re PR tree-optimization/69042 (Missed optimization in ivopts)

	PR tree-optimization/69042
	* tree-ssa-loop-ivopts.c (add_iv_candidate_for_use): Add IV cand
	for use with constant offset stripped in base.

From-SVN: r234429

gcc/ChangeLog

+2016-03-23  Bin Cheng  <bin.cheng@arm.com>
+
+	PR tree-optimization/69042
+	* tree-ssa-loop-ivopts.c (add_iv_candidate_for_use): Add IV cand
+	for use with constant offset stripped in base.
+
 2016-03-23  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/70251

gcc/tree-ssa-loop-ivopts.c

@@ -3232,11 +3232,13 @@ add_iv_candidate_for_use (struct ivopts_data *data, struct iv_use *use)
     basetype = sizetype;
   record_common_cand (data, build_int_cst (basetype, 0), iv->step, use);
 
-  /* Record common candidate with constant offset stripped in base.  */
+  /* Record common candidate with constant offset stripped in base.
+     Like the use itself, we also add candidate directly for it.  */
+  base = strip_offset (iv->base, &offset);
+  if (offset || base != iv->base)
     {
-      base = strip_offset (iv->base, &offset);
-      if (offset || base != iv->base)
-	record_common_cand (data, base, iv->step, use);
+      record_common_cand (data, base, iv->step, use);
+      add_candidate (data, base, iv->step, false, use);
     }
 
   /* Record common candidate with base_object removed in base.  */