[gcc(refs/users/rguenth/heads/vect-force-slp)] Allow bigger SLP graphs

[Richard Biener <rguenth@gcc.gnu.org>]

https://gcc.gnu.org/g:8520f385b0f424d66d20db40ff1bb54cec063802

commit 8520f385b0f424d66d20db40ff1bb54cec063802
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Sep 29 13:05:01 2023 +0200

    Allow bigger SLP graphs
    
    When doing single-lane SLP discovery only we're easily running into
    the SLP graph size limit when patterns are involved.  The following
    ups the limit from the number of scalar stmts to the number of
    scalar or pattern stmts by using the number of stmt_vec_infos created.
    
            * tree-vect-loop.cc (vect_analyze_loop_2): Use the number
            of stmt_vec_infos created to limit the SLP graph size.

Diff:
---
 gcc/tree-vect-loop.cc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index 23c6e8259e7..490d4282ac8 100644
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -2723,8 +2723,10 @@ vect_analyze_loop_2 (loop_vec_info loop_vinfo, bool &fatal,
   if (slp)
     {
       /* Check the SLP opportunities in the loop, analyze and build
-	 SLP trees.  */
-      ok = vect_analyze_slp (loop_vinfo, LOOP_VINFO_N_STMTS (loop_vinfo));
+	 SLP trees.  Use the number of stmt_vec_infos as graph limit
+	 since that also includes pattern stmts which LOOP_VINFO_N_STMTS
+	 does not.  */
+      ok = vect_analyze_slp (loop_vinfo, loop_vinfo->stmt_vec_infos.length ());
       if (!ok)
 	return ok;