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Use a dag-local live vars set.

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Function calls need to ensure .param_N actually get assigned, and so the
params must be seen as live by the dead variable removal code. However, it
is undesirable to modify the live vars data of the flow node, so make a
local copy.
This commit is contained in:
Bill Currie 2012-11-19 15:18:31 +09:00
parent d1252813ce
commit 68bf013601
1 changed files with 26 additions and 3 deletions
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29
tools/qfcc/source/dags.c
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@ -279,7 +279,7 @@ dagnode_attach_label (dagnode_t *n, daglabel_t *l)
}
static void
dag_remove_dead_vars (dag_t *dag)
dag_remove_dead_vars (dag_t *dag, set_t *live_vars)
{
int i;
@ -292,7 +292,7 @@ dag_remove_dead_vars (dag_t *dag)
var = flow_get_var (l->op);
if (!var)
continue;
if (!set_is_member (dag->flownode->live_vars.out, var->number))
if (!set_is_member (live_vars, var->number))
set_remove (l->dagnode->identifiers, l->number);
}
}
@ -337,12 +337,15 @@ dag_create (flownode_t *flownode)
dagnode_t **nodes;
daglabel_t **labels;
int num_statements = 0;
set_t *live_vars = set_new ();
flush_daglabels ();
for (s = block->statements; s; s = s->next)
num_statements++;
set_assign (live_vars, flownode->live_vars.out);
dag = new_dag ();
dag->flownode = flownode;
// at most 4 per statement
@ -404,6 +407,25 @@ dag_create (flownode_t *flownode)
lx->expr = s->expr;
dagnode_attach_label (n, lx);
}
if (n->type == st_func
&& (!strncmp (n->label->opcode, "<CALL", 5)
|| !strncmp (n->label->opcode, "<RCALL", 6))) {
int start, end;
if (!strncmp (n->label->opcode, "<CALL", 5)) {
start = 0;
end = 0;
if (n->label->opcode[5] != '>')
end = n->label->opcode[5] - '0';
} else {
start = 2;
end = n->label->opcode[6] - '0';
}
while (start < end) {
set_add (live_vars, start + 1);
start++;
}
}
}
nodes = malloc (dag->num_nodes * sizeof (dagnode_t *));
@ -413,8 +435,9 @@ dag_create (flownode_t *flownode)
memcpy (labels, dag->labels, dag->num_labels * sizeof (daglabel_t *));
dag->labels = labels;
dag_remove_dead_vars (dag);
dag_remove_dead_vars (dag, live_vars);
dag_sort_nodes (dag);
set_delete (live_vars);
return dag;
}