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Create dependency edges.

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A node that writes to a var must be evaluated after any node that reads
that var, so for any node reading var, add that node to the edges of the
node currently associated with the var (unless the node is a child of the
node reading the var).
This commit is contained in:
Bill Currie 2012-11-18 12:56:27 +09:00
parent 8fe71f2146
commit 1452dcca9a
1 changed files with 18 additions and 7 deletions
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25
tools/qfcc/source/dags.c
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@ -267,8 +267,12 @@ dagnode_attach_label (dagnode_t *n, daglabel_t *l)
if (!op_is_identifer (l->op))
internal_error (0, "attempt to attach non-identifer label to dagnode "
"identifers");
if (l->dagnode)
set_remove (l->dagnode->identifiers, l->number);
if (l->dagnode) {
dagnode_t *node = l->dagnode;
set_union (n->edges, node->parents);
set_remove (n->edges, n->number);
set_remove (node->identifiers, l->number);
}
l->dagnode = n;
set_add (n->identifiers, l->number);
}
@ -378,11 +382,18 @@ dag_create (flownode_t *flownode)
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);
dagnode_t *child = children[i];
n->children[i] = child;
if (child) {
if (child->label->op) {
dagnode_t *node = child->label->dagnode;
if (node != child && node != n)
set_add (node->edges, n->number);
}
set_remove (dag->roots, child->number);
if (n != child)
set_add (n->edges, child->number);
set_add (child->parents, n->number);
n->types[i] = operands[i + 1]->type;
}
}