tree-ssa-address.c (copy_ref_info): Check NULL TMR_STEP when TMR_INDEX is non-NULL.

	* tree-ssa-address.c (copy_ref_info): Check NULL TMR_STEP when
	TMR_INDEX is non-NULL.

From-SVN: r236593

gcc/ChangeLog

+2016-05-23 Bin Cheng  <bin.cheng@arm.com>
+
+	* tree-ssa-address.c (copy_ref_info): Check NULL TMR_STEP when
+	TMR_INDEX is non-NULL.
+
 2016-05-23  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/71230

gcc/tree-ssa-address.c

@@ -877,6 +877,10 @@ copy_ref_info (tree new_ref, tree old_ref)
 	      && TREE_CODE (old_ref) == MEM_REF
 	      && !(TREE_CODE (new_ref) == TARGET_MEM_REF
 		   && (TMR_INDEX2 (new_ref)
+		       /* TODO: Below conditions can be relaxed if TMR_INDEX
+			  is an indcution variable and its initial value and
+			  step are aligned.  */
+		       || (TMR_INDEX (new_ref) && !TMR_STEP (new_ref))
 		       || (TMR_STEP (new_ref)
 			   && (TREE_INT_CST_LOW (TMR_STEP (new_ref))
 			       < align)))))