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[PATCH] Fix PR56521

VN now inserts all sorts of calls into the references hashtable,
not only those which produce a value.  This results in missing
initializations of ->value_id which eventually PRE ends up

The following fixes that.

Bootstrap and regtest pending on x86_64-unknown-linux-gnu.


2013-03-05  Richard Biener  <>

	* tree-ssa-sccvn.c (set_value_id_for_result): For a NULL
	result set a new value-id.

Index: gcc/tree-ssa-sccvn.c
--- gcc/tree-ssa-sccvn.c	(revision 196451)
+++ gcc/tree-ssa-sccvn.c	(working copy)
@@ -3954,7 +3962,7 @@ free_scc_vn (void)
   XDELETE (optimistic_info);
-/* Set *ID if we computed something useful in RESULT.  */
+/* Set *ID according to RESULT.  */
 static void
 set_value_id_for_result (tree result, unsigned int *id)
@@ -3966,6 +3974,8 @@ set_value_id_for_result (tree result, un
       else if (is_gimple_min_invariant (result))
 	*id = get_or_alloc_constant_value_id (result);
+  else
+    *id = get_next_value_id ();
 /* Set the value ids in the valid hash tables.  */

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