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split/merge (#9)

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Reviewed-on: #9
Co-authored-by: Greg Burd <greg@burd.me>
Co-committed-by: Greg Burd <greg@burd.me>
This commit is contained in:
Gregory Burd 2024-05-15 17:57:40 +00:00 committed by Gregory Burd
parent f5b500087d
commit b028408150
2 changed files with 160 additions and 200 deletions
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282
src/sparsemap.c
View file

@ -264,15 +264,15 @@ __sm_chunk_increase_capacity(__sm_chunk_t *chunk, size_t capacity)
size_t increased = 0;
register uint8_t *p = (uint8_t *)chunk->m_data;
for (size_t i = 0; i < sizeof(sm_bitvec_t); i++) {
for (size_t i = 0; i < sizeof(sm_bitvec_t); i++, p++) {
if (!*p || *p == 0xff) {
continue;
}
for (int j = 0; j < SM_FLAGS_PER_INDEX_BYTE; j++) {
size_t flags = SM_CHUNK_GET_FLAGS(*p, j);
if (flags == SM_PAYLOAD_NONE) {
p[i] &= ~((sm_bitvec_t)SM_PAYLOAD_ONES << (j * 2));
p[i] |= ((sm_bitvec_t)SM_PAYLOAD_ZEROS << (j * 2));
*p &= ~((sm_bitvec_t)SM_PAYLOAD_ONES << (j * 2));
*p |= ((sm_bitvec_t)SM_PAYLOAD_ZEROS << (j * 2));
increased += SM_BITS_PER_VECTOR;
if (increased + initial_capacity == capacity) {
__sm_assert(__sm_chunk_get_capacity(chunk) == capacity);
@ -871,10 +871,10 @@ __sm_get_chunk_aligned_offset(size_t idx)
*
* @param[in] map The sparsemap_t in question.
* @param[in] idx The index of the chunk to locate.
* @returns the byte offset of a __sm_chunk_t in m_data, or -1 there
* @returns the byte offset of a __sm_chunk_t in m_data, or -1 if there
* are no chunks.
*/
static size_t
static ssize_t
__sm_get_chunk_offset(sparsemap_t *map, sparsemap_idx_t idx)
{
size_t count = __sm_get_chunk_count(map);
@ -960,34 +960,25 @@ __sm_remove_data(sparsemap_t *map, size_t offset, size_t gap_size)
/** @brief Merges into the chunk at \b offset all set bits from \b src.
*
* @param[in] chunk The chunk in question.
* @param[in] map The map the chunk belongs too.
* @param[in] offset The offset of the first bit in the chunk to be merged.
* @todo merge vectors rather than call sparsemap_set() in a loop
* @todo merge at the vector level not offset
*/
void
__sm_merge_chunk(sparsemap_t *chunk, sparsemap_idx_t offset, __sm_chunk_t src)
{
size_t capacity = __sm_chunk_get_capacity(&src);
for (sparsemap_idx_t j = 0; j < capacity; j++, offset++) {
if (__sm_chunk_is_set(&src, j)) {
sparsemap_set(chunk, offset, true);
}
}
}
#if 0
void
__sm_merge_chunk(sparsemap_t *map, sparsemap_idx_t idx, sparsemap_idx_t capacity, __sm_chunk_t *dst_chunk, __sm_chunk_t *src_chunk)
__sm_merge_chunk(sparsemap_t *map, sparsemap_idx_t src_start, sparsemap_idx_t dst_start, sparsemap_idx_t capacity, __sm_chunk_t *dst_chunk,
__sm_chunk_t *src_chunk)
{
ssize_t delta = src_start - dst_start;
for (sparsemap_idx_t j = 0; j < capacity; j++) {
sparsemap_idx_t offset = __sm_get_chunk_offset(map, idx + j);
if (__sm_chunk_is_set(src_chunk, j) && !__sm_chunk_is_set(dst_chunk, j)) {
ssize_t offset = __sm_get_chunk_offset(map, src_start + j);
if (__sm_chunk_is_set(src_chunk, j) && !__sm_chunk_is_set(dst_chunk, j + delta)) {
size_t position;
sm_bitvec_t fill;
switch (__sm_chunk_set(dst_chunk, j, true, &position, &fill, false)) {
switch (__sm_chunk_set(dst_chunk, j + delta, true, &position, &fill, false)) {
case SM_NEEDS_TO_GROW:
offset += sizeof(sm_idx_t) + position * sizeof(sm_bitvec_t);
