re PR debug/47283 (ICE in refs_may_alias_p_1, at tree-ssa-alias.c)

2011-03-03  Richard Guenther  <rguenther@suse.de>

	PR middle-end/47283
	* tree-ssa-alias.c (ptr_deref_may_alias_decl_p): Make code
	match comment.
	(refs_may_alias_p_1): For release branches return true if
	we are confused by our input.

From-SVN: r170650

gcc/ChangeLog

+2011-03-03  Richard Guenther  <rguenther@suse.de>
+
+	PR middle-end/47283
+	* tree-ssa-alias.c (ptr_deref_may_alias_decl_p): Make code
+	match comment.
+	(refs_may_alias_p_1): For release branches return true if
+	we are confused by our input.
+
 2011-03-03  Andreas Krebbel  <Andreas.Krebbel@de.ibm.com>
 
 	* config/s390/s390.c (s390_function_value): Rename to ...

gcc/tree-ssa-alias.c

@@ -178,7 +178,7 @@ ptr_deref_may_alias_decl_p (tree ptr, tree decl)
       || (TREE_CODE (decl) != VAR_DECL
 	  && TREE_CODE (decl) != PARM_DECL
 	  && TREE_CODE (decl) != RESULT_DECL))
-    return false;
+    return true;
 
   /* Disregard pointer offsetting.  */
   if (TREE_CODE (ptr) == POINTER_PLUS_EXPR)
@@ -1080,7 +1080,12 @@ refs_may_alias_p_1 (ao_ref *ref1, ao_ref *ref2, bool tbaa_p)
 				      ao_ref_alias_set (ref2), -1,
 				      tbaa_p);
 
+  /* We really do not want to end up here, but returning true is safe.  */
+#ifdef ENABLE_CHECKING
   gcc_unreachable ();
+#else
+  return true;
+#endif
 }
 
 bool