From ffe042333422649088689f15e96d684d2e09d408 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Christian=20W=C3=BCrdig?=
 <chriswue@ipd.info.uni-karlsruhe.de>
Date: Tue, 6 Feb 2007 09:45:57 +0000
Subject: [PATCH] assert if someone tries to exchange a node with itself

[r8595]
---
 ir/ir/irgmod.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ir/ir/irgmod.c b/ir/ir/irgmod.c
index b60424081..7d55d7a32 100644
--- a/ir/ir/irgmod.c
+++ b/ir/ir/irgmod.c
@@ -54,6 +54,7 @@ turn_into_tuple (ir_node *node, int arity)
 void
 exchange (ir_node *old, ir_node *nw)
 {
+  assert(old != nw && "Exchanging node with itself is not allowed");
   hook_replace(old, nw);
 
   /*
-- 
2.20.1