This adds dumping to vect_slp_analyze_node_alignment when it fails
an SLP instance due to shared vector type conflicts.
Bootstrapped / tested on x86_64-unknwon-linux-gnu, pushed.
2020-10-28 Richard Biener <rguent...@suse.de>
* tree-vect-data-refs.c (vect_slp_analyze_node_alignment):
Dump when vect_update_shared_vectype fails.
---
gcc/tree-vect-data-refs.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/gcc/tree-vect-data-refs.c b/gcc/tree-vect-data-refs.c
index 4abd27e4c70..fd14b480dbf 100644
--- a/gcc/tree-vect-data-refs.c
+++ b/gcc/tree-vect-data-refs.c
@@ -2428,7 +2428,13 @@ vect_slp_analyze_node_alignment (vec_info *vinfo,
slp_tree node)
/* We need to commit to a vector type for the group now. */
if (is_a <bb_vec_info> (vinfo)
&& !vect_update_shared_vectype (first_stmt_info, SLP_TREE_VECTYPE
(node)))
- return false;
+ {
+ if (dump_enabled_p ())
+ dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
+ "desired vector type conflicts with earlier one "
+ "for %G", first_stmt_info->stmt);
+ return false;
+ }
dr_vec_info *dr_info = STMT_VINFO_DR_INFO (first_stmt_info);
vect_compute_data_ref_alignment (vinfo, dr_info);
--
2.26.2