__sm_insert_data(map, offset, (uint8_t *)&fill, sizeof(sm_bitvec_t));
__sm_chunk_set(dst_chunk, j, true, &position, &fill, true);
__sm_chunk_set(dst_chunk, j + delta, true, &position, &fill, true);
break;
case SM_NEEDS_TO_SHRINK:
if (__sm_chunk_is_empty(src_chunk)) {
@ -999,11 +990,13 @@ __sm_merge_chunk(sparsemap_t *map, sparsemap_idx_t idx, sparsemap_idx_t capacity
__sm_remove_data(map, offset, sizeof(sm_bitvec_t));
}
break;
case SM_OK:
default:
break;
}
}
}
}
#endif
/*
* The following is the "Sparsemap" implementation, it uses chunks (code above)
@ -1190,7 +1183,7 @@ sparsemap_set(sparsemap_t *map, sparsemap_idx_t idx, bool value)
__sm_append_data(map, &buf[0], sizeof(buf));
uint8_t *p = __sm_get_chunk_data(map, 0);
*(sm_idx_t *)p = __sm_get_chunk_aligned_offset(idx); // TODO: vector aligned?
*(sm_idx_t *)p = __sm_get_vector_aligned_offset(idx); // TODO: vector or chunk aligned?
__sm_set_chunk_count(map, 1);
@ -1216,7 +1209,7 @@ sparsemap_set(sparsemap_t *map, sparsemap_idx_t idx, bool value)
uint8_t buf[sizeof(sm_idx_t) + sizeof(sm_bitvec_t) * 2] = { 0 };
__sm_insert_data(map, offset, &buf[0], sizeof(buf));
size_t aligned_idx = __sm_get_chunk_aligned_offset(idx);
size_t aligned_idx = __sm_get_chunk_aligned_offset(idx); // TODO: vector or chunk alignment?
if (start - aligned_idx < SM_CHUNK_MAX_CAPACITY) {
__sm_chunk_t chunk;
__sm_chunk_init(&chunk, p + sizeof(sm_idx_t));
@ -1411,35 +1404,6 @@ size_t
sparsemap_count(sparsemap_t *map)
{
return sparsemap_rank(map, 0, SPARSEMAP_IDX_MAX, true);
#if 0
size_t c = 0, count = __sm_get_chunk_count(map);
if (count == 0) {
return 0;
}
uint8_t *p = __sm_get_chunk_data(map, 0);
for (size_t i = 0; i < count; i++) {
p += sizeof(sm_idx_t);
__sm_chunk_t chunk;
__sm_chunk_init(&chunk, p);
for (size_t m = 0; m < sizeof(sm_bitvec_t); m++, p++) {
for (int n = 0; n < SM_FLAGS_PER_INDEX_BYTE; n++) {
size_t flags = SM_CHUNK_GET_FLAGS(*p, n);
if (flags == SM_PAYLOAD_NONE) {
continue;
} else if (flags == SM_PAYLOAD_ZEROS) {
continue;
} else if (flags == SM_PAYLOAD_ONES) {
c += SM_BITS_PER_VECTOR;
} else if (flags == SM_PAYLOAD_MIXED) {
sm_bitvec_t w = chunk.m_data[1 + __sm_chunk_get_position(&chunk, m * SM_FLAGS_PER_INDEX_BYTE + n)];
c += popcountll(w);
}
}
}
}
return c;
#endif
}
void
@ -1462,81 +1426,17 @@ sparsemap_scan(sparsemap_t *map, void (*scanner)(sm_idx_t[], size_t, void *aux),
}
}
int
sparsemap_merge(sparsemap_t *map, sparsemap_t *other)
{
uint8_t *src, *dst;
size_t src_count = __sm_get_chunk_count(other);
size_t dst_count = __sm_get_chunk_count(map);
size_t max_chunk_count = src_count + dst_count;
ssize_t difference = map->m_capacity - (other->m_data_used + src_count * (sizeof(sm_idx_t) + sizeof(sm_bitvec_t) * 2));
/* Estimate worst-case overhead required for merge. */
if (difference <= 0) {
errno = ENOSPC;
return -difference;
}
dst = __sm_get_chunk_data(map, 0);
src = __sm_get_chunk_data(other, 0);
for (size_t i = 0; i < max_chunk_count && src_count; i++) {
sm_idx_t src_start = *(sm_idx_t *)src;
sm_idx_t dst_start = *(sm_idx_t *)dst;
src_start = __sm_get_chunk_aligned_offset(src_start);
dst_start = __sm_get_chunk_aligned_offset(dst_start);
if (src_start > dst_start && dst_count > 0) {
__sm_chunk_t dst_chunk;
__sm_chunk_init(&dst_chunk, dst + sizeof(sm_idx_t));
dst += sizeof(sm_idx_t) + __sm_chunk_get_size(&dst_chunk);
dst_count--;
continue;
}
