BugFix: works again for RAW with non twos-complement

[libfirm] / ir / ir / irgopt.c

diff --git a/ir/ir/irgopt.c b/ir/ir/irgopt.c
index 207c922..ed97380 100644 (file)
--- a/ir/ir/irgopt.c
+++ b/ir/ir/irgopt.c
@@ -166,11 +166,11 @@ static void opt_walker(ir_node *n, void *env) {
 }
 
 /* Applies local optimizations to all nodes in the graph until fixpoint. */
-void optimize_graph_df(ir_graph *irg) {
+int optimize_graph_df(ir_graph *irg) {
        pdeq     *waitq = new_pdeq();
        ir_graph *rem = current_ir_graph;
        ir_node  *end;
-       int      i, state, n_ka;
+       int      i, state, n_ka, changed;
 
        current_ir_graph = irg;
 
@@ -220,6 +220,10 @@ void optimize_graph_df(ir_graph *irg) {
        set_irg_visited(current_ir_graph, get_irg_visited(irg) - 1);
        irg_walk(get_irg_end(irg), NULL, opt_walker, waitq);
 
+       /* any optimized nodes are stored in the wait queue,
+        * so if it's not empty, the graph has been changed */
+       changed = !pdeq_empty(waitq);
+
        /* finish the wait queue */
        while (! pdeq_empty(waitq)) {
                ir_node *n = pdeq_getl(waitq);
@@ -235,4 +239,5 @@ void optimize_graph_df(ir_graph *irg) {
                edges_deactivate(irg);
 
        current_ir_graph = rem;
+       return changed;
 }