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Treat newly created nodes as root nodes. 

When a node is made a child of another node, it is removed from the dag's
set of root nodes.
This commit is contained in:
Bill Currie 2012-11-18 10:50:10 +09:00
parent af4e56bba8
commit d58595660f
1 changed files with 9 additions and 7 deletions
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16
tools/qfcc/source/dags.c
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@ -332,7 +332,6 @@ dag_create (flownode_t *flownode)
dagnode_t **nodes;
daglabel_t **labels;
int num_statements = 0;
int i;
flush_daglabels ();
@ -345,6 +344,7 @@ dag_create (flownode_t *flownode)
dag->nodes = alloca (num_statements * 4 * sizeof (dagnode_t));
// at most 3 per statement
dag->labels = alloca (num_statements * 3 * sizeof (daglabel_t));
dag->roots = set_new ();
for (s = block->statements; s; s = s->next) {
operand_t *operands[4];
@ -354,8 +354,11 @@ dag_create (flownode_t *flownode)
flow_analyze_statement (s, 0, 0, 0, operands);
for (i = 0; i < 3; i++) {
if (!(children[i] = node (operands[i + 1])))
if (!(children[i] = node (operands[i + 1]))) {
children[i] = leaf_node (dag, operands[i + 1], s->expr);
if (children[i])
set_add (dag->roots, children[i]->number);
}
}
op = opcode_label (dag, s->opcode, s->expr);
if (s->type == st_assign) {
@ -373,9 +376,11 @@ dag_create (flownode_t *flownode)
n = new_node (dag);
n->type = s->type;
n->label = op;
set_add (dag->roots, n->number);
for (i = 0; i < 3; i++) {
n->children[i] = children[i];
if (n->children[i]) {
set_remove (dag->roots, children[i]->number);
set_add (n->edges, n->children[i]->number);
set_add (n->children[i]->parents, n->number);
n->types[i] = operands[i + 1]->type;
@ -388,17 +393,14 @@ dag_create (flownode_t *flownode)
dagnode_attach_label (n, lx);
}
}
nodes = malloc (dag->num_nodes * sizeof (dagnode_t *));
memcpy (nodes, dag->nodes, dag->num_nodes * sizeof (dagnode_t *));
dag->nodes = nodes;
labels = malloc (dag->num_labels * sizeof (daglabel_t *));
memcpy (labels, dag->labels, dag->num_labels * sizeof (daglabel_t *));
dag->labels = labels;
dag->roots = set_new ();
for (i = 0; i < dag->num_nodes; i++) {
if (set_is_empty (dag->nodes[i]->parents))
set_add (dag->roots, dag->nodes[i]->number);
}
dag_remove_dead_vars (dag);
dag_sort_nodes (dag);
return dag;