Index: gcc/opts.c
===================================================================
--- gcc/opts.c	(revision 276795)+++ gcc/opts.c	(working copy)
+++ gcc/opts.c	(working copy)
@@ -1123,24 +1123,6 @@ finish_options (struct gcc_options *opts
       && !opts_set->x_flag_reorder_functions)
     opts->x_flag_reorder_functions = 1;
 
-  /* Tune vectorization related parametees according to cost model.  */
-  if (opts->x_flag_vect_cost_model == VECT_COST_MODEL_CHEAP)
-    {
-      maybe_set_param_value (PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS,
-            6, opts->x_param_values, opts_set->x_param_values);
-      maybe_set_param_value (PARAM_VECT_MAX_VERSION_FOR_ALIGNMENT_CHECKS,
-            0, opts->x_param_values, opts_set->x_param_values);
-      maybe_set_param_value (PARAM_VECT_MAX_PEELING_FOR_ALIGNMENT,
-            0, opts->x_param_values, opts_set->x_param_values);
-    }
-
-  /* Set PARAM_MAX_STORES_TO_SINK to 0 if either vectorization or if-conversion
-     is disabled.  */
-  if ((!opts->x_flag_tree_loop_vectorize && !opts->x_flag_tree_slp_vectorize)
-       || !opts->x_flag_tree_loop_if_convert)
-    maybe_set_param_value (PARAM_MAX_STORES_TO_SINK, 0,
-                           opts->x_param_values, opts_set->x_param_values);
-
   /* The -gsplit-dwarf option requires -ggnu-pubnames.  */
   if (opts->x_dwarf_split_debug_info)
     opts->x_debug_generate_pub_sections = 2;
Index: gcc/tree-vect-data-refs.c
===================================================================
--- gcc/tree-vect-data-refs.c	(revision 276795)
+++ gcc/tree-vect-data-refs.c	(working copy)
@@ -2075,6 +2075,8 @@ vect_enhance_data_refs_alignment (loop_v
         {
           unsigned max_allowed_peel
             = PARAM_VALUE (PARAM_VECT_MAX_PEELING_FOR_ALIGNMENT);
+	  if (flag_vect_cost_model == VECT_COST_MODEL_CHEAP)
+	    max_allowed_peel = 0;
           if (max_allowed_peel != (unsigned)-1)
             {
               unsigned max_peel = npeel;
@@ -2168,15 +2170,16 @@ vect_enhance_data_refs_alignment (loop_v
   /* (2) Versioning to force alignment.  */
 
   /* Try versioning if:
-     1) optimize loop for speed
+     1) optimize loop for speed and the cost-model is not cheap
      2) there is at least one unsupported misaligned data ref with an unknown
         misalignment, and
      3) all misaligned data refs with a known misalignment are supported, and
      4) the number of runtime alignment checks is within reason.  */
 
-  do_versioning =
-	optimize_loop_nest_for_speed_p (loop)
-	&& (!loop->inner); /* FORNOW */
+  do_versioning
+    = (optimize_loop_nest_for_speed_p (loop)
+       && !loop->inner /* FORNOW */
+       && flag_vect_cost_model > VECT_COST_MODEL_CHEAP);
 
   if (do_versioning)
     {
@@ -3641,13 +3644,15 @@ vect_prune_runtime_alias_test_list (loop
     dump_printf_loc (MSG_NOTE, vect_location,
 		     "improved number of alias checks from %d to %d\n",
 		     may_alias_ddrs.length (), count);
-  if ((int) count > PARAM_VALUE (PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS))
+  unsigned limit = PARAM_VALUE (PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS);
+  if (flag_simd_cost_model == VECT_COST_MODEL_CHEAP)
+    limit = default_param_value
+	      (PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS) * 6 / 10;
+  if (count > limit)
     return opt_result::failure_at
       (vect_location,
-       "number of versioning for alias "
-       "run-time tests exceeds %d "
-       "(--param vect-max-version-for-alias-checks)\n",
-       PARAM_VALUE (PARAM_VECT_MAX_VERSION_FOR_ALIAS_CHECKS));
+       "number of versioning for alias run-time tests exceeds %d "
+       "(--param vect-max-version-for-alias-checks)\n", limit);
 
   return opt_result::success ();
 }
Index: gcc/tree-ssa-phiopt.c
===================================================================
--- gcc/tree-ssa-phiopt.c	(revision 276795)
+++ gcc/tree-ssa-phiopt.c	(working copy)
@@ -2467,7 +2467,11 @@ cond_if_else_store_replacement (basic_bl
 						 then_assign, else_assign);
     }
 
-  if (MAX_STORES_TO_SINK == 0)
+  /* If either vectorization or if-conversion is disabled then do
+     not sink any stores.  */
+  if (MAX_STORES_TO_SINK == 0
+      || (!flag_tree_loop_vectorize && !flag_tree_slp_vectorize)
+      || !flag_tree_loop_if_convert)
     return false;
 
   /* Find data references.  */
