INTSET_ENC_INT16);
	298	assert(_intsetValueEncoding(+32767) == INTSET_ENC_INT16);
	299	assert(_intsetValueEncoding(-32769) == INTSET_ENC_INT32);
	300	assert(_intsetValueEncoding(+32768) == INTSET_ENC_INT32);
	301	assert(_intsetValueEncoding(-2147483648) == INTSET_ENC_INT32);
	302	assert(_intsetValueEncoding(+2147483647) == INTSET_ENC_INT32);
	303	assert(_intsetValueEncoding(-2147483649) == INTSET_ENC_INT64);
	304	assert(_intsetValueEncoding(+2147483648) == INTSET_ENC_INT64);
	305	assert(_intsetValueEncoding(-9223372036854775808ull) == INTSET_ENC_INT64);
	306	assert(_intsetValueEncoding(+9223372036854775807ull) == INTSET_ENC_INT64);
	307	ok();
	308	}
	309
	310	printf("Basic adding: "); {
	311	is = intsetNew();
	312	is = intsetAdd(is,5,&success); assert(success);
	313	is = intsetAdd(is,6,&success); assert(success);
	314	is = intsetAdd(is,4,&success); assert(success);
	315	is = intsetAdd(is,4,&success); assert(!success);
	316	ok();
	317	}
	318
	319	printf("Large number of random adds: "); {
	320	int inserts = 0;
	321	is = intsetNew();
	322	for (i = 0; i < 1024; i++) {
	323	is = intsetAdd(is,rand()%0x800,&success);
	324	if (success) inserts++;
	325	}
	326	assert(is->length == inserts);
	327	checkConsistency(is);
	328	ok();
	329	}
	330
	331	printf("Upgrade from int16 to int32: "); {
	332	is = intsetNew();
	333	is = intsetAdd(is,32,NULL);
	334	assert(is->encoding == INTSET_ENC_INT16);
	335	is = intsetAdd(is,65535,NULL);
	336	assert(is->encoding == INTSET_ENC_INT32);
	337	assert(intsetFind(is,32));
	338	assert(intsetFind(is,65535));
	339	checkConsistency(is);
	340
	341	is = intsetNew();
	342	is = intsetAdd(is,32,NULL);
	343	assert(is->encoding == INTSET_ENC_INT16);
	344	is = intsetAdd(is,-65535,NULL);
	345	assert(is->encoding == INTSET_ENC_INT32);
	346	assert(intsetFind(is,32));
	347	assert(intsetFind(is,-65535));
	348	checkConsistency(is);
	349	ok();
	350	}
	351
	352	printf("Upgrade from int16 to int64: "); {
	353	is = intsetNew();
	354	is = intsetAdd(is,32,NULL);
	355	assert(is->encoding == INTSET_ENC_INT16);
	356	is = intsetAdd(is,4294967295,NULL);
	357	assert(is->encoding == INTSET_ENC_INT64);
	358	assert(intsetFind(is,32));
	359	assert(intsetFind(is,4294967295));
	360	checkConsistency(is);
	361
	362	is = intsetNew();
	363	is = intsetAdd(is,32,NULL);
	364	assert(is->encoding == INTSET_ENC_INT16);
	365	is = intsetAdd(is,-4294967295,NULL);
	366	assert(is->encoding == INTSET_ENC_INT64);
	367	assert(intsetFind(is,32));
	368	assert(intsetFind(is,-4294967295));
	369	checkConsistency(is);
	370	ok();
	371	}
	372
	373	printf("Upgrade from int32 to int64: "); {
	374	is = intsetNew();
	375	is = intsetAdd(is,65535,NULL);
	376	assert(is->encoding == INTSET_ENC_INT32);
	377	is = intsetAdd(is,4294967295,NULL);
	378	assert(is->encoding == INTSET_ENC_INT64);
	379	assert(intsetFind(is,65535));
	380	assert(intsetFind(is,4294967295));
	381	checkConsistency(is);
	382
	383	is = intsetNew();
	384	is = intsetAdd(is,65535,NULL);
	385	assert(is->encoding == INTSET_ENC_INT32);
	386	is = intsetAdd(is,-4294967295,NULL);
	387	assert(is->encoding == INTSET_ENC_INT64);
	388	assert(intsetFind(is,65535));
	389	assert(intsetFind(is,-4294967295));
	390	checkConsistency(is);
	391	ok();
	392	}
	393
	394	printf("Stress lookups: "); {
	395	long num = 100000, size = 10000;
	396	int i, bits = 20;
	397	long long start;
	398	is = createSet(bits,size);
	399	checkConsistency(is);
	400
	401	start = usec();
	402	for (i = 0; i < num; i++) intsetSearch(is,rand() % ((1<<bits)-1),NULL);
	403	printf("%ld lookups, %ld element set, %lldusec\n",num,size,usec()-start);
	404	}
	405
	406	printf("Stress add+delete: "); {
	407	int i, v1, v2;
	408	is = intsetNew();
	409	for (i = 0; i < 0xffff; i++) {
	410	v1 = rand() % 0xfff;
	411	is = intsetAdd(is,v1,NULL);
	412	assert(intsetFind(is,v1));
	413
	414	v2 = rand() % 0xfff;
	415	is = intsetRemove(is,v2,NULL);
	416	assert(!intsetFind(is,v2));
	417	}
	418	checkConsistency(is);
	419	ok();
	420	}
	421	}
	422	#endif