if (src_start == dst_start && dst_count > 0) {
/* Chunks overlap, merge them. */
__sm_chunk_t src_chunk;
__sm_chunk_init(&src_chunk, src + sizeof(sm_idx_t));
__sm_chunk_t dst_chunk;
__sm_chunk_init(&dst_chunk, dst + sizeof(sm_idx_t));
__sm_merge_chunk(map, src_start, src_chunk);
*(sm_idx_t *)dst = __sm_get_chunk_aligned_offset(src_start);
src += sizeof(sm_idx_t) + __sm_chunk_get_size(&src_chunk);
dst += sizeof(sm_idx_t) + __sm_chunk_get_size(&dst_chunk);
dst_count--;
src_count--;
continue;
}
if (src_start < dst_start || dst_count == 0) {
__sm_chunk_t src_chunk;
__sm_chunk_init(&src_chunk, src + sizeof(sm_idx_t));
size_t src_size = __sm_chunk_get_size(&src_chunk);
if (dst_count == 0) {
__sm_append_data(map, src, sizeof(sm_idx_t) + src_size);
} else {
size_t offset = __sm_get_chunk_offset(map, dst_start);
__sm_insert_data(map, offset, src, sizeof(sm_idx_t) + src_size);
}
/* Update the chunk count and data_used. */
__sm_set_chunk_count(map, __sm_get_chunk_count(map) + 1);
/* Carry on to the next chunk. */
__sm_chunk_t dst_chunk;
__sm_chunk_init(&dst_chunk, dst + sizeof(sm_idx_t));
src += sizeof(sm_idx_t) + __sm_chunk_get_size(&src_chunk);
dst += sizeof(sm_idx_t) + __sm_chunk_get_size(&dst_chunk);
src_count--;
}
}
return 0;
}
#if 0
int
sparsemap_merge(sparsemap_t *destination, sparsemap_t *source)
{
uint8_t *src, *dst;
size_t src_count = __sm_get_chunk_count(source);
size_t dst_count = __sm_get_chunk_count(destination);
size_t max_chunk_count = src_count + dst_count;
sparsemap_idx_t dst_ending_offset = sparsemap_get_ending_offset(destination);
if (src_count == 0) {
return 0;
}
ssize_t remaining_capacity = destination->m_capacity - destination->m_data_used -
(source->m_data_used + src_count * (sizeof(sm_idx_t) + sizeof(sm_bitvec_t) * 2));
@ -1547,70 +1447,115 @@ sparsemap_merge(sparsemap_t *destination, sparsemap_t *source)
}
src = __sm_get_chunk_data(source, 0);
dst = __sm_get_chunk_data(destination, 0);
for (size_t i = 0; i < max_chunk_count && src_count; i++) {
while (src_count) {
sm_idx_t src_start = *(sm_idx_t *)src;
sm_idx_t dst_start = *(sm_idx_t *)dst;
src_start = __sm_get_chunk_aligned_offset(src_start);
dst_start = __sm_get_chunk_aligned_offset(dst_start);
if (src_start > dst_start && dst_count > 0) {
__sm_chunk_t dst_chunk;
__sm_chunk_init(&dst_chunk, dst + sizeof(sm_idx_t));
dst += sizeof(sm_idx_t) + __sm_chunk_get_size(&dst_chunk);
dst_count--;
continue;
}
if (src_start == dst_start && dst_count > 0) {
/* Chunks overlap, merge them. */
__sm_chunk_t src_chunk;
__sm_chunk_init(&src_chunk, src + sizeof(sm_idx_t));
__sm_chunk_t dst_chunk;
__sm_chunk_init(&dst_chunk, dst + sizeof(sm_idx_t));
size_t src_capacity = __sm_chunk_get_capacity(&src_chunk);
ssize_t dst_offset = __sm_get_chunk_offset(destination, src_start);
if (dst_offset >= 0) {
dst = __sm_get_chunk_data(destination, dst_offset);
sm_idx_t dst_start = *(sm_idx_t *)dst;
__sm_chunk_t dst_chunk;
__sm_chunk_init(&dst_chunk, dst + sizeof(sm_idx_t));
size_t dst_capacity = __sm_chunk_get_capacity(&dst_chunk);
if (dst_capacity < src_capacity) {
/* Try to expand the capacity if there's room before the start of the next chunk. */
if (src_start == dst_start && dst_capacity < src_capacity) {
ssize_t nxt_offset = __sm_get_chunk_offset(destination, dst_start + dst_capacity + 1);
uint8_t *nxt_dst = __sm_get_chunk_data(destination, nxt_offset);
