2012-01-04  Jakub Jelinek  <jakub@redhat.com>

	PR debug/51746
	* var-tracking.c (add_stores): For COND_EXEC allow oval to be NULL.

--- gcc/var-tracking.c.jj	2012-01-01 19:54:46.000000000 +0100
+++ gcc/var-tracking.c	2012-01-04 11:30:44.033223790 +0100
@@ -5519,7 +5519,7 @@ add_stores (rtx loc, const_rtx expr, voi
       gcc_assert (oval != v);
       gcc_assert (REG_P (oloc) || MEM_P (oloc));
 
-      if (!cselib_preserved_value_p (oval))
+      if (oval && !cselib_preserved_value_p (oval))
 	{
 	  micro_operation moa;