[02/11] Remove vect_schedule_slp return value

Nothing now uses the vect_schedule_slp return value, so it's not worth
propagating the value through vect_schedule_slp_instance.


2018-07-30  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* tree-vectorizer.h (vect_schedule_slp): Return void.
	* tree-vect-slp.c (vect_schedule_slp_instance): Likewise.
	(vect_schedule_slp): Likewise.

On Mon, Jul 30, 2018 at 1:37 PM Richard Sandiford
<richard.sandiford@arm.com> wrote:
>
> Nothing now uses the vect_schedule_slp return value, so it's not worth
> propagating the value through vect_schedule_slp_instance.

OK.

>
> 2018-07-30  Richard Sandiford  <richard.sandiford@arm.com>
>
> gcc/
>         * tree-vectorizer.h (vect_schedule_slp): Return void.
>         * tree-vect-slp.c (vect_schedule_slp_instance): Likewise.
>         (vect_schedule_slp): Likewise.
>
> Index: gcc/tree-vectorizer.h
> ===================================================================
> --- gcc/tree-vectorizer.h       2018-07-30 12:32:09.114687014 +0100
> +++ gcc/tree-vectorizer.h       2018-07-30 12:32:19.366596715 +0100
> @@ -1575,7 +1575,7 @@ extern bool vect_transform_slp_perm_load
>                                           gimple_stmt_iterator *, poly_uint64,
>                                           slp_instance, bool, unsigned *);
>  extern bool vect_slp_analyze_operations (vec_info *);
> -extern bool vect_schedule_slp (vec_info *);
> +extern void vect_schedule_slp (vec_info *);
>  extern bool vect_analyze_slp (vec_info *, unsigned);
>  extern bool vect_make_slp_decision (loop_vec_info);
>  extern void vect_detect_hybrid_slp (loop_vec_info);
> Index: gcc/tree-vect-slp.c
> ===================================================================
> --- gcc/tree-vect-slp.c 2018-07-30 12:32:09.026687790 +0100
> +++ gcc/tree-vect-slp.c 2018-07-30 12:32:19.366596715 +0100
> @@ -3849,11 +3849,11 @@ vect_transform_slp_perm_load (slp_tree n
>
>  /* Vectorize SLP instance tree in postorder.  */
>
> -static bool
> +static void
>  vect_schedule_slp_instance (slp_tree node, slp_instance instance,
>                             scalar_stmts_to_slp_tree_map_t *bst_map)
>  {
> -  bool grouped_store, is_store;
> +  bool grouped_store;
>    gimple_stmt_iterator si;
>    stmt_vec_info stmt_info;
>    unsigned int group_size;
> @@ -3862,14 +3862,14 @@ vect_schedule_slp_instance (slp_tree nod
>    slp_tree child;
>
>    if (SLP_TREE_DEF_TYPE (node) != vect_internal_def)
> -    return false;
> +    return;
>
>    /* See if we have already vectorized the same set of stmts and reuse their
>       vectorized stmts.  */
>    if (slp_tree *leader = bst_map->get (SLP_TREE_SCALAR_STMTS (node)))
>      {
>        SLP_TREE_VEC_STMTS (node).safe_splice (SLP_TREE_VEC_STMTS (*leader));
> -      return false;
> +      return;
>      }
>
>    bst_map->put (SLP_TREE_SCALAR_STMTS (node).copy (), node);
> @@ -3991,11 +3991,10 @@ vect_schedule_slp_instance (slp_tree nod
>             }
>           v0.release ();
>           v1.release ();
> -         return false;
> +         return;
>         }
>      }
> -  is_store = vect_transform_stmt (stmt_info, &si, &grouped_store, node,
> -                                 instance);
> +  vect_transform_stmt (stmt_info, &si, &grouped_store, node, instance);
>
>    /* Restore stmt def-types.  */
>    FOR_EACH_VEC_ELT (SLP_TREE_CHILDREN (node), i, child)
> @@ -4005,8 +4004,6 @@ vect_schedule_slp_instance (slp_tree nod
>         FOR_EACH_VEC_ELT (SLP_TREE_SCALAR_STMTS (child), j, child_stmt_info)
>           STMT_VINFO_DEF_TYPE (child_stmt_info) = vect_internal_def;
>        }
> -
> -  return is_store;
>  }
>
>  /* Replace scalar calls from SLP node NODE with setting of their lhs to zero.
> @@ -4048,14 +4045,12 @@ vect_remove_slp_scalar_calls (slp_tree n
>
>  /* Generate vector code for all SLP instances in the loop/basic block.  */
>
> -bool
> +void
>  vect_schedule_slp (vec_info *vinfo)
>  {
>    vec<slp_instance> slp_instances;
>    slp_instance instance;
>    unsigned int i;
> -  bool is_store = false;
> -
>
>    scalar_stmts_to_slp_tree_map_t *bst_map
>      = new scalar_stmts_to_slp_tree_map_t ();
> @@ -4063,8 +4058,8 @@ vect_schedule_slp (vec_info *vinfo)
>    FOR_EACH_VEC_ELT (slp_instances, i, instance)
>      {
>        /* Schedule the tree of INSTANCE.  */
> -      is_store = vect_schedule_slp_instance (SLP_INSTANCE_TREE (instance),
> -                                             instance, bst_map);
> +      vect_schedule_slp_instance (SLP_INSTANCE_TREE (instance),
> +                                 instance, bst_map);
>        if (dump_enabled_p ())
>         dump_printf_loc (MSG_NOTE, vect_location,
>                           "vectorizing stmts using SLP.\n");
> @@ -4099,6 +4094,4 @@ vect_schedule_slp (vec_info *vinfo)
>           vinfo->remove_stmt (store_info);
>          }
>      }
> -
> -  return is_store;
>  }