[SLP]Do not reorder split node operand with reuses, if not possible

Need to check if the operand node of the split vectorize node has reuses
and check if it is possible to build the order for this node to reorder
it correctly.

Fixes #135912

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
index f9acc27..f973861 100644
--- a/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -7479,8 +7479,8 @@ void BoUpSLP::reorderBottomToTop(bool IgnoreReorder) {
         for (const auto &P : Data.first->CombinedEntriesWithIndices) {
           TreeEntry &OpTE = *VectorizableTree[P.first].get();
           OrdersType Order = OpTE.ReorderIndices;
-          if (Order.empty()) {
-            if (!OpTE.isGather())
+          if (Order.empty() || !OpTE.ReuseShuffleIndices.empty()) {
+            if (!OpTE.isGather() && OpTE.ReuseShuffleIndices.empty())
               continue;
             const auto BestOrder =
                 getReorderingData(OpTE, /*TopToBottom=*/false, IgnoreReorder);