sm_idx_t nxt_dst_start = *(sm_idx_t *)nxt_dst;
if (nxt_dst_start > dst_start + src_capacity) {
__sm_chunk_increase_capacity(&dst_chunk, src_capacity);
dst_capacity = __sm_chunk_get_capacity(&dst_chunk);
}
if (*(sm_idx_t *)dst > *(sm_idx_t *)src) {
*(sm_idx_t *)dst = *(sm_idx_t *)src;
}
__sm_merge_chunk(destination, src_start, src_capacity, &dst_chunk, &src_chunk);
src += sizeof(sm_idx_t) + __sm_chunk_get_size(&src_chunk);
dst += sizeof(sm_idx_t) + __sm_chunk_get_size(&dst_chunk);
dst_count--;
/* Source chunk precedes next destination chunk. */
if ((src_start + src_capacity) <= dst_start) {
size_t src_size = __sm_chunk_get_size(&src_chunk);
ssize_t offset = __sm_get_chunk_offset(destination, dst_start);
__sm_insert_data(destination, offset, src, sizeof(sm_idx_t) + src_size);
/* Update the chunk count and data_used. */
__sm_set_chunk_count(destination, __sm_get_chunk_count(destination) + 1);
src_count--;
src += sizeof(sm_idx_t) + __sm_chunk_get_size(&src_chunk);
continue;
}
if (src_start < dst_start || dst_count == 0) {
__sm_chunk_t src_chunk;
__sm_chunk_init(&src_chunk, src + sizeof(sm_idx_t));
/* Source chunk follows next destination chunk. */
if (src_start >= (dst_start + dst_capacity)) {
size_t src_size = __sm_chunk_get_size(&src_chunk);
if (dst_count == 0) {
if (dst_offset == __sm_get_chunk_offset(destination, SPARSEMAP_IDX_MAX)) {
__sm_append_data(destination, src, sizeof(sm_idx_t) + src_size);
} else {
size_t offset = __sm_get_chunk_offset(destination, dst_start);
ssize_t offset = __sm_get_chunk_offset(destination, src_start);
__sm_insert_data(destination, offset, src, sizeof(sm_idx_t) + src_size);
}
/* Update the chunk count and data_used. */
__sm_set_chunk_count(destination, __sm_get_chunk_count(destination) + 1);
src_count--;
src += sizeof(sm_idx_t) + __sm_chunk_get_size(&src_chunk);
continue;
}
/* Source and destination and a perfect overlapping pair. */
if (src_start == dst_start && src_capacity == dst_capacity) {
__sm_merge_chunk(destination, src_start, dst_start, dst_capacity, &dst_chunk, &src_chunk);
src_count--;
src += sizeof(sm_idx_t) + __sm_chunk_get_size(&src_chunk);
continue;
}
/* Non-uniform overlapping chunks. */
if (dst_start < src_start || (dst_start == src_start && dst_capacity != src_capacity)) {
size_t src_end = src_start + src_capacity;
size_t dst_end = dst_start + dst_capacity;
size_t overlap = src_end > dst_end ? src_capacity - (src_end - dst_end) : src_capacity;
__sm_merge_chunk(destination, src_start, dst_start, overlap, &dst_chunk, &src_chunk);
for (size_t n = src_start + overlap; n <= src_end; n++) {
if (sparsemap_is_set(source, n)) {
sparsemap_set(destination, n, true);
}
}
src_count--;
src += sizeof(sm_idx_t) + __sm_chunk_get_size(&src_chunk);
continue;
}
} else {
if (src_start >= dst_ending_offset) {
/* Starting offset is after destination chunks, so append data. */
size_t src_size = __sm_chunk_get_size(&src_chunk);
__sm_append_data(destination, src, sizeof(sm_idx_t) + src_size);
/* Update the chunk count and data_used. */
__sm_set_chunk_count(destination, __sm_get_chunk_count(destination) + 1);
/* Carry on to the next chunk. */
__sm_chunk_t dst_chunk;
__sm_chunk_init(&dst_chunk, dst + sizeof(sm_idx_t));
src += sizeof(sm_idx_t) + __sm_chunk_get_size(&src_chunk);
dst += sizeof(sm_idx_t) + __sm_chunk_get_size(&dst_chunk);
src_count--;
src += sizeof(sm_idx_t) + __sm_chunk_get_size(&src_chunk);
