for  gcc/ChangeLog
from  Alexandre Oliva  <aoliva@redhat.com>

	* ddg.c (build_intra_loop_deps): Discard deps of nondebug on debug.

Index: gcc/ddg.c
===================================================================
--- gcc/ddg.c.orig	2011-05-04 03:42:20.938013725 -0300
+++ gcc/ddg.c	2011-05-04 03:42:30.202253457 -0300
@@ -452,7 +452,12 @@ build_intra_loop_deps (ddg_ptr g)
 
       FOR_EACH_DEP (dest_node->insn, SD_LIST_BACK, sd_it, dep)
 	{
-	  ddg_node_ptr src_node = get_node_of_insn (g, DEP_PRO (dep));
+	  ddg_node_ptr src_node;
+
+	  if (DEBUG_INSN_P (DEP_PRO (dep)) && !DEBUG_INSN_P (dest_node->insn))
+	    continue;
+
+	  src_node = get_node_of_insn (g, DEP_PRO (dep));
 
 	  if (!src_node)
 	    continue;