[35/46] Alter interfaces within vect_pattern_recog

vect_pattern_recog_1 took a gimple_stmt_iterator as argument, but was
only interested in the gsi_stmt, not anything else.  This patch makes
the associated routines operate directly on stmt_vec_infos.


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

gcc/
	* tree-vect-patterns.c (vect_mark_pattern_stmts): Take the
	original stmt as a stmt_vec_info rather than a gimple stmt.
	(vect_pattern_recog_1): Take the statement directly as a
	stmt_vec_info, rather than via a gimple_stmt_iterator.
	Update call to vect_mark_pattern_stmts.
	(vect_pattern_recog): Update calls accordingly.

On Tue, Jul 24, 2018 at 12:06 PM Richard Sandiford
<richard.sandiford@arm.com> wrote:
>
> vect_pattern_recog_1 took a gimple_stmt_iterator as argument, but was
> only interested in the gsi_stmt, not anything else.  This patch makes
> the associated routines operate directly on stmt_vec_infos.

OK

>
> 2018-07-24  Richard Sandiford  <richard.sandiford@arm.com>
>
> gcc/
>         * tree-vect-patterns.c (vect_mark_pattern_stmts): Take the
>         original stmt as a stmt_vec_info rather than a gimple stmt.
>         (vect_pattern_recog_1): Take the statement directly as a
>         stmt_vec_info, rather than via a gimple_stmt_iterator.
>         Update call to vect_mark_pattern_stmts.
>         (vect_pattern_recog): Update calls accordingly.
>
> Index: gcc/tree-vect-patterns.c
> ===================================================================
> --- gcc/tree-vect-patterns.c    2018-07-24 10:23:50.004602150 +0100
> +++ gcc/tree-vect-patterns.c    2018-07-24 10:23:59.408518638 +0100
> @@ -4720,29 +4720,29 @@ const unsigned int NUM_PATTERNS = ARRAY_
>  /* Mark statements that are involved in a pattern.  */
>
>  static inline void
> -vect_mark_pattern_stmts (gimple *orig_stmt, gimple *pattern_stmt,
> +vect_mark_pattern_stmts (stmt_vec_info orig_stmt_info, gimple *pattern_stmt,
>                           tree pattern_vectype)
>  {
> -  stmt_vec_info orig_stmt_info = vinfo_for_stmt (orig_stmt);
>    gimple *def_seq = STMT_VINFO_PATTERN_DEF_SEQ (orig_stmt_info);
>
> -  bool old_pattern_p = is_pattern_stmt_p (orig_stmt_info);
> -  if (old_pattern_p)
> +  gimple *orig_pattern_stmt = NULL;
> +  if (is_pattern_stmt_p (orig_stmt_info))
>      {
>        /* We're replacing a statement in an existing pattern definition
>          sequence.  */
> +      orig_pattern_stmt = orig_stmt_info->stmt;
>        if (dump_enabled_p ())
>         {
>           dump_printf_loc (MSG_NOTE, vect_location,
>                            "replacing earlier pattern ");
> -         dump_gimple_stmt (MSG_NOTE, TDF_SLIM, orig_stmt, 0);
> +         dump_gimple_stmt (MSG_NOTE, TDF_SLIM, orig_pattern_stmt, 0);
>         }
>
>        /* To keep the book-keeping simple, just swap the lhs of the
>          old and new statements, so that the old one has a valid but
>          unused lhs.  */
> -      tree old_lhs = gimple_get_lhs (orig_stmt);
> -      gimple_set_lhs (orig_stmt, gimple_get_lhs (pattern_stmt));
> +      tree old_lhs = gimple_get_lhs (orig_pattern_stmt);
> +      gimple_set_lhs (orig_pattern_stmt, gimple_get_lhs (pattern_stmt));
>        gimple_set_lhs (pattern_stmt, old_lhs);
>
>        if (dump_enabled_p ())
> @@ -4755,7 +4755,8 @@ vect_mark_pattern_stmts (gimple *orig_st
>        orig_stmt_info = STMT_VINFO_RELATED_STMT (orig_stmt_info);
>
>        /* We shouldn't be replacing the main pattern statement.  */
> -      gcc_assert (STMT_VINFO_RELATED_STMT (orig_stmt_info) != orig_stmt);
> +      gcc_assert (STMT_VINFO_RELATED_STMT (orig_stmt_info)->stmt
> +                 != orig_pattern_stmt);
>      }
>
>    if (def_seq)
> @@ -4763,13 +4764,14 @@ vect_mark_pattern_stmts (gimple *orig_st
>          !gsi_end_p (si); gsi_next (&si))
>        vect_init_pattern_stmt (gsi_stmt (si), orig_stmt_info, pattern_vectype);
>
> -  if (old_pattern_p)
> +  if (orig_pattern_stmt)
>      {
>        vect_init_pattern_stmt (pattern_stmt, orig_stmt_info, pattern_vectype);
>
>        /* Insert all the new pattern statements before the original one.  */
