From: Michael Beck <beck@ipd.info.uni-karlsruhe.de>
Date: Fri, 24 Mar 2006 10:17:45 +0000 (+0000)
Subject: remove propagation of Unknown. This causes problems in backends in in
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=c2de0a9d9eb3e3d6ed3ec7e9141570199b286a93;p=libfirm

remove propagation of Unknown. This causes problems in backends in in
Firm "hand" construction

[r7523]
---

diff --git a/ir/ir/iropt.c b/ir/ir/iropt.c
index bfef29efa..1d0d54a02 100644
--- a/ir/ir/iropt.c
+++ b/ir/ir/iropt.c
@@ -3500,8 +3500,15 @@ gigo (ir_node *node)
 
       if (is_Bad(pred))
         return new_Bad();
+#if 0
+      /* Propagating Unknowns here seems to be a bad idea, because
+         sometimes we need a node as a input and did not want that
+         it kills it's user.
+         However, i might be useful to move this into a later phase
+         (it you thing optimizing such code is useful). */
       if (is_Unknown(pred) && mode_is_data(get_irn_mode(node)))
         return new_Unknown(get_irn_mode(node));
+#endif
     }
   }
 #if 0