When we have a non-grouped access we bogously multiply by zero.
This shows most with single-lane SLP but also happens with
the multi-lane splat case.
Re-bootstrap & regtest running on x86_64-unknown-linux-gnu.
I've ran into this latent bug on the force-slp branch.
Richard.
* tree-vect-data-refs.cc (vect_enhance_data_refs_alignment):
Properly guard DR_GROUP_SIZE access with STMT_VINFO_GROUPED_ACCESS.
---
gcc/tree-vect-data-refs.cc | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/gcc/tree-vect-data-refs.cc b/gcc/tree-vect-data-refs.cc
index c531079d3bb..ae237407672 100644
--- a/gcc/tree-vect-data-refs.cc
+++ b/gcc/tree-vect-data-refs.cc
@@ -2290,8 +2290,11 @@ vect_enhance_data_refs_alignment (loop_vec_info
loop_vinfo)
if (unlimited_cost_model (LOOP_VINFO_LOOP (loop_vinfo)))
{
poly_uint64 vf = LOOP_VINFO_VECT_FACTOR (loop_vinfo);
- nscalars = (STMT_SLP_TYPE (stmt_info)
- ? vf * DR_GROUP_SIZE (stmt_info) : vf);
+ unsigned group_size = 1;
+ if (STMT_SLP_TYPE (stmt_info)
+ && STMT_VINFO_GROUPED_ACCESS (stmt_info))
+ group_size = DR_GROUP_SIZE (stmt_info);
+ nscalars = vf * group_size;
}
/* Save info about DR in the hash table. Also include peeling
--
2.35.3
