Index: params.def
===================================================================
--- params.def	(revision 202834)
+++ params.def	(working copy)
@@ -544,6 +544,11 @@ DEFPARAM(PARAM_VECT_MAX_VERSION_FOR_ALIA
          "Bound on number of runtime checks inserted by the vectorizer's loop versioning for alias check",
          10, 0, 0)
 
+DEFPARAM(PARAM_VECT_MAX_PEELING_FOR_ALIGNMENT,
+         "vect-max-peeling-for-alignment",
+         "Max number of loop peels to enhancement alignment of data references in a loop",
+         -1, 0, 0)
+
 DEFPARAM(PARAM_MAX_CSELIB_MEMORY_LOCATIONS,
 	 "max-cselib-memory-locations",
 	 "The maximum memory locations recorded by cselib",
Index: tree-vect-data-refs.c
===================================================================
--- tree-vect-data-refs.c	(revision 202834)
+++ tree-vect-data-refs.c	(working copy)
@@ -1718,6 +1718,30 @@ vect_enhance_data_refs_alignment (loop_v
 
       if (do_peeling)
         {
+          unsigned max_allowed_peel
+            = PARAM_VALUE (PARAM_VECT_MAX_PEELING_FOR_ALIGNMENT);
+          if (max_allowed_peel != (unsigned)-1)
+            {
+              unsigned max_peel = npeel;
+              if (max_peel == 0)
+                {
+                  gimple dr_stmt = DR_STMT (dr0);
+                  stmt_vec_info vinfo = vinfo_for_stmt (dr_stmt);
+                  tree vtype = STMT_VINFO_VECTYPE (vinfo);
+                  max_peel = TYPE_VECTOR_SUBPARTS (vtype) - 1;
+                }
+              if (max_peel > max_allowed_peel)
+                {
+                  do_peeling = false;
+                  if (dump_enabled_p ())
+                    dump_printf_loc (MSG_NOTE, vect_location,
+                        "Disable peeling, max peels reached: %d\n", max_peel);
+                }
+            }
+        }
+
+      if (do_peeling)
+        {
 	  stmt_info_for_cost *si;
 	  void *data = LOOP_VINFO_TARGET_COST_DATA (loop_vinfo);
 
Index: doc/invoke.texi
===================================================================
--- doc/invoke.texi	(revision 202834)
+++ doc/invoke.texi	(working copy)
@@ -9451,6 +9451,10 @@ The maximum number of run-time checks th
 doing loop versioning for alias in the vectorizer.  See option
 @option{-ftree-vect-loop-version} for more information.
 
+@item vect-max-peeling-for-alignment
+The maximum number of loop peels to enhance access alignment
+for vectorizer. Value -1 means 'no limit'.
+
 @item max-iterations-to-track
 The maximum number of iterations of a loop the brute-force algorithm
 for analysis of the number of iterations of the loop tries to evaluate.