Improve SLP codegen, avoiding unnecessary TREE_ADDRESSABLE

The following adjusts vectorizer code generation to avoid splitting
out address increments for invariant addresses which causes objects
to get TREE_ADDRESSABLE when not necessary.

	* tree-vect-data-refs.cc (bump_vector_ptr): Return an
	invariant updated address when the input was invariant.

diff --git a/gcc/tree-vect-data-refs.cc b/gcc/tree-vect-data-refs.cc
index 609cacc4971be528e5b79969c6bfe22a99599d94..b279a82551eb70379804d405983ae5dc44b66bf5 100644 (file)
--- a/gcc/tree-vect-data-refs.cc
+++ b/gcc/tree-vect-data-refs.cc
@@ -5195,6 +5195,14 @@ bump_vector_ptr (vec_info *vinfo,
 
   if (TREE_CODE (dataref_ptr) == SSA_NAME)
     new_dataref_ptr = copy_ssa_name (dataref_ptr);
+  else if (is_gimple_min_invariant (dataref_ptr))
+    /* When possible avoid emitting a separate increment stmt that will
+       force the addressed object addressable.  */
+    return build1 (ADDR_EXPR, TREE_TYPE (dataref_ptr),
+                  fold_build2 (MEM_REF,
+                               TREE_TYPE (TREE_TYPE (dataref_ptr)),
+                               dataref_ptr,
+                               fold_convert (ptr_type_node, update)));
   else
     new_dataref_ptr = make_ssa_name (TREE_TYPE (dataref_ptr));
   incr_stmt = gimple_build_assign (new_dataref_ptr, POINTER_PLUS_EXPR,