[gcc(refs/vendors/riscv/heads/gcc-14-with-riscv-opts)] Fix mixed input kind permute optimization

[Jeff Law via Gcc-cvs]

https://gcc.gnu.org/g:ad83da212ba5a5e27484fe7a147a28294fab8829

commit ad83da212ba5a5e27484fe7a147a28294fab8829
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.
    
    (cherry picked from commit 3507ab1b018a68500e49fa9f1de7caa0f1b53dda)

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 f23a04560ff..2dbef5e7dc7 100644
--- a/gcc/tree-vect-slp.cc
+++ b/gcc/tree-vect-slp.cc
@@ -4727,6 +4727,8 @@ 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)