>        gimple_seq *orig_def_seq = &STMT_VINFO_PATTERN_DEF_SEQ (orig_stmt_info);
> -      gimple_stmt_iterator gsi = gsi_for_stmt (orig_stmt, orig_def_seq);
> +      gimple_stmt_iterator gsi = gsi_for_stmt (orig_pattern_stmt,
> +                                              orig_def_seq);
>        gsi_insert_seq_before_without_update (&gsi, def_seq, GSI_SAME_STMT);
>        gsi_insert_before_without_update (&gsi, pattern_stmt, GSI_SAME_STMT);
>
> @@ -4785,12 +4787,12 @@ vect_mark_pattern_stmts (gimple *orig_st
>     Input:
>     PATTERN_RECOG_FUNC: A pointer to a function that detects a certain
>          computation pattern.
> -   STMT: A stmt from which the pattern search should start.
> +   STMT_INFO: A stmt from which the pattern search should start.
>
>     If PATTERN_RECOG_FUNC successfully detected the pattern, it creates
>     a sequence of statements that has the same functionality and can be
> -   used to replace STMT.  It returns the last statement in the sequence
> -   and adds any earlier statements to STMT's STMT_VINFO_PATTERN_DEF_SEQ.
> +   used to replace STMT_INFO.  It returns the last statement in the sequence
> +   and adds any earlier statements to STMT_INFO's STMT_VINFO_PATTERN_DEF_SEQ.
>     PATTERN_RECOG_FUNC also sets *TYPE_OUT to the vector type of the final
>     statement, having first checked that the target supports the new operation
>     in that type.
> @@ -4799,10 +4801,10 @@ vect_mark_pattern_stmts (gimple *orig_st
>     for vect_recog_pattern.  */
>
>  static void
> -vect_pattern_recog_1 (vect_recog_func *recog_func, gimple_stmt_iterator si)
> +vect_pattern_recog_1 (vect_recog_func *recog_func, stmt_vec_info stmt_info)
>  {
> -  gimple *stmt = gsi_stmt (si), *pattern_stmt;
> -  stmt_vec_info stmt_info;
> +  vec_info *vinfo = stmt_info->vinfo;
> +  gimple *pattern_stmt;
>    loop_vec_info loop_vinfo;
>    tree pattern_vectype;
>
> @@ -4810,13 +4812,12 @@ vect_pattern_recog_1 (vect_recog_func *r
>       leave the original statement alone, since the first match wins.
>       Instead try to match against the definition statements that feed
>       the main pattern statement.  */
> -  stmt_info = vinfo_for_stmt (stmt);
>    if (STMT_VINFO_IN_PATTERN_P (stmt_info))
>      {
>        gimple_stmt_iterator gsi;
>        for (gsi = gsi_start (STMT_VINFO_PATTERN_DEF_SEQ (stmt_info));
>            !gsi_end_p (gsi); gsi_next (&gsi))
> -       vect_pattern_recog_1 (recog_func, gsi);
> +       vect_pattern_recog_1 (recog_func, vinfo->lookup_stmt (gsi_stmt (gsi)));
>        return;
>      }
>
> @@ -4841,7 +4842,7 @@ vect_pattern_recog_1 (vect_recog_func *r
>      }
>
>    /* Mark the stmts that are involved in the pattern. */
> -  vect_mark_pattern_stmts (stmt, pattern_stmt, pattern_vectype);
> +  vect_mark_pattern_stmts (stmt_info, pattern_stmt, pattern_vectype);
>
>    /* Patterns cannot be vectorized using SLP, because they change the order of
>       computation.  */
> @@ -4957,9 +4958,13 @@ vect_pattern_recog (vec_info *vinfo)
>         {
>           basic_block bb = bbs[i];
>           for (si = gsi_start_bb (bb); !gsi_end_p (si); gsi_next (&si))
> -           /* Scan over all generic vect_recog_xxx_pattern functions.  */
> -           for (j = 0; j < NUM_PATTERNS; j++)
> -             vect_pattern_recog_1 (&vect_vect_recog_func_ptrs[j], si);
> +           {
> +             stmt_vec_info stmt_info = vinfo->lookup_stmt (gsi_stmt (si));
> +             /* Scan over all generic vect_recog_xxx_pattern functions.  */
> +             for (j = 0; j < NUM_PATTERNS; j++)
> +               vect_pattern_recog_1 (&vect_vect_recog_func_ptrs[j],
> +                                     stmt_info);
> +           }
>         }
>      }
>    else
> @@ -4975,7 +4980,7 @@ vect_pattern_recog (vec_info *vinfo)
>
>           /* Scan over all generic vect_recog_xxx_pattern functions.  */
>           for (j = 0; j < NUM_PATTERNS; j++)
> -           vect_pattern_recog_1 (&vect_vect_recog_func_ptrs[j], si);
> +           vect_pattern_recog_1 (&vect_vect_recog_func_ptrs[j], stmt_info);
>         }
>      }
>  }