This adds a missing check.
Bootstrap & regtest running on x86_64-unknown-linux-gnu.
2020-11-06 Richard Biener <rguent...@suse.de>
PR tree-optimization/97733
* tree-vect-slp.c (vect_analyze_slp_instance): If less
than two reductions were relevant or live do nothing.
---
gcc/tree-vect-slp.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c
index 9c63983b625..4d1f17bd3fa 100644
--- a/gcc/tree-vect-slp.c
+++ b/gcc/tree-vect-slp.c
@@ -2539,6 +2539,9 @@ vect_analyze_slp_instance (vec_info *vinfo,
if (STMT_VINFO_RELEVANT_P (next_info)
|| STMT_VINFO_LIVE_P (next_info))
scalar_stmts.quick_push (next_info);
+ /* If less than two were relevant/live there's nothing to SLP. */
+ if (scalar_stmts.length () < 2)
+ return false;
}
/* Build the tree for the SLP instance. */
--
2.26.2