continue;
} else {
/* Source chunk precedes next destination chunk. */
size_t src_size = __sm_chunk_get_size(&src_chunk);
ssize_t offset = __sm_get_chunk_offset(destination, src_start);
__sm_insert_data(destination, offset, src, sizeof(sm_idx_t) + src_size);
/* Update the chunk count and data_used. */
__sm_set_chunk_count(destination, __sm_get_chunk_count(destination) + 1);
src_count--;
src += sizeof(sm_idx_t) + __sm_chunk_get_size(&src_chunk);
continue;
}
}
}
return 0;
}
#endif
sparsemap_idx_t
sparsemap_split(sparsemap_t *map, sparsemap_idx_t offset, sparsemap_t *other)
{
if (!(offset == SPARSEMAP_IDX_MAX) && (offset < 0 || offset >= sparsemap_get_ending_offset(map))) {
if (!(offset == SPARSEMAP_IDX_MAX) && offset >= sparsemap_get_ending_offset(map)) {
return 0;
}
@ -1677,6 +1622,7 @@ sparsemap_split(sparsemap_t *map, sparsemap_idx_t offset, sparsemap_t *other)
other->m_data_used += sizeof(sm_idx_t) + sizeof(sm_bitvec_t);
}
sm_idx_t start = *(sm_idx_t *)src;
src += sizeof(sm_idx_t);
__sm_chunk_t s_chunk;
__sm_chunk_init(&s_chunk, src);
@ -1687,13 +1633,14 @@ sparsemap_split(sparsemap_t *map, sparsemap_idx_t offset, sparsemap_t *other)
__sm_chunk_reduce_capacity(&d_chunk, __sm_get_vector_aligned_offset(capacity - (offset % capacity)));
/* Now copy the bits. */
sparsemap_idx_t d = offset;
sparsemap_idx_t b = __sm_get_vector_aligned_offset(offset % capacity);
for (size_t j = offset % capacity; j < capacity; j++, d++) {
if (__sm_chunk_is_set(&s_chunk, j)) {
assert(sparsemap_set(other, d, true) == d);
if (j > b && (j - b) % capacity < SM_BITS_PER_VECTOR) {
sparsemap_set(map, d, false);
for (size_t j = start; j < capacity + start; j++) {
if (j >= offset) {
if (__sm_chunk_is_set(&s_chunk, j - start)) {
sparsemap_set(other, j, true);
if (j >= b && (j - b) % capacity < SM_BITS_PER_VECTOR) {
sparsemap_set(map, j, false);
}
}
}
}
@ -1704,7 +1651,8 @@ sparsemap_split(sparsemap_t *map, sparsemap_idx_t offset, sparsemap_t *other)
i++;
/* Reduce the capacity of the source-chunk effectively erases bits. */
__sm_chunk_reduce_capacity(&s_chunk, b + SM_BITS_PER_VECTOR);
size_t r = __sm_get_vector_aligned_offset(((offset - start) % capacity) + SM_BITS_PER_VECTOR);
__sm_chunk_reduce_capacity(&s_chunk, r);
}
/* Now continue with all remaining chunks. */

52
tests/test.c
View file

@ -543,6 +543,9 @@ test_api_get_data(const MunitParameter params[], void *data)
assert_true(sparsemap_get_data(map) == buf);
munit_free(buf);
munit_free(map);
return MUNIT_OK;
}
@ -733,15 +736,15 @@ test_api_split(const MunitParameter params[], void *data)
sparsemap_split(map, seg + off, &portion);
for (sparsemap_idx_t i = 0; i < off; i++) {
assert_true(sparsemap_is_set(map, i + seg));
assert_false(sparsemap_is_set(&portion, i + seg));
for (sparsemap_idx_t i = seg; i < seg + 1024; i++) {
if (i < seg + off) {
assert_true(sparsemap_is_set(map, i));
assert_false(sparsemap_is_set(&portion, i));
} else {
assert_false(sparsemap_is_set(map, i));
assert_true(sparsemap_is_set(&portion, i));
}
for (sparsemap_idx_t i = off + 1; i < 1024; i++) {
assert_false(sparsemap_is_set(map, i + seg));
assert_true(sparsemap_is_set(&portion, i + seg));
}
sparsemap_clear(map);
sparsemap_clear(&portion);
}
@ -820,10 +823,8 @@ test_api_merge(const MunitParameter params[], void *data)
// Merge a single set bit in the first chunk into the empty map.
sparsemap_set(other, 0, true);
sparsemap_merge(map, other);
assert_true(sparsemap_is_set(other, 0));
assert_true(sparsemap_is_set(map, 0));
sparsemap_clear(map);
sparsemap_clear(other);
@ -831,49 +832,42 @@ test_api_merge(const MunitParameter params[], void *data)
sparsemap_set(map, 0, true);
sparsemap_set(other, 0, true);
sparsemap_merge(map, other);
assert_true(sparsemap_is_set(map, 0));
sparsemap_clear(map);
sparsemap_clear(other);
// Merge an empty map with one that has the first bit set.
sparsemap_set(map, 0, true);
sparsemap_merge(map, other);
assert_true(sparsemap_is_set(map, 0));
sparsemap_clear(map);
sparsemap_clear(other);
sparsemap_set(other, 2049, true);
sparsemap_merge(map, other);
assert_true(sparsemap_is_set(map, 2049));
sparsemap_clear(map);
sparsemap_clear(other);
sparsemap_set(other, 1, true);
sparsemap_set(other, 2049, true);
sparsemap_set(map, 2050, true);
sparsemap_set(other, 4097, true);
sparsemap_set(map, 6113, true);
sparsemap_set(other, 8193, true);
sparsemap_merge(map, other);
assert_true(sparsemap_is_set(map, 1));
assert_true(sparsemap_is_set(map, 2049));
assert_true(sparsemap_is_set(map, 2050));
assert_true(sparsemap_is_set(map, 4097));
assert_true(sparsemap_is_set(map, 6113));
assert_true(sparsemap_is_set(map, 8193));
for (int i = 0; i < 10000; i++) {
if (i == 2049 || i == 1 || i == 2050 || i == 4097 || i == 6113 || i == 8193)
continue;
else
assert_false(sparsemap_is_set(map, i));
}
sparsemap_clear(map);
sparsemap_clear(other);
@ -883,15 +877,33 @@ test_api_merge(const MunitParameter params[], void *data)
for (int i = 2049; i < 4096; i++) {
sparsemap_set(other, i, true);
}
sparsemap_merge(map, other);
assert(sparsemap_is_set(map, 0));
assert(sparsemap_is_set(map, 2048));
assert(sparsemap_is_set(map, 8193));
for (int i = 2049; i < 4096; i++) {
assert(sparsemap_is_set(map, i));
}
sparsemap_clear(map);
sparsemap_clear(other);
for (int i = 2049; i < 4096; i++) {
sparsemap_set(map, i, true);
}
sparsemap_split(map, 2051, other);
for (int i = 2049; i < 4096; i++) {
if (i < 2051) {
assert_true(sparsemap_is_set(map, i));
assert_false(sparsemap_is_set(other, i));
} else {
assert_false(sparsemap_is_set(map, i));
assert_true(sparsemap_is_set(other, i));
}
}
sparsemap_merge(map, other);
for (int i = 2049; i < 4096; i++) {
sparsemap_is_set(map, i);
}
munit_free(other);
return MUNIT_OK;