tree-vect-data-refs.c (vect_compute_data_ref_alignment): Look at the…

tree-vect-data-refs.c (vect_compute_data_ref_alignment): Look at the DR_BASE_ADDRESS object for forcing alignment.

2016-11-09  Richard Biener  <rguenther@suse.de>

	* tree-vect-data-refs.c (vect_compute_data_ref_alignment):
	Look at the DR_BASE_ADDRESS object for forcing alignment.

From-SVN: r241991

gcc/ChangeLog

+2016-11-09  Richard Biener  <rguenther@suse.de>
+
+	* tree-vect-data-refs.c (vect_compute_data_ref_alignment):
+	Look at the DR_BASE_ADDRESS object for forcing alignment.
+
 2016-11-09  Kugan Vivekanandarajah  <kuganv@linaro.org>
 
 	* ipa-cp.c (ipa_get_jf_pass_through_result): Handle unary expressions.

gcc/tree-vect-data-refs.c

@@ -813,12 +813,9 @@ vect_compute_data_ref_alignment (struct data_reference *dr)
 
   if (base_alignment < TYPE_ALIGN (vectype))
     {
-      /* Strip an inner MEM_REF to a bare decl if possible.  */
-      if (TREE_CODE (base) == MEM_REF
-	  && integer_zerop (TREE_OPERAND (base, 1))
-	  && TREE_CODE (TREE_OPERAND (base, 0)) == ADDR_EXPR)
-	base = TREE_OPERAND (TREE_OPERAND (base, 0), 0);
-
+      base = base_addr;
+      if (TREE_CODE (base) == ADDR_EXPR)
+	base = TREE_OPERAND (base, 0);
       if (!vect_can_force_dr_alignment_p (base, TYPE_ALIGN (vectype)))
 	{
 	  if (dump_enabled_p ())