https://gcc.gnu.org/g:3507ab1b018a68500e49fa9f1de7caa0f1b53dda
commit r15-773-g3507ab1b018a68500e49fa9f1de7caa0f1b53dda
Author: Richard Biener <rguent...@suse.de>
Date: Tue May 21 19:15:33 2024 +0200
Fix mixed input kind permute optimization
When change_vec_perm_layout runs into a permute combining two
nodes where one is invariant and one internal the partition of
one input can be -1 but the other might not be. The following
supports this case by simply ignoring inputs with input partiton -1.
I'm not sure this is correct but it avoids ICEing when accessing
that partitions layout for gcc.target/i386/pr98928.c with the
change to avoid splitting store dataref groups during SLP discovery.
* tree-vect-slp.cc (change_vec_perm_layout): Ignore an
input partition of -1.
Diff:
---
gcc/tree-vect-slp.cc | 2 ++
1 file changed, 2 insertions(+)
diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc
index 43f2c153bf0..3f8209b43a7 100644
--- a/gcc/tree-vect-slp.cc
+++ b/gcc/tree-vect-slp.cc
@@ -4640,6 +4640,8 @@ change_vec_perm_layout (slp_tree node, lane_permutation_t
&perm,
{
slp_tree in_node = SLP_TREE_CHILDREN (node)[entry.first];
unsigned int in_partition_i = m_vertices[in_node->vertex].partition;
+ if (in_partition_i == -1u)
+ continue;
this_in_layout_i = m_partitions[in_partition_i].layout;
}
if (this_in_layout_i > 0)
