[02/13] Pass vec_perm_indices by reference

[Richard Sandiford]

This patch makes functions take vec_perm_indices by reference rather
than value, since a later patch will turn vec_perm_indices into a class
that would be more expensive to copy.


2017-12-06  Richard Sandiford  <richard.sandif...@linaro.org>

gcc/
        * fold-const.c (fold_vec_perm): Take a const vec_perm_indices &
        instead of vec_perm_indices.
        * tree-vectorizer.h (vect_gen_perm_mask_any): Likewise,
        (vect_gen_perm_mask_checked): Likewise,
        * tree-vect-stmts.c (vect_gen_perm_mask_any): Likewise,
        (vect_gen_perm_mask_checked): Likewise,

Index: gcc/fold-const.c
===================================================================
--- gcc/fold-const.c    2017-12-09 22:47:11.840391388 +0000
+++ gcc/fold-const.c    2017-12-09 22:47:19.119312754 +0000
@@ -8801,7 +8801,7 @@ vec_cst_ctor_to_array (tree arg, unsigne
    NULL_TREE otherwise.  */
 
 static tree
-fold_vec_perm (tree type, tree arg0, tree arg1, vec_perm_indices sel)
+fold_vec_perm (tree type, tree arg0, tree arg1, const vec_perm_indices &sel)
 {
   unsigned int i;
   bool need_ctor = false;
Index: gcc/tree-vectorizer.h
===================================================================
--- gcc/tree-vectorizer.h       2017-12-09 22:47:11.840391388 +0000
+++ gcc/tree-vectorizer.h       2017-12-09 22:47:19.120312754 +0000
@@ -1204,8 +1204,8 @@ extern void vect_get_load_cost (struct d
 extern void vect_get_store_cost (struct data_reference *, int,
                                 unsigned int *, stmt_vector_for_cost *);
 extern bool vect_supportable_shift (enum tree_code, tree);
-extern tree vect_gen_perm_mask_any (tree, vec_perm_indices);
-extern tree vect_gen_perm_mask_checked (tree, vec_perm_indices);
+extern tree vect_gen_perm_mask_any (tree, const vec_perm_indices &);
+extern tree vect_gen_perm_mask_checked (tree, const vec_perm_indices &);
 extern void optimize_mask_stores (struct loop*);
 
 /* In tree-vect-data-refs.c.  */
Index: gcc/tree-vect-stmts.c
===================================================================
--- gcc/tree-vect-stmts.c       2017-12-09 22:47:11.840391388 +0000
+++ gcc/tree-vect-stmts.c       2017-12-09 22:47:19.119312754 +0000
@@ -6506,7 +6506,7 @@ vectorizable_store (gimple *stmt, gimple
    vect_gen_perm_mask_checked.  */
 
 tree
-vect_gen_perm_mask_any (tree vectype, vec_perm_indices sel)
+vect_gen_perm_mask_any (tree vectype, const vec_perm_indices &sel)
 {
   tree mask_elt_type, mask_type;
 
@@ -6527,7 +6527,7 @@ vect_gen_perm_mask_any (tree vectype, ve
    i.e. that the target supports the pattern _for arbitrary input vectors_.  */
 
 tree
-vect_gen_perm_mask_checked (tree vectype, vec_perm_indices sel)
+vect_gen_perm_mask_checked (tree vectype, const vec_perm_indices &sel)
 {
   gcc_assert (can_vec_perm_p (TYPE_MODE (vectype), false, &sel));
   return vect_gen_perm_mask_any (vectype, sel);