[41/46] Add vec_info::remove_stmt

This patch adds a new helper function for permanently removing a
statement and its associated stmt_vec_info.


2018-07-24  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* tree-vectorizer.h (vec_info::remove_stmt): Declare.
	* tree-vectorizer.c (vec_info::remove_stmt): New function.
	* tree-vect-loop-manip.c (vect_set_loop_condition): Use it.
	* tree-vect-loop.c (vect_transform_loop): Likewise.
	* tree-vect-slp.c (vect_schedule_slp): Likewise.
	* tree-vect-stmts.c (vect_remove_stores): Likewise.

On Tue, Jul 24, 2018 at 12:09 PM Richard Sandiford
<richard.sandiford@arm.com> wrote:
>
> This patch adds a new helper function for permanently removing a
> statement and its associated stmt_vec_info.

OK.

>
> 2018-07-24  Richard Sandiford  <richard.sandiford@arm.com>
>
> gcc/
>         * tree-vectorizer.h (vec_info::remove_stmt): Declare.
>         * tree-vectorizer.c (vec_info::remove_stmt): New function.
>         * tree-vect-loop-manip.c (vect_set_loop_condition): Use it.
>         * tree-vect-loop.c (vect_transform_loop): Likewise.
>         * tree-vect-slp.c (vect_schedule_slp): Likewise.
>         * tree-vect-stmts.c (vect_remove_stores): Likewise.
>
> Index: gcc/tree-vectorizer.h
> ===================================================================
> --- gcc/tree-vectorizer.h       2018-07-24 10:24:16.552366384 +0100
> +++ gcc/tree-vectorizer.h       2018-07-24 10:24:19.544339803 +0100
> @@ -241,6 +241,7 @@ struct vec_info {
>    stmt_vec_info lookup_def (tree);
>    stmt_vec_info lookup_single_use (tree);
>    stmt_vec_info lookup_dr (data_reference *);
> +  void remove_stmt (stmt_vec_info);
>
>    /* The type of vectorization.  */
>    vec_kind kind;
> Index: gcc/tree-vectorizer.c
> ===================================================================
> --- gcc/tree-vectorizer.c       2018-07-24 10:24:16.552366384 +0100
> +++ gcc/tree-vectorizer.c       2018-07-24 10:24:19.544339803 +0100
> @@ -577,6 +577,20 @@ vec_info::lookup_dr (data_reference *dr)
>    return stmt_info;
>  }
>
> +/* Permanently remove the statement described by STMT_INFO from the
> +   function.  */
> +
> +void
> +vec_info::remove_stmt (stmt_vec_info stmt_info)
> +{
> +  gcc_assert (!stmt_info->pattern_stmt_p);
> +  gimple_stmt_iterator si = gsi_for_stmt (stmt_info->stmt);
> +  unlink_stmt_vdef (stmt_info->stmt);
> +  gsi_remove (&si, true);
> +  release_defs (stmt_info->stmt);
> +  free_stmt_vec_info (stmt_info);
> +}
> +
>  /* A helper function to free scev and LOOP niter information, as well as
>     clear loop constraint LOOP_C_FINITE.  */
>
> Index: gcc/tree-vect-loop-manip.c
> ===================================================================
> --- gcc/tree-vect-loop-manip.c  2018-07-24 10:24:16.552366384 +0100
> +++ gcc/tree-vect-loop-manip.c  2018-07-24 10:24:19.540339838 +0100
> @@ -935,8 +935,12 @@ vect_set_loop_condition (struct loop *lo
>                                                   loop_cond_gsi);
>
>    /* Remove old loop exit test.  */
> -  gsi_remove (&loop_cond_gsi, true);
> -  free_stmt_vec_info (orig_cond);
> +  stmt_vec_info orig_cond_info;
> +  if (loop_vinfo
> +      && (orig_cond_info = loop_vinfo->lookup_stmt (orig_cond)))
> +    loop_vinfo->remove_stmt (orig_cond_info);
> +  else
> +    gsi_remove (&loop_cond_gsi, true);
>
>    if (dump_enabled_p ())
>      {
> Index: gcc/tree-vect-loop.c
> ===================================================================
> --- gcc/tree-vect-loop.c        2018-07-24 10:24:12.252404574 +0100
> +++ gcc/tree-vect-loop.c        2018-07-24 10:24:19.540339838 +0100
> @@ -8487,28 +8487,18 @@ vect_transform_loop (loop_vec_info loop_
>                   vect_transform_loop_stmt (loop_vinfo, stmt_info, &si,
>                                             &seen_store, &slp_scheduled);
>                 }
> +             gsi_next (&si);
>               if (seen_store)
>                 {
>                   if (STMT_VINFO_GROUPED_ACCESS (seen_store))
> -                   {
> -                     /* Interleaving.  If IS_STORE is TRUE, the
> -                        vectorization of the interleaving chain was
> -                        completed - free all the stores in the chain.  */
> -                     gsi_next (&si);
> -                     vect_remove_stores (DR_GROUP_FIRST_ELEMENT (seen_store));
> -                   }
> +                   /* Interleaving.  If IS_STORE is TRUE, the
> +                      vectorization of the interleaving chain was
> +                      completed - free all the stores in the chain.  */
> +                   vect_remove_stores (DR_GROUP_FIRST_ELEMENT (seen_store));
>                   else
> -                   {
> -                     /* Free the attached stmt_vec_info and remove the
> -                        stmt.  */
> -                     free_stmt_vec_info (stmt);
> -                     unlink_stmt_vdef (stmt);
> -                     gsi_remove (&si, true);
> -                     release_defs (stmt);
> -                   }
> +                   /* Free the attached stmt_vec_info and remove the stmt.  */
> +                   loop_vinfo->remove_stmt (stmt_info);
>                 }
> -             else
> -               gsi_next (&si);
>             }
>         }
>
> Index: gcc/tree-vect-slp.c
> ===================================================================
> --- gcc/tree-vect-slp.c 2018-07-24 10:24:02.360492422 +0100
> +++ gcc/tree-vect-slp.c 2018-07-24 10:24:19.540339838 +0100
> @@ -4087,7 +4087,6 @@ vect_schedule_slp (vec_info *vinfo)
>        slp_tree root = SLP_INSTANCE_TREE (instance);
>        stmt_vec_info store_info;
>        unsigned int j;
> -      gimple_stmt_iterator gsi;
>
>        /* Remove scalar call stmts.  Do not do this for basic-block
>          vectorization as not all uses may be vectorized.
> @@ -4108,11 +4107,7 @@ vect_schedule_slp (vec_info *vinfo)
>           if (store_info->pattern_stmt_p)
>             store_info = STMT_VINFO_RELATED_STMT (store_info);
>           /* Free the attached stmt_vec_info and remove the stmt.  */
> -         gsi = gsi_for_stmt (store_info);
> -         unlink_stmt_vdef (store_info);
> -         gsi_remove (&gsi, true);
> -         release_defs (store_info);
> -         free_stmt_vec_info (store_info);
> +         vinfo->remove_stmt (store_info);
>          }
>      }
>
> Index: gcc/tree-vect-stmts.c
> ===================================================================
> --- gcc/tree-vect-stmts.c       2018-07-24 10:24:08.924434128 +0100
> +++ gcc/tree-vect-stmts.c       2018-07-24 10:24:19.544339803 +0100
> @@ -9842,8 +9842,8 @@ vect_transform_stmt (stmt_vec_info stmt_
>  void
>  vect_remove_stores (stmt_vec_info first_stmt_info)
>  {
> +  vec_info *vinfo = first_stmt_info->vinfo;
>    stmt_vec_info next_stmt_info = first_stmt_info;
> -  gimple_stmt_iterator next_si;
>
>    while (next_stmt_info)
>      {
> @@ -9851,11 +9851,7 @@ vect_remove_stores (stmt_vec_info first_
>        if (next_stmt_info->pattern_stmt_p)
>         next_stmt_info = STMT_VINFO_RELATED_STMT (next_stmt_info);
>        /* Free the attached stmt_vec_info and remove the stmt.  */
> -      next_si = gsi_for_stmt (next_stmt_info->stmt);
> -      unlink_stmt_vdef (next_stmt_info->stmt);
> -      gsi_remove (&next_si, true);
> -      release_defs (next_stmt_info->stmt);
> -      free_stmt_vec_info (next_stmt_info);
> +      vinfo->remove_stmt (next_stmt_info);
>        next_stmt_info = tmp;
>      }
>  }