re PR tree-optimization/52210 (vect_model_simple_cost: reading uninitialised memory)

	PR tree-optimization/52210
	* tree-vect-slp.c (vect_get_and_check_slp_defs): Call
	vect_model_simple_cost with two entry vect_def_type array instead
	of an address of dt.

	* gcc.dg/pr52210.c: New test.

From-SVN: r184201

gcc/ChangeLog

+2012-02-14  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/52210
+	* tree-vect-slp.c (vect_get_and_check_slp_defs): Call
+	vect_model_simple_cost with two entry vect_def_type array instead
+	of an address of dt.
+
 2012-02-14  Richard Guenther  <rguenther@suse.de>
 
 	PR lto/52178

gcc/testsuite/ChangeLog

+2012-02-14  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/52210
+	* gcc.dg/pr52210.c: New test.
+
 2012-02-14  Jason Merrill  <jason@redhat.com>
 
 	PR c++/39055

gcc/testsuite/gcc.dg/pr52210.c

+/* PR tree-optimization/52210 */
+/* { dg-do compile } */
+/* { dg-options "-O3" } */
+
+void
+foo (long *x, long y, long z)
+{
+  long a = x[0];
+  long b = x[1];
+  x[0] = a & ~y;
+  x[1] = b & ~z;
+}

gcc/tree-vect-slp.c

@@ -321,10 +321,15 @@ vect_get_and_check_slp_defs (loop_vec_info loop_vinfo, bb_vec_info bb_vinfo,
                 vect_model_store_cost (stmt_info, ncopies_for_cost, false,
                                         dt, slp_node);
 	      else
-	        /* Not memory operation (we don't call this function for
-		   loads).  */
-		vect_model_simple_cost (stmt_info, ncopies_for_cost, &dt,
-					slp_node);
+		{
+		  enum vect_def_type dts[2];
+		  dts[0] = dt;
+		  dts[1] = vect_uninitialized_def;
+		  /* Not memory operation (we don't call this function for
+		     loads).  */
+		  vect_model_simple_cost (stmt_info, ncopies_for_cost, dts,
+					  slp_node);
+		}
 	    }
 	}
       else