From 36b5e2c7b7ec3e12264f01fef6ecca8c5a01712a Mon Sep 17 00:00:00 2001
From: Michael Beck <beck@ipd.info.uni-karlsruhe.de>
Date: Mon, 12 Jun 2006 14:48:44 +0000
Subject: [PATCH] local_optimize_df(): when running the wait queue, check if a
 node is already dead before optimizing it ... This is needed due to the
 changes of the exchange() semantics, which now kills the old node in both
 (ir_edges enabled and not) modes.

[r7915]
---
 ir/ir/irgopt.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ir/ir/irgopt.c b/ir/ir/irgopt.c
index 53829b59f..0dbdff611 100644
--- a/ir/ir/irgopt.c
+++ b/ir/ir/irgopt.c
@@ -177,7 +177,8 @@ void optimize_graph_df(ir_graph *irg) {
   /* finish the wait queue */
   while (! pdeq_empty(waitq)) {
     ir_node *n = pdeq_getl(waitq);
-    opt_walker(n, waitq);
+    if (! is_Bad(n))
+      opt_walker(n, waitq);
   }
 
   del_pdeq(waitq);
-- 
2.20.1