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[qfcc] Do a dags pre-pass to give operands leafs

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The reason double-alias fails is when the double assignment occurs, the
int operands don't yet have leaf nodes and thus the nodes cannot be
killed. This doesn't fix the bug.
This commit is contained in:
Bill Currie 2020-04-01 16:03:12 +09:00
parent 842125faf8
commit 4c79c9ffaf
1 changed files with 22 additions and 1 deletions
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23
tools/qfcc/source/dags.c
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@ -245,7 +245,21 @@ dag_node (operand_t *op)
}
static void
dag_make_children (dag_t *dag, statement_t *s, operand_t *operands[4],
dag_make_leafs (dag_t *dag, statement_t *s, operand_t *operands[FLOW_OPERANDS])
{
int i;
flow_analyze_statement (s, 0, 0, 0, operands);
for (i = 1; i < FLOW_OPERANDS; i++) {
if (!dag_node (operands[i])) {
leaf_node (dag, operands[i], s->expr);
}
}
}
static void
dag_make_children (dag_t *dag, statement_t *s,
operand_t *operands[FLOW_OPERANDS],
dagnode_t *children[3])
{
int i;
@ -730,6 +744,13 @@ dag_create (flownode_t *flownode)
dag->labels = alloca (num_lables * sizeof (daglabel_t));
dag->roots = set_new ();
// do a first pass to ensure all operands have an "x_0" leaf node
// prior do actual dag creation
for (s = block->statements; s; s = s->next) {
operand_t *operands[FLOW_OPERANDS];
dag_make_leafs (dag, s, operands);
}
// actual dag creation
for (s = block->statements; s; s = s->next) {
operand_t *operands[FLOW_OPERANDS];
dagnode_t *n = 0, *children[3] = {0, 0, 0};