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using less space to store the used_edges and critical_nodes arrays

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fc_botelho
2005-01-03 20:47:21 +00:00
parent b3f008eb40
commit 77ce0aaddf
2 changed files with 37 additions and 25 deletions
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26
src/bmz.c
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@@ -16,10 +16,16 @@
static uint32 UNDEFINED = UINT_MAX;
static const char bitmask[8] = { 1, 1 << 1, 1 << 2, 1 << 3, 1 << 4, 1 << 5, 1 << 6, 1 << 7 };
#define GETBIT(array, i) (array[(i) / 8] & bitmask[(i) % 8])
#define SETBIT(array, i) (array[(i) / 8] |= bitmask[(i) % 8])
#define UNSETBIT(array, i) (array[(i) / 8] &= (~(bitmask[(i) % 8])))
static int bmz_gen_edges(mph_t *mph);
static void bmz_traverse_critical_nodes(bmz_mph_data_t *bmz, uint32 v, uint32 * biggest_g_value, uint32 * biggest_edge_value, uint8 * used_edges);
static void bmz_traverse_non_critical_nodes(bmz_mph_data_t *bmz, uint8 * used_edges);
mph_t *bmz_mph_new(key_source_t *key_source)
{
mph_t *mph = NULL;
@@ -70,7 +76,6 @@ mphf_t *bmz_mph_create(mph_t *mph, float bmz_c)
uint32 i;
uint32 iterations = 10;
uint8 *used_edges = NULL;
uint32 unused_edge_index = 0;
uint32 biggest_g_value = 0;
uint32 biggest_edge_value = 1;
DEBUGP("bmz_c: %f\n", bmz_c);
@@ -131,12 +136,13 @@ mphf_t *bmz_mph_create(mph_t *mph, float bmz_c)
// Searching step
if (mph->verbosity)
{
fprintf(stderr, "Starting Searching step\n");
fprintf(stderr, "Starting Searching step.\n");
fprintf(stderr, "\tTraversing critical vertices.\n");
}
DEBUGP("Searching step\n");
used_edges = (uint8 *)malloc(bmz->m*sizeof(uint8));
memset(used_edges, 0, bmz->m);
used_edges = (uint8 *)malloc((bmz->m*sizeof(uint8))/8 + 1);
memset(used_edges, 0, bmz->m/8 + 1);
free(bmz->g);
bmz->g = malloc(bmz->n * sizeof(uint32));
assert(bmz->g);
@@ -211,7 +217,7 @@ static void bmz_traverse_critical_nodes(bmz_mph_data_t *bmz, uint32 v, uint32 *
if (graph_node_is_critical(bmz->graph, lav) && (bmz->g[lav] != UNDEFINED))
{
assert(next_g + bmz->g[lav] < bmz->m);
if (used_edges[next_g + bmz->g[lav]])
if (GETBIT(used_edges, next_g + bmz->g[lav]))
{
collision = 1;
break;
@@ -226,7 +232,7 @@ static void bmz_traverse_critical_nodes(bmz_mph_data_t *bmz, uint32 v, uint32 *
{
if (graph_node_is_critical(bmz->graph, lav) && (bmz->g[lav] != UNDEFINED))
{
used_edges[next_g + bmz->g[lav]] = 1;
SETBIT(used_edges,next_g + bmz->g[lav]);
if(next_g + bmz->g[lav] > *biggest_edge_value) *biggest_edge_value = next_g + bmz->g[lav];
}
}
@@ -245,7 +251,7 @@ static uint32 next_unused_edge(bmz_mph_data_t *bmz, uint8 * used_edges, uint32 u
while(1)
{
assert(unused_edge_index < bmz->m);
if(used_edges[unused_edge_index]) unused_edge_index ++;
if(GETBIT(used_edges, unused_edge_index)) unused_edge_index ++;
else break;
}
return unused_edge_index;
@@ -259,16 +265,18 @@ static void bmz_traverse(bmz_mph_data_t *bmz, uint8 * used_edges, uint32 v, uint
{
DEBUGP("Visiting neighbor %u\n", neighbor);
if(bmz->g[neighbor] != UNDEFINED) continue;
*unused_edge_index = next_unused_edge(bmz, used_edges, *unused_edge_index + 1);
*unused_edge_index = next_unused_edge(bmz, used_edges, *unused_edge_index);
bmz->g[neighbor] = *unused_edge_index - bmz->g[v];
(*unused_edge_index)++;
bmz_traverse(bmz, used_edges, neighbor, unused_edge_index);
}
}
static void bmz_traverse_non_critical_nodes(bmz_mph_data_t *bmz, uint8 * used_edges)
{
uint32 i, v1, v2, unused_edge_index = -1;
uint32 i, v1, v2, unused_edge_index = 0;
DEBUGP("Labelling non critical vertices\n");
for(i = 0; i < bmz->m; i++